;;; ediff-diff.el --- diff-related utilities ;; Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc. ;; Author: Michael Kifer ;; 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 "^\\([0-9,]+[acd][0-9,]+$\\|[<>] \\|---\\|.*Warning *:\\|.*No +newline\\|.*missing +newline\\|^\C-m$\\)" "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 "$")) "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