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emacs/lisp/smerge-mode.el
Stefan Monnier cc1eecfd88 Update my email address.
2006-04-30 15:49:08 +00:00

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;;; smerge-mode.el --- Minor mode to resolve diff3 conflicts
;; Copyright (C) 1999, 2000, 2001, 2002, 2003,
;; 2004, 2005, 2006 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: tools revision-control merge diff3 cvs conflict
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Provides a lightweight alternative to emerge/ediff.
;; To use it, simply add to your .emacs the following lines:
;;
;; (autoload 'smerge-mode "smerge-mode" nil t)
;;
;; you can even have it turned on automatically with the following
;; piece of code in your .emacs:
;;
;; (defun sm-try-smerge ()
;; (save-excursion
;; (goto-char (point-min))
;; (when (re-search-forward "^<<<<<<< " nil t)
;; (smerge-mode 1))))
;; (add-hook 'find-file-hook 'sm-try-smerge t)
;;; Todo:
;; - if requested, ask the user whether he wants to call ediff right away
;;; Code:
(eval-when-compile (require 'cl))
;;; The real definition comes later.
(defvar smerge-mode)
(defgroup smerge ()
"Minor mode to highlight and resolve diff3 conflicts."
:group 'tools
:prefix "smerge-")
(defcustom smerge-diff-buffer-name "*vc-diff*"
"Buffer name to use for displaying diffs."
:group 'smerge
:type '(choice
(const "*vc-diff*")
(const "*cvs-diff*")
(const "*smerge-diff*")
string))
(defcustom smerge-diff-switches
(append '("-d" "-b")
(if (listp diff-switches) diff-switches (list diff-switches)))
"A list of strings specifying switches to be passed to diff.
Used in `smerge-diff-base-mine' and related functions."
:group 'smerge
:type '(repeat string))
(defcustom smerge-auto-leave t
"Non-nil means to leave `smerge-mode' when the last conflict is resolved."
:group 'smerge
:type 'boolean)
(defface smerge-mine
'((((min-colors 88) (background light))
(:foreground "blue1"))
(((background light))
(:foreground "blue"))
(((min-colors 88) (background dark))
(:foreground "cyan1"))
(((background dark))
(:foreground "cyan")))
"Face for your code."
:group 'smerge)
;; backward-compatibility alias
(put 'smerge-mine-face 'face-alias 'smerge-mine)
(defvar smerge-mine-face 'smerge-mine)
(defface smerge-other
'((((background light))
(:foreground "darkgreen"))
(((background dark))
(:foreground "lightgreen")))
"Face for the other code."
:group 'smerge)
;; backward-compatibility alias
(put 'smerge-other-face 'face-alias 'smerge-other)
(defvar smerge-other-face 'smerge-other)
(defface smerge-base
'((((min-colors 88) (background light))
(:foreground "red1"))
(((background light))
(:foreground "red"))
(((background dark))
(:foreground "orange")))
"Face for the base code."
:group 'smerge)
;; backward-compatibility alias
(put 'smerge-base-face 'face-alias 'smerge-base)
(defvar smerge-base-face 'smerge-base)
(defface smerge-markers
'((((background light))
(:background "grey85"))
(((background dark))
(:background "grey30")))
"Face for the conflict markers."
:group 'smerge)
;; backward-compatibility alias
(put 'smerge-markers-face 'face-alias 'smerge-markers)
(defvar smerge-markers-face 'smerge-markers)
(defface smerge-refined-change
'((t :background "yellow"))
"Face used for char-based changes shown by `smerge-refine'."
:group 'smerge)
(easy-mmode-defmap smerge-basic-map
`(("n" . smerge-next)
("p" . smerge-prev)
("r" . smerge-resolve)
("a" . smerge-keep-all)
("b" . smerge-keep-base)
("o" . smerge-keep-other)
("m" . smerge-keep-mine)
("E" . smerge-ediff)
("C" . smerge-combine-with-next)
("R" . smerge-refine)
("\C-m" . smerge-keep-current)
("=" . ,(make-sparse-keymap "Diff"))
("=<" "base-mine" . smerge-diff-base-mine)
("=>" "base-other" . smerge-diff-base-other)
("==" "mine-other" . smerge-diff-mine-other))
"The base keymap for `smerge-mode'.")
(defcustom smerge-command-prefix "\C-c^"
"Prefix for `smerge-mode' commands."
:group 'smerge
:type '(choice (string "\e") (string "\C-c^") (string "") string))
(easy-mmode-defmap smerge-mode-map
`((,smerge-command-prefix . ,smerge-basic-map))
"Keymap for `smerge-mode'.")
(defvar smerge-check-cache nil)
(make-variable-buffer-local 'smerge-check-cache)
(defun smerge-check (n)
(condition-case nil
(let ((state (cons (point) (buffer-modified-tick))))
(unless (equal (cdr smerge-check-cache) state)
(smerge-match-conflict)
(setq smerge-check-cache (cons (match-data) state)))
(nth (* 2 n) (car smerge-check-cache)))
(error nil)))
(easy-menu-define smerge-mode-menu smerge-mode-map
"Menu for `smerge-mode'."
'("SMerge"
["Next" smerge-next :help "Go to next conflict"]
["Previous" smerge-prev :help "Go to previous conflict"]
"--"
["Keep All" smerge-keep-all :help "Keep all three versions"
:active (smerge-check 1)]
["Keep Current" smerge-keep-current :help "Use current (at point) version"
:active (and (smerge-check 1) (> (smerge-get-current) 0))]
"--"
["Revert to Base" smerge-keep-base :help "Revert to base version"
:active (smerge-check 2)]
["Keep Other" smerge-keep-other :help "Keep `other' version"
:active (smerge-check 3)]
["Keep Yours" smerge-keep-mine :help "Keep your version"
:active (smerge-check 1)]
"--"
["Diff Base/Mine" smerge-diff-base-mine
:help "Diff `base' and `mine' for current conflict"
:active (smerge-check 2)]
["Diff Base/Other" smerge-diff-base-other
:help "Diff `base' and `other' for current conflict"
:active (smerge-check 2)]
["Diff Mine/Other" smerge-diff-mine-other
:help "Diff `mine' and `other' for current conflict"
:active (smerge-check 1)]
"--"
["Invoke Ediff" smerge-ediff
:help "Use Ediff to resolve the conflicts"
:active (smerge-check 1)]
["Auto Resolve" smerge-resolve
:help "Try auto-resolution heuristics"
:active (smerge-check 1)]
["Combine" smerge-combine-with-next
:help "Combine current conflict with next"
:active (smerge-check 1)]
))
(easy-menu-define smerge-context-menu nil
"Context menu for mine area in `smerge-mode'."
'(nil
["Keep Current" smerge-keep-current :help "Use current (at point) version"]
["Kill Current" smerge-kill-current :help "Remove current (at point) version"]
["Keep All" smerge-keep-all :help "Keep all three versions"]
"---"
["More..." (popup-menu smerge-mode-menu) :help "Show full SMerge mode menu"]
))
(defconst smerge-font-lock-keywords
'((smerge-find-conflict
(1 smerge-mine-face prepend t)
(2 smerge-base-face prepend t)
(3 smerge-other-face prepend t)
;; FIXME: `keep' doesn't work right with syntactic fontification.
(0 smerge-markers-face keep)
(4 nil t t)
(5 nil t t)))
"Font lock patterns for `smerge-mode'.")
(defconst smerge-begin-re "^<<<<<<< \\(.*\\)\n")
(defconst smerge-end-re "^>>>>>>> .*\n")
(defconst smerge-base-re "^||||||| .*\n")
(defconst smerge-other-re "^=======\n")
(defvar smerge-conflict-style nil
"Keep track of which style of conflict is in use.
Can be nil if the style is undecided, or else:
- `diff3-E'
- `diff3-A'")
;; Compiler pacifiers
(defvar font-lock-mode)
(defvar font-lock-keywords)
;;;;
;;;; Actual code
;;;;
;; Define smerge-next and smerge-prev
(easy-mmode-define-navigation smerge smerge-begin-re "conflict")
(defconst smerge-match-names ["conflict" "mine" "base" "other"])
(defun smerge-ensure-match (n)
(unless (match-end n)
(error "No `%s'" (aref smerge-match-names n))))
(defun smerge-auto-leave ()
(when (and smerge-auto-leave
(save-excursion (goto-char (point-min))
(not (re-search-forward smerge-begin-re nil t))))
(when (and (listp buffer-undo-list) smerge-mode)
(push (list 'apply 'smerge-mode 1) buffer-undo-list))
(smerge-mode -1)))
(defun smerge-keep-all ()
"Concatenate all versions."
(interactive)
(smerge-match-conflict)
(let ((mb2 (or (match-beginning 2) (point-max)))
(me2 (or (match-end 2) (point-min))))
(delete-region (match-end 3) (match-end 0))
(delete-region (max me2 (match-end 1)) (match-beginning 3))
(if (and (match-end 2) (/= (match-end 1) (match-end 3)))
(delete-region (match-end 1) (match-beginning 2)))
(delete-region (match-beginning 0) (min (match-beginning 1) mb2))
(smerge-auto-leave)))
(defun smerge-keep-n (n)
(smerge-remove-props (match-beginning 0) (match-end 0))
;; We used to use replace-match, but that did not preserve markers so well.
(delete-region (match-end n) (match-end 0))
(delete-region (match-beginning 0) (match-beginning n)))
(defun smerge-combine-with-next ()
"Combine the current conflict with the next one."
(interactive)
(smerge-match-conflict)
(let ((ends nil))
(dolist (i '(3 2 1 0))
(push (if (match-end i) (copy-marker (match-end i) t)) ends))
(setq ends (apply 'vector ends))
(goto-char (aref ends 0))
(if (not (re-search-forward smerge-begin-re nil t))
(error "No next conflict")
(smerge-match-conflict)
(let ((match-data (mapcar (lambda (m) (if m (copy-marker m)))
(match-data))))
;; First copy the in-between text in each alternative.
(dolist (i '(1 2 3))
(when (aref ends i)
(goto-char (aref ends i))
(insert-buffer-substring (current-buffer)
(aref ends 0) (car match-data))))
(delete-region (aref ends 0) (car match-data))
;; Then move the second conflict's alternatives into the first.
(dolist (i '(1 2 3))
(set-match-data match-data)
(when (and (aref ends i) (match-end i))
(goto-char (aref ends i))
(insert-buffer-substring (current-buffer)
(match-beginning i) (match-end i))))
(delete-region (car match-data) (cadr match-data))
;; Free the markers.
(dolist (m match-data) (if m (move-marker m nil)))
(mapc (lambda (m) (if m (move-marker m nil))) ends)))))
(defvar smerge-resolve-function
(lambda () (error "Don't know how to resolve"))
"Mode-specific merge function.
The function is called with no argument and with the match data set
according to `smerge-match-conflict'.")
(add-to-list 'debug-ignored-errors "Don't know how to resolve")
(defvar smerge-text-properties
`(help-echo "merge conflict: mouse-3 shows a menu"
;; mouse-face highlight
keymap (keymap (down-mouse-3 . smerge-popup-context-menu))))
(defun smerge-remove-props (beg end)
(remove-overlays beg end 'smerge 'refine)
(remove-overlays beg end 'smerge 'conflict)
;; Now that we use overlays rather than text-properties, this function
;; does not cause refontification any more. It can be seen very clearly
;; in buffers where jit-lock-contextually is not t, in which case deleting
;; the "<<<<<<< foobar" leading line leaves the rest of the conflict
;; highlighted as if it were still a valid conflict. Note that in many
;; important cases (such as the previous example) we're actually called
;; during font-locking so inhibit-modification-hooks is non-nil, so we
;; can't just modify the buffer and expect font-lock to be triggered as in:
;; (put-text-property beg end 'smerge-force-highlighting nil)
(remove-text-properties beg end '(fontified nil)))
(defun smerge-popup-context-menu (event)
"Pop up the Smerge mode context menu under mouse."
(interactive "e")
(if (and smerge-mode
(save-excursion (posn-set-point (event-end event)) (smerge-check 1)))
(progn
(posn-set-point (event-end event))
(smerge-match-conflict)
(let ((i (smerge-get-current))
o)
(if (<= i 0)
;; Out of range
(popup-menu smerge-mode-menu)
;; Install overlay.
(setq o (make-overlay (match-beginning i) (match-end i)))
(unwind-protect
(progn
(overlay-put o 'face 'highlight)
(sit-for 0) ;Display the new highlighting.
(popup-menu smerge-context-menu))
;; Delete overlay.
(delete-overlay o)))))
;; There's no conflict at point, the text-props are just obsolete.
(save-excursion
(let ((beg (re-search-backward smerge-end-re nil t))
(end (re-search-forward smerge-begin-re nil t)))
(smerge-remove-props (or beg (point-min)) (or end (point-max)))
(push event unread-command-events)))))
(defun smerge-resolve ()
"Resolve the conflict at point intelligently.
This relies on mode-specific knowledge and thus only works in
some major modes. Uses `smerge-resolve-function' to do the actual work."
(interactive)
(smerge-match-conflict)
(smerge-remove-props (match-beginning 0) (match-end 0))
(cond
;; Trivial diff3 -A non-conflicts.
((and (eq (match-end 1) (match-end 3))
(eq (match-beginning 1) (match-beginning 3)))
(smerge-keep-n 3))
;; Mode-specific conflict resolution.
((condition-case nil
(atomic-change-group
(funcall smerge-resolve-function)
t)
(error nil))
;; Nothing to do: the resolution function has done it already.
nil)
;; FIXME: Add "if [ diff -b MINE OTHER ]; then select OTHER; fi"
((and (match-end 2)
;; FIXME: Add "diff -b BASE MINE | patch OTHER".
;; FIXME: Add "diff -b BASE OTHER | patch MINE".
nil)
)
((and (not (match-end 2))
;; FIXME: Add "diff -b"-based refinement.
nil)
)
(t
(error "Don't know how to resolve")))
(smerge-auto-leave))
(defun smerge-keep-base ()
"Revert to the base version."
(interactive)
(smerge-match-conflict)
(smerge-ensure-match 2)
(smerge-keep-n 2)
(smerge-auto-leave))
(defun smerge-keep-other ()
"Use \"other\" version."
(interactive)
(smerge-match-conflict)
;;(smerge-ensure-match 3)
(smerge-keep-n 3)
(smerge-auto-leave))
(defun smerge-keep-mine ()
"Keep your version."
(interactive)
(smerge-match-conflict)
;;(smerge-ensure-match 1)
(smerge-keep-n 1)
(smerge-auto-leave))
(defun smerge-get-current ()
(let ((i 3))
(while (or (not (match-end i))
(< (point) (match-beginning i))
(>= (point) (match-end i)))
(decf i))
i))
(defun smerge-keep-current ()
"Use the current (under the cursor) version."
(interactive)
(smerge-match-conflict)
(let ((i (smerge-get-current)))
(if (<= i 0) (error "Not inside a version")
(smerge-keep-n i)
(smerge-auto-leave))))
(defun smerge-kill-current ()
"Remove the current (under the cursor) version."
(interactive)
(smerge-match-conflict)
(let ((i (smerge-get-current)))
(if (<= i 0) (error "Not inside a version")
(let ((left nil))
(dolist (n '(3 2 1))
(if (and (match-end n) (/= (match-end n) (match-end i)))
(push n left)))
(if (and (cdr left)
(/= (match-end (car left)) (match-end (cadr left))))
(ding) ;We don't know how to do that.
(smerge-keep-n (car left))
(smerge-auto-leave))))))
(defun smerge-diff-base-mine ()
"Diff 'base' and 'mine' version in current conflict region."
(interactive)
(smerge-diff 2 1))
(defun smerge-diff-base-other ()
"Diff 'base' and 'other' version in current conflict region."
(interactive)
(smerge-diff 2 3))
(defun smerge-diff-mine-other ()
"Diff 'mine' and 'other' version in current conflict region."
(interactive)
(smerge-diff 1 3))
(defun smerge-match-conflict ()
"Get info about the conflict. Puts the info in the `match-data'.
The submatches contain:
0: the whole conflict.
1: your code.
2: the base code.
3: other code.
An error is raised if not inside a conflict."
(save-excursion
(condition-case nil
(let* ((orig-point (point))
(_ (forward-line 1))
(_ (re-search-backward smerge-begin-re))
(start (match-beginning 0))
(mine-start (match-end 0))
(filename (or (match-string 1) ""))
(_ (re-search-forward smerge-end-re))
(_ (assert (< orig-point (match-end 0))))
(other-end (match-beginning 0))
(end (match-end 0))
(_ (re-search-backward smerge-other-re start))
(mine-end (match-beginning 0))
(other-start (match-end 0))
base-start base-end)
;; handle the various conflict styles
(cond
((save-excursion
(goto-char mine-start)
(re-search-forward smerge-begin-re end t))
;; There's a nested conflict and we're after the the beginning
;; of the outer one but before the beginning of the inner one.
;; Of course, maybe this is not a nested conflict but in that
;; case it can only be something nastier that we don't know how
;; to handle, so may as well arbitrarily decide to treat it as
;; a nested conflict. --Stef
(error "There is a nested conflict"))
((re-search-backward smerge-base-re start t)
;; a 3-parts conflict
(set (make-local-variable 'smerge-conflict-style) 'diff3-A)
(setq base-end mine-end)
(setq mine-end (match-beginning 0))
(setq base-start (match-end 0)))
((string= filename (file-name-nondirectory
(or buffer-file-name "")))
;; a 2-parts conflict
(set (make-local-variable 'smerge-conflict-style) 'diff3-E))
((and (not base-start)
(or (eq smerge-conflict-style 'diff3-A)
(equal filename "ANCESTOR")
(string-match "\\`[.0-9]+\\'" filename)))
;; a same-diff conflict
(setq base-start mine-start)
(setq base-end mine-end)
(setq mine-start other-start)
(setq mine-end other-end)))
(store-match-data (list start end
mine-start mine-end
base-start base-end
other-start other-end
(when base-start (1- base-start)) base-start
(1- other-start) other-start))
t)
(search-failed (error "Point not in conflict region")))))
(defun smerge-conflict-overlay (pos)
"Return the conflict overlay at POS if any."
(let ((ols (overlays-at pos))
conflict)
(dolist (ol ols)
(if (and (eq (overlay-get ol 'smerge) 'conflict)
(> (overlay-end ol) pos))
(setq conflict ol)))
conflict))
(defun smerge-find-conflict (&optional limit)
"Find and match a conflict region. Intended as a font-lock MATCHER.
The submatches are the same as in `smerge-match-conflict'.
Returns non-nil if a match is found between point and LIMIT.
Point is moved to the end of the conflict."
(let ((found nil)
(pos (point))
conflict)
;; First check to see if point is already inside a conflict, using
;; the conflict overlays.
(while (and (not found) (setq conflict (smerge-conflict-overlay pos)))
;; Check the overlay's validity and kill it if it's out of date.
(condition-case nil
(progn
(goto-char (overlay-start conflict))
(smerge-match-conflict)
(goto-char (match-end 0))
(if (<= (point) pos)
(error "Matching backward!")
(setq found t)))
(error (smerge-remove-props
(overlay-start conflict) (overlay-end conflict))
(goto-char pos))))
;; If we're not already inside a conflict, look for the next conflict
;; and add/update its overlay.
(while (and (not found) (re-search-forward smerge-begin-re limit t))
(condition-case nil
(progn
(smerge-match-conflict)
(goto-char (match-end 0))
(let ((conflict (smerge-conflict-overlay (1- (point)))))
(if conflict
;; Update its location, just in case it got messed up.
(move-overlay conflict (match-beginning 0) (match-end 0))
(setq conflict (make-overlay (match-beginning 0) (match-end 0)
nil 'front-advance nil))
(overlay-put conflict 'evaporate t)
(overlay-put conflict 'smerge 'conflict)
(let ((props smerge-text-properties))
(while props
(overlay-put conflict (pop props) (pop props))))))
(setq found t))
(error nil)))
found))
(defun smerge-refine-chopup-region (beg end file)
"Chopup the region into small elements, one per line."
;; ediff chops up into words, where the definition of a word is
;; customizable. Instead we here keep only one char per line.
;; The advantages are that there's nothing to configure, that we get very
;; fine results, and that it's trivial to map the line numbers in the
;; output of diff back into buffer positions. The disadvantage is that it
;; can take more time to compute the diff and that the result is sometimes
;; too fine. I'm not too concerned about the slowdown because conflicts
;; are usually significantly smaller than the whole file. As for the
;; problem of too-fine-refinement, I have found it to be unimportant
;; especially when you consider the cases where the fine-grain is just
;; what you want.
(let ((buf (current-buffer)))
(with-temp-buffer
(insert-buffer-substring buf beg end)
(goto-char (point-min))
(while (not (eobp))
(forward-char 1)
(unless (eq (char-before) ?\n) (insert ?\n)))
(let ((coding-system-for-write 'emacs-mule))
(write-region (point-min) (point-max) file nil 'nomessage)))))
(defun smerge-refine-highlight-change (buf beg match-num1 match-num2)
(let* ((startline (string-to-number (match-string match-num1)))
(ol (make-overlay
(+ beg startline -1)
(+ beg (if (match-end match-num2)
(string-to-number (match-string match-num2))
startline))
buf
'front-advance nil)))
(overlay-put ol 'smerge 'refine)
(overlay-put ol 'evaporate t)
(overlay-put ol 'face 'smerge-refined-change)))
(defun smerge-refine ()
"Highlight the parts of the conflict that are different."
(interactive)
;; FIXME: make it work with 3-way conflicts.
(smerge-match-conflict)
(remove-overlays (match-beginning 0) (match-end 0) 'smerge 'refine)
(smerge-ensure-match 1)
(smerge-ensure-match 3)
(let ((buf (current-buffer))
;; Read them before the match-data gets clobbered.
(beg1 (match-beginning 1)) (end1 (match-end 1))
(beg2 (match-beginning 3)) (end2 (match-end 3))
(file1 (make-temp-file "smerge1"))
(file2 (make-temp-file "smerge2")))
;; Chop up regions into smaller elements and save into files.
(smerge-refine-chopup-region beg1 end1 file1)
(smerge-refine-chopup-region beg2 end2 file2)
;; Call diff on those files.
(unwind-protect
(with-temp-buffer
(let ((coding-system-for-read 'emacs-mule))
(call-process diff-command nil t nil file1 file2))
;; Process diff's output.
(goto-char (point-min))
(while (not (eobp))
(if (not (looking-at "\\([0-9]+\\)\\(?:,\\([0-9]+\\)\\)?\\([acd]\\)\\([0-9]+\\)\\(?:,\\([0-9]+\\)\\)?$"))
(error "Unexpected patch hunk header: %s"
(buffer-substring (point) (line-end-position)))
(let ((op (char-after (match-beginning 3))))
(when (memq op '(?d ?c))
(smerge-refine-highlight-change buf beg1 1 2))
(when (memq op '(?a ?c))
(smerge-refine-highlight-change buf beg2 4 5)))
(forward-line 1) ;Skip hunk header.
(and (re-search-forward "^[0-9]" nil 'move) ;Skip hunk body.
(goto-char (match-beginning 0))))))
(delete-file file1)
(delete-file file2))))
(defun smerge-diff (n1 n2)
(smerge-match-conflict)
(smerge-ensure-match n1)
(smerge-ensure-match n2)
(let ((name1 (aref smerge-match-names n1))
(name2 (aref smerge-match-names n2))
;; Read them before the match-data gets clobbered.
(beg1 (match-beginning n1))
(end1 (match-end n1))
(beg2 (match-beginning n2))
(end2 (match-end n2))
(file1 (make-temp-file "smerge1"))
(file2 (make-temp-file "smerge2"))
(dir default-directory)
(file (if buffer-file-name (file-relative-name buffer-file-name)))
;; We would want to use `emacs-mule-unix' for read&write, but we
;; bump into problems with the coding-system used by diff to write
;; the file names and the time stamps in the header.
;; `buffer-file-coding-system' is not always correct either, but if
;; the OS/user uses only one coding-system, then it works.
(coding-system-for-read buffer-file-coding-system))
(write-region beg1 end1 file1 nil 'nomessage)
(write-region beg2 end2 file2 nil 'nomessage)
(unwind-protect
(with-current-buffer (get-buffer-create smerge-diff-buffer-name)
(setq default-directory dir)
(let ((inhibit-read-only t))
(erase-buffer)
(let ((status
(apply 'call-process diff-command nil t nil
(append smerge-diff-switches
(list "-L" (concat name1 "/" file)
"-L" (concat name2 "/" file)
file1 file2)))))
(if (eq status 0) (insert "No differences found.\n"))))
(goto-char (point-min))
(diff-mode)
(display-buffer (current-buffer) t))
(delete-file file1)
(delete-file file2))))
;; compiler pacifiers
(defvar smerge-ediff-windows)
(defvar smerge-ediff-buf)
(defvar ediff-buffer-A)
(defvar ediff-buffer-B)
(defvar ediff-buffer-C)
(defvar ediff-ancestor-buffer)
(defvar ediff-quit-hook)
;;;###autoload
(defun smerge-ediff (&optional name-mine name-other name-base)
"Invoke ediff to resolve the conflicts.
NAME-MINE, NAME-OTHER, and NAME-BASE, if non-nil, are used for the
buffer names."
(interactive)
(let* ((buf (current-buffer))
(mode major-mode)
;;(ediff-default-variant 'default-B)
(config (current-window-configuration))
(filename (file-name-nondirectory buffer-file-name))
(mine (generate-new-buffer
(or name-mine (concat "*" filename " MINE*"))))
(other (generate-new-buffer
(or name-other (concat "*" filename " OTHER*"))))
base)
(with-current-buffer mine
(buffer-disable-undo)
(insert-buffer-substring buf)
(goto-char (point-min))
(while (smerge-find-conflict)
(when (match-beginning 2) (setq base t))
(smerge-keep-n 1))
(buffer-enable-undo)
(set-buffer-modified-p nil)
(funcall mode))
(with-current-buffer other
(buffer-disable-undo)
(insert-buffer-substring buf)
(goto-char (point-min))
(while (smerge-find-conflict)
(smerge-keep-n 3))
(buffer-enable-undo)
(set-buffer-modified-p nil)
(funcall mode))
(when base
(setq base (generate-new-buffer
(or name-base (concat "*" filename " BASE*"))))
(with-current-buffer base
(buffer-disable-undo)
(insert-buffer-substring buf)
(goto-char (point-min))
(while (smerge-find-conflict)
(if (match-end 2)
(smerge-keep-n 2)
(delete-region (match-beginning 0) (match-end 0))))
(buffer-enable-undo)
(set-buffer-modified-p nil)
(funcall mode)))
;; the rest of the code is inspired from vc.el
;; Fire up ediff.
(set-buffer
(if base
(ediff-merge-buffers-with-ancestor mine other base)
;; nil 'ediff-merge-revisions-with-ancestor buffer-file-name)
(ediff-merge-buffers mine other)))
;; nil 'ediff-merge-revisions buffer-file-name)))
;; Ediff is now set up, and we are in the control buffer.
;; Do a few further adjustments and take precautions for exit.
(set (make-local-variable 'smerge-ediff-windows) config)
(set (make-local-variable 'smerge-ediff-buf) buf)
(set (make-local-variable 'ediff-quit-hook)
(lambda ()
(let ((buffer-A ediff-buffer-A)
(buffer-B ediff-buffer-B)
(buffer-C ediff-buffer-C)
(buffer-Ancestor ediff-ancestor-buffer)
(buf smerge-ediff-buf)
(windows smerge-ediff-windows))
(ediff-cleanup-mess)
(with-current-buffer buf
(erase-buffer)
(insert-buffer-substring buffer-C)
(kill-buffer buffer-A)
(kill-buffer buffer-B)
(kill-buffer buffer-C)
(when (bufferp buffer-Ancestor) (kill-buffer buffer-Ancestor))
(set-window-configuration windows)
(message "Conflict resolution finished; you may save the buffer")))))
(message "Please resolve conflicts now; exit ediff when done")))
;;;###autoload
(define-minor-mode smerge-mode
"Minor mode to simplify editing output from the diff3 program.
\\{smerge-mode-map}"
:group 'smerge :lighter " SMerge"
(when (and (boundp 'font-lock-mode) font-lock-mode)
(save-excursion
(if smerge-mode
(font-lock-add-keywords nil smerge-font-lock-keywords 'append)
(font-lock-remove-keywords nil smerge-font-lock-keywords))
(goto-char (point-min))
(while (smerge-find-conflict)
(save-excursion
(font-lock-fontify-region (match-beginning 0) (match-end 0) nil)))))
(unless smerge-mode
(smerge-remove-props (point-min) (point-max))))
(provide 'smerge-mode)
;; arch-tag: 605c8d1e-e43d-4943-a6f3-1bcc4333e690
;;; smerge-mode.el ends here
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