mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-26 07:33:47 +00:00
3000 lines
114 KiB
EmacsLisp
3000 lines
114 KiB
EmacsLisp
;;; emerge.el --- merge diffs under Emacs control
|
||
|
||
;;; The author has placed this file in the public domain.
|
||
|
||
;; Author: Dale R. Worley <drw@math.mit.edu>
|
||
;; Version: 4
|
||
;; Keywords: unix, tools
|
||
|
||
;;; Commentary:
|
||
|
||
;; This package assists you in reconciling differences between pair of files.
|
||
|
||
; - Starting
|
||
;
|
||
; To start Emerge, you must run one of four commands:
|
||
;
|
||
; emerge-files
|
||
; emerge-files-with-ancestor
|
||
; emerge-buffers
|
||
; emerge-buffers-with-ancestor
|
||
;
|
||
; The "files" versions prompt you for two file names (the "A" and "B"
|
||
; files), the "buffers" versions prompt you for two buffer names (the
|
||
; "A" and "B" buffers). Emerge then runs a "diff" of the two entities
|
||
; (emerge-buffers writes the buffers into temporary files for input to
|
||
; diff) and digests the output to form a list of the differences between
|
||
; the two files. Then three buffers are set up: two containing the
|
||
; entities (emerge-files does a find-file (C-x C-f) on the files to get
|
||
; them into buffers), and one, the "merge buffer", which contains the
|
||
; working copy of the merged file that you are constructing. The three
|
||
; buffers are put up in a nice three-window display, showing the A and B
|
||
; buffers in the upper half and the merge buffer in the lower half.
|
||
;
|
||
; The versions of the command that say "with-ancestor" ask for a third
|
||
; name, that of an entity which is a common ancestor from which the
|
||
; versions being merged were derived. These commands use "diff3" to
|
||
; compare all three versions. If one version of a difference agrees
|
||
; with the ancestor, then it is presumed that the other version is the
|
||
; "correct" version, and is said to be "preferred".
|
||
;
|
||
; (Note that if you use emerge-files, Emerge attempts to make sure that
|
||
; file on disk and the file in the buffer are the same. If the file on
|
||
; disk has been changed, Emerge offers to revert the buffer. If the
|
||
; buffer has been modified, Emerge offers to save the buffer. If the
|
||
; user declines the offer, or if the file on disk and the buffer have
|
||
; both been modified, Emerge aborts with an error message. Emerge is
|
||
; careful to widen the buffers containing the files if they have been
|
||
; narrowed. If you use emerge-buffers, the buffers are not widened --
|
||
; only the visible portion is used.)
|
||
;
|
||
; During the merge, the A and B buffers are read-only, so you don't
|
||
; damage them. (This is because the A and B versions of the differences
|
||
; are extracted from these buffers.) When you quit the merge, the
|
||
; read-only/read-write status and modified flag on the A and B buffers
|
||
; are restored. In addition, auto-saving of the A and B buffers is
|
||
; suppressed during the merge. This is because Emerge modifies the A
|
||
; and B buffers to point out the text of the differences, and it would
|
||
; be useless to save these changes. (Just before suppressing
|
||
; auto-saving, Emerge forces an auto-save.)
|
||
;
|
||
; If you give a prefix argument to emerge-files or
|
||
; emerge-files-with-ancestor, it prompts you for another file name,
|
||
; which is the file into which the merged file is to be written when you
|
||
; exit Emerge. The output file name defaults to the A file name. If
|
||
; you successfully quit Emerge, the merge buffer will be written to the
|
||
; output file, and the buffers for the A, B, and ancestor buffers will
|
||
; be deleted (if they exist and are not modified). If you abort Emerge,
|
||
; the merge buffer will not be written and the buffers will not be
|
||
; deleted.
|
||
;
|
||
; You can have any number of merges going at once -- just don't use any
|
||
; one buffer as input to more than one merge at once, since that will
|
||
; cause the read-only/modified/auto-save status save-and-restore to
|
||
; screw up.
|
||
;
|
||
; Beware that when Emerge starts up, it does a diff or diff3 of the
|
||
; files, which can take many minutes for long files with many
|
||
; differences. Emacs can't do anything else until diff finishes.
|
||
;
|
||
; If diff or diff3 produces error messages, Emerge will beep and display
|
||
; the error messages instead of the merge buffer. There will be a
|
||
; message in the echo area giving the name of the merge buffer. Note
|
||
; that this is really just an informational message -- you still have
|
||
; switch to the merge buffer and abort the merge to restore the
|
||
; conditions before you ran Emerge. (Emerge considers any output line
|
||
; that does not match the regexp emerge-diff/diff3-ok-lines to be an
|
||
; error message.)
|
||
;
|
||
; After the merge has been set up, Emerge runs the hooks in
|
||
; emerge-startup-hook.
|
||
;
|
||
; - Merging
|
||
;
|
||
; Once you have started the merge, you manipulate the merge buffer with
|
||
; special commands issued in the merge buffer. You may also edit the
|
||
; buffer with ordinary Emacs commands. Emerge keeps track of each
|
||
; difference between the A and B buffers and the corresponding section
|
||
; of the merge buffer. Initially, all differences show the A version,
|
||
; except those for which B is preferred (because A agrees with the
|
||
; ancestor), which show the B version. Emerge always has its attention
|
||
; focused on one particular difference, which is marked off in the three
|
||
; buffers by "vvvvvvvvvvvvvvvvvvvv" above and "^^^^^^^^^^^^^^^^^^^^"
|
||
; below. The number of the difference is shown in the mode line.
|
||
;
|
||
; A merge buffer can be in two modes: "fast" mode and "edit" mode. In
|
||
; fast mode, emerge commands are single characters, and ordinary Emacs
|
||
; commands are disabled. This makes Emerge operations fast, but
|
||
; prevents you from doing more than selecing the A or the B version of
|
||
; differences. In edit mode, all emerge commands must be prefixed with
|
||
; C-c, and all (non-conflicting) Emacs commands are available. This
|
||
; allows editing the merge buffer, but slows down Emerge operations.
|
||
; Edit and fast modes are indicated by "F" and "E" in the minor modes in
|
||
; the mode line.
|
||
;
|
||
; The Emerge commands are:
|
||
;
|
||
; p go to the previous difference
|
||
; n go to the next difference
|
||
; a select the A version of this difference
|
||
; b select the B version of this difference
|
||
; j go to a particular difference (prefix argument
|
||
; specifies which difference) (0j suppresses display of
|
||
; the flags)
|
||
; q quit - finish the merge*
|
||
; f go into fast mode
|
||
; e go into edit mode
|
||
; s a set/clear auto-advance mode*
|
||
; s s set/clear skip-prefers mode*
|
||
; l recenter (C-l) all three windows*
|
||
; - and 0 through 9
|
||
; prefix numeric arguments
|
||
; d a select the A version as the default from here down in
|
||
; the merge buffer*
|
||
; d b select the B version as the default from here down in
|
||
; the merge buffer*
|
||
; c a copy the A version of the difference into the kill
|
||
; ring
|
||
; c b copy the B version of the difference into the kill
|
||
; ring
|
||
; i a insert the A version of the difference at the point
|
||
; i b insert the B version of the difference at the point
|
||
; m put the point and mark around the difference region
|
||
; ^ scroll-down (like M-v) the three windows*
|
||
; v scroll-up (like C-v) the three windows*
|
||
; < scroll-left (like C-x <) the three windows*
|
||
; > scroll-right (like C-x >) the three windows*
|
||
; | reset horizontal scroll on the three windows*
|
||
; x 1 shrink the merge window to one line (use C-u l to restore it
|
||
; to full size)
|
||
; x a find the difference containing a location in the A buffer*
|
||
; x b find the difference containing a location in the B buffer*
|
||
; x c combine the two versions of this difference*
|
||
; x C combine the two versions of this difference, using a
|
||
; register's value as the template*
|
||
; x d find the difference containing a location in the merge buffer*
|
||
; x f show the files/buffers Emerge is operating on in Help window
|
||
; (use C-u l to restore windows)
|
||
; x j join this difference with the following one
|
||
; (C-u x j joins this difference with the previous one)
|
||
; x l show line numbers of points in A, B, and merge buffers
|
||
; x m change major mode of merge buffer*
|
||
; x s split this difference into two differences
|
||
; (first position the point in all three buffers to the places
|
||
; to split the difference)
|
||
; x t trim identical lines off top and bottom of difference
|
||
; (such lines occur when the A and B versions are
|
||
; identical but differ from the ancestor version)
|
||
; x x set the template for the x c command*
|
||
;
|
||
; * - more details on these commands are given below
|
||
;
|
||
; emerge-version is a variable giving the version number of Emerge. It
|
||
; is also a function which displays emerge-version (when called
|
||
; interactively) or returns it (when called from a program).
|
||
;
|
||
; - Differences and their states
|
||
;
|
||
; A difference can have one of seven states:
|
||
;
|
||
; A: the difference is showing the A version.
|
||
;
|
||
; B: the difference is showing the B version.
|
||
;
|
||
; default-A and default-B: the difference is showing the A or B state,
|
||
; but has never been selected by the user. All differences start in the
|
||
; default-A state (and thus the merge buffer is a copy of the A buffer),
|
||
; except those for which one buffer or another is preferred. When the
|
||
; user selects the difference, it changes to the A or B state.
|
||
;
|
||
; prefer-A and prefer-B: the difference is showing the A or B state. In
|
||
; addition, the other buffer (that is, for prefer-A, the B buffer; for
|
||
; prefer-B, the A buffer) agrees with the ancestor buffer. Thus,
|
||
; presumably, the displayed version is the correct one. The "a" and "b"
|
||
; commands override these states, and turn them into the A and B states.
|
||
;
|
||
; combined: the difference is showing a combination of the A and B
|
||
; states that was constructed by the "x c" or "x C" commands. Since
|
||
; this state is neither the A or B states, the "a" and "b" commands
|
||
; won't alter the difference unless they are given a prefix argument.
|
||
;
|
||
; The state of the currently selected difference is shown in the mode
|
||
; line of the merge window:
|
||
;
|
||
; state display
|
||
;
|
||
; A A
|
||
; B B
|
||
; prefer-A A*
|
||
; prefer-B B*
|
||
; combined comb
|
||
;
|
||
; - Select default commands (d a and d b)
|
||
;
|
||
; The d a and d b commands change all default-A's to default-B's (or
|
||
; vice-versa) from the selected difference on down to the end of the
|
||
; file to default-A or default-B, respectively. (Since a difference
|
||
; that has been selected can not have state default-A or default-B, it
|
||
; will never be affected by d a or d b. This leads to the unexpected
|
||
; result that d a or d b never affects the difference selected at the
|
||
; moment, but prevents differences that you have already looked at from
|
||
; changing unexpectedly.)
|
||
;
|
||
; If you work your way down from the top of the file, using d a and d b
|
||
; at judicious points, you can effectivly make the A version the default
|
||
; for some sections of the merge buffer and the B version the default
|
||
; for others.
|
||
;
|
||
; - Exiting (q)
|
||
;
|
||
; The quit command finishes the merge session by restoring the state of
|
||
; the A and B buffers and removing the markers around the currently
|
||
; selected difference. It also disables the Emerge commands in the
|
||
; merge buffer, since executing them later could damage the contents of
|
||
; the various buffers.
|
||
;
|
||
; The action of "q" depends on how Emerge was started and whether "q"
|
||
; was given a prefix argument. If there was no prefix argument, it is
|
||
; considered a "successful" finish. If there was a prefix argument, it
|
||
; is considered an "unsuccessful" finish. In either case, you are asked
|
||
; to cofirm the exit, and the confirmation message tells which sort of
|
||
; exit you are confirming.
|
||
;
|
||
; If Emerge was started by some other process, success/failure is
|
||
; reported to the caller.
|
||
;
|
||
; If Emerge was started with emerge-files or emerge-files-with-ancestor,
|
||
; if a prefix argument was given to that command, then you specified a
|
||
; file into which the merge is to be written. A successful exit writes
|
||
; the merge into the output file and then kills the A, B, and ancestor
|
||
; buffers (so they aren't lying around to confuse you, since they
|
||
; probably all have similar names).
|
||
;
|
||
; - Auto-advance mode (s a)
|
||
;
|
||
; If auto-advance mode is set, the "a" and "b" commands perform an "n"
|
||
; (select next difference) afterward. When auto-advance mode is set,
|
||
; it is indicated by "A" in the minor modes in the mode line.
|
||
; "s a" with a positive argument sets auto-advance, with a non-positive
|
||
; argument clears it, and with no argument toggles it.
|
||
;
|
||
; - Skip-prefers mode (s s)
|
||
;
|
||
; If skip-prefers mode is set, the "n" and "p" commands skip over
|
||
; differences with states prefer-A and prefer-B. Thus you will only see
|
||
; differences for which one version isn't presumed "correct". When
|
||
; skip-prefers mode is set, it is indicated by "S" in the minor modes in
|
||
; the mode line. "s s" with a positive argument sets auto-advance, with
|
||
; a non-positive argument clears it, and with no argument toggles it.
|
||
;
|
||
; - Recenter (l)
|
||
;
|
||
; The Emerge "l" command causes the selected difference to be brought
|
||
; into view in the three windows, or at least, whichever of the three
|
||
; merge buffers are visible at the moment. If a prefix argument is
|
||
; given, then the original three-window display is set up before the
|
||
; difference texts are shown.
|
||
;
|
||
; - Scrolling the text (^, v, <, >, and |)
|
||
;
|
||
; Emerge has several commands which scroll all three windows by the same
|
||
; amount, thus allowing you to easily compare the versions of the text.
|
||
; The commands are "^" (scroll-up), "v" (scroll-down), "<"
|
||
; (scroll-left), ">" (scroll-right), and "|" (reset horizontal
|
||
; scrolling). (Remember that Emacs names scrolling commands by the
|
||
; motion of the text with respect to the window, so C-v is called
|
||
; "scroll-up".)
|
||
;
|
||
; If these commands (except "|") are given an argument, that is the
|
||
; number of lines or characters by which the windows are scrolled.
|
||
; Otherwise, the amount of motion is computed based on the dimensions of
|
||
; the merge buffer window -- the height of the merge buffer window
|
||
; (minus next-frame-context-lines), or half the width of the merge
|
||
; buffer window. (The A and B version windows are assumed to be as high
|
||
; as the merge window, but half as wide.) If the argument is just `C-u
|
||
; -', then the scrolling is half the default amount.
|
||
;
|
||
; - Finding the difference at or near a location (x d, x a, and x b)
|
||
;
|
||
; The "x d" command selects the difference containing the current point
|
||
; in the merge buffer. If there is no difference containing the point,
|
||
; an error is given. An argument can be given to the command to change
|
||
; this behavior: if the argument is positive (e.g., C-u), the next
|
||
; following difference is selected; if the argument is negative (e.g.,
|
||
; C-u -), the previous difference is selected.
|
||
;
|
||
; The "x a" and "x b" commands select the difference containing the
|
||
; current point in the A and B buffers, respectively. Otherwise, they
|
||
; act like the "x d" command. Note that although the point used in the
|
||
; commands is not the merge buffer point, the commands can only be
|
||
; issued in the merge buffer, because it is the only buffer with the
|
||
; Emerge keymap.
|
||
;
|
||
; - Combining the two versions (x c, x C, and x x)
|
||
;
|
||
; Sometimes one wants to combine the two versions of a difference. For
|
||
; instance, when merging two versions of a program, one wants to make
|
||
; something like this:
|
||
;
|
||
; #ifdef NEW
|
||
; ...new version of code...
|
||
; #else /* NEW */
|
||
; ...old version of code...
|
||
; #endif /* NEW */
|
||
;
|
||
; The "x c" command will make such a combined version. (Note that any
|
||
; combined version is not the same as either the A or B versions, and so
|
||
; the "a" and "b" commands will refuse to alter it unless they are given
|
||
; a prefix argument.) The combination is made under control of a
|
||
; template, which is a character string with the following
|
||
; interpolations:
|
||
;
|
||
; %a the A version of the difference
|
||
; %b the B version of the difference
|
||
; %% the character '%'
|
||
;
|
||
; Thus, the template used above is
|
||
;
|
||
; #ifdef NEW\n%b#else /* NEW */\n%a#endif /* NEW */\n
|
||
;
|
||
; (using \n here to represent newlines). The template is stored in the
|
||
; variable emerge-combine-versions-template, and its initial value is
|
||
; the one given above. The template can be set (from the current
|
||
; region) by the "x x" command. (Be careful to get the newlines in the
|
||
; template in the right places!) ("x x" was chosen by analogy with "C-x
|
||
; x".) ("x x" is only available in the merge buffer, of course.
|
||
; Elsewhere, M-x emerge-set-combine-versions-template can be used.) If
|
||
; "x x" is given a prefix argument, emerge-combine-versions-template is
|
||
; localized in the merge buffer before its value is set, so the "x x"
|
||
; command's effect (and the effect of any later "x x" command in the
|
||
; merge buffer) is only on the merge buffer.
|
||
;
|
||
; The "x C" command is like "x c", but it prompts for a character
|
||
; which is the register whose value is to be used as the template.
|
||
; This allows one to use multiple templates conveniently.
|
||
;
|
||
; - Changing the major mode of the edit buffer (x m)
|
||
;
|
||
; The "x m" command prompts for the name of a major-mode-setting command
|
||
; and executes it. Ordinarily, major-mode-setting commands change the
|
||
; mode line and local keymap, so the "x m" command then resets the
|
||
; Emerge mode line and the fast or edit mode local keymap, as
|
||
; appropriate.
|
||
;
|
||
; If you have already changed the major mode of the merge buffer and
|
||
; lost the Emerge keymap, you can use M-x emerge-set-merge-mode to
|
||
; execute this command.
|
||
;
|
||
; Beware that "x m" accepts any command name, not just
|
||
; major-mode-setting commands.
|
||
;
|
||
; - Writing the merge buffer manually
|
||
;
|
||
; Emerge places a wrapper (emerge-query-and-call) on the key bindings of
|
||
; save-buffer (usually "C-x C-s") and write-file (usually "C-x C-w"), in
|
||
; order to protect the user from writing out the merge before it is
|
||
; finished. Emerge-query-and-call asks the user if he is sure he wants
|
||
; to write out the incomplete merge. If he answers yes, the buffer is
|
||
; written out. The flags are suppressed while the write is being done.
|
||
; As a result of this, the displayed portions of the buffers are
|
||
; recentered (equivalent to "l").
|
||
;
|
||
; - Running Emerge standalone
|
||
;
|
||
; If you invoke emacs with the following arguments, you can execute
|
||
; Emerge as a standalone program:
|
||
;
|
||
; emacs -l emerge -f emerge-files-command file-a file-b file-out
|
||
;
|
||
; emacs -l emerge -f emerge-files-with-ancestor-command
|
||
; file-a file-b file-ancestor file-out
|
||
;
|
||
; When the user gives the "q" (quit) command, Emerge will write out the
|
||
; merge buffer in file-out and terminate Emacs. If a prefix argument is
|
||
; given, Emacs will terminate with an unsuccessful return code (1), if
|
||
; not, it will terminate with a successful return code (0).
|
||
;
|
||
; - Invoking Emerge remotely
|
||
;
|
||
; If you use the Emacs client/server code that supports remote
|
||
; execution, then you can invoke Emerge remotely by executing one of the
|
||
; Lisp calls:
|
||
;
|
||
; (emerge-files-remote "file A" "file B" "output file")
|
||
;
|
||
; (emerge-files-with-ancestor-remote "file A" "file B"
|
||
; "ancestor file" "output file")
|
||
;
|
||
; Returning a successful/unsuccessful return code is not yet supported
|
||
; by the Emacs client/server code.
|
||
;
|
||
; Beware that in systems of networked workstations, even though all user
|
||
; directories are shared between all the workstations, the /tmp
|
||
; directory on each workstation is not shared, so writing files into
|
||
; /tmp and then remotely invoking Emerge is not likely to work.
|
||
;
|
||
; - Effect of merge flags on indenting code
|
||
;
|
||
; The presence of the flags confuses the indentation code of C and
|
||
; Emacs-Lisp modes. Starting the flag strings
|
||
; (emerge-{before,after}-flag) with '#' (for C) or ';' (for Lisp)
|
||
; prevents the indentation code from noticing the flags. Remember to
|
||
; change the flag strings before loading Emerge, or to execute
|
||
; emerge-new-flags after changing them. But never change the flag
|
||
; strings while a merge is being performed.
|
||
;
|
||
; - Autoloading
|
||
;
|
||
; The following autoloads will make all top-level Emerge files
|
||
; autoloading. Make sure that "emerge" is in a directory on load-path.
|
||
;
|
||
; (autoload 'emerge-files "emerge"
|
||
; "Run Emerge on two files."
|
||
; t)
|
||
; (autoload 'emerge-files-with-ancestor "emerge"
|
||
; "Run Emerge on two files, giving another file as the ancestor."
|
||
; t)
|
||
; (autoload 'emerge-buffers "emerge"
|
||
; "Run Emerge on two buffers."
|
||
; t)
|
||
; (autoload 'emerge-buffers-with-ancestor "emerge"
|
||
; "Run Emerge on two buffers, giving another buffer as the ancestor."
|
||
; t)
|
||
; (autoload 'emerge-files-command "emerge")
|
||
; (autoload 'emerge-files-with-ancestor-command "emerge")
|
||
; (autoload 'emerge-files-remote "emerge")
|
||
; (autoload 'emerge-files-with-ancestor-remote "emerge")
|
||
;
|
||
; ================================================================
|
||
|
||
;;; Change Log:
|
||
|
||
; - Changes from version 3 to version 4
|
||
;
|
||
; More configuration variables are marked as user options.
|
||
;
|
||
; Code is included for an improved version of make-auto-save-file-name
|
||
; which eliminates many problems with the default version. See the
|
||
; documentation of emerge-make-auto-save-file-name to see how to
|
||
; activate it.
|
||
;
|
||
; Emerge now works with Gnu diff3, which can produce the groups of lines
|
||
; from the various files in the order 1, 2, 3 or 1, 3, 2.
|
||
;
|
||
; Added x f command to show what files or buffers are being operated on.
|
||
;
|
||
; The merge buffer now starts read-only, which being in fast mode it
|
||
; should be.
|
||
;
|
||
; When merging buffers, Emerge writes their contents into temporary
|
||
; files in the directory $TMPDIR (if it is defined), or /tmp by default.
|
||
;
|
||
; Added x j command to join two differences.
|
||
;
|
||
; Added x s command to split a difference into two differences.
|
||
;
|
||
; Added emerge-version variable and function to report the version of Emerge
|
||
; being run.
|
||
;
|
||
; Added x t command to trim unchanged lines off top and bottom of
|
||
; difference region.
|
||
;
|
||
; Added x d, x a, and x b commands to locate the differences at or near
|
||
; a given location in one of the buffers.
|
||
;
|
||
; Emerge no longer tries to copy the minor modes from the A buffer to
|
||
; the merge buffer, only the major mode.
|
||
;
|
||
; The programs executed to find the differences between versions of the file
|
||
; are no longer controlled by emerge-diff/diff3-command, but rather by:
|
||
; emerge-diff-program
|
||
; Variable: *Name of the program which compares two files.
|
||
; emerge-diff3-program
|
||
; Variable: *Name of the program which compares an ancestor file
|
||
; (first argument) and two variant files (second and third arguments).
|
||
; emerge-diff-options
|
||
; Variable: *Options to be passed to emerge-diff/diff3-program.
|
||
;
|
||
; The names of the files are expanded (see expand-file-name) before being
|
||
; passed to emerge-diff/diff3-program, so diff need not invoked under a shell
|
||
; that understands '~', for instance.
|
||
;
|
||
; If the diff/diff3 program reports errors, the user is notified and the
|
||
; errors are displayed.
|
||
;
|
||
; The command "0j" can be used to suppress the flags from showing in the buffers.
|
||
;
|
||
; A discussion of the effect of the merge flags on indentation of code
|
||
; has been added to the documentation.
|
||
;
|
||
; If kill-fix.el is loaded, Emerge control variables new have their
|
||
; 'preserved' property set, so setting the major mode in the merge
|
||
; buffer doesn't destroy Emerge's state.
|
||
;
|
||
; Added x c, x C, and x x commands to allow the A and B versions to be
|
||
; combined into #ifdef - #endif forms.
|
||
;
|
||
; Replaced calls of "ding" to calls of "error" where appropriate.
|
||
;
|
||
; Added x m command to allow major mode of merge buffer to be changed.
|
||
;
|
||
; Added x 1 command to shrink the merge window to one line.
|
||
;
|
||
; Added emerge-startup-hook to allow customization.
|
||
;
|
||
; Fixed a bug that is activated when a remote merge request is made when
|
||
; the minibuffer window is selected.
|
||
;
|
||
; - Changes from version 2 to version 3
|
||
;
|
||
; The directory into which temporary files are written is now controlled
|
||
; by a user option (emerge-temp-file-prefix).
|
||
;
|
||
; The A and B versions of the difference can be loaded into the kill
|
||
; ring with the "c a" and "c b" commands.
|
||
;
|
||
; The A and B versions of the difference can be inserted into the merge
|
||
; buffer with the "i a" and "i b" commands.
|
||
;
|
||
; The difference region of the merge buffer can be surrounded by the
|
||
; point and mark with the "m" command.
|
||
;
|
||
; The three windows can be scrolled together with the "^", "v", "<",
|
||
; ">", and "|" commands.
|
||
;
|
||
; The "s s" and "s a" commands report the state of the option in the
|
||
; echo area. Similarly, the "f" and "e" commands report what they do in
|
||
; the echo area.
|
||
;
|
||
; The "q" command has been revamped, and its behavior is now controlled
|
||
; by the manner in which Emerge is started. In particular, if you wish
|
||
; to write the merge buffer into a file upon exiting, invoke
|
||
; emerge-files[-with-ancestor] with a prefix argument, and it will
|
||
; prompt you for the file name. Then exiting will write the merge
|
||
; buffer to the file, unless "q" is given a prefix argument.
|
||
;
|
||
; The "i a" and "i b" commands now work in fast mode.
|
||
;
|
||
; The modifications that Emerge makes to save-buffer and write-file are
|
||
; described.
|
||
;
|
||
; Emerge now handles merging narrowed buffers correctly.
|
||
;
|
||
; Emerge now isn't fooled when the buffer visiting a file is not the
|
||
; same as the file on disk.
|
||
|
||
;;; Code:
|
||
|
||
;;; Macros
|
||
|
||
(defmacro emerge-eval-in-buffer (buffer &rest forms)
|
||
"Macro to switch to BUFFER, evaluate FORMS, returns to original buffer.
|
||
Differs from `save-excursion' in that it doesn't save the point and mark."
|
||
(` (let ((StartBuffer (current-buffer)))
|
||
(unwind-protect
|
||
(progn
|
||
(set-buffer (, buffer))
|
||
(,@ forms))
|
||
(set-buffer StartBuffer)))))
|
||
|
||
(defmacro emerge-defvar-local (var value doc)
|
||
"Defines SYMBOL as an advertised variable.
|
||
Performs a defvar, then executes `make-variable-buffer-local' on
|
||
the variable. Also sets the 'preserved' property, so that
|
||
`kill-all-local-variables' (called by major-mode setting commands)
|
||
won't destroy Emerge control variables."
|
||
(` (progn
|
||
(defvar (, var) (, value) (, doc))
|
||
(make-variable-buffer-local '(, var))
|
||
(put '(, var) 'preserved t))))
|
||
|
||
;; Add entries to minor-mode-alist so that emerge modes show correctly
|
||
(setq emerge-minor-modes-list '((emerge-mode " Emerge")
|
||
(emerge-fast-mode " F")
|
||
(emerge-edit-mode " E")
|
||
(emerge-auto-advance " A")
|
||
(emerge-skip-prefers " S")))
|
||
(if (not (assq 'emerge-mode minor-mode-alist))
|
||
(setq minor-mode-alist (append emerge-minor-modes-list
|
||
minor-mode-alist)))
|
||
|
||
;; We need to define this function so describe-mode can describe Emerge mode.
|
||
(defun emerge-mode ()
|
||
"Emerge mode is used by the Emerge file-merging package.
|
||
It is entered only through one of the functions:
|
||
`emerge-files'
|
||
`emerge-files-with-ancestor'
|
||
`emerge-buffers'
|
||
`emerge-buffers-with-ancestor'
|
||
`emerge-files-command'
|
||
`emerge-files-with-ancestor-command'
|
||
`emerge-files-remote'
|
||
`emerge-files-with-ancestor-remote'
|
||
|
||
Commands:
|
||
\\{emerge-basic-keymap}
|
||
Commands must be prefixed by \\<emerge-fast-keymap>\\[emerge-basic-keymap] in 'edit' mode, but can be invoked directly
|
||
in 'fast' mode.")
|
||
|
||
(defvar emerge-version "4"
|
||
"The version of Emerge.")
|
||
|
||
(defun emerge-version ()
|
||
"Return string describing the version of Emerge.
|
||
When called interactively, displays the version."
|
||
(interactive)
|
||
(if (interactive-p)
|
||
(message "Emerge version %s" (emerge-version))
|
||
emerge-version))
|
||
|
||
;;; Emerge configuration variables
|
||
|
||
;; Commands that produce difference files
|
||
;; All that can be configured is the name of the programs to execute
|
||
;; (emerge-diff-program and emerge-diff3-program) and the options
|
||
;; to be provided (emerge-diff-options). The order in which the file names
|
||
;; are given is fixed.
|
||
;; The file names are always expanded (see expand-file-name) before being
|
||
;; passed to diff, thus they need not be invoked under a shell that
|
||
;; understands '~'.
|
||
;; The code which processes the diff/diff3 output depends on all the
|
||
;; finicky details of their output, including the somewhat strange
|
||
;; way they number lines of a file.
|
||
(defvar emerge-diff-program "diff"
|
||
"*Name of the program which compares two files.")
|
||
(defvar emerge-diff3-program "diff3"
|
||
"*Name of the program which compares an ancestor file (first argument)
|
||
and two variant files (second and third arguments).")
|
||
(defvar emerge-diff-options ""
|
||
"*Options to be passed to emerge-diff/diff3-program.")
|
||
(defvar emerge-match-diff-line (let ((x "\\([0-9]+\\)\\(\\|,\\([0-9]+\\)\\)"))
|
||
(concat "^" x "\\([acd]\\)" x "$"))
|
||
"*Pattern to match lines produced by diff that describe differences (as
|
||
opposed to lines from the source files).")
|
||
(defvar emerge-diff-ok-lines
|
||
"^\\([0-9,]+[acd][0-9,]+$\\|[<>] \\|---\\)"
|
||
"*Regexp that matches normal output lines from emerge-diff-program .
|
||
Lines that do not match are assumed to be error output.")
|
||
(defvar emerge-diff3-ok-lines
|
||
"^\\([1-3]:\\|====\\| \\)"
|
||
"*Regexp that matches normal output lines from emerge-diff3-program .
|
||
Lines that do not match are assumed to be error output.")
|
||
|
||
;; The flags used to mark differences in the buffers.
|
||
|
||
;; These function definitions need to be up here, because they are used
|
||
;; during loading.
|
||
(defun emerge-new-flags ()
|
||
"Function to be called after `emerge-{before,after}-flag'.
|
||
This is called after these functions are changed to compute values that
|
||
depend on the flags."
|
||
(setq emerge-before-flag-length (length emerge-before-flag))
|
||
(setq emerge-before-flag-lines
|
||
(count-matches-string emerge-before-flag "\n"))
|
||
(setq emerge-before-flag-match (regexp-quote emerge-before-flag))
|
||
(setq emerge-after-flag-length (length emerge-after-flag))
|
||
(setq emerge-after-flag-lines
|
||
(count-matches-string emerge-after-flag "\n"))
|
||
(setq emerge-after-flag-match (regexp-quote emerge-after-flag)))
|
||
(defun count-matches-string (string regexp)
|
||
"Return the number of matches in STRING for REGEXP."
|
||
(let ((i 0)
|
||
(count 0))
|
||
(while (string-match regexp string i)
|
||
(setq count (1+ count))
|
||
(setq i (match-end 0)))
|
||
count))
|
||
|
||
(defvar emerge-before-flag "vvvvvvvvvvvvvvvvvvvv\n"
|
||
"*Flag placed above the highlighted block of code. Must end with newline.
|
||
Must be set before Emerge is loaded, or emerge-new-flags must be run
|
||
after setting.")
|
||
(defvar emerge-after-flag "^^^^^^^^^^^^^^^^^^^^\n"
|
||
"*Flag placed below the highlighted block of code. Must end with newline.
|
||
Must be set before Emerge is loaded, or emerge-new-flags must be run
|
||
after setting.")
|
||
|
||
;; Calculate dependent variables
|
||
(emerge-new-flags)
|
||
|
||
(defvar emerge-min-visible-lines 3
|
||
"*Number of lines that we want to show above and below the flags when we are
|
||
displaying a difference.")
|
||
|
||
(defvar emerge-temp-file-prefix
|
||
(let ((env (getenv "TMPDIR"))
|
||
d)
|
||
(setq d (if (and env (> (length env) 0))
|
||
env
|
||
"/tmp"))
|
||
(if (= (aref d (1- (length d))) ?/)
|
||
(setq d (substring d 0 -1)))
|
||
(concat d "/emerge"))
|
||
"*Prefix to put on Emerge temporary file names.
|
||
Do not start with '~/' or '~user-name/'.")
|
||
|
||
(defvar emerge-temp-file-mode 384 ; u=rw only
|
||
"*Mode for Emerge temporary files.")
|
||
|
||
(defvar emerge-combine-versions-template
|
||
"#ifdef NEW\n%b#else /* NEW */\n%a#endif /* NEW */\n"
|
||
"*Template for emerge-combine-versions to combine the two versions.
|
||
The template is inserted as a string, with the following interpolations:
|
||
%a the A version of the difference
|
||
%b the B version of the difference
|
||
%% the character '%'
|
||
Don't forget to end the template with a newline.
|
||
Note that this variable can be made local to a particular merge buffer by
|
||
giving a prefix argument to emerge-set-combine-versions-template .")
|
||
|
||
;; Build keymaps
|
||
|
||
(defvar emerge-basic-keymap nil
|
||
"Keymap of Emerge commands.
|
||
Directly available in 'fast' mode;
|
||
must be prefixed by \\<emerge-fast-keymap>\\[emerge-basic-keymap] in 'edit' mode.")
|
||
|
||
(defvar emerge-fast-keymap nil
|
||
"Local keymap used in Emerge 'fast' mode.
|
||
Makes Emerge commands directly available.")
|
||
|
||
(defvar emerge-command-prefix "\C-c"
|
||
"*Command prefix for Emerge commands in 'edit' mode.
|
||
Must be set before Emerge is loaded.")
|
||
|
||
;; This function sets up the fixed keymaps. It is executed when the first
|
||
;; Emerge is done to allow the user maximum time to set up the global keymap.
|
||
(defun emerge-setup-fixed-keymaps ()
|
||
;; Set up the basic keymap
|
||
(setq emerge-basic-keymap (make-keymap))
|
||
(suppress-keymap emerge-basic-keymap) ; this sets 0..9 to digit-argument and
|
||
; - to negative-argument
|
||
(define-key emerge-basic-keymap "p" 'emerge-previous-difference)
|
||
(define-key emerge-basic-keymap "n" 'emerge-next-difference)
|
||
(define-key emerge-basic-keymap "a" 'emerge-select-A)
|
||
(define-key emerge-basic-keymap "b" 'emerge-select-B)
|
||
(define-key emerge-basic-keymap "j" 'emerge-jump-to-difference)
|
||
(define-key emerge-basic-keymap "q" 'emerge-quit)
|
||
(define-key emerge-basic-keymap "f" 'emerge-fast-mode)
|
||
(define-key emerge-basic-keymap "e" 'emerge-edit-mode)
|
||
(define-key emerge-basic-keymap "s" nil)
|
||
(define-key emerge-basic-keymap "sa" 'emerge-auto-advance)
|
||
(define-key emerge-basic-keymap "ss" 'emerge-skip-prefers)
|
||
(define-key emerge-basic-keymap "l" 'emerge-recenter)
|
||
(define-key emerge-basic-keymap "d" nil)
|
||
(define-key emerge-basic-keymap "da" 'emerge-default-A)
|
||
(define-key emerge-basic-keymap "db" 'emerge-default-B)
|
||
(define-key emerge-basic-keymap "c" nil)
|
||
(define-key emerge-basic-keymap "ca" 'emerge-copy-as-kill-A)
|
||
(define-key emerge-basic-keymap "cb" 'emerge-copy-as-kill-B)
|
||
(define-key emerge-basic-keymap "i" nil)
|
||
(define-key emerge-basic-keymap "ia" 'emerge-insert-A)
|
||
(define-key emerge-basic-keymap "ib" 'emerge-insert-B)
|
||
(define-key emerge-basic-keymap "m" 'emerge-mark-difference)
|
||
(define-key emerge-basic-keymap "v" 'emerge-scroll-up)
|
||
(define-key emerge-basic-keymap "^" 'emerge-scroll-down)
|
||
(define-key emerge-basic-keymap "<" 'emerge-scroll-left)
|
||
(define-key emerge-basic-keymap ">" 'emerge-scroll-right)
|
||
(define-key emerge-basic-keymap "|" 'emerge-scroll-reset)
|
||
(define-key emerge-basic-keymap "x" nil)
|
||
(define-key emerge-basic-keymap "x1" 'emerge-one-line-window)
|
||
(define-key emerge-basic-keymap "xa" 'emerge-find-difference-A)
|
||
(define-key emerge-basic-keymap "xb" 'emerge-find-difference-B)
|
||
(define-key emerge-basic-keymap "xc" 'emerge-combine-versions)
|
||
(define-key emerge-basic-keymap "xC" 'emerge-combine-versions-register)
|
||
(define-key emerge-basic-keymap "xd" 'emerge-find-difference)
|
||
(define-key emerge-basic-keymap "xf" 'emerge-file-names)
|
||
(define-key emerge-basic-keymap "xj" 'emerge-join-differences)
|
||
(define-key emerge-basic-keymap "xl" 'emerge-line-numbers)
|
||
(define-key emerge-basic-keymap "xm" 'emerge-set-merge-mode)
|
||
(define-key emerge-basic-keymap "xs" 'emerge-split-difference)
|
||
(define-key emerge-basic-keymap "xt" 'emerge-trim-difference)
|
||
(define-key emerge-basic-keymap "xx" 'emerge-set-combine-versions-template)
|
||
;; Allow emerge-basic-keymap to be referenced indirectly
|
||
(fset 'emerge-basic-keymap emerge-basic-keymap)
|
||
;; Set up the fast mode keymap
|
||
(setq emerge-fast-keymap (copy-keymap emerge-basic-keymap))
|
||
;; Allow prefixed commands to work in fast mode
|
||
(define-key emerge-fast-keymap emerge-command-prefix 'emerge-basic-keymap)
|
||
;; Allow emerge-fast-keymap to be referenced indirectly
|
||
(fset 'emerge-fast-keymap emerge-fast-keymap)
|
||
;; Suppress write-file and save-buffer
|
||
(emerge-shadow-key-definition 'write-file 'emerge-query-write-file
|
||
(current-global-map) emerge-fast-keymap)
|
||
(emerge-shadow-key-definition 'save-buffer 'emerge-query-save-buffer
|
||
(current-global-map) emerge-fast-keymap))
|
||
|
||
;; Variables which control each merge. They are local to the merge buffer.
|
||
|
||
;; Mode variables
|
||
(emerge-defvar-local emerge-mode nil
|
||
"Indicator for emerge-mode.")
|
||
(emerge-defvar-local emerge-fast-mode nil
|
||
"Indicator for emerge-mode fast submode.")
|
||
(emerge-defvar-local emerge-edit-mode nil
|
||
"Indicator for emerge-mode edit submode.")
|
||
(emerge-defvar-local emerge-A-buffer nil
|
||
"The buffer in which the A variant is stored.")
|
||
(emerge-defvar-local emerge-B-buffer nil
|
||
"The buffer in which the B variant is stored.")
|
||
(emerge-defvar-local emerge-merge-buffer nil
|
||
"The buffer in which the merged file is manipulated.")
|
||
(emerge-defvar-local emerge-ancestor-buffer nil
|
||
"The buffer in which the ancestor variant is stored,
|
||
or nil if there is none.")
|
||
|
||
(defconst emerge-saved-variables
|
||
'((buffer-modified-p set-buffer-modified-p)
|
||
buffer-read-only
|
||
buffer-auto-save-file-name)
|
||
"Variables and properties of a buffer which are saved, modified and restored
|
||
during a merge.")
|
||
(defconst emerge-merging-values '(nil t nil)
|
||
"Values to be assigned to emerge-saved-variables during a merge.")
|
||
|
||
(emerge-defvar-local emerge-A-buffer-values nil
|
||
"Remembers emerge-saved-variables for emerge-A-buffer.")
|
||
(emerge-defvar-local emerge-B-buffer-values nil
|
||
"Remembers emerge-saved-variables for emerge-B-buffer.")
|
||
|
||
(emerge-defvar-local emerge-difference-list nil
|
||
"Vector of differences between the variants, and markers in the buffers to
|
||
show where they are. Each difference is represented by a vector of seven
|
||
elements. The first two are markers to the beginning and end of the difference
|
||
section in the A buffer, the second two are markers for the B buffer, the third
|
||
two are markers for the merge buffer, and the last element is the \"state\" of
|
||
that difference in the merge buffer.
|
||
A section of a buffer is described by two markers, one to the beginning of
|
||
the first line of the section, and one to the beginning of the first line
|
||
after the section. (If the section is empty, both markers point to the same
|
||
point.) If the section is part of the selected difference, then the markers
|
||
are moved into the flags, so the user can edit the section without disturbing
|
||
the markers.
|
||
The \"states\" are:
|
||
A the merge buffer currently contains the A variant
|
||
B the merge buffer currently contains the B variant
|
||
default-A the merge buffer contains the A variant by default,
|
||
but this difference hasn't been selected yet, so
|
||
change-default commands can alter it
|
||
default-B the merge buffer contains the B variant by default,
|
||
but this difference hasn't been selected yet, so
|
||
change-default commands can alter it
|
||
prefer-A in a three-file merge, the A variant is the prefered
|
||
choice
|
||
prefer-B in a three-file merge, the B variant is the prefered
|
||
choice")
|
||
(emerge-defvar-local emerge-current-difference -1
|
||
"The difference that is currently selected.")
|
||
(emerge-defvar-local emerge-number-of-differences nil
|
||
"Number of differences found.")
|
||
(emerge-defvar-local emerge-edit-keymap nil
|
||
"The local keymap for the merge buffer, with the emerge commands defined in
|
||
it. Used to save the local keymap during fast mode, when the local keymap is
|
||
replaced by emerge-fast-keymap.")
|
||
(emerge-defvar-local emerge-old-keymap nil
|
||
"The original local keymap for the merge buffer.")
|
||
(emerge-defvar-local emerge-auto-advance nil
|
||
"*If non-nil, emerge-select-A and emerge-select-B automatically advance to
|
||
the next difference.")
|
||
(emerge-defvar-local emerge-skip-prefers nil
|
||
"*If non-nil, differences for which there is a preference are automatically
|
||
skipped.")
|
||
(emerge-defvar-local emerge-startup-hook nil
|
||
"*Hooks to run in the merge buffer after the merge has been set up.")
|
||
(emerge-defvar-local emerge-quit-hook nil
|
||
"Hooks to run in the merge buffer after the merge has been finished.
|
||
emerge-prefix-argument will be bound to the prefix argument of the emerge-quit
|
||
command.
|
||
This is not a user option, since Emerge uses it for its own processing.")
|
||
(emerge-defvar-local emerge-output-description nil
|
||
"Describes output destination merge, for the use of `emerge-file-names'.")
|
||
|
||
;;; Setup functions for two-file mode.
|
||
|
||
(defun emerge-files-internal (file-A file-B &optional startup-hooks quit-hooks
|
||
output-file)
|
||
(let ((buffer-A (find-file-noselect file-A))
|
||
(buffer-B (find-file-noselect file-B)))
|
||
;; Make sure the entire files are seen, and they reflect what is on disk
|
||
(emerge-eval-in-buffer buffer-A
|
||
(widen)
|
||
(emerge-verify-file-buffer))
|
||
(emerge-eval-in-buffer buffer-B
|
||
(widen)
|
||
(emerge-verify-file-buffer))
|
||
(emerge-setup buffer-A file-A buffer-B file-B startup-hooks quit-hooks
|
||
output-file)))
|
||
|
||
;; Start up Emerge on two files
|
||
(defun emerge-setup (buffer-A file-A buffer-B file-B startup-hooks quit-hooks
|
||
output-file)
|
||
(setq file-A (expand-file-name file-A))
|
||
(setq file-B (expand-file-name file-B))
|
||
(setq output-file (and output-file (expand-file-name output-file)))
|
||
(let* ((merge-buffer-name (emerge-unique-buffer-name "*merge" "*"))
|
||
;; create the merge buffer from buffer A, so it inherits buffer A's
|
||
;; default directory, etc.
|
||
(merge-buffer (emerge-eval-in-buffer
|
||
buffer-A
|
||
(get-buffer-create merge-buffer-name))))
|
||
(emerge-eval-in-buffer
|
||
merge-buffer
|
||
(emerge-copy-modes buffer-A)
|
||
(setq buffer-read-only nil)
|
||
(auto-save-mode 1)
|
||
(setq emerge-mode t)
|
||
(setq emerge-A-buffer buffer-A)
|
||
(setq emerge-B-buffer buffer-B)
|
||
(setq emerge-ancestor-buffer nil)
|
||
(setq emerge-merge-buffer merge-buffer)
|
||
(setq emerge-output-description
|
||
(if output-file
|
||
(concat "Output to file: " output-file)
|
||
(concat "Output to buffer: " (buffer-name merge-buffer))))
|
||
(insert-buffer emerge-A-buffer)
|
||
(emerge-set-keys)
|
||
(setq emerge-difference-list (emerge-make-diff-list file-A file-B))
|
||
(setq emerge-number-of-differences (length emerge-difference-list))
|
||
(setq emerge-current-difference -1)
|
||
(setq emerge-quit-hooks quit-hooks)
|
||
(emerge-remember-buffer-characteristics))
|
||
(emerge-setup-windows buffer-A buffer-B merge-buffer t)
|
||
(emerge-eval-in-buffer merge-buffer
|
||
(run-hooks 'startup-hooks 'emerge-startup-hook)
|
||
(setq buffer-read-only t))))
|
||
|
||
;; Generate the Emerge difference list between two files
|
||
(defun emerge-make-diff-list (file-A file-B)
|
||
(setq emerge-diff-buffer (get-buffer-create "*emerge-diff*"))
|
||
(emerge-eval-in-buffer
|
||
emerge-diff-buffer
|
||
(erase-buffer)
|
||
(shell-command
|
||
(format "%s %s %s %s"
|
||
emerge-diff-program emerge-diff-options file-A file-B)
|
||
t))
|
||
(emerge-prepare-error-list emerge-diff-ok-lines)
|
||
(emerge-convert-diffs-to-markers
|
||
emerge-A-buffer emerge-B-buffer emerge-merge-buffer
|
||
(emerge-extract-diffs emerge-diff-buffer)))
|
||
|
||
(defun emerge-extract-diffs (diff-buffer)
|
||
(let (list)
|
||
(emerge-eval-in-buffer
|
||
diff-buffer
|
||
(goto-char (point-min))
|
||
(while (re-search-forward emerge-match-diff-line nil t)
|
||
(let* ((a-begin (string-to-int (buffer-substring (match-beginning 1)
|
||
(match-end 1))))
|
||
(a-end (let ((b (match-beginning 3))
|
||
(e (match-end 3)))
|
||
(if b
|
||
(string-to-int (buffer-substring b e))
|
||
a-begin)))
|
||
(diff-type (buffer-substring (match-beginning 4) (match-end 4)))
|
||
(b-begin (string-to-int (buffer-substring (match-beginning 5)
|
||
(match-end 5))))
|
||
(b-end (let ((b (match-beginning 7))
|
||
(e (match-end 7)))
|
||
(if b
|
||
(string-to-int (buffer-substring b e))
|
||
b-begin))))
|
||
;; fix the beginning and end numbers, because diff is somewhat
|
||
;; strange about how it numbers lines
|
||
(if (string-equal diff-type "a")
|
||
(progn
|
||
(setq b-end (1+ b-end))
|
||
(setq a-begin (1+ a-begin))
|
||
(setq a-end a-begin))
|
||
(if (string-equal diff-type "d")
|
||
(progn
|
||
(setq a-end (1+ a-end))
|
||
(setq b-begin (1+ b-begin))
|
||
(setq b-end b-begin))
|
||
;; (string-equal diff-type "c")
|
||
(progn
|
||
(setq a-end (1+ a-end))
|
||
(setq b-end (1+ b-end)))))
|
||
(setq list (cons (vector a-begin a-end
|
||
b-begin b-end
|
||
'default-A)
|
||
list)))))
|
||
(nreverse list)))
|
||
|
||
;; Set up buffer of diff/diff3 error messages.
|
||
(defun emerge-prepare-error-list (ok-regexp)
|
||
(setq emerge-diff-error-buffer (get-buffer-create "*emerge-diff-errors*"))
|
||
(emerge-eval-in-buffer
|
||
emerge-diff-error-buffer
|
||
(erase-buffer)
|
||
(insert-buffer emerge-diff-buffer)
|
||
(delete-matching-lines ok-regexp)))
|
||
|
||
;;; Top-level and setup functions for three-file mode.
|
||
|
||
(defun emerge-files-with-ancestor-internal (file-A file-B file-ancestor
|
||
&optional startup-hooks quit-hooks
|
||
output-file)
|
||
(let ((buffer-A (find-file-noselect file-A))
|
||
(buffer-B (find-file-noselect file-B))
|
||
(buffer-ancestor (find-file-noselect file-ancestor)))
|
||
;; Make sure the entire files are seen, and they reflect what is on disk
|
||
(emerge-eval-in-buffer buffer-A
|
||
(widen)
|
||
(emerge-verify-file-buffer))
|
||
(emerge-eval-in-buffer buffer-B
|
||
(widen)
|
||
(emerge-verify-file-buffer))
|
||
(emerge-eval-in-buffer buffer-ancestor
|
||
(widen)
|
||
(emerge-verify-file-buffer))
|
||
(emerge-setup-with-ancestor buffer-A file-A buffer-B file-B
|
||
buffer-ancestor file-ancestor
|
||
startup-hooks quit-hooks output-file)))
|
||
|
||
;; Start up Emerge on two files with an ancestor
|
||
(defun emerge-setup-with-ancestor (buffer-A file-A buffer-B file-B
|
||
buffer-ancestor file-ancestor
|
||
&optional startup-hooks quit-hooks
|
||
output-file)
|
||
(setq file-A (expand-file-name file-A))
|
||
(setq file-B (expand-file-name file-B))
|
||
(setq file-ancestor (expand-file-name file-ancestor))
|
||
(setq output-file (and output-file (expand-file-name output-file)))
|
||
(let* ((merge-buffer-name (emerge-unique-buffer-name "*merge" "*"))
|
||
;; create the merge buffer from buffer A, so it inherits buffer A's
|
||
;; default directory, etc.
|
||
(merge-buffer (emerge-eval-in-buffer
|
||
buffer-A
|
||
(get-buffer-create merge-buffer-name))))
|
||
(emerge-eval-in-buffer
|
||
merge-buffer
|
||
(emerge-copy-modes buffer-A)
|
||
(setq buffer-read-only nil)
|
||
(auto-save-mode 1)
|
||
(setq emerge-mode t)
|
||
(setq emerge-A-buffer buffer-A)
|
||
(setq emerge-B-buffer buffer-B)
|
||
(setq emerge-ancestor-buffer buffer-ancestor)
|
||
(setq emerge-merge-buffer merge-buffer)
|
||
(setq emerge-output-description
|
||
(if output-file
|
||
(concat "Output to file: " output-file)
|
||
(concat "Output to buffer: " (buffer-name merge-buffer))))
|
||
(insert-buffer emerge-A-buffer)
|
||
(emerge-set-keys)
|
||
(setq emerge-difference-list
|
||
(emerge-make-diff3-list file-A file-B file-ancestor))
|
||
(setq emerge-number-of-differences (length emerge-difference-list))
|
||
(setq emerge-current-difference -1)
|
||
(setq emerge-quit-hook quit-hooks)
|
||
(emerge-remember-buffer-characteristics)
|
||
(emerge-select-prefer-Bs))
|
||
(emerge-setup-windows buffer-A buffer-B merge-buffer t)
|
||
(emerge-eval-in-buffer merge-buffer
|
||
(run-hooks 'startup-hooks 'emerge-startup-hook)
|
||
(setq buffer-read-only t))))
|
||
|
||
;; Generate the Emerge difference list between two files with an ancestor
|
||
(defun emerge-make-diff3-list (file-A file-B file-ancestor)
|
||
(setq emerge-diff-buffer (get-buffer-create "*emerge-diff*"))
|
||
(emerge-eval-in-buffer
|
||
emerge-diff-buffer
|
||
(erase-buffer)
|
||
(shell-command
|
||
(format "%s %s %s %s %s"
|
||
emerge-diff3-program emerge-diff-options
|
||
file-ancestor file-A file-B)
|
||
t))
|
||
(emerge-prepare-error-list emerge-diff3-ok-lines)
|
||
(emerge-convert-diffs-to-markers
|
||
emerge-A-buffer emerge-B-buffer emerge-merge-buffer
|
||
(emerge-extract-diffs3 emerge-diff-buffer)))
|
||
|
||
(defun emerge-extract-diffs3 (diff-buffer)
|
||
(let (list)
|
||
(emerge-eval-in-buffer
|
||
diff-buffer
|
||
(while (re-search-forward "^====\\(.?\\)$" nil t)
|
||
;; leave point after matched line
|
||
(beginning-of-line 2)
|
||
(let ((agreement (buffer-substring (match-beginning 1) (match-end 1))))
|
||
;; if the A and B files are the same, ignore the difference
|
||
(if (not (string-equal agreement "1"))
|
||
(setq list
|
||
(cons
|
||
(let ((group-2 (emerge-get-diff3-group "2"))
|
||
(group-3 (emerge-get-diff3-group "3")))
|
||
(vector (car group-2) (car (cdr group-2))
|
||
(car group-3) (car (cdr group-3))
|
||
(cond ((string-equal agreement "2") 'prefer-A)
|
||
((string-equal agreement "3") 'prefer-B)
|
||
(t 'default-A))))
|
||
list))))))
|
||
(nreverse list)))
|
||
|
||
(defun emerge-get-diff3-group (file)
|
||
;; This save-excursion allows emerge-get-diff3-group to be called for the
|
||
;; various groups of lines (1, 2, 3) in any order, and for the lines to
|
||
;; appear in any order. The reason this is necessary is that Gnu diff3
|
||
;; can produce the groups in the order 1, 2, 3 or 1, 3, 2.
|
||
(save-excursion
|
||
(re-search-forward
|
||
(concat "^" file ":\\([0-9]+\\)\\(,\\([0-9]+\\)\\)?\\([ac]\\)$"))
|
||
(beginning-of-line 2)
|
||
;; treatment depends on whether it is an "a" group or a "c" group
|
||
(if (string-equal (buffer-substring (match-beginning 4) (match-end 4)) "c")
|
||
;; it is a "c" group
|
||
(if (match-beginning 2)
|
||
;; it has two numbers
|
||
(list (string-to-int
|
||
(buffer-substring (match-beginning 1) (match-end 1)))
|
||
(1+ (string-to-int
|
||
(buffer-substring (match-beginning 3) (match-end 3)))))
|
||
;; it has one number
|
||
(let ((x (string-to-int
|
||
(buffer-substring (match-beginning 1) (match-end 1)))))
|
||
(list x (1+ x))))
|
||
;; it is an "a" group
|
||
(let ((x (1+ (string-to-int
|
||
(buffer-substring (match-beginning 1) (match-end 1))))))
|
||
(list x x)))))
|
||
|
||
;;; Functions to start Emerge on files
|
||
|
||
;;;###autoload
|
||
(defun emerge-files (arg file-A file-B file-out &optional startup-hooks
|
||
quit-hooks)
|
||
"Run Emerge on two files."
|
||
(interactive
|
||
(let (f)
|
||
(list current-prefix-arg
|
||
(setq f (read-file-name "File A to merge: " nil nil 'confirm))
|
||
(read-file-name "File B to merge: " nil nil 'confirm)
|
||
(and current-prefix-arg
|
||
(read-file-name
|
||
(format "Output file: (default %s) " f)
|
||
nil f nil)))))
|
||
(emerge-files-internal
|
||
file-A file-B startup-hooks
|
||
(if arg
|
||
(cons (` (lambda () (emerge-files-exit (, file-out))))
|
||
quit-hooks)
|
||
quit-hooks)
|
||
file-out))
|
||
|
||
;;;###autoload
|
||
(defun emerge-files-with-ancestor (arg file-A file-B file-ancestor file-out
|
||
&optional startup-hooks quit-hooks)
|
||
"Run Emerge on two files, giving another file as the ancestor."
|
||
(interactive
|
||
(let (f)
|
||
(list current-prefix-arg
|
||
(setq f (read-file-name "File A to merge: " nil nil 'confirm))
|
||
(read-file-name "File B to merge: " nil nil 'confirm)
|
||
(read-file-name "Ancestor file: " nil nil 'confirm)
|
||
(and current-prefix-arg
|
||
(read-file-name
|
||
(format "Output file: (default %s) " f)
|
||
nil f nil)))))
|
||
(emerge-files-with-ancestor-internal
|
||
file-A file-B file-ancestor startup-hooks
|
||
(if arg
|
||
(cons (` (lambda () (emerge-files-exit (, file-out))))
|
||
quit-hooks)
|
||
quit-hooks)
|
||
file-out))
|
||
|
||
;; Write the merge buffer out in place of the file the A buffer is visiting.
|
||
(defun emerge-files-exit (file-out)
|
||
;; if merge was successful was given, save to disk
|
||
(if (not emerge-prefix-argument)
|
||
(emerge-write-and-delete file-out)))
|
||
|
||
;;; Functions to start Emerge on buffers
|
||
|
||
;;;###autoload
|
||
(defun emerge-buffers (buffer-A buffer-B &optional startup-hooks quit-hooks)
|
||
"Run Emerge on two buffers."
|
||
(interactive "bBuffer A to merge: \nbBuffer B to merge: ")
|
||
(let ((emerge-file-A (emerge-make-temp-file "A"))
|
||
(emerge-file-B (emerge-make-temp-file "B")))
|
||
(emerge-eval-in-buffer
|
||
buffer-A
|
||
(write-region (point-min) (point-max) emerge-file-A nil 'no-message))
|
||
(emerge-eval-in-buffer
|
||
buffer-B
|
||
(write-region (point-min) (point-max) emerge-file-B nil 'no-message))
|
||
(emerge-setup (get-buffer buffer-A) emerge-file-A
|
||
(get-buffer buffer-B) emerge-file-B
|
||
(cons (function (lambda ()
|
||
(delete-file emerge-file-A)
|
||
(delete-file emerge-file-B)))
|
||
startup-hooks)
|
||
quit-hooks
|
||
nil)))
|
||
|
||
;;;###autoload
|
||
(defun emerge-buffers-with-ancestor (buffer-A buffer-B buffer-ancestor
|
||
&optional startup-hooks
|
||
quit-hooks)
|
||
"Run Emerge on two buffers, giving another buffer as the ancestor."
|
||
(interactive
|
||
"bBuffer A to merge: \nbBuffer B to merge: \nbAncestor buffer: ")
|
||
(let ((emerge-file-A (emerge-make-temp-file "A"))
|
||
(emerge-file-B (emerge-make-temp-file "B"))
|
||
(emerge-file-ancestor (emerge-make-temp-file "anc")))
|
||
(emerge-eval-in-buffer
|
||
buffer-A
|
||
(write-region (point-min) (point-max) emerge-file-A nil 'no-message))
|
||
(emerge-eval-in-buffer
|
||
buffer-B
|
||
(write-region (point-min) (point-max) emerge-file-B nil 'no-message))
|
||
(emerge-eval-in-buffer
|
||
buffer-ancestor
|
||
(write-region (point-min) (point-max) emerge-file-ancestor nil
|
||
'no-message))
|
||
(emerge-setup-with-ancestor (get-buffer buffer-A) emerge-file-A
|
||
(get-buffer buffer-B) emerge-file-B
|
||
(get-buffer buffer-ancestor)
|
||
emerge-file-ancestor
|
||
(cons (function (lambda ()
|
||
(delete-file emerge-file-A)
|
||
(delete-file emerge-file-B)
|
||
(delete-file
|
||
emerge-file-ancestor)))
|
||
startup-hooks)
|
||
quit-hooks
|
||
nil)))
|
||
|
||
;;; Functions to start Emerge from the command line
|
||
|
||
;;;###autoload
|
||
(defun emerge-files-command ()
|
||
(let ((file-a (nth 0 command-line-args-left))
|
||
(file-b (nth 1 command-line-args-left))
|
||
(file-out (nth 2 command-line-args-left)))
|
||
(setq command-line-args-left (nthcdr 3 command-line-args-left))
|
||
(emerge-files-internal
|
||
file-a file-b nil
|
||
(list (` (lambda () (emerge-command-exit (, file-out))))))))
|
||
|
||
;;;###autoload
|
||
(defun emerge-files-with-ancestor-command ()
|
||
(let (file-a file-b file-anc file-out)
|
||
;; check for a -a flag, for filemerge compatibility
|
||
(if (string= (car command-line-args-left) "-a")
|
||
;; arguments are "-a ancestor file-a file-b file-out"
|
||
(progn
|
||
(setq file-a (nth 2 command-line-args-left))
|
||
(setq file-b (nth 3 command-line-args-left))
|
||
(setq file-anc (nth 1 command-line-args-left))
|
||
(setq file-out (nth 4 command-line-args-left))
|
||
(setq command-line-args-left (nthcdr 5 command-line-args-left)))
|
||
;; arguments are "file-a file-b ancestor file-out"
|
||
(setq file-a (nth 0 command-line-args-left))
|
||
(setq file-b (nth 1 command-line-args-left))
|
||
(setq file-anc (nth 2 command-line-args-left))
|
||
(setq file-out (nth 3 command-line-args-left))
|
||
(setq command-line-args-left (nthcdr 4 command-line-args-left)))
|
||
(emerge-files-with-ancestor-internal
|
||
file-a file-b file-anc nil
|
||
(list (` (lambda () (emerge-command-exit (, file-out))))))))
|
||
|
||
(defun emerge-command-exit (file-out)
|
||
(emerge-write-and-delete file-out)
|
||
(kill-emacs (if emerge-prefix-argument 1 0)))
|
||
|
||
;;; Functions to start Emerge via remote request
|
||
|
||
;;;###autoload
|
||
(defun emerge-files-remote (file-a file-b file-out)
|
||
(setq emerge-file-out file-out)
|
||
(emerge-files-internal
|
||
file-a file-b nil
|
||
(list (` (lambda () (emerge-remote-exit (, file-out) '(, exit-func)))))
|
||
file-out)
|
||
(throw 'client-wait nil))
|
||
|
||
;;;###autoload
|
||
(defun emerge-files-with-ancestor-remote (file-a file-b file-anc file-out)
|
||
(setq emerge-file-out file-out)
|
||
(emerge-files-with-ancestor-internal
|
||
file-a file-b file-anc nil
|
||
(list (` (lambda () (emerge-remote-exit (, file-out) '(, exit-func)))))
|
||
file-out)
|
||
(throw 'client-wait nil))
|
||
|
||
(defun emerge-remote-exit (file-out exit-func)
|
||
(emerge-write-and-delete file-out)
|
||
(kill-buffer emerge-merge-buffer)
|
||
(funcall exit-func (if emerge-prefix-argument 1 0)))
|
||
|
||
;;; Common setup routines
|
||
|
||
;; Set up the window configuration. If POS is given, set the points to
|
||
;; the beginnings of the buffers.
|
||
(defun emerge-setup-windows (buffer-A buffer-B merge-buffer &optional pos)
|
||
;; Make sure we are not in the minibuffer window when we try to delete
|
||
;; all other windows.
|
||
(if (eq (selected-window) (minibuffer-window))
|
||
(other-window 1))
|
||
(delete-other-windows)
|
||
(switch-to-buffer merge-buffer)
|
||
(emerge-refresh-mode-line)
|
||
(split-window-vertically)
|
||
(split-window-horizontally)
|
||
(switch-to-buffer buffer-A)
|
||
(if pos
|
||
(goto-char (point-min)))
|
||
(other-window 1)
|
||
(switch-to-buffer buffer-B)
|
||
(if pos
|
||
(goto-char (point-min)))
|
||
(other-window 1)
|
||
(if pos
|
||
(goto-char (point-min)))
|
||
;; If diff/diff3 reports errors, display them rather than the merge buffer.
|
||
(if (/= 0 (emerge-eval-in-buffer emerge-diff-error-buffer (buffer-size)))
|
||
(progn
|
||
(ding)
|
||
(message "Errors found in diff/diff3 output. Merge buffer is %s."
|
||
(buffer-name emerge-merge-buffer))
|
||
(switch-to-buffer emerge-diff-error-buffer))))
|
||
|
||
;; Set up the keymap in the merge buffer
|
||
(defun emerge-set-keys ()
|
||
;; Set up fixed keymaps if necessary
|
||
(if (not emerge-basic-keymap)
|
||
(emerge-setup-fixed-keymaps))
|
||
;; Save the old local map
|
||
(setq emerge-old-keymap (current-local-map))
|
||
;; Construct the edit keymap
|
||
(setq emerge-edit-keymap (if emerge-old-keymap
|
||
(copy-keymap emerge-old-keymap)
|
||
(make-sparse-keymap)))
|
||
;; Install the Emerge commands
|
||
(emerge-force-define-key emerge-edit-keymap emerge-command-prefix
|
||
'emerge-basic-keymap)
|
||
;; Suppress write-file and save-buffer
|
||
(emerge-recursively-substitute-key-definition 'write-file
|
||
'emerge-query-write-file
|
||
emerge-edit-keymap)
|
||
(emerge-recursively-substitute-key-definition 'save-buffer
|
||
'emerge-query-save-buffer
|
||
emerge-edit-keymap)
|
||
(emerge-shadow-key-definition 'write-file 'emerge-query-write-file
|
||
(current-global-map) emerge-edit-keymap)
|
||
(emerge-shadow-key-definition 'save-buffer 'emerge-query-save-buffer
|
||
(current-global-map) emerge-edit-keymap)
|
||
(use-local-map emerge-fast-keymap)
|
||
(setq emerge-edit-mode nil)
|
||
(setq emerge-fast-mode t))
|
||
|
||
(defun emerge-remember-buffer-characteristics ()
|
||
"Remembers certain properties of the buffers being merged.
|
||
Must be called in the merge buffer. Remembers read-only, modified,
|
||
auto-save, and saves them in buffer local variables. Sets the buffers
|
||
read-only and turns off `auto-save-mode'.
|
||
These characteristics are restored by emerge-restore-buffer-characteristics."
|
||
;; force auto-save, because we will turn off auto-saving in buffers for the
|
||
;; duration
|
||
(do-auto-save)
|
||
;; remember and alter buffer characteristics
|
||
(setq emerge-A-buffer-values
|
||
(emerge-eval-in-buffer
|
||
emerge-A-buffer
|
||
(prog1
|
||
(emerge-save-variables emerge-saved-variables)
|
||
(emerge-restore-variables emerge-saved-variables
|
||
emerge-merging-values))))
|
||
(setq emerge-B-buffer-values
|
||
(emerge-eval-in-buffer
|
||
emerge-B-buffer
|
||
(prog1
|
||
(emerge-save-variables emerge-saved-variables)
|
||
(emerge-restore-variables emerge-saved-variables
|
||
emerge-merging-values)))))
|
||
|
||
(defun emerge-restore-buffer-characteristics ()
|
||
"Restores the characteristics remembered by
|
||
emerge-remember-buffer-characteristics."
|
||
(let ((A-values emerge-A-buffer-values)
|
||
(B-values emerge-B-buffer-values))
|
||
(emerge-eval-in-buffer emerge-A-buffer
|
||
(emerge-restore-variables emerge-saved-variables
|
||
A-values))
|
||
(emerge-eval-in-buffer emerge-B-buffer
|
||
(emerge-restore-variables emerge-saved-variables
|
||
B-values))))
|
||
|
||
(defun emerge-convert-diffs-to-markers (A-buffer
|
||
B-buffer
|
||
merge-buffer
|
||
lineno-list)
|
||
(let* (marker-list
|
||
(A-point-min (emerge-eval-in-buffer A-buffer (point-min)))
|
||
(offset (1- A-point-min))
|
||
(A-hidden-lines (emerge-eval-in-buffer
|
||
A-buffer
|
||
(save-restriction
|
||
(widen)
|
||
(count-lines 1 A-point-min))))
|
||
(B-point-min (emerge-eval-in-buffer B-buffer (point-min)))
|
||
(B-hidden-lines (emerge-eval-in-buffer
|
||
B-buffer
|
||
(save-restriction
|
||
(widen)
|
||
(count-lines 1 B-point-min)))))
|
||
(while lineno-list
|
||
(let* ((list-element (car lineno-list))
|
||
a-begin-marker
|
||
a-end-marker
|
||
b-begin-marker
|
||
b-end-marker
|
||
(a-begin (aref list-element 0))
|
||
(a-end (aref list-element 1))
|
||
(b-begin (aref list-element 2))
|
||
(b-end (aref list-element 3))
|
||
(state (aref list-element 4)))
|
||
;; place markers at the appropriate places in the buffers
|
||
(emerge-eval-in-buffer
|
||
A-buffer
|
||
(goto-line (+ a-begin A-hidden-lines))
|
||
(setq a-begin-marker (point-marker))
|
||
(goto-line (+ a-end A-hidden-lines))
|
||
(setq a-end-marker (point-marker)))
|
||
(emerge-eval-in-buffer
|
||
B-buffer
|
||
(goto-line (+ b-begin B-hidden-lines))
|
||
(setq b-begin-marker (point-marker))
|
||
(goto-line (+ b-end B-hidden-lines))
|
||
(setq b-end-marker (point-marker)))
|
||
(setq merge-begin-marker (set-marker
|
||
(make-marker)
|
||
(- (marker-position a-begin-marker)
|
||
offset)
|
||
merge-buffer))
|
||
(setq merge-end-marker (set-marker
|
||
(make-marker)
|
||
(- (marker-position a-end-marker)
|
||
offset)
|
||
merge-buffer))
|
||
;; record all the markers for this difference
|
||
(setq marker-list (cons (vector a-begin-marker a-end-marker
|
||
b-begin-marker b-end-marker
|
||
merge-begin-marker merge-end-marker
|
||
state)
|
||
marker-list)))
|
||
(setq lineno-list (cdr lineno-list)))
|
||
;; convert the list of difference information into a vector for
|
||
;; fast access
|
||
(setq emerge-difference-list (apply 'vector (nreverse marker-list)))))
|
||
|
||
;; If we have an ancestor, select all B variants that we prefer
|
||
(defun emerge-select-prefer-Bs ()
|
||
(let ((n 0))
|
||
(while (< n emerge-number-of-differences)
|
||
(if (eq (aref (aref emerge-difference-list n) 6) 'prefer-B)
|
||
(progn
|
||
(emerge-unselect-and-select-difference n t)
|
||
(emerge-select-B)
|
||
(aset (aref emerge-difference-list n) 6 'prefer-B)))
|
||
(setq n (1+ n))))
|
||
(emerge-unselect-and-select-difference -1))
|
||
|
||
;;; Common exit routines
|
||
|
||
(defun emerge-write-and-delete (file-out)
|
||
;; clear screen format
|
||
(delete-other-windows)
|
||
;; delete A, B, and ancestor buffers, if they haven't been changed
|
||
(if (not (buffer-modified-p emerge-A-buffer))
|
||
(kill-buffer emerge-A-buffer))
|
||
(if (not (buffer-modified-p emerge-B-buffer))
|
||
(kill-buffer emerge-B-buffer))
|
||
(if (and emerge-ancestor-buffer
|
||
(not (buffer-modified-p emerge-ancestor-buffer)))
|
||
(kill-buffer emerge-ancestor-buffer))
|
||
;; Write merge buffer to file
|
||
(write-file file-out))
|
||
|
||
;;; Commands
|
||
|
||
(defun emerge-recenter (&optional arg)
|
||
"Bring the highlighted region of all three merge buffers into view.
|
||
This brings the buffers into view if they are in windows.
|
||
If an ARGUMENT is given, the default three-window display is reestablished."
|
||
(interactive "P")
|
||
;; If there is an argument, rebuild the window structure
|
||
(if arg
|
||
(emerge-setup-windows emerge-A-buffer emerge-B-buffer
|
||
emerge-merge-buffer))
|
||
;; Redisplay whatever buffers are showing, if there is a selected difference
|
||
(if (and (>= emerge-current-difference 0)
|
||
(< emerge-current-difference emerge-number-of-differences))
|
||
(let* ((merge-buffer emerge-merge-buffer)
|
||
(buffer-A emerge-A-buffer)
|
||
(buffer-B emerge-B-buffer)
|
||
(window-A (get-buffer-window buffer-A))
|
||
(window-B (get-buffer-window buffer-B))
|
||
(merge-window (get-buffer-window merge-buffer))
|
||
(diff-vector
|
||
(aref emerge-difference-list emerge-current-difference)))
|
||
(if window-A (progn
|
||
(select-window window-A)
|
||
(emerge-position-region
|
||
(- (aref diff-vector 0)
|
||
(1- emerge-before-flag-length))
|
||
(+ (aref diff-vector 1)
|
||
(1- emerge-after-flag-length))
|
||
(1+ (aref diff-vector 0)))))
|
||
(if window-B (progn
|
||
(select-window window-B)
|
||
(emerge-position-region
|
||
(- (aref diff-vector 2)
|
||
(1- emerge-before-flag-length))
|
||
(+ (aref diff-vector 3)
|
||
(1- emerge-after-flag-length))
|
||
(1+ (aref diff-vector 2)))))
|
||
(if merge-window (progn
|
||
(select-window merge-window)
|
||
(emerge-position-region
|
||
(- (aref diff-vector 4)
|
||
(1- emerge-before-flag-length))
|
||
(+ (aref diff-vector 5)
|
||
(1- emerge-after-flag-length))
|
||
(1+ (aref diff-vector 4))))))))
|
||
|
||
;;; Window scrolling operations
|
||
;; These operations are designed to scroll all three windows the same amount,
|
||
;; so as to keep the text in them aligned.
|
||
|
||
;; Perform some operation on all three windows (if they are showing).
|
||
;; Catches all errors on the operation in the A and B windows, but not
|
||
;; in the merge window. Usually, errors come from scrolling off the
|
||
;; beginning or end of the buffer, and this gives a nice error message:
|
||
;; End of buffer is reported in the merge buffer, but if the scroll was
|
||
;; possible in the A or B windows, it is performed there before the error
|
||
;; is reported.
|
||
(defun emerge-operate-on-windows (operation arg)
|
||
(let* ((merge-buffer emerge-merge-buffer)
|
||
(buffer-A emerge-A-buffer)
|
||
(buffer-B emerge-B-buffer)
|
||
(window-A (get-buffer-window buffer-A))
|
||
(window-B (get-buffer-window buffer-B))
|
||
(merge-window (get-buffer-window merge-buffer)))
|
||
(if window-A (progn
|
||
(select-window window-A)
|
||
(condition-case nil
|
||
(funcall operation arg)
|
||
(error))))
|
||
(if window-B (progn
|
||
(select-window window-B)
|
||
(condition-case nil
|
||
(funcall operation arg)
|
||
(error))))
|
||
(if merge-window (progn
|
||
(select-window merge-window)
|
||
(funcall operation arg)))))
|
||
|
||
(defun emerge-scroll-up (&optional arg)
|
||
"Scroll up all three merge buffers, if they are in windows.
|
||
If an ARGUMENT is given, that is how many lines are scrolled, else nearly
|
||
the size of the merge window. `C-u -' alone as argument scrolls half the
|
||
size of the merge window."
|
||
(interactive "P")
|
||
(emerge-operate-on-windows
|
||
'scroll-up
|
||
;; calculate argument to scroll-up
|
||
;; if there is an explicit argument
|
||
(if (and arg (not (equal arg '-)))
|
||
;; use it
|
||
(prefix-numeric-value arg)
|
||
;; if not, see if we can determine a default amount (the window height)
|
||
(let ((merge-window (get-buffer-window emerge-merge-buffer)))
|
||
(if (null merge-window)
|
||
;; no window, use nil
|
||
nil
|
||
(let ((default-amount
|
||
(- (window-height merge-window) 1 next-screen-context-lines)))
|
||
;; the window was found
|
||
(if arg
|
||
;; C-u as argument means half of default amount
|
||
(/ default-amount 2)
|
||
;; no argument means default amount
|
||
default-amount)))))))
|
||
|
||
(defun emerge-scroll-down (&optional arg)
|
||
"Scroll down all three merge buffers, if they are in windows.
|
||
If an ARGUMENT is given, that is how many lines are scrolled, else nearly
|
||
the size of the merge window. `C-u -' alone as argument scrolls half the
|
||
size of the merge window."
|
||
(interactive "P")
|
||
(emerge-operate-on-windows
|
||
'scroll-down
|
||
;; calculate argument to scroll-down
|
||
;; if there is an explicit argument
|
||
(if (and arg (not (equal arg '-)))
|
||
;; use it
|
||
(prefix-numeric-value arg)
|
||
;; if not, see if we can determine a default amount (the window height)
|
||
(let ((merge-window (get-buffer-window emerge-merge-buffer)))
|
||
(if (null merge-window)
|
||
;; no window, use nil
|
||
nil
|
||
(let ((default-amount
|
||
(- (window-height merge-window) 1 next-screen-context-lines)))
|
||
;; the window was found
|
||
(if arg
|
||
;; C-u as argument means half of default amount
|
||
(/ default-amount 2)
|
||
;; no argument means default amount
|
||
default-amount)))))))
|
||
|
||
(defun emerge-scroll-left (&optional arg)
|
||
"Scroll left all three merge buffers, if they are in windows.
|
||
If an ARGUMENT is given, that is how many columns are scrolled, else nearly
|
||
the width of the A and B windows. C-u - alone as argument scrolls half the
|
||
width of the A and B windows."
|
||
(interactive "P")
|
||
(emerge-operate-on-windows
|
||
'scroll-left
|
||
;; calculate argument to scroll-left
|
||
;; if there is an explicit argument
|
||
(if (and arg (not (equal arg '-)))
|
||
;; use it
|
||
(prefix-numeric-value arg)
|
||
;; if not, see if we can determine a default amount
|
||
;; (half the window width)
|
||
(let ((merge-window (get-buffer-window emerge-merge-buffer)))
|
||
(if (null merge-window)
|
||
;; no window, use nil
|
||
nil
|
||
(let ((default-amount
|
||
(- (/ (window-width merge-window) 2) 3)))
|
||
;; the window was found
|
||
(if arg
|
||
;; C-u as argument means half of default amount
|
||
(/ default-amount 2)
|
||
;; no argument means default amount
|
||
default-amount)))))))
|
||
|
||
(defun emerge-scroll-right (&optional arg)
|
||
"Scroll right all three merge buffers, if they are in windows.
|
||
If an ARGUMENT is given, that is how many columns are scrolled, else nearly
|
||
the width of the A and B windows. C-u - alone as argument scrolls half the
|
||
width of the A and B windows."
|
||
(interactive "P")
|
||
(emerge-operate-on-windows
|
||
'scroll-right
|
||
;; calculate argument to scroll-right
|
||
;; if there is an explicit argument
|
||
(if (and arg (not (equal arg '-)))
|
||
;; use it
|
||
(prefix-numeric-value arg)
|
||
;; if not, see if we can determine a default amount
|
||
;; (half the window width)
|
||
(let ((merge-window (get-buffer-window emerge-merge-buffer)))
|
||
(if (null merge-window)
|
||
;; no window, use nil
|
||
nil
|
||
(let ((default-amount
|
||
(- (/ (window-width merge-window) 2) 3)))
|
||
;; the window was found
|
||
(if arg
|
||
;; C-u as argument means half of default amount
|
||
(/ default-amount 2)
|
||
;; no argument means default amount
|
||
default-amount)))))))
|
||
|
||
(defun emerge-scroll-reset ()
|
||
"Reset horizontal scrolling.
|
||
This resets the horizontal scrolling of all three merge buffers
|
||
to the left margin, if they are in windows."
|
||
(interactive)
|
||
(emerge-operate-on-windows
|
||
(function (lambda (x) (set-window-hscroll (selected-window) 0)))
|
||
nil))
|
||
|
||
;; Attempt to show the region nicely.
|
||
;; If there are min-lines lines above and below the region, then don't do
|
||
;; anything.
|
||
;; If not, recenter the region to make it so.
|
||
;; If that isn't possible, remove context lines balancedly from top and botton
|
||
;; so the entire region shows.
|
||
;; If that isn't possible, show the top of the region.
|
||
;; BEG must be at the beginning of a line.
|
||
(defun emerge-position-region (beg end pos)
|
||
;; First test whether the entire region is visible with
|
||
;; emerge-min-visible-lines above and below it
|
||
(if (not (and (<= (progn
|
||
(move-to-window-line emerge-min-visible-lines)
|
||
(point))
|
||
beg)
|
||
(<= end (progn
|
||
(move-to-window-line
|
||
(- (1+ emerge-min-visible-lines)))
|
||
(point)))))
|
||
;; We failed that test, see if it fits at all
|
||
;; Meanwhile positioning it correctly in case it doesn't fit
|
||
(progn
|
||
(set-window-start (selected-window) beg)
|
||
(setq fits (pos-visible-in-window-p end))
|
||
(if fits
|
||
;; Determine the number of lines that the region occupies
|
||
(let ((lines 0))
|
||
(while (> end (progn
|
||
(move-to-window-line lines)
|
||
(point)))
|
||
(setq lines (1+ lines)))
|
||
;; And position the beginning on the right line
|
||
(goto-char beg)
|
||
(recenter (/ (1+ (- (1- (window-height (selected-window)))
|
||
lines))
|
||
2))))))
|
||
(goto-char pos))
|
||
|
||
(defun emerge-next-difference ()
|
||
"Advance to the next difference."
|
||
(interactive)
|
||
(if (< emerge-current-difference emerge-number-of-differences)
|
||
(let ((n (1+ emerge-current-difference)))
|
||
(while (and emerge-skip-prefers
|
||
(< n emerge-number-of-differences)
|
||
(memq (aref (aref emerge-difference-list n) 6)
|
||
'(prefer-A prefer-B)))
|
||
(setq n (1+ n)))
|
||
(let ((buffer-read-only nil))
|
||
(emerge-unselect-and-select-difference n)))
|
||
(error "At end")))
|
||
|
||
(defun emerge-previous-difference ()
|
||
"Go to the previous difference."
|
||
(interactive)
|
||
(if (> emerge-current-difference -1)
|
||
(let ((n (1- emerge-current-difference)))
|
||
(while (and emerge-skip-prefers
|
||
(> n -1)
|
||
(memq (aref (aref emerge-difference-list n) 6)
|
||
'(prefer-A prefer-B)))
|
||
(setq n (1- n)))
|
||
(let ((buffer-read-only nil))
|
||
(emerge-unselect-and-select-difference n)))
|
||
(error "At beginning")))
|
||
|
||
(defun emerge-jump-to-difference (difference-number)
|
||
"Go to the N-th difference."
|
||
(interactive "p")
|
||
(let ((buffer-read-only nil))
|
||
(setq difference-number (1- difference-number))
|
||
(if (and (>= difference-number -1)
|
||
(< difference-number (1+ emerge-number-of-differences)))
|
||
(emerge-unselect-and-select-difference difference-number)
|
||
(error "Bad difference number"))))
|
||
|
||
(defun emerge-quit (arg)
|
||
"Finish an Emerge session.
|
||
Prefix argument means to abort rather than successfully finish.
|
||
The difference depends on how the merge was started,
|
||
but usually means to not write over one of the original files, or to signal
|
||
to some process which invoked Emerge a failure code.
|
||
|
||
Unselects the selected difference, if any, restores the read-only and modified
|
||
flags of the merged file buffers, restores the local keymap of the merge
|
||
buffer, and sets off various emerge flags. Using Emerge commands in this
|
||
buffer after this will cause serious problems."
|
||
(interactive "P")
|
||
(if (prog1
|
||
(y-or-n-p
|
||
(if (not arg)
|
||
"Do you really want to successfully finish this merge? "
|
||
"Do you really want to abort this merge? "))
|
||
(message ""))
|
||
(emerge-really-quit arg)))
|
||
|
||
;; Perform the quit operations.
|
||
(defun emerge-really-quit (arg)
|
||
(setq buffer-read-only nil)
|
||
(emerge-unselect-and-select-difference -1)
|
||
(emerge-restore-buffer-characteristics)
|
||
;; null out the difference markers so they don't slow down future editing
|
||
;; operations
|
||
(mapcar (function (lambda (d)
|
||
(set-marker (aref d 0) nil)
|
||
(set-marker (aref d 1) nil)
|
||
(set-marker (aref d 2) nil)
|
||
(set-marker (aref d 3) nil)
|
||
(set-marker (aref d 4) nil)
|
||
(set-marker (aref d 5) nil)))
|
||
emerge-difference-list)
|
||
;; allow them to be garbage collected
|
||
(setq emerge-difference-list nil)
|
||
;; restore the local map
|
||
(use-local-map emerge-old-keymap)
|
||
;; turn off all the emerge modes
|
||
(setq emerge-mode nil)
|
||
(setq emerge-fast-mode nil)
|
||
(setq emerge-edit-mode nil)
|
||
(setq emerge-auto-advance nil)
|
||
(setq emerge-skip-prefers nil)
|
||
;; restore mode line
|
||
(kill-local-variable 'mode-line-buffer-identification)
|
||
(let ((emerge-prefix-argument arg))
|
||
(run-hooks 'emerge-quit-hook)))
|
||
|
||
(defun emerge-select-A (&optional force)
|
||
"Select the A variant of this difference.
|
||
Refuses to function if this difference has been edited, i.e., if it
|
||
is neither the A nor the B variant.
|
||
An ARGUMENT forces the variant to be selected even if the difference has
|
||
been edited."
|
||
(interactive "P")
|
||
(let ((operate
|
||
(function (lambda ()
|
||
(emerge-select-A-edit merge-begin merge-end A-begin A-end)
|
||
(if emerge-auto-advance
|
||
(emerge-next-difference)))))
|
||
(operate-no-change
|
||
(function (lambda ()
|
||
(if emerge-auto-advance
|
||
(emerge-next-difference))))))
|
||
(emerge-select-version force operate-no-change operate operate)))
|
||
|
||
;; Actually select the A variant
|
||
(defun emerge-select-A-edit (merge-begin merge-end A-begin A-end)
|
||
(emerge-eval-in-buffer
|
||
emerge-merge-buffer
|
||
(delete-region merge-begin merge-end)
|
||
(goto-char merge-begin)
|
||
(insert-buffer-substring emerge-A-buffer A-begin A-end)
|
||
(goto-char merge-begin)
|
||
(aset diff-vector 6 'A)
|
||
(emerge-refresh-mode-line)))
|
||
|
||
(defun emerge-select-B (&optional force)
|
||
"Select the B variant of this difference.
|
||
Refuses to function if this difference has been edited, i.e., if it
|
||
is neither the A nor the B variant. An ARGUMENT forces the variant to be selected even if the difference has
|
||
been edited."
|
||
(interactive "P")
|
||
(let ((operate
|
||
(function (lambda ()
|
||
(emerge-select-B-edit merge-begin merge-end B-begin B-end)
|
||
(if emerge-auto-advance
|
||
(emerge-next-difference)))))
|
||
(operate-no-change
|
||
(function (lambda ()
|
||
(if emerge-auto-advance
|
||
(emerge-next-difference))))))
|
||
(emerge-select-version force operate operate-no-change operate)))
|
||
|
||
;; Actually select the B variant
|
||
(defun emerge-select-B-edit (merge-begin merge-end B-begin B-end)
|
||
(emerge-eval-in-buffer
|
||
emerge-merge-buffer
|
||
(delete-region merge-begin merge-end)
|
||
(goto-char merge-begin)
|
||
(insert-buffer-substring emerge-B-buffer B-begin B-end)
|
||
(goto-char merge-begin)
|
||
(aset diff-vector 6 'B)
|
||
(emerge-refresh-mode-line)))
|
||
|
||
(defun emerge-default-A ()
|
||
"Selects the A variant.
|
||
This selects the A variant for all differences from here down in the buffer
|
||
which are still defaulted, i.e., which the user has not selected and for
|
||
which there is no preference."
|
||
(interactive)
|
||
(let ((buffer-read-only nil))
|
||
(let ((selected-difference emerge-current-difference)
|
||
(n (max emerge-current-difference 0)))
|
||
(while (< n emerge-number-of-differences)
|
||
(let ((diff-vector (aref emerge-difference-list n)))
|
||
(if (eq (aref diff-vector 6) 'default-B)
|
||
(progn
|
||
(emerge-unselect-and-select-difference n t)
|
||
(emerge-select-A)
|
||
(aset diff-vector 6 'default-A))))
|
||
(setq n (1+ n))
|
||
(if (= (* (/ n 10) 10) n)
|
||
(message "Setting default to A...%d" n)))
|
||
(emerge-unselect-and-select-difference selected-difference)))
|
||
(message "Default A set"))
|
||
|
||
(defun emerge-default-B ()
|
||
"Selects the B variant.
|
||
This selects the B variant for all differences from here down in the buffer
|
||
which are still defaulted, i.e., which the user has not selected and for
|
||
which there is no preference."
|
||
(interactive)
|
||
(let ((buffer-read-only nil))
|
||
(let ((selected-difference emerge-current-difference)
|
||
(n (max emerge-current-difference 0)))
|
||
(while (< n emerge-number-of-differences)
|
||
(let ((diff-vector (aref emerge-difference-list n)))
|
||
(if (eq (aref diff-vector 6) 'default-A)
|
||
(progn
|
||
(emerge-unselect-and-select-difference n t)
|
||
(emerge-select-B)
|
||
(aset diff-vector 6 'default-B))))
|
||
(setq n (1+ n))
|
||
(if (= (* (/ n 10) 10) n)
|
||
(message "Setting default to B...%d" n)))
|
||
(emerge-unselect-and-select-difference selected-difference)))
|
||
(message "Default B set"))
|
||
|
||
(defun emerge-fast-mode ()
|
||
"Set fast mode.
|
||
In this mode ordinary Emacs commands are disabled, and Emerge commands
|
||
are need not be prefixed with \\<emerge-fast-keymap>\\[emerge-basic-keymap]."
|
||
(interactive)
|
||
(setq buffer-read-only t)
|
||
(use-local-map emerge-fast-keymap)
|
||
(setq emerge-mode t)
|
||
(setq emerge-fast-mode t)
|
||
(setq emerge-edit-mode nil)
|
||
(message "Fast mode set")
|
||
;; force mode line redisplay
|
||
(set-buffer-modified-p (buffer-modified-p)))
|
||
|
||
(defun emerge-edit-mode ()
|
||
"Set edit mode.
|
||
In this mode ordinary Emacs commands are available, and Emerge commands
|
||
must be prefixed with \\<emerge-fast-keymap>\\[emerge-basic-keymap]."
|
||
(interactive)
|
||
(setq buffer-read-only nil)
|
||
(use-local-map emerge-edit-keymap)
|
||
(setq emerge-mode t)
|
||
(setq emerge-fast-mode nil)
|
||
(setq emerge-edit-mode t)
|
||
(message "Edit mode set")
|
||
;; force mode line redisplay
|
||
(set-buffer-modified-p (buffer-modified-p)))
|
||
|
||
(defun emerge-auto-advance (arg)
|
||
"Toggle auto-advance mode.
|
||
This mode causes `emerge-select-A' and `emerge-select-B' to automatically
|
||
advance to the next difference. (See `emerge-auto-advance'.)
|
||
If a positive ARGUMENT is given, it turns on `auto-advance-mode'.
|
||
If a negative ARGUMENT is given, it turns off `auto-advance-mode'."
|
||
(interactive "P")
|
||
(setq emerge-auto-advance (if (null arg)
|
||
(not emerge-auto-advance)
|
||
(> (prefix-numeric-value arg) 0)))
|
||
(message (if emerge-skip-prefers
|
||
"Auto-advance set"
|
||
"Auto-advance cleared"))
|
||
;; force mode line redisplay
|
||
(set-buffer-modified-p (buffer-modified-p)))
|
||
|
||
(defun emerge-skip-prefers (arg)
|
||
"Toggle skip-prefers mode.
|
||
This mode causes `emerge-next-difference' and `emerge-previous-difference'
|
||
to automatically skip over differences for which there is a preference.
|
||
(See `emerge-skip-prefers'.) If a positive ARG is given, it turns on
|
||
`skip-prefers' mode.
|
||
If a negative ARG is given, it turns off `skip-prefers' mode."
|
||
(interactive "P")
|
||
(setq emerge-skip-prefers (if (null arg)
|
||
(not emerge-skip-prefers)
|
||
(> (prefix-numeric-value arg) 0)))
|
||
(message (if emerge-skip-prefers
|
||
"Skip-prefers set"
|
||
"Skip-prefers cleared"))
|
||
;; force mode line redisplay
|
||
(set-buffer-modified-p (buffer-modified-p)))
|
||
|
||
(defun emerge-copy-as-kill-A ()
|
||
"Put the A variant of this difference in the kill ring."
|
||
(interactive)
|
||
(emerge-validate-difference)
|
||
(let* ((diff-vector
|
||
(aref emerge-difference-list emerge-current-difference))
|
||
(A-begin (1+ (aref diff-vector 0)))
|
||
(A-end (1- (aref diff-vector 1)))
|
||
;; so further kills don't append
|
||
this-command)
|
||
(save-excursion
|
||
(set-buffer emerge-A-buffer)
|
||
(copy-region-as-kill A-begin A-end))))
|
||
|
||
(defun emerge-copy-as-kill-B ()
|
||
"Put the B variant of this difference in the kill ring."
|
||
(interactive)
|
||
(emerge-validate-difference)
|
||
(let* ((diff-vector
|
||
(aref emerge-difference-list emerge-current-difference))
|
||
(B-begin (1+ (aref diff-vector 2)))
|
||
(B-end (1- (aref diff-vector 3)))
|
||
;; so further kills don't append
|
||
this-command)
|
||
(save-excursion
|
||
(set-buffer emerge-B-buffer)
|
||
(copy-region-as-kill B-begin B-end))))
|
||
|
||
(defun emerge-insert-A (arg)
|
||
"Insert the A variant of this difference at the point.
|
||
Leaves point after text, mark before.
|
||
With prefix argument, puts point before, mark after."
|
||
(interactive "P")
|
||
(emerge-validate-difference)
|
||
(let* ((diff-vector
|
||
(aref emerge-difference-list emerge-current-difference))
|
||
(A-begin (1+ (aref diff-vector 0)))
|
||
(A-end (1- (aref diff-vector 1)))
|
||
(opoint (point))
|
||
(buffer-read-only nil))
|
||
(insert-buffer-substring emerge-A-buffer A-begin A-end)
|
||
(if (not arg)
|
||
(set-mark opoint)
|
||
(set-mark (point))
|
||
(goto-char opoint))))
|
||
|
||
(defun emerge-insert-B (arg)
|
||
"Insert the B variant of this difference at the point.
|
||
Leaves point after text, mark before.
|
||
With prefix argument, puts point before, mark after."
|
||
(interactive "P")
|
||
(emerge-validate-difference)
|
||
(let* ((diff-vector
|
||
(aref emerge-difference-list emerge-current-difference))
|
||
(B-begin (1+ (aref diff-vector 2)))
|
||
(B-end (1- (aref diff-vector 3)))
|
||
(opoint (point))
|
||
(buffer-read-only nil))
|
||
(insert-buffer-substring emerge-B-buffer B-begin B-end)
|
||
(if (not arg)
|
||
(set-mark opoint)
|
||
(set-mark (point))
|
||
(goto-char opoint))))
|
||
|
||
(defun emerge-mark-difference (arg)
|
||
"Leaves the point before this difference and the mark after it.
|
||
With prefix argument, puts mark before, point after."
|
||
(interactive "P")
|
||
(emerge-validate-difference)
|
||
(let* ((diff-vector
|
||
(aref emerge-difference-list emerge-current-difference))
|
||
(merge-begin (1+ (aref diff-vector 4)))
|
||
(merge-end (1- (aref diff-vector 5))))
|
||
(if (not arg)
|
||
(progn
|
||
(goto-char merge-begin)
|
||
(set-mark merge-end))
|
||
(goto-char merge-end)
|
||
(set-mark merge-begin))))
|
||
|
||
(defun emerge-file-names ()
|
||
"Show the names of the buffers or files being operated on by Emerge.
|
||
Use C-u l to reset the windows afterward."
|
||
(interactive)
|
||
(delete-other-windows)
|
||
(let ((temp-buffer-show-function
|
||
(function (lambda (buf)
|
||
(split-window-vertically)
|
||
(switch-to-buffer buf)
|
||
(other-window 1)))))
|
||
(with-output-to-temp-buffer "*Help*"
|
||
(emerge-eval-in-buffer emerge-A-buffer
|
||
(if buffer-file-name
|
||
(progn
|
||
(princ "File A is: ")
|
||
(princ buffer-file-name))
|
||
(progn
|
||
(princ "Buffer A is: ")
|
||
(princ (buffer-name))))
|
||
(princ "\n"))
|
||
(emerge-eval-in-buffer emerge-B-buffer
|
||
(if buffer-file-name
|
||
(progn
|
||
(princ "File B is: ")
|
||
(princ buffer-file-name))
|
||
(progn
|
||
(princ "Buffer B is: ")
|
||
(princ (buffer-name))))
|
||
(princ "\n"))
|
||
(if emerge-ancestor-buffer
|
||
(emerge-eval-in-buffer emerge-ancestor-buffer
|
||
(if buffer-file-name
|
||
(progn
|
||
(princ "Ancestor file is: ")
|
||
(princ buffer-file-name))
|
||
(progn
|
||
(princ "Ancestor buffer is: ")
|
||
(princ (buffer-name))))
|
||
(princ "\n")))
|
||
(princ emerge-output-description))))
|
||
|
||
(defun emerge-join-differences (arg)
|
||
"Join the selected difference with the following one.
|
||
With a prefix argument, join with the preceeding one."
|
||
(interactive "P")
|
||
(let ((n emerge-current-difference))
|
||
;; adjust n to be first difference to join
|
||
(if arg
|
||
(setq n (1- n)))
|
||
;; n and n+1 are the differences to join
|
||
;; check that they are both differences
|
||
(if (or (< n 0) (>= n (1- emerge-number-of-differences)))
|
||
(error "Incorrect differences to join"))
|
||
;; remove the flags
|
||
(emerge-unselect-difference emerge-current-difference)
|
||
;; decrement total number of differences
|
||
(setq emerge-number-of-differences (1- emerge-number-of-differences))
|
||
;; build new differences vector
|
||
(let ((i 0)
|
||
(new-differences (make-vector emerge-number-of-differences nil)))
|
||
(while (< i emerge-number-of-differences)
|
||
(aset new-differences i
|
||
(cond
|
||
((< i n) (aref emerge-difference-list i))
|
||
((> i n) (aref emerge-difference-list (1+ i)))
|
||
(t (let ((prev (aref emerge-difference-list i))
|
||
(next (aref emerge-difference-list (1+ i))))
|
||
(vector (aref prev 0)
|
||
(aref next 1)
|
||
(aref prev 2)
|
||
(aref next 3)
|
||
(aref prev 4)
|
||
(aref next 5)
|
||
(let ((ps (aref prev 6))
|
||
(ns (aref next 6)))
|
||
(cond
|
||
((eq ps ns)
|
||
ps)
|
||
((and (or (eq ps 'B) (eq ps 'prefer-B))
|
||
(or (eq ns 'B) (eq ns 'prefer-B)))
|
||
'B)
|
||
(t 'A))))))))
|
||
(setq i (1+ i)))
|
||
(setq emerge-difference-list new-differences))
|
||
;; set the current difference correctly
|
||
(setq emerge-current-difference n)
|
||
;; fix the mode line
|
||
(emerge-refresh-mode-line)
|
||
;; reinsert the flags
|
||
(emerge-select-difference emerge-current-difference)
|
||
(emerge-recenter)))
|
||
|
||
(defun emerge-split-difference ()
|
||
"Split the current difference where the points are in the three windows."
|
||
(interactive)
|
||
(let ((n emerge-current-difference))
|
||
;; check that this is a valid difference
|
||
(emerge-validate-difference)
|
||
;; get the point values and old difference
|
||
(let ((A-point (emerge-eval-in-buffer emerge-A-buffer
|
||
(point-marker)))
|
||
(B-point (emerge-eval-in-buffer emerge-B-buffer
|
||
(point-marker)))
|
||
(merge-point (point-marker))
|
||
(old-diff (aref emerge-difference-list n)))
|
||
;; check location of the points, give error if they aren't in the
|
||
;; differences
|
||
(if (or (< A-point (aref old-diff 0))
|
||
(> A-point (aref old-diff 1)))
|
||
(error "Point outside of difference in A buffer"))
|
||
(if (or (< B-point (aref old-diff 2))
|
||
(> B-point (aref old-diff 3)))
|
||
(error "Point outside of difference in B buffer"))
|
||
(if (or (< merge-point (aref old-diff 4))
|
||
(> merge-point (aref old-diff 5)))
|
||
(error "Point outside of difference in merge buffer"))
|
||
;; remove the flags
|
||
(emerge-unselect-difference emerge-current-difference)
|
||
;; increment total number of differences
|
||
(setq emerge-number-of-differences (1+ emerge-number-of-differences))
|
||
;; build new differences vector
|
||
(let ((i 0)
|
||
(new-differences (make-vector emerge-number-of-differences nil)))
|
||
(while (< i emerge-number-of-differences)
|
||
(aset new-differences i
|
||
(cond
|
||
((< i n)
|
||
(aref emerge-difference-list i))
|
||
((> i (1+ n))
|
||
(aref emerge-difference-list (1- i)))
|
||
((= i n)
|
||
(vector (aref old-diff 0)
|
||
A-point
|
||
(aref old-diff 2)
|
||
B-point
|
||
(aref old-diff 4)
|
||
merge-point
|
||
(aref old-diff 6)))
|
||
(t
|
||
(vector (copy-marker A-point)
|
||
(aref old-diff 1)
|
||
(copy-marker B-point)
|
||
(aref old-diff 3)
|
||
(copy-marker merge-point)
|
||
(aref old-diff 5)
|
||
(aref old-diff 6)))))
|
||
(setq i (1+ i)))
|
||
(setq emerge-difference-list new-differences))
|
||
;; set the current difference correctly
|
||
(setq emerge-current-difference n)
|
||
;; fix the mode line
|
||
(emerge-refresh-mode-line)
|
||
;; reinsert the flags
|
||
(emerge-select-difference emerge-current-difference)
|
||
(emerge-recenter))))
|
||
|
||
(defun emerge-trim-difference ()
|
||
"Trim lines off top and bottom of difference that are the same.
|
||
If lines are the same in both the A and the B versions, strip them off.
|
||
(This can happen when the A and B versions have common lines that the
|
||
ancestor version does not share.)"
|
||
(interactive)
|
||
;; make sure we are in a real difference
|
||
(emerge-validate-difference)
|
||
;; remove the flags
|
||
(emerge-unselect-difference emerge-current-difference)
|
||
(let* ((diff (aref emerge-difference-list emerge-current-difference))
|
||
(top-a (marker-position (aref diff 0)))
|
||
(bottom-a (marker-position (aref diff 1)))
|
||
(top-b (marker-position (aref diff 2)))
|
||
(bottom-b (marker-position (aref diff 3)))
|
||
(top-m (marker-position (aref diff 4)))
|
||
(bottom-m (marker-position (aref diff 5)))
|
||
size success sa sb sm)
|
||
;; move down the tops of the difference regions as much as possible
|
||
;; Try advancing comparing 1000 chars at a time.
|
||
;; When that fails, go 500 chars at a time, and so on.
|
||
(setq size 1000)
|
||
(while (> size 0)
|
||
(setq success t)
|
||
(while success
|
||
(setq size (min size (- bottom-a top-a) (- bottom-b top-b)
|
||
(- bottom-m top-m)))
|
||
(setq sa (emerge-eval-in-buffer emerge-A-buffer
|
||
(buffer-substring top-a
|
||
(+ size top-a))))
|
||
(setq sb (emerge-eval-in-buffer emerge-B-buffer
|
||
(buffer-substring top-b
|
||
(+ size top-b))))
|
||
(setq sm (buffer-substring top-m (+ size top-m)))
|
||
(setq success (and (> size 0) (equal sa sb) (equal sb sm)))
|
||
(if success
|
||
(setq top-a (+ top-a size)
|
||
top-b (+ top-b size)
|
||
top-m (+ top-m size))))
|
||
(setq size (/ size 2)))
|
||
;; move up the bottoms of the difference regions as much as possible
|
||
;; Try advancing comparing 1000 chars at a time.
|
||
;; When that fails, go 500 chars at a time, and so on.
|
||
(setq size 1000)
|
||
(while (> size 0)
|
||
(setq success t)
|
||
(while success
|
||
(setq size (min size (- bottom-a top-a) (- bottom-b top-b)
|
||
(- bottom-m top-m)))
|
||
(setq sa (emerge-eval-in-buffer emerge-A-buffer
|
||
(buffer-substring (- bottom-a size)
|
||
bottom-a)))
|
||
(setq sb (emerge-eval-in-buffer emerge-B-buffer
|
||
(buffer-substring (- bottom-b size)
|
||
bottom-b)))
|
||
(setq sm (buffer-substring (- bottom-m size) bottom-m))
|
||
(setq success (and (> size 0) (equal sa sb) (equal sb sm)))
|
||
(if success
|
||
(setq bottom-a (- bottom-a size)
|
||
bottom-b (- bottom-b size)
|
||
bottom-m (- bottom-m size))))
|
||
(setq size (/ size 2)))
|
||
;; {top,bottom}-{a,b,m} are now set at the new beginnings and ends
|
||
;; of the difference regions. Move them to the beginning of lines, as
|
||
;; appropriate.
|
||
(emerge-eval-in-buffer emerge-A-buffer
|
||
(goto-char top-a)
|
||
(beginning-of-line)
|
||
(aset diff 0 (point-marker))
|
||
(goto-char bottom-a)
|
||
(beginning-of-line 2)
|
||
(aset diff 1 (point-marker)))
|
||
(emerge-eval-in-buffer emerge-B-buffer
|
||
(goto-char top-b)
|
||
(beginning-of-line)
|
||
(aset diff 2 (point-marker))
|
||
(goto-char bottom-b)
|
||
(beginning-of-line 2)
|
||
(aset diff 3 (point-marker)))
|
||
(goto-char top-m)
|
||
(beginning-of-line)
|
||
(aset diff 4 (point-marker))
|
||
(goto-char bottom-m)
|
||
(beginning-of-line 2)
|
||
(aset diff 5 (point-marker))
|
||
;; put the flags back in, recenter the display
|
||
(emerge-select-difference emerge-current-difference)
|
||
(emerge-recenter)))
|
||
|
||
(defun emerge-find-difference (arg)
|
||
"Find the difference containing the current position of the point.
|
||
If there is no containing difference and the prefix argument is positive,
|
||
it finds the nearest following difference. A negative prefix argument finds
|
||
the nearest previous difference."
|
||
(interactive "P")
|
||
;; search for the point in the merge buffer, using the markers
|
||
;; for the beginning and end of the differences in the merge buffer
|
||
(emerge-find-difference1 arg (point) 4 5))
|
||
|
||
(defun emerge-find-difference-A (arg)
|
||
"Find the difference containing the position of the point in the A buffer.
|
||
This command must be executed in the merge buffer.
|
||
If there is no containing difference and the prefix argument is positive,
|
||
it finds the nearest following difference. A negative prefix argument finds
|
||
the nearest previous difference."
|
||
(interactive "P")
|
||
;; search for the point in the A buffer, using the markers
|
||
;; for the beginning and end of the differences in the A buffer
|
||
(emerge-find-difference1 arg
|
||
(emerge-eval-in-buffer emerge-A-buffer (point))
|
||
0 1))
|
||
|
||
(defun emerge-find-difference-B (arg)
|
||
"Find the difference containing the position of the point in the B buffer.
|
||
This command must be executed in the merge buffer.
|
||
If there is no containing difference and the prefix argument is positive,
|
||
it finds the nearest following difference. A negative prefix argument finds
|
||
the nearest previous difference."
|
||
(interactive "P")
|
||
;; search for the point in the B buffer, using the markers
|
||
;; for the beginning and end of the differences in the B buffer
|
||
(emerge-find-difference1 arg
|
||
(emerge-eval-in-buffer emerge-B-buffer (point))
|
||
2 3))
|
||
|
||
(defun emerge-find-difference1 (arg location begin end)
|
||
(let* ((index
|
||
;; find first difference containing or after the current position
|
||
(catch 'search
|
||
(let ((n 0))
|
||
(while (< n emerge-number-of-differences)
|
||
(let ((diff-vector (aref emerge-difference-list n)))
|
||
(if (<= location (marker-position (aref diff-vector end)))
|
||
(throw 'search n)))
|
||
(setq n (1+ n))))
|
||
emerge-number-of-differences))
|
||
(contains
|
||
;; whether the found difference contains the current position
|
||
(and (< index emerge-number-of-differences)
|
||
(<= (marker-position (aref (aref emerge-difference-list index)
|
||
begin))
|
||
location)))
|
||
(arg-value
|
||
;; numeric value of prefix argument
|
||
(prefix-numeric-value arg)))
|
||
(emerge-unselect-and-select-difference
|
||
(cond
|
||
;; if the point is in a difference, select it
|
||
(contains index)
|
||
;; if the arg is nil and the point is not in a difference, error
|
||
((null arg) (error "No difference contains point"))
|
||
;; if the arg is positive, select the following difference
|
||
((> arg-value 0)
|
||
(if (< index emerge-number-of-differences)
|
||
index
|
||
(error "No difference contains or follows point")))
|
||
;; if the arg is negative, select the preceeding difference
|
||
(t
|
||
(if (> index 0)
|
||
(1- index)
|
||
(error "No difference contains or preceeds point")))))))
|
||
|
||
(defun emerge-line-numbers ()
|
||
"Display the current line numbers.
|
||
This function displays the line numbers of the points in the A, B, and
|
||
merge buffers."
|
||
(interactive)
|
||
(let* ((valid-diff
|
||
(and (>= emerge-current-difference 0)
|
||
(< emerge-current-difference emerge-number-of-differences)))
|
||
(diff (and valid-diff
|
||
(aref emerge-difference-list emerge-current-difference)))
|
||
(merge-line (emerge-line-number-in-buf 4 5))
|
||
(A-line (emerge-eval-in-buffer emerge-A-buffer
|
||
(emerge-line-number-in-buf 0 1)))
|
||
(B-line (emerge-eval-in-buffer emerge-B-buffer
|
||
(emerge-line-number-in-buf 2 3))))
|
||
(message "At lines: merge = %d, A = %d, B = %d"
|
||
merge-line A-line B-line)))
|
||
|
||
(defun emerge-line-number-in-buf (begin-marker end-marker)
|
||
(let (temp)
|
||
(setq temp (save-excursion
|
||
(beginning-of-line)
|
||
(1+ (count-lines 1 (point)))))
|
||
(if valid-diff
|
||
(progn
|
||
(if (> (point) (aref diff begin-marker))
|
||
(setq temp (- temp emerge-before-flag-lines)))
|
||
(if (> (point) (aref diff end-marker))
|
||
(setq temp (- temp emerge-after-flag-lines)))))
|
||
temp))
|
||
|
||
(defun emerge-set-combine-versions-template (start end &optional localize)
|
||
"Copy region into `emerge-combine-versions-template'.
|
||
This controls how `emerge-combine-versions' will combine the two versions.
|
||
With prefix argument, `emerge-combine-versions' is made local to this
|
||
merge buffer. Localization is permanent for any particular merge buffer."
|
||
(interactive "r\nP")
|
||
(if localize
|
||
(make-local-variable 'emerge-combine-versions-template))
|
||
(setq emerge-combine-versions-template (buffer-substring start end))
|
||
(message
|
||
(if (assq 'emerge-combine-versions-template (buffer-local-variables))
|
||
"emerge-set-combine-versions-template set locally."
|
||
"emerge-set-combine-versions-template set.")))
|
||
|
||
(defun emerge-combine-versions (&optional force)
|
||
"Combine versions using the template in `emerge-combine-versions-template'.
|
||
Refuses to function if this difference has been edited, i.e., if it is
|
||
neither the A nor the B variant.
|
||
An argument forces the variant to be selected even if the difference has
|
||
been edited."
|
||
(interactive "P")
|
||
(emerge-combine-versions-internal emerge-combine-versions-template force))
|
||
|
||
(defun emerge-combine-versions-register (char &optional force)
|
||
"Combine the two versions using the template in register REG.
|
||
See documentation of the variable `emerge-combine-versions-template'
|
||
for how the template is interpreted.
|
||
Refuses to function if this difference has been edited, i.e., if it is
|
||
neither the A nor the B variant.
|
||
An argument forces the variant to be selected even if the difference has
|
||
been edited."
|
||
(interactive "cRegister containing template: \nP")
|
||
(let ((template (get-register char)))
|
||
(if (not (stringp template))
|
||
(error "Register does not contain text"))
|
||
(emerge-combine-versions-internal template force)))
|
||
|
||
(defun emerge-combine-versions-internal (template force)
|
||
(let ((operate
|
||
(function (lambda ()
|
||
(emerge-combine-versions-edit merge-begin merge-end
|
||
A-begin A-end B-begin B-end)
|
||
(if emerge-auto-advance
|
||
(emerge-next-difference))))))
|
||
(emerge-select-version force operate operate operate)))
|
||
|
||
(defun emerge-combine-versions-edit (merge-begin merge-end
|
||
A-begin A-end B-begin B-end)
|
||
(emerge-eval-in-buffer
|
||
emerge-merge-buffer
|
||
(delete-region merge-begin merge-end)
|
||
(goto-char merge-begin)
|
||
(let ((i 0))
|
||
(while (< i (length template))
|
||
(let ((c (aref template i)))
|
||
(if (= c ?%)
|
||
(progn
|
||
(setq i (1+ i))
|
||
(setq c
|
||
(condition-case nil
|
||
(aref template i)
|
||
(error ?%)))
|
||
(cond ((= c ?a)
|
||
(insert-buffer-substring emerge-A-buffer A-begin A-end))
|
||
((= c ?b)
|
||
(insert-buffer-substring emerge-B-buffer B-begin B-end))
|
||
((= c ?%)
|
||
(insert ?%))
|
||
(t
|
||
(insert c))))
|
||
(insert c)))
|
||
(setq i (1+ i))))
|
||
(goto-char merge-begin)
|
||
(aset diff-vector 6 'combined)
|
||
(emerge-refresh-mode-line)))
|
||
|
||
(defun emerge-set-merge-mode (mode)
|
||
"Set the major mode in a merge buffer.
|
||
Overrides any change that the mode might make to the mode line or local
|
||
keymap. Leaves merge in fast mode."
|
||
(interactive
|
||
(list (intern (completing-read "New major mode for merge buffer: "
|
||
obarray 'commandp t nil))))
|
||
(funcall mode)
|
||
(emerge-refresh-mode-line)
|
||
(if emerge-fast-mode
|
||
(emerge-fast-mode)
|
||
(emerge-edit-mode)))
|
||
|
||
(defun emerge-one-line-window ()
|
||
(interactive)
|
||
(let ((window-min-height 1))
|
||
(shrink-window (- (window-height) 2))))
|
||
|
||
;;; Support routines
|
||
|
||
;; Select a difference by placing the visual flags around the appropriate
|
||
;; group of lines in the A, B, and merge buffers
|
||
(defun emerge-select-difference (n)
|
||
(let ((diff-vector (aref emerge-difference-list n)))
|
||
(emerge-place-flags-in-buffer emerge-A-buffer
|
||
(aref diff-vector 0) (aref diff-vector 1))
|
||
(emerge-place-flags-in-buffer emerge-B-buffer
|
||
(aref diff-vector 2) (aref diff-vector 3))
|
||
(emerge-place-flags-in-buffer emerge-merge-buffer
|
||
(aref diff-vector 4) (aref diff-vector 5))))
|
||
|
||
(defun emerge-place-flags-in-buffer (buffer before after)
|
||
(if (eq buffer emerge-merge-buffer)
|
||
(emerge-place-flags-in-buffer1 buffer before after)
|
||
(emerge-eval-in-buffer
|
||
buffer
|
||
(emerge-place-flags-in-buffer1 buffer before after))))
|
||
|
||
(defun emerge-place-flags-in-buffer1 (buffer before after)
|
||
(let ((buffer-read-only nil))
|
||
;; insert the flags
|
||
(goto-char before)
|
||
(insert-before-markers emerge-before-flag)
|
||
(goto-char after)
|
||
(insert emerge-after-flag)
|
||
;; put the markers into the flags, so alterations above or below won't move
|
||
;; them
|
||
;; before marker is one char before the end of the before flag
|
||
;; after marker is one char after the beginning of the after flag
|
||
(set-marker before (1- before))
|
||
(set-marker after (1+ after))))
|
||
|
||
;; Unselect a difference by removing the visual flags in the buffers.
|
||
(defun emerge-unselect-difference (n)
|
||
(let ((diff-vector (aref emerge-difference-list n)))
|
||
(emerge-remove-flags-in-buffer emerge-A-buffer
|
||
(aref diff-vector 0) (aref diff-vector 1))
|
||
(emerge-remove-flags-in-buffer emerge-B-buffer
|
||
(aref diff-vector 2) (aref diff-vector 3))
|
||
(emerge-remove-flags-in-buffer emerge-merge-buffer
|
||
(aref diff-vector 4) (aref diff-vector 5))))
|
||
|
||
(defun emerge-remove-flags-in-buffer (buffer before after)
|
||
(emerge-eval-in-buffer
|
||
buffer
|
||
(let ((buffer-read-only nil))
|
||
;; put the markers at the beginning of the flags
|
||
(set-marker before (- before (1- emerge-before-flag-length)))
|
||
(set-marker after (1- after))
|
||
;; remove the flags
|
||
(goto-char before)
|
||
(if (looking-at emerge-before-flag-match)
|
||
(delete-char emerge-before-flag-length)
|
||
;; the flag isn't there
|
||
(ding)
|
||
(message "Trouble removing flag."))
|
||
(goto-char after)
|
||
(if (looking-at emerge-after-flag-match)
|
||
(delete-char emerge-after-flag-length)
|
||
;; the flag isn't there
|
||
(ding)
|
||
(message "Trouble removing flag.")))))
|
||
|
||
;; Select a difference, removing an flags that exist now.
|
||
(defun emerge-unselect-and-select-difference (n &optional suppress-display)
|
||
(if (and (>= emerge-current-difference 0)
|
||
(< emerge-current-difference emerge-number-of-differences))
|
||
(emerge-unselect-difference emerge-current-difference))
|
||
(if (and (>= n 0) (< n emerge-number-of-differences))
|
||
(progn
|
||
(emerge-select-difference n)
|
||
(let* ((diff-vector (aref emerge-difference-list n))
|
||
(selection-type (aref diff-vector 6)))
|
||
(if (eq selection-type 'default-A)
|
||
(aset diff-vector 6 'A)
|
||
(if (eq selection-type 'default-B)
|
||
(aset diff-vector 6 'B))))))
|
||
(setq emerge-current-difference n)
|
||
(if (not suppress-display)
|
||
(progn
|
||
(emerge-recenter)
|
||
(emerge-refresh-mode-line))))
|
||
|
||
;; Perform tests to see whether user should be allowed to select a version
|
||
;; of this difference:
|
||
;; a valid difference has been selected; and
|
||
;; the difference text in the merge buffer is:
|
||
;; the A version (execute a-version), or
|
||
;; the B version (execute b-version), or
|
||
;; empty (execute neither-version), or
|
||
;; argument FORCE is true (execute neither-version)
|
||
;; Otherwise, signal an error.
|
||
(defun emerge-select-version (force a-version b-version neither-version)
|
||
(emerge-validate-difference)
|
||
(let ((buffer-read-only nil))
|
||
(let* ((diff-vector
|
||
(aref emerge-difference-list emerge-current-difference))
|
||
(A-begin (1+ (aref diff-vector 0)))
|
||
(A-end (1- (aref diff-vector 1)))
|
||
(B-begin (1+ (aref diff-vector 2)))
|
||
(B-end (1- (aref diff-vector 3)))
|
||
(merge-begin (1+ (aref diff-vector 4)))
|
||
(merge-end (1- (aref diff-vector 5))))
|
||
(if (emerge-compare-buffers emerge-A-buffer A-begin A-end
|
||
emerge-merge-buffer merge-begin
|
||
merge-end)
|
||
(funcall a-version)
|
||
(if (emerge-compare-buffers emerge-B-buffer B-begin B-end
|
||
emerge-merge-buffer merge-begin
|
||
merge-end)
|
||
(funcall b-version)
|
||
(if (or force (= merge-begin merge-end))
|
||
(funcall neither-version)
|
||
(error "This difference region has been edited.")))))))
|
||
|
||
;; Revise the mode line to display which difference we have selected
|
||
|
||
(defun emerge-refresh-mode-line ()
|
||
(setq mode-line-buffer-identification
|
||
(list (format "Emerge: %%b diff %d of %d%s"
|
||
(1+ emerge-current-difference)
|
||
emerge-number-of-differences
|
||
(if (and (>= emerge-current-difference 0)
|
||
(< emerge-current-difference
|
||
emerge-number-of-differences))
|
||
(cdr (assq (aref (aref emerge-difference-list
|
||
emerge-current-difference)
|
||
6)
|
||
'((A . " - A")
|
||
(B . " - B")
|
||
(prefer-A . " - A*")
|
||
(prefer-B . " - B*")
|
||
(combined . " - comb"))))
|
||
""))))
|
||
;; Force mode-line redisplay
|
||
(set-buffer-modified-p (buffer-modified-p)))
|
||
|
||
;; compare two regions in two buffers for containing the same text
|
||
(defun emerge-compare-buffers (buffer-x x-begin x-end buffer-y y-begin y-end)
|
||
;; first check that the two regions are the same length
|
||
(if (not (and (= (- x-end x-begin) (- y-end y-begin))))
|
||
nil
|
||
(catch 'exit
|
||
(while (< x-begin x-end)
|
||
;; bite off and compare no more than 1000 characters at a time
|
||
(let* ((compare-length (min (- x-end x-begin) 1000))
|
||
(x-string (emerge-eval-in-buffer
|
||
buffer-x
|
||
(buffer-substring x-begin
|
||
(+ x-begin compare-length))))
|
||
(y-string (emerge-eval-in-buffer
|
||
buffer-y
|
||
(buffer-substring y-begin
|
||
(+ y-begin compare-length)))))
|
||
(if (not (string-equal x-string y-string))
|
||
(throw 'exit nil)
|
||
(setq x-begin (+ x-begin compare-length))
|
||
(setq y-begin (+ y-begin compare-length)))))
|
||
t)))
|
||
|
||
;; Construct a unique buffer name.
|
||
;; The first one tried is prefixsuffix, then prefix<2>suffix,
|
||
;; prefix<3>suffix, etc.
|
||
(defun emerge-unique-buffer-name (prefix suffix)
|
||
(if (null (get-buffer (concat prefix suffix)))
|
||
(concat prefix suffix)
|
||
(let ((n 2))
|
||
(while (get-buffer (format "%s<%d>%s" prefix n suffix))
|
||
(setq n (1+ n)))
|
||
(format "%s<%d>%s" prefix n suffix))))
|
||
|
||
;; Verify that we have a difference selected.
|
||
(defun emerge-validate-difference ()
|
||
(if (not (and (>= emerge-current-difference 0)
|
||
(< emerge-current-difference emerge-number-of-differences)))
|
||
(error "No difference selected")))
|
||
|
||
;;; Functions for saving and restoring a batch of variables
|
||
|
||
;; These functions save (get the values of) and restore (set the values of)
|
||
;; a list of variables. The argument is a list of symbols (the names of
|
||
;; the variables). A list element can also be a list of two functions,
|
||
;; the first of which (when called with no arguments) gets the value, and
|
||
;; the second (when called with a value as an argment) sets the value.
|
||
;; A "function" is anything that funcall can handle as an argument.
|
||
|
||
(defun emerge-save-variables (vars)
|
||
(mapcar (function (lambda (v) (if (symbolp v)
|
||
(symbol-value v)
|
||
(funcall (car v)))))
|
||
vars))
|
||
|
||
(defun emerge-restore-variables (vars values)
|
||
(while vars
|
||
(let ((var (car vars))
|
||
(value (car values)))
|
||
(if (symbolp var)
|
||
(set var value)
|
||
(funcall (car (cdr var)) value)))
|
||
(setq vars (cdr vars))
|
||
(setq values (cdr values))))
|
||
|
||
;; Make a temporary file that only we have access to.
|
||
;; PREFIX is appended to emerge-temp-file-prefix to make the filename prefix.
|
||
(defun emerge-make-temp-file (prefix)
|
||
(let ((f (make-temp-name (concat emerge-temp-file-prefix prefix))))
|
||
;; create the file
|
||
(write-region (point-min) (point-min) f nil 'no-message)
|
||
(set-file-modes f emerge-temp-file-mode)
|
||
f))
|
||
|
||
;;; Functions that query the user before he can write out the current buffer.
|
||
|
||
(defun emerge-query-write-file ()
|
||
"Query the user if he really wants to write out the incomplete merge.
|
||
If he says yes, call `write-file' to do so. See `emerge-query-and-call'
|
||
for details of the querying process."
|
||
(interactive)
|
||
(emerge-query-and-call 'write-file))
|
||
|
||
(defun emerge-query-save-buffer ()
|
||
"Query the user if he really wants to write out the incomplete merge.
|
||
If he says yes, call `save-buffer' to do so. See `emerge-query-and-call'
|
||
for details of the querying process."
|
||
(interactive)
|
||
(emerge-query-and-call 'save-buffer))
|
||
|
||
(defun emerge-query-and-call (command)
|
||
"Query the user if he really wants to write out the incomplete merge.
|
||
If he says yes, call COMMAND interactively. During the call, the flags
|
||
around the current difference are removed."
|
||
(if (yes-or-no-p "Do you really write to write out this unfinished merge? ")
|
||
;; He really wants to do it -- unselect the difference for the duration
|
||
(progn
|
||
(if (and (>= emerge-current-difference 0)
|
||
(< emerge-current-difference emerge-number-of-differences))
|
||
(emerge-unselect-difference emerge-current-difference))
|
||
;; call-interactively takes the value of current-prefix-arg as the
|
||
;; prefix argument value to be passed to the command. Thus, we have
|
||
;; to do nothing special to make sure the prefix argument is
|
||
;; transmitted to the command.
|
||
(call-interactively command)
|
||
(if (and (>= emerge-current-difference 0)
|
||
(< emerge-current-difference emerge-number-of-differences))
|
||
(progn
|
||
(emerge-select-difference emerge-current-difference)
|
||
(emerge-recenter))))
|
||
;; He's being smart and not doing it
|
||
(message "Not written")))
|
||
|
||
;; Make sure the current buffer (for a file) has the same contents as the
|
||
;; file on disk, and attempt to remedy the situation if not.
|
||
;; Signal an error if we can't make them the same, or the user doesn't want
|
||
;; to do what is necessary to make them the same.
|
||
(defun emerge-verify-file-buffer ()
|
||
;; First check if the file has been modified since the buffer visited it.
|
||
(if (verify-visited-file-modtime (current-buffer))
|
||
(if (buffer-modified-p)
|
||
;; If buffer is not obsolete and is modified, offer to save
|
||
(if (yes-or-no-p (format "Save file %s? " buffer-file-name))
|
||
(save-buffer)
|
||
(error "Buffer out of sync for file %s" buffer-file-name))
|
||
;; If buffer is not obsolete and is not modified, do nothing
|
||
nil)
|
||
(if (buffer-modified-p)
|
||
;; If buffer is obsolete and is modified, give error
|
||
(error "Buffer out of sync for file %s" buffer-file-name)
|
||
;; If buffer is obsolete and is not modified, offer to revert
|
||
(if (yes-or-no-p (format "Revert file %s? " buffer-file-name))
|
||
(revert-buffer t t)
|
||
(error "Buffer out of sync for file %s" buffer-file-name)))))
|
||
|
||
;; Utilities that might have value outside of Emerge.
|
||
|
||
;; Set up the mode in the current buffer to duplicate the mode in another
|
||
;; buffer.
|
||
(defun emerge-copy-modes (buffer)
|
||
;; Set the major mode
|
||
(funcall (emerge-eval-in-buffer buffer major-mode)))
|
||
|
||
;; Define a key, even if a prefix of it is defined
|
||
(defun emerge-force-define-key (keymap key definition)
|
||
"Like `define-key', but isn't stopped if a prefix of KEY is a defined
|
||
command."
|
||
;; Find out if a prefix of key is defined
|
||
(let ((v (lookup-key keymap key)))
|
||
;; If so, undefine it
|
||
(if (integerp v)
|
||
(define-key keymap (substring key 0 v) nil)))
|
||
;; Now define the key
|
||
(define-key keymap key definition))
|
||
|
||
;;; Improvements to describe-mode, so that it describes minor modes as well
|
||
;;; as the major mode
|
||
(defun describe-mode (&optional minor)
|
||
"Display documentation of current major mode.
|
||
If optional MINOR is non-nil (or prefix argument is given if interactive),
|
||
display documentation of acive minor modes as well.
|
||
For this to work correctly for a minor mode, the mode's indicator variable
|
||
(listed in `minor-mode-alist') must also be a function whose documentation
|
||
describes the minor mode."
|
||
(interactive)
|
||
(with-output-to-temp-buffer "*Help*"
|
||
(princ mode-name)
|
||
(princ " Mode:\n")
|
||
(princ (documentation major-mode))
|
||
(let ((minor-modes minor-mode-alist)
|
||
(locals (buffer-local-variables)))
|
||
(while minor-modes
|
||
(let* ((minor-mode (car (car minor-modes)))
|
||
(indicator (car (cdr (car minor-modes))))
|
||
(local-binding (assq minor-mode locals)))
|
||
;; Document a minor mode if it is listed in minor-mode-alist,
|
||
;; bound locally in this buffer, non-nil, and has a function
|
||
;; definition.
|
||
(if (and local-binding
|
||
(cdr local-binding)
|
||
(fboundp minor-mode))
|
||
(progn
|
||
(princ (format "\n\n\n%s minor mode (indicator%s):\n"
|
||
minor-mode indicator))
|
||
(princ (documentation minor-mode)))))
|
||
(setq minor-modes (cdr minor-modes))))
|
||
(print-help-return-message)))
|
||
|
||
;; Adjust things so that keyboard macro definitions are documented correctly.
|
||
(fset 'defining-kbd-macro (symbol-function 'start-kbd-macro))
|
||
|
||
;; Function to shadow a definition in a keymap with definitions in another.
|
||
(defun emerge-shadow-key-definition (olddef newdef keymap shadowmap)
|
||
"Shadow OLDDEF with NEWDEF for any keys in KEYMAP with entries in SHADOWMAP.
|
||
In other words, SHADOWMAP will now shadow all definitions of OLDDEF in KEYMAP
|
||
with NEWDEF. Does not affect keys that are already defined in SHADOWMAP,
|
||
including those whose definition is OLDDEF."
|
||
;; loop through all keymaps accessible from keymap
|
||
(let ((maps (accessible-keymaps keymap)))
|
||
(while maps
|
||
(let ((prefix (car (car maps)))
|
||
(map (cdr (car maps))))
|
||
;; examine a keymap
|
||
(if (arrayp map)
|
||
;; array keymap
|
||
(let ((len (length map))
|
||
(i 0))
|
||
(while (< i len)
|
||
(if (eq (aref map i) olddef)
|
||
;; set the shadowing definition
|
||
(let ((key (concat prefix (char-to-string i))))
|
||
(emerge-define-key-if-possible shadowmap key newdef)))
|
||
(setq i (1+ i))))
|
||
;; sparse keymap
|
||
(while map
|
||
(if (eq (cdr-safe (car-safe map)) olddef)
|
||
;; set the shadowing definition
|
||
(let ((key
|
||
(concat prefix (char-to-string (car (car map))))))
|
||
(emerge-define-key-if-possible shadowmap key newdef)))
|
||
(setq map (cdr map)))))
|
||
(setq maps (cdr maps)))))
|
||
|
||
;; Define a key if it (or a prefix) is not already defined in the map.
|
||
(defun emerge-define-key-if-possible (keymap key definition)
|
||
;; look up the present definition of the key
|
||
(let ((present (lookup-key keymap key)))
|
||
(if (integerp present)
|
||
;; if it is "too long", look up the valid prefix
|
||
(if (not (lookup-key keymap (substring key 0 present)))
|
||
;; if the prefix isn't defined, define it
|
||
(define-key keymap key definition))
|
||
;; if there is no present definition, define it
|
||
(if (not present)
|
||
(define-key keymap key definition)))))
|
||
|
||
(defun emerge-recursively-substitute-key-definition (olddef newdef keymap)
|
||
"Like `substitute-key-definition', but examines and substitutes in all
|
||
keymaps accessible from KEYMAP. Make sure that subordinate keymaps aren't
|
||
shared with other keymaps! (`copy-keymap' will suffice.)"
|
||
;; Loop through all keymaps accessible from keymap
|
||
(let ((maps (accessible-keymaps keymap)))
|
||
(while maps
|
||
;; Substitute in this keymap
|
||
(substitute-key-definition olddef newdef (cdr (car maps)))
|
||
(setq maps (cdr maps)))))
|
||
|
||
;; Show the name of the file in the buffer.
|
||
(defun emerge-show-file-name ()
|
||
"Displays the name of the file loaded into the current buffer.
|
||
If the name won't fit on one line, the minibuffer is expanded to hold it,
|
||
and the command waits for a keystroke from the user. If the keystroke is
|
||
SPC, it is ignored; if it is anything else, it is processed as a command."
|
||
(interactive)
|
||
(let ((name (buffer-file-name)))
|
||
(or name
|
||
(setq name "Buffer has no file name."))
|
||
(save-window-excursion
|
||
(select-window (minibuffer-window))
|
||
(erase-buffer)
|
||
(insert name)
|
||
(if (not (pos-visible-in-window-p))
|
||
(let ((echo-keystrokes 0))
|
||
(while (and (not (pos-visible-in-window-p))
|
||
(> (1- (frame-height)) (window-height)))
|
||
(enlarge-window 1))
|
||
(let ((c (read-event)))
|
||
(if (not (eq c 32))
|
||
(setq unread-command-events (list c)))))))))
|
||
|
||
;; Improved auto-save file names.
|
||
;; This function fixes many problems with the standard auto-save file names:
|
||
;; Auto-save files for non-file buffers get put in the default directory
|
||
;; for the buffer, whether that makes sense or not.
|
||
;; Auto-save files for file buffers get put in the directory of the file,
|
||
;; regardless of whether we can write into it or not.
|
||
;; Auto-save files for non-file buffers don't use the process id, so if a
|
||
;; user runs more than on Emacs, they can make auto-save files that overwrite
|
||
;; each other.
|
||
;; To use this function, do:
|
||
;; (fset 'make-auto-save-file-name
|
||
;; (symbol-function 'emerge-make-auto-save-file-name))
|
||
(defun emerge-make-auto-save-file-name ()
|
||
"Return file name to use for auto-saves of current buffer.
|
||
Does not consider auto-save-visited-file-name; that is checked
|
||
before calling this function.
|
||
You can redefine this for customization.
|
||
See also auto-save-file-name-p."
|
||
(if buffer-file-name
|
||
;; if buffer has a file, try the format <file directory>/#<file name>#
|
||
(let ((f (concat (file-name-directory buffer-file-name)
|
||
"#"
|
||
(file-name-nondirectory buffer-file-name)
|
||
"#")))
|
||
(if (file-writable-p f)
|
||
;; the file is writable, so use it
|
||
f
|
||
;; the file isn't writable, so use the format
|
||
;; ~/#&<file name>&<hash of directory>#
|
||
(concat (getenv "HOME")
|
||
"/#&"
|
||
(file-name-nondirectory buffer-file-name)
|
||
"&"
|
||
(hash-string-into-string
|
||
(file-name-directory buffer-file-name))
|
||
"#")))
|
||
;; if buffer has no file, use the format ~/#%<buffer name>%<process id>#
|
||
(expand-file-name (concat (getenv "HOME")
|
||
"/#%"
|
||
;; quote / into \! and \ into \\
|
||
(unslashify-name (buffer-name))
|
||
"%"
|
||
(make-temp-name "")
|
||
"#"))))
|
||
|
||
;; Hash a string into five characters more-or-less suitable for use in a file
|
||
;; name. (Allowed characters are ! through ~, except /.)
|
||
(defun hash-string-into-string (s)
|
||
(let ((bins (vector 0 0 0 0 0))
|
||
(i 0))
|
||
(while (< i (length s))
|
||
(aset bins (% i 5) (% (+ (* (aref bins (% i 5)) 35)
|
||
(aref s i))
|
||
65536))
|
||
(setq i (1+ i)))
|
||
(mapconcat (function (lambda (b)
|
||
(setq b (+ (% b 93) ?!))
|
||
(if (>= b ?/)
|
||
(setq b (1+ b)))
|
||
(char-to-string b)))
|
||
bins "")))
|
||
|
||
;; Quote any /s in a string by replacing them with \!.
|
||
;; Also, replace any \s by \\, to make it one-to-one.
|
||
(defun unslashify-name (s)
|
||
(let ((limit 0))
|
||
(while (string-match "[/\\]" s limit)
|
||
(setq s (concat (substring s 0 (match-beginning 0))
|
||
(if (string= (substring s (match-beginning 0)
|
||
(match-end 0))
|
||
"/")
|
||
"\\!"
|
||
"\\\\")
|
||
(substring s (match-end 0))))
|
||
(setq limit (1+ (match-end 0)))))
|
||
s)
|
||
|
||
(provide 'emerge)
|
||
|
||
;;; emerge.el ends here
|