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emacs/lisp/ediff-diff.el
Michael Kifer 2eb4bdca8a new version
1998-05-04 22:42:59 +00:00

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EmacsLisp
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;;; ediff-diff.el --- diff-related utilities
;; Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
;; Author: Michael Kifer <kifer@cs.sunysb.edu>
;; 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
(provide 'ediff-diff)
;; compiler pacifier
(defvar ediff-default-variant)
(eval-when-compile
(let ((load-path (cons (expand-file-name ".") load-path)))
(or (featurep 'ediff-init)
(load "ediff-init.el" nil nil 'nosuffix))
(or (featurep 'ediff-util)
(load "ediff-util.el" nil nil 'nosuffix))
))
;; end pacifier
(require 'ediff-init)
(defgroup ediff-diff nil
"Diff related utilities"
:prefix "ediff-"
:group 'ediff)
(defcustom ediff-shell
(cond ((eq system-type 'emx) "cmd") ; OS/2
((memq system-type '(ms-dos windows-nt windows-95))
shell-file-name) ; no standard name on MS-DOS
((memq system-type '(vax-vms axp-vms)) "*dcl*") ; VMS
(t "sh")) ; UNIX
"*The shell used to run diff and patch. If user's .profile or
.cshrc files are set up correctly, any shell will do. However, some people
set $prompt or other things incorrectly, which leads to undesirable output
messages. These may cause Ediff to fail. In such a case, set ediff-shell
to a shell that you are not using or, better, fix your shell's startup file."
:type 'string
:group 'ediff-diff)
(defcustom ediff-cmp-program "cmp"
"*Utility to use to determine if two files are identical.
It must return code 0, if its arguments are identical files."
:type 'string
:group 'ediff-diff)
(defcustom ediff-diff-program "diff"
"*Program to use for generating the differential of the two files."
:type 'string
:group 'ediff-diff)
(defcustom ediff-diff-options ""
"*Options to pass to `ediff-diff-program'.
If diff\(1\) is used as `ediff-diff-program', then the most useful options are
`-w', to ignore space, and `-i', to ignore case of letters.
At present, the option `-c' is not allowed."
:type 'string
:group 'ediff-diff)
(defcustom ediff-custom-diff-program ediff-diff-program
"*Program to use for generating custom diff output for saving it in a file.
This output is not used by Ediff internally."
:type 'string
:group 'ediff-diff)
(defcustom ediff-custom-diff-options "-c"
"*Options to pass to `ediff-custom-diff-program'."
:type 'string
:group 'ediff-diff)
;;; Support for diff3
(defvar ediff-match-diff3-line "^====\\(.?\\)$"
"Pattern to match lines produced by diff3 that describe differences.")
(defcustom ediff-diff3-program "diff3"
"*Program to be used for three-way comparison.
Must produce output compatible with Unix's diff3 program."
:type 'string
:group 'ediff-diff)
(defcustom ediff-diff3-options ""
"*Options to pass to `ediff-diff3-program'."
:type 'string
:group 'ediff-diff)
(defcustom ediff-diff3-ok-lines-regexp
"^\\([1-3]:\\|====\\| \\|.*Warning *:\\|.*No newline\\|.*missing newline\\|^\C-m$\\)"
"*Regexp that matches normal output lines from `ediff-diff3-program'.
Lines that do not match are assumed to be error messages."
:type 'regexp
:group 'ediff-diff)
;; keeps the status of the current diff in 3-way jobs.
;; the status can be =diff(A), =diff(B), or =diff(A+B)
(ediff-defvar-local ediff-diff-status "" "")
;;; Fine differences
(ediff-defvar-local ediff-auto-refine (if (ediff-has-face-support-p) 'on 'nix)
"If `on', Ediff auto-highlights fine diffs for the current diff region.
If `off', auto-highlighting is not used. If `nix', no fine diffs are shown
at all, unless the user force-refines the region by hitting `*'.
This variable can be set either in .emacs or toggled interactively.
Use `setq-default' if setting it in .emacs")
(ediff-defvar-local ediff-ignore-similar-regions nil
"*If t, skip over difference regions that differ only in the white space and line breaks.
This variable can be set either in .emacs or toggled interactively.
Use `setq-default' if setting it in .emacs")
(ediff-defvar-local ediff-auto-refine-limit 1400
"*Auto-refine only the regions of this size \(in bytes\) or less.")
;;; General
(defvar ediff-diff-ok-lines-regexp
(concat
"^\\("
"[0-9,]+[acd][0-9,]+\C-m?$"
"\\|[<>] "
"\\|---"
"\\|.*Warning *:"
"\\|.*No +newline"
"\\|.*missing +newline"
"\\|^\C-m?$"
"\\)")
"Regexp that matches normal output lines from `ediff-diff-program'.
This is mostly lifted from Emerge, except that Ediff also considers
warnings and `Missing newline'-type messages to be normal output.
Lines that do not match are assumed to be error messages.")
(defvar ediff-match-diff-line
(let ((x "\\([0-9]+\\)\\(\\|,\\([0-9]+\\)\\)"))
(concat "^" x "\\([acd]\\)" x "\C-m?$"))
"Pattern to match lines produced by diff that describe differences.")
(ediff-defvar-local ediff-setup-diff-regions-function nil
"value is a function symbol depending on the kind of job is to be done.
For 2-way jobs and for ediff-merge, it should be `ediff-setup-diff-regions'.
For jobs requiring diff3, it should be `ediff-setup-diff-regions3'.
The function should take three mandatory arguments, file-A, file-B, and
file-C. It may ignore file C for diff2 jobs. It should also take
one optional arguments, diff-number to refine.")
;;; Functions
;; Generate the difference vector and overlays for the two files
;; With optional arg REG-TO-REFINE, refine this region.
;; File-C argument is not used here. It is there just because
;; ediff-setup-diff-regions is called via a funcall to
;; ediff-setup-diff-regions-function, which can also have the value
;; ediff-setup-diff-regions3, which takes 4 arguments.
(defun ediff-setup-diff-regions (file-A file-B file-C)
(if (string-match "c" ediff-diff-options)
(error "Option `-c' is not allowed in `ediff-diff-options'"))
;; create, if it doesn't exist
(or (ediff-buffer-live-p ediff-diff-buffer)
(setq ediff-diff-buffer
(get-buffer-create (ediff-unique-buffer-name "*ediff-diff" "*"))))
(ediff-make-diff2-buffer ediff-diff-buffer file-A file-B)
(ediff-prepare-error-list ediff-diff-ok-lines-regexp ediff-diff-buffer)
(ediff-convert-diffs-to-overlays
(ediff-extract-diffs
ediff-diff-buffer ediff-word-mode ediff-narrow-bounds)))
;; Run the diff program on FILE1 and FILE2 and put the output in DIFF-BUFFER
;; Return the size of DIFF-BUFFER
(defun ediff-make-diff2-buffer (diff-buffer file1 file2)
(let ((file1-size (ediff-file-size file1))
(file2-size (ediff-file-size file2)))
(cond ((not (numberp file1-size))
(message "Can't find file: %s"
(ediff-abbreviate-file-name file1))
(sit-for 2)
;; 1 is an error exit code
1)
((not (numberp file2-size))
(message "Can't find file: %s"
(ediff-abbreviate-file-name file2))
(sit-for 2)
;; 1 is an error exit code
1)
((< file1-size 0)
(message "Can't diff remote files: %s"
(ediff-abbreviate-file-name file1))
(sit-for 2)
;; 1 is an error exit code
1)
((< file2-size 0)
(message "Can't diff remote file: %s"
(ediff-abbreviate-file-name file2))
(sit-for 2)
(message "")
;; 1 is an error exit code
1)
(t (message "Computing differences between %s and %s ..."
(file-name-nondirectory file1)
(file-name-nondirectory file2))
;; this erases the diff buffer automatically
(ediff-exec-process ediff-diff-program
diff-buffer
'synchronize
ediff-diff-options file1 file2)
(message "")
(ediff-with-current-buffer diff-buffer
(buffer-size))))))
;; If file-A/B/C is nil, do 2-way comparison with the non-nil buffers
;; This function works for diff3 and diff2 jobs
(defun ediff-setup-fine-diff-regions (file-A file-B file-C reg-num)
(or (ediff-buffer-live-p ediff-fine-diff-buffer)
(setq ediff-fine-diff-buffer
(get-buffer-create
(ediff-unique-buffer-name "*ediff-fine-diff" "*"))))
(let (diff3-job diff-program diff-options ok-regexp diff-list)
(setq diff3-job ediff-3way-job
diff-program (if diff3-job ediff-diff3-program ediff-diff-program)
diff-options (if diff3-job ediff-diff3-options ediff-diff-options)
ok-regexp (if diff3-job
ediff-diff3-ok-lines-regexp
ediff-diff-ok-lines-regexp))
(ediff-message-if-verbose "Refining difference region %d ..." (1+ reg-num))
(ediff-exec-process diff-program ediff-fine-diff-buffer 'synchronize
diff-options
;; The shuffle below is because we can compare 3-way
;; or in several 2-way fashions, like fA fC, fA fB,
;; or fB fC.
(if file-A file-A file-B)
(if file-B file-B file-A)
(if diff3-job
(if file-C file-C file-B))
) ; exec process
(ediff-prepare-error-list ok-regexp ediff-fine-diff-buffer)
(ediff-message-if-verbose
"")
;; "Refining difference region %d ... done" (1+ reg-num))
(setq diff-list
(if diff3-job
(ediff-extract-diffs3
ediff-fine-diff-buffer '3way-comparison 'word-mode)
(ediff-extract-diffs ediff-fine-diff-buffer 'word-mode)))
;; fixup diff-list
(if diff3-job
(cond ((not file-A)
(mapcar (function (lambda (elt)
(aset elt 0 nil)
(aset elt 1 nil)))
(cdr diff-list)))
((not file-B)
(mapcar (function (lambda (elt)
(aset elt 2 nil)
(aset elt 3 nil)))
(cdr diff-list)))
((not file-C)
(mapcar (function (lambda (elt)
(aset elt 4 nil)
(aset elt 5 nil)))
(cdr diff-list)))
))
(ediff-convert-fine-diffs-to-overlays diff-list reg-num)
))
(defun ediff-prepare-error-list (ok-regexp diff-buff)
(or (ediff-buffer-live-p ediff-error-buffer)
(setq ediff-error-buffer
(get-buffer-create (ediff-unique-buffer-name
"*ediff-errors" "*"))))
(ediff-with-current-buffer ediff-error-buffer
(erase-buffer)
(insert (ediff-with-current-buffer diff-buff (buffer-string)))
(goto-char (point-min))
(delete-matching-lines ok-regexp)
(if (memq system-type '(vax-vms axp-vms))
(delete-matching-lines "^$")))
;; If diff reports errors, show them then quit.
(if (/= 0 (ediff-with-current-buffer ediff-error-buffer (buffer-size)))
(let ((ctl-buf ediff-control-buffer)
(error-buf ediff-error-buffer))
(ediff-skip-unsuitable-frames)
(switch-to-buffer error-buf)
(ediff-kill-buffer-carefully ctl-buf)
(error "Errors in diff output. Diff output is in %S" diff-buff))))
;; BOUNDS specifies visibility bounds to use.
;; WORD-MODE tells whether we are in the word-mode or not.
;; If WORD-MODE, also construct vector of diffs using word numbers.
;; Else, use point values.
;; This function handles diff-2 jobs including the case of
;; merging buffers and files without ancestor.
(defun ediff-extract-diffs (diff-buffer word-mode &optional bounds)
(let ((A-buffer ediff-buffer-A)
(B-buffer ediff-buffer-B)
(C-buffer ediff-buffer-C)
(a-prev 1) ; this is needed to set the first diff line correctly
(b-prev 1)
(c-prev 1)
diff-list shift-A shift-B
)
;; diff list contains word numbers, unless changed later
(setq diff-list (cons (if word-mode 'words 'points)
diff-list))
;; we don't use visibility bounds for buffer C when merging
(if bounds
(setq shift-A
(ediff-overlay-start
(ediff-get-value-according-to-buffer-type 'A bounds))
shift-B
(ediff-overlay-start
(ediff-get-value-according-to-buffer-type 'B bounds))))
;; reset point in buffers A/B/C
(ediff-with-current-buffer A-buffer
(goto-char (if shift-A shift-A (point-min))))
(ediff-with-current-buffer B-buffer
(goto-char (if shift-B shift-B (point-min))))
(if (ediff-buffer-live-p C-buffer)
(ediff-with-current-buffer C-buffer
(goto-char (point-min))))
(ediff-with-current-buffer diff-buffer
(goto-char (point-min))
(while (re-search-forward ediff-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)))
a-begin-pt a-end-pt b-begin-pt b-end-pt
c-begin c-end c-begin-pt c-end-pt)
;; fix the beginning and end numbers, because diff is somewhat
;; strange about how it numbers lines
(if (string-equal diff-type "a")
(setq b-end (1+ b-end)
a-begin (1+ a-begin)
a-end a-begin)
(if (string-equal diff-type "d")
(setq a-end (1+ a-end)
b-begin (1+ b-begin)
b-end b-begin)
;; (string-equal diff-type "c")
(setq a-end (1+ a-end)
b-end (1+ b-end))))
(if (eq ediff-default-variant 'default-B)
(setq c-begin b-begin
c-end b-end)
(setq c-begin a-begin
c-end a-end))
;; compute main diff vector
(if word-mode
;; make diff-list contain word numbers
(setq diff-list
(nconc diff-list
(list
(if (ediff-buffer-live-p C-buffer)
(vector (- a-begin a-prev) (- a-end a-begin)
(- b-begin b-prev) (- b-end b-begin)
(- c-begin c-prev) (- c-end c-begin)
nil nil ; dummy ancestor
nil ; state of diff
nil ; state of merge
nil ; state of ancestor
)
(vector (- a-begin a-prev) (- a-end a-begin)
(- b-begin b-prev) (- b-end b-begin)
nil nil ; dummy buf C
nil nil ; dummy ancestor
nil ; state of diff
nil ; state of merge
nil ; state of ancestor
))
))
a-prev a-end
b-prev b-end
c-prev c-end)
;; else convert lines to points
(ediff-with-current-buffer A-buffer
(forward-line (- a-begin a-prev))
(setq a-begin-pt (point))
(forward-line (- a-end a-begin))
(setq a-end-pt (point)
a-prev a-end))
(ediff-with-current-buffer B-buffer
(forward-line (- b-begin b-prev))
(setq b-begin-pt (point))
(forward-line (- b-end b-begin))
(setq b-end-pt (point)
b-prev b-end))
(if (ediff-buffer-live-p C-buffer)
(ediff-with-current-buffer C-buffer
(forward-line (- c-begin c-prev))
(setq c-begin-pt (point))
(forward-line (- c-end c-begin))
(setq c-end-pt (point)
c-prev c-end)))
(setq diff-list
(nconc
diff-list
(list
(if (ediff-buffer-live-p C-buffer)
(vector
a-begin-pt a-end-pt b-begin-pt b-end-pt
c-begin-pt c-end-pt
nil nil ; dummy ancestor
;; state of diff
;; shows which buff is different from the other two
(if (eq ediff-default-variant 'default-B) 'A 'B)
ediff-default-variant ; state of merge
nil ; state of ancestor
)
(vector a-begin-pt a-end-pt
b-begin-pt b-end-pt
nil nil ; dummy buf C
nil nil ; dummy ancestor
nil nil ; dummy state of diff & merge
nil ; dummy state of ancestor
)))
)))
))) ; end ediff-with-current-buffer
diff-list
))
(defun ediff-convert-diffs-to-overlays (diff-list)
(ediff-set-diff-overlays-in-one-buffer 'A diff-list)
(ediff-set-diff-overlays-in-one-buffer 'B diff-list)
(if ediff-3way-job
(ediff-set-diff-overlays-in-one-buffer 'C diff-list))
(if ediff-merge-with-ancestor-job
(ediff-set-diff-overlays-in-one-buffer 'Ancestor diff-list))
;; set up vector showing the status of merge regions
(if ediff-merge-job
(setq ediff-state-of-merge
(vconcat
(mapcar (function
(lambda (elt)
(let ((state-of-merge (aref elt 9))
(state-of-ancestor (aref elt 10)))
(vector
(if state-of-merge (format "%S" state-of-merge))
state-of-ancestor))))
;; the first elt designates type of list
(cdr diff-list))
)))
(message "Processing difference regions ... done"))
(defun ediff-set-diff-overlays-in-one-buffer (buf-type diff-list)
(let* ((current-diff -1)
(buff (ediff-get-buffer buf-type))
;; ediff-extract-diffs puts the type of diff-list as the first elt
;; of this list. The type is either 'points or 'words
(diff-list-type (car diff-list))
(shift (ediff-overlay-start
(ediff-get-value-according-to-buffer-type
buf-type ediff-narrow-bounds)))
(limit (ediff-overlay-end
(ediff-get-value-according-to-buffer-type
buf-type ediff-narrow-bounds)))
diff-overlay-list list-element total-diffs
begin end pt-saved overlay state-of-diff)
(setq diff-list (cdr diff-list)) ; discard diff list type
(setq total-diffs (length diff-list))
;; shift, if necessary
(ediff-with-current-buffer buff (setq pt-saved shift))
(while diff-list
(setq current-diff (1+ current-diff)
list-element (car diff-list)
begin (aref list-element (cond ((eq buf-type 'A) 0)
((eq buf-type 'B) 2)
((eq buf-type 'C) 4)
(t 6))) ; Ancestor
end (aref list-element (cond ((eq buf-type 'A) 1)
((eq buf-type 'B) 3)
((eq buf-type 'C) 5)
(t 7))) ; Ancestor
state-of-diff (aref list-element 8)
)
(cond ((and (not (eq buf-type state-of-diff))
(not (eq buf-type 'Ancestor))
(memq state-of-diff '(A B C)))
(setq state-of-diff
(car (delq buf-type (delq state-of-diff (list 'A 'B 'C)))))
(setq state-of-diff (format "=diff(%S)" state-of-diff))
)
(t (setq state-of-diff nil)))
;; Put overlays at appropriate places in buffer
;; convert word numbers to points, if necessary
(if (eq diff-list-type 'words)
(progn
(ediff-with-current-buffer buff (goto-char pt-saved))
(setq begin (ediff-goto-word (1+ begin) buff)
end (ediff-goto-word end buff 'end))
(if (> end limit) (setq end limit))
(if (> begin end) (setq begin end))
(setq pt-saved (ediff-with-current-buffer buff (point)))))
(setq overlay (ediff-make-bullet-proof-overlay begin end buff))
(ediff-overlay-put overlay 'priority ediff-shadow-overlay-priority)
(ediff-overlay-put overlay 'ediff-diff-num current-diff)
(if (and (ediff-has-face-support-p)
ediff-use-faces ediff-highlight-all-diffs)
(ediff-set-overlay-face
overlay (ediff-background-face buf-type current-diff)))
(if (= 0 (mod current-diff 10))
(message "Buffer %S: Processing difference region %d of %d"
buf-type current-diff total-diffs))
;; record all overlays for this difference
;; the second elt, nil, is a place holder for the fine diff vector.
;; the third elt, nil, is a place holder for no-fine-diffs flag.
(setq diff-overlay-list
(nconc
diff-overlay-list
(list (vector overlay nil nil state-of-diff)))
diff-list
(cdr diff-list))
) ; while
(set (ediff-get-symbol-from-alist buf-type ediff-difference-vector-alist)
(vconcat diff-overlay-list))
))
;; `n' is the diff region to work on. Default is ediff-current-difference.
;; if `flag' is 'noforce then make fine-diffs only if this region's fine
;; diffs have not been computed before.
;; if `flag' is 'skip then don't compute fine diffs for this region.
(defun ediff-make-fine-diffs (&optional n flag)
(or n (setq n ediff-current-difference))
(if (< ediff-number-of-differences 1)
(error ediff-NO-DIFFERENCES))
(if ediff-word-mode
(setq flag 'skip
ediff-auto-refine 'nix))
(or (< n 0)
(>= n ediff-number-of-differences)
;; n is within the range
(let ((tmp-buffer (get-buffer-create ediff-tmp-buffer))
(file-A ediff-temp-file-A)
(file-B ediff-temp-file-B)
(file-C ediff-temp-file-C)
(empty-A (ediff-empty-diff-region-p n 'A))
(empty-B (ediff-empty-diff-region-p n 'B))
(empty-C (ediff-empty-diff-region-p n 'C))
(whitespace-A (ediff-whitespace-diff-region-p n 'A))
(whitespace-B (ediff-whitespace-diff-region-p n 'B))
(whitespace-C (ediff-whitespace-diff-region-p n 'C))
cumulative-fine-diff-length)
(cond ;; If one of the regions is empty (or 2 in 3way comparison)
;; then don't refine.
;; If the region happens to be entirely whitespace or empty then
;; mark as such.
((> (length (delq nil (list empty-A empty-B empty-C))) 1)
(if (and (ediff-looks-like-combined-merge n)
ediff-merge-job)
(ediff-set-fine-overlays-in-one-buffer 'C nil n))
(if ediff-3way-comparison-job
(ediff-message-if-verbose
"Region %d is empty in all buffers but %S"
(1+ n)
(cond ((not empty-A) 'A)
((not empty-B) 'B)
((not empty-C) 'C)))
(ediff-message-if-verbose
"Region %d in buffer %S is empty"
(1+ n)
(cond (empty-A 'A)
(empty-B 'B)
(empty-C 'C)))
)
;; if all regions happen to be whitespace
(if (and whitespace-A whitespace-B whitespace-C)
;; mark as space only
(ediff-mark-diff-as-space-only n t)
;; if some regions are white and others don't, then mark as
;; non-white-space-only
(ediff-mark-diff-as-space-only n nil)))
;; don't compute fine diffs if diff vector exists
((and (eq flag 'noforce) (ediff-get-fine-diff-vector n 'A))
(if (ediff-no-fine-diffs-p n)
(message
"Only white-space differences in region %d %s"
(1+ n)
(cond ((eq (ediff-no-fine-diffs-p n) 'A)
"in buffers B & C")
((eq (ediff-no-fine-diffs-p n) 'B)
"in buffers A & C")
((eq (ediff-no-fine-diffs-p n) 'C)
"in buffers A & B")
(t "")))))
;; don't compute fine diffs for this region
((eq flag 'skip)
(or (ediff-get-fine-diff-vector n 'A)
(memq ediff-auto-refine '(off nix))
(ediff-message-if-verbose
"Region %d exceeds auto-refine limit. Type `%s' to refine"
(1+ n)
(substitute-command-keys
"\\[ediff-make-or-kill-fine-diffs]")
)))
(t
;; recompute fine diffs
(ediff-wordify
(ediff-get-diff-posn 'A 'beg n)
(ediff-get-diff-posn 'A 'end n)
ediff-buffer-A
tmp-buffer
ediff-control-buffer)
(setq file-A
(ediff-make-temp-file tmp-buffer "fineDiffA" file-A))
(ediff-wordify
(ediff-get-diff-posn 'B 'beg n)
(ediff-get-diff-posn 'B 'end n)
ediff-buffer-B
tmp-buffer
ediff-control-buffer)
(setq file-B
(ediff-make-temp-file tmp-buffer "fineDiffB" file-B))
(if ediff-3way-job
(progn
(ediff-wordify
(ediff-get-diff-posn 'C 'beg n)
(ediff-get-diff-posn 'C 'end n)
ediff-buffer-C
tmp-buffer
ediff-control-buffer)
(setq file-C
(ediff-make-temp-file
tmp-buffer "fineDiffC" file-C))))
;; save temp file names.
(setq ediff-temp-file-A file-A
ediff-temp-file-B file-B
ediff-temp-file-C file-C)
;; set the new vector of fine diffs, if none exists
(cond ((and ediff-3way-job whitespace-A)
(ediff-setup-fine-diff-regions nil file-B file-C n))
((and ediff-3way-job whitespace-B)
(ediff-setup-fine-diff-regions file-A nil file-C n))
((and ediff-3way-job
;; In merge-jobs, whitespace-C is t, since
;; ediff-empty-diff-region-p returns t in this case
whitespace-C)
(ediff-setup-fine-diff-regions file-A file-B nil n))
(t
(ediff-setup-fine-diff-regions file-A file-B file-C n)))
(setq cumulative-fine-diff-length
(+ (length (ediff-get-fine-diff-vector n 'A))
(length (ediff-get-fine-diff-vector n 'B))
;; in merge jobs, the merge buffer is never refined
(if (and file-C (not ediff-merge-job))
(length (ediff-get-fine-diff-vector n 'C))
0)))
(cond ((or
;; all regions are white space
(and whitespace-A whitespace-B whitespace-C)
;; none is white space and no fine diffs detected
(and (not whitespace-A)
(not whitespace-B)
(not (and ediff-3way-job whitespace-C))
(eq cumulative-fine-diff-length 0)))
(ediff-mark-diff-as-space-only n t)
(ediff-message-if-verbose
"Only white-space differences in region %d" (1+ n)))
((eq cumulative-fine-diff-length 0)
(ediff-message-if-verbose
"Only white-space differences in region %d %s"
(1+ n)
(cond (whitespace-A (ediff-mark-diff-as-space-only n 'A)
"in buffers B & C")
(whitespace-B (ediff-mark-diff-as-space-only n 'B)
"in buffers A & C")
(whitespace-C (ediff-mark-diff-as-space-only n 'C)
"in buffers A & B"))))
(t
(ediff-mark-diff-as-space-only n nil)))
)
) ; end cond
(ediff-set-fine-diff-properties n)
)))
;; Interface to ediff-make-fine-diffs. Checks for auto-refine limit, etc.
(defun ediff-install-fine-diff-if-necessary (n)
(cond ((eq ediff-auto-refine 'on)
(if (and
(> ediff-auto-refine-limit
(- (ediff-get-diff-posn 'A 'end n)
(ediff-get-diff-posn 'A 'beg n)))
(> ediff-auto-refine-limit
(- (ediff-get-diff-posn 'B 'end n)
(ediff-get-diff-posn 'B 'beg n))))
(ediff-make-fine-diffs n 'noforce)
(ediff-make-fine-diffs n 'skip)))
;; highlight iff fine diffs already exist
((eq ediff-auto-refine 'off)
(ediff-make-fine-diffs n 'skip))))
;; if fine diff vector is not set for diff N, then do nothing
(defun ediff-set-fine-diff-properties (n &optional default)
(or (not (ediff-has-face-support-p))
(< n 0)
(>= n ediff-number-of-differences)
;; when faces are supported, set faces and priorities of fine overlays
(progn
(ediff-set-fine-diff-properties-in-one-buffer 'A n default)
(ediff-set-fine-diff-properties-in-one-buffer 'B n default)
(if ediff-3way-job
(ediff-set-fine-diff-properties-in-one-buffer 'C n default)))))
(defun ediff-set-fine-diff-properties-in-one-buffer (buf-type
n &optional default)
(let ((fine-diff-vector (ediff-get-fine-diff-vector n buf-type))
(face (if default
'default
(face-name
(ediff-get-symbol-from-alist
buf-type ediff-fine-diff-face-alist))))
(priority (if default
0
(1+ (or (ediff-overlay-get
(symbol-value
(ediff-get-symbol-from-alist
buf-type
ediff-current-diff-overlay-alist))
'priority)
0)))))
(mapcar
(function (lambda (overl)
(ediff-set-overlay-face overl face)
(ediff-overlay-put overl 'priority priority)))
fine-diff-vector)))
;; This assumes buffer C and that the region looks like a combination of
;; regions in buffer A and C.
(defun ediff-set-fine-overlays-for-combined-merge (diff-list reg-num)
(let (overlay1 overlay2 overlay3)
(setq overlay1 (ediff-make-bullet-proof-overlay (nth 0 diff-list)
(nth 1 diff-list)
ediff-buffer-C)
overlay2 (ediff-make-bullet-proof-overlay (nth 2 diff-list)
(nth 3 diff-list)
ediff-buffer-C)
overlay3 (ediff-make-bullet-proof-overlay (nth 4 diff-list)
(nth 5 diff-list)
ediff-buffer-C))
(ediff-set-fine-diff-vector reg-num 'C (vector overlay1 overlay2 overlay3))
))
;; Convert diff list to overlays for a given DIFF-REGION
;; in buffer of type BUF-TYPE
(defun ediff-set-fine-overlays-in-one-buffer (buf-type diff-list region-num)
(let* ((current-diff -1)
(reg-start (ediff-get-diff-posn buf-type 'beg region-num))
(buff (ediff-get-buffer buf-type))
combined-merge-diff-list
diff-overlay-list list-element
begin end overlay)
(ediff-clear-fine-differences-in-one-buffer region-num buf-type)
(setq diff-list (cdr diff-list)) ; discard list type (words or points)
(ediff-with-current-buffer buff (goto-char reg-start))
;; if it is a combined merge then set overlays in buff C specially
(if (and ediff-merge-job (eq buf-type 'C)
(setq combined-merge-diff-list
(ediff-looks-like-combined-merge region-num)))
(ediff-set-fine-overlays-for-combined-merge
combined-merge-diff-list region-num)
;; regular fine diff
(while diff-list
(setq current-diff (1+ current-diff)
list-element (car diff-list)
begin (aref list-element (cond ((eq buf-type 'A) 0)
((eq buf-type 'B) 2)
(t 4))) ; buf C
end (aref list-element (cond ((eq buf-type 'A) 1)
((eq buf-type 'B) 3)
(t 5)))) ; buf C
(if (not (or begin end))
() ; skip this diff
;; Put overlays at appropriate places in buffers
;; convert lines to points, if necessary
(setq begin (ediff-goto-word (1+ begin) buff)
end (ediff-goto-word end buff 'end))
(setq overlay (ediff-make-bullet-proof-overlay begin end buff))
;; record all overlays for this difference region
(setq diff-overlay-list (nconc diff-overlay-list (list overlay))))
(setq diff-list (cdr diff-list))
) ; while
;; convert the list of difference information into a vector
;; for fast access
(ediff-set-fine-diff-vector
region-num buf-type (vconcat diff-overlay-list))
)))
;; Stolen from emerge.el
(defun ediff-get-diff3-group (file)
;; This save-excursion allows ediff-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)))))
;; If WORD-MODE, construct vector of diffs using word numbers.
;; Else, use point values.
;; WORD-MODE also tells if we are in the word-mode or not.
;; If THREE-WAY-COMP, then it is a 3-way comparison. Else, it is merging
;; with ancestor, in which case buffer-C contents is identical to buffer-A/B,
;; contents (unless buffer-A is narrowed) depending on ediff-default-variant's
;; value.
;; BOUNDS specifies visibility bounds to use.
(defun ediff-extract-diffs3 (diff-buffer word-mode three-way-comp
&optional bounds)
(let ((A-buffer ediff-buffer-A)
(B-buffer ediff-buffer-B)
(C-buffer ediff-buffer-C)
(anc-buffer ediff-ancestor-buffer)
(a-prev 1) ; needed to set the first diff line correctly
(b-prev 1)
(c-prev 1)
(anc-prev 1)
diff-list shift-A shift-B shift-C
)
;; diff list contains word numbers or points, depending on word-mode
(setq diff-list (cons (if word-mode 'words 'points)
diff-list))
(if bounds
(setq shift-A
(ediff-overlay-start
(ediff-get-value-according-to-buffer-type 'A bounds))
shift-B
(ediff-overlay-start
(ediff-get-value-according-to-buffer-type 'B bounds))
shift-C
(if three-way-comp
(ediff-overlay-start
(ediff-get-value-according-to-buffer-type 'C bounds)))))
;; reset point in buffers A, B, C
(ediff-with-current-buffer A-buffer
(goto-char (if shift-A shift-A (point-min))))
(ediff-with-current-buffer B-buffer
(goto-char (if shift-B shift-B (point-min))))
(if three-way-comp
(ediff-with-current-buffer C-buffer
(goto-char (if shift-C shift-C (point-min)))))
(if (ediff-buffer-live-p anc-buffer)
(ediff-with-current-buffer anc-buffer
(goto-char (point-min))))
(ediff-with-current-buffer diff-buffer
(goto-char (point-min))
(while (re-search-forward ediff-match-diff3-line nil t)
;; leave point after matched line
(beginning-of-line 2)
(let ((agreement (buffer-substring (match-beginning 1) (match-end 1))))
;; if the files A and B are the same and not 3way-comparison,
;; ignore the difference
(if (or three-way-comp (not (string-equal agreement "3")))
(let* ((a-begin (car (ediff-get-diff3-group "1")))
(a-end (nth 1 (ediff-get-diff3-group "1")))
(b-begin (car (ediff-get-diff3-group "2")))
(b-end (nth 1 (ediff-get-diff3-group "2")))
(c-or-anc-begin (car (ediff-get-diff3-group "3")))
(c-or-anc-end (nth 1 (ediff-get-diff3-group "3")))
(state-of-merge
(cond ((string-equal agreement "1") 'prefer-A)
((string-equal agreement "2") 'prefer-B)
(t ediff-default-variant)))
(state-of-diff-merge
(if (memq state-of-merge '(default-A prefer-A)) 'B 'A))
(state-of-diff-comparison
(cond ((string-equal agreement "1") 'A)
((string-equal agreement "2") 'B)
((string-equal agreement "3") 'C)))
state-of-ancestor
c-begin c-end
a-begin-pt a-end-pt
b-begin-pt b-end-pt
c-begin-pt c-end-pt
anc-begin-pt anc-end-pt)
(setq state-of-ancestor
(= c-or-anc-begin c-or-anc-end))
(cond (three-way-comp
(setq c-begin c-or-anc-begin
c-end c-or-anc-end))
((eq ediff-default-variant 'default-B)
(setq c-begin b-begin
c-end b-end))
(t
(setq c-begin a-begin
c-end a-end)))
;; compute main diff vector
(if word-mode
;; make diff-list contain word numbers
(setq diff-list
(nconc diff-list
(list (vector
(- a-begin a-prev) (- a-end a-begin)
(- b-begin b-prev) (- b-end b-begin)
(- c-begin c-prev) (- c-end c-begin)
nil nil ; dummy ancestor
nil ; state of diff
nil ; state of merge
nil ; state of ancestor
)))
a-prev a-end
b-prev b-end
c-prev c-end)
;; else convert lines to points
(ediff-with-current-buffer A-buffer
(forward-line (- a-begin a-prev))
(setq a-begin-pt (point))
(forward-line (- a-end a-begin))
(setq a-end-pt (point)
a-prev a-end))
(ediff-with-current-buffer B-buffer
(forward-line (- b-begin b-prev))
(setq b-begin-pt (point))
(forward-line (- b-end b-begin))
(setq b-end-pt (point)
b-prev b-end))
(ediff-with-current-buffer C-buffer
(forward-line (- c-begin c-prev))
(setq c-begin-pt (point))
(forward-line (- c-end c-begin))
(setq c-end-pt (point)
c-prev c-end))
(if (ediff-buffer-live-p anc-buffer)
(ediff-with-current-buffer anc-buffer
(forward-line (- c-or-anc-begin anc-prev))
(setq anc-begin-pt (point))
(forward-line (- c-or-anc-end c-or-anc-begin))
(setq anc-end-pt (point)
anc-prev c-or-anc-end)))
(setq diff-list
(nconc
diff-list
;; if comparing with ancestor, then there also is a
;; state-of-difference marker
(if three-way-comp
(list (vector
a-begin-pt a-end-pt
b-begin-pt b-end-pt
c-begin-pt c-end-pt
nil nil ; ancestor begin/end
state-of-diff-comparison
nil ; state of merge
nil ; state of ancestor
))
(list (vector a-begin-pt a-end-pt
b-begin-pt b-end-pt
c-begin-pt c-end-pt
anc-begin-pt anc-end-pt
state-of-diff-merge
state-of-merge
state-of-ancestor
)))
)))
))
))) ; end ediff-with-current-buffer
diff-list
))
;; Generate the difference vector and overlays for three files
;; File-C is either the third file to compare (in case of 3-way comparison)
;; or it is the ancestor file.
(defun ediff-setup-diff-regions3 (file-A file-B file-C)
(or (ediff-buffer-live-p ediff-diff-buffer)
(setq ediff-diff-buffer
(get-buffer-create (ediff-unique-buffer-name "*ediff-diff" "*"))))
(message "Computing differences ...")
(ediff-exec-process ediff-diff3-program ediff-diff-buffer 'synchronize
ediff-diff3-options file-A file-B file-C)
(ediff-prepare-error-list ediff-diff3-ok-lines-regexp ediff-diff-buffer)
;;(message "Computing differences ... done")
(ediff-convert-diffs-to-overlays
(ediff-extract-diffs3
ediff-diff-buffer
ediff-word-mode ediff-3way-comparison-job ediff-narrow-bounds)
))
;; Execute PROGRAM asynchronously, unless OS/2, Windows-*, or DOS, or unless
;; SYNCH is non-nil. BUFFER must be a buffer object, and must be alive. The
;; OPTIONS arg is a list of options to pass to PROGRAM. It may be a blank
;; string. All elements in FILES must be strings. We also delete nil from
;; args.
(defun ediff-exec-process (program buffer synch options &rest files)
(let ((data (match-data))
args)
(setq args (append (split-string options) files))
(setq args (delete "" (delq nil args))) ; delete nil and "" from arguments
(unwind-protect
(let ((directory default-directory)
proc)
(save-excursion
(set-buffer buffer)
(erase-buffer)
(setq default-directory directory)
(if (or (memq system-type '(emx ms-dos windows-nt windows-95))
synch)
;; In OS/2 (emx) do it synchronously, since OS/2 doesn't let us
;; delete files used by other processes. Thus, in ediff-buffers
;; and similar functions, we can't delete temp files because
;; they might be used by the asynch process that computes
;; custom diffs. So, we have to wait till custom diff
;; subprocess is done.
;; Similarly for Windows-*
;; In DOS, must synchronize because DOS doesn't have
;; asynchronous processes.
(apply 'call-process program nil buffer nil args)
;; On other systems, do it asynchronously.
(setq proc (get-buffer-process buffer))
(if proc (kill-process proc))
(setq proc
(apply 'start-process "Custom Diff" buffer program args))
(setq mode-line-process '(":%s"))
(set-process-sentinel proc 'ediff-process-sentinel)
(set-process-filter proc 'ediff-process-filter)
)))
(store-match-data data))))
;; This is shell-command-filter from simple.el in FSF Emacs.
;; Copied here because XEmacs doesn't have it.
(defun ediff-process-filter (proc string)
;; Do save-excursion by hand so that we can leave point numerically unchanged
;; despite an insertion immediately after it.
(let* ((obuf (current-buffer))
(buffer (process-buffer proc))
opoint
(window (get-buffer-window buffer))
(pos (window-start window)))
(unwind-protect
(progn
(set-buffer buffer)
(or (= (point) (point-max))
(setq opoint (point)))
(goto-char (point-max))
(insert-before-markers string))
;; insert-before-markers moved this marker: set it back.
(set-window-start window pos)
;; Finish our save-excursion.
(if opoint
(goto-char opoint))
(set-buffer obuf))))
;; like shell-command-sentinel but doesn't print an exit status message
;; we do this because diff always exits with status 1, if diffs are found
;; so shell-command-sentinel displays a confusing message to the user
(defun ediff-process-sentinel (process signal)
(if (and (memq (process-status process) '(exit signal))
(buffer-name (process-buffer process)))
(progn
(save-excursion
(set-buffer (process-buffer process))
(setq mode-line-process nil))
(delete-process process))))
;;; Word functions used to refine the current diff
(defvar ediff-forward-word-function 'ediff-forward-word
"*Function to call to move to the next word.
Used for splitting difference regions into individual words.")
(defvar ediff-whitespace " \n\t\f"
"*Characters constituting white space.
These characters are ignored when differing regions are split into words.")
;;(defvar ediff-word-1 "a-zA-Z---_`'.?!:"
(defvar ediff-word-1 "a-zA-Z---_"
"*Characters that constitute words of type 1.
More precisely, [ediff-word-1] is a regexp that matches type 1 words.
See `ediff-forward-word' for more details.")
(defvar ediff-word-2 "0-9.,"
"*Characters that constitute words of type 2.
More precisely, [ediff-word-2] is a regexp that matches type 2 words.
See `ediff-forward-word' for more details.")
(defvar ediff-word-3 "`'?!:;\"{}[]()"
"*Characters that constitute words of type 3.
More precisely, [ediff-word-3] is a regexp that matches type 3 words.
See `ediff-forward-word' for more details.")
(defvar ediff-word-4
(concat "^" ediff-word-1 ediff-word-2 ediff-word-3 ediff-whitespace)
"*Characters that constitute words of type 4.
More precisely, [ediff-word-4] is a regexp that matches type 4 words.
See `ediff-forward-word' for more details.")
;; Split region along word boundaries. Each word will be on its own line.
;; Output to buffer out-buffer.
(defun ediff-forward-word ()
"Move point one word forward.
There are four types of words, each of which consists entirely of
characters in `ediff-word-1', `ediff-word-2', `ediff-word-3', or
`ediff-word-4'. Words are recognized by passing these in turn as the
argument to `skip-chars-forward'."
(or (> (skip-chars-forward ediff-word-1) 0)
(> (skip-chars-forward ediff-word-2) 0)
(> (skip-chars-forward ediff-word-3) 0)
(> (skip-chars-forward ediff-word-4) 0)
))
(defun ediff-wordify (beg end in-buffer out-buffer &optional control-buf)
(let (sv-point string)
(save-excursion
(set-buffer in-buffer)
(setq string (buffer-substring-no-properties beg end))
(set-buffer out-buffer)
(erase-buffer)
(insert string)
(goto-char (point-min))
(skip-chars-forward ediff-whitespace)
(delete-region (point-min) (point))
(while (not (eobp))
;; eval incontrol buf to let user create local versions for
;; different invocations
(if control-buf
(funcall
(ediff-with-current-buffer control-buf ediff-forward-word-function))
(funcall ediff-forward-word-function))
(setq sv-point (point))
(skip-chars-forward ediff-whitespace)
(delete-region sv-point (point))
(insert "\n")))))
;; copy string from BEG END from IN-BUF to OUT-BUF
(defun ediff-copy-to-buffer (beg end in-buffer out-buffer)
(let (string)
(save-excursion
(set-buffer in-buffer)
(setq string (buffer-substring beg end))
(set-buffer out-buffer)
(erase-buffer)
(insert string)
(goto-char (point-min)))))
;; goto word #n starting at current position in buffer `buf'
;; For ediff, a word is either a string of a-z,A-Z, incl `-' and `_';
;; or a string of other non-blanks. A blank is a \n\t\f
;; If `flag' is non-nil, goto the end of the n-th word.
(defun ediff-goto-word (n buf &optional flag)
;; remember val ediff-forward-word-function has in ctl buf
(let ((fwd-word-fun ediff-forward-word-function))
(ediff-with-current-buffer buf
(skip-chars-forward ediff-whitespace)
(while (> n 1)
(funcall fwd-word-fun)
(skip-chars-forward ediff-whitespace)
(setq n (1- n)))
(if (and flag (> n 0))
(funcall fwd-word-fun))
(point))))
(defun ediff-same-file-contents (f1 f2)
"T if F1 and F2 have identical contents."
(let ((res (call-process ediff-cmp-program nil nil nil f1 f2)))
(and (numberp res) (eq res 0))))
;;; Local Variables:
;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun)
;;; eval: (put 'ediff-with-current-buffer 'lisp-indent-hook 1)
;;; eval: (put 'ediff-with-current-buffer 'edebug-form-spec '(form body))
;;; End:
;; ediff-diff.el ends here
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