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Diffstat (limited to 'lisp/vc/ediff-diff.el')
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diff --git a/lisp/vc/ediff-diff.el b/lisp/vc/ediff-diff.el new file mode 100644 index 00000000000..fbbdc3b7bce --- /dev/null +++ b/lisp/vc/ediff-diff.el @@ -0,0 +1,1534 @@ +;;; ediff-diff.el --- diff-related utilities + +;; Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, +;; 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. + +;; Author: Michael Kifer <kifer@cs.stonybrook.edu> +;; Package: ediff + +;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>. + +;;; Commentary: + +;;; Code: + + +(provide 'ediff-diff) + +(eval-when-compile + (require 'ediff-util)) + +(require 'ediff-init) + +(defgroup ediff-diff nil + "Diff related utilities." + :prefix "ediff-" + :group 'ediff) + +(defcustom ediff-diff-program "diff" + "Program to use for generating the differential of the two files." + :type 'string + :group 'ediff-diff) +(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) + + +;; The following functions must precede all defcustom-defined variables. + +(fset 'ediff-set-actual-diff-options '(lambda () nil)) + +(defcustom ediff-shell + (cond ((memq system-type '(ms-dos windows-nt)) + shell-file-name) ; no standard name on MS-DOS + (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-cmp-options nil + "Options to pass to `ediff-cmp-program'. +If GNU diff is used as `ediff-cmp-program', then the most useful options +are `-I REGEXP', to ignore changes whose lines match the REGEXP." + :type '(repeat string) + :group 'ediff-diff) + +(defun ediff-set-diff-options (symbol value) + (set symbol value) + (ediff-set-actual-diff-options)) + +(defcustom ediff-diff-options + (if (memq system-type '(ms-dos windows-nt)) "--binary" "") + "Options to pass to `ediff-diff-program'. +If Unix diff is used as `ediff-diff-program', +then a useful option is `-w', to ignore space. +Options `-c', `-u', and `-i' are not allowed. Case sensitivity can be +toggled interactively using \\[ediff-toggle-ignore-case]. + +Do not remove the default options. If you need to change this variable, add new +options after the default ones. + +This variable is not for customizing the look of the differences produced by +the command \\[ediff-show-diff-output]. Use the variable +`ediff-custom-diff-options' for that." + :set 'ediff-set-diff-options + :type 'string + :group 'ediff-diff) + +(ediff-defvar-local ediff-ignore-case nil + "*If t, skip over difference regions that differ only in letter case. +This variable can be set either in .emacs or toggled interactively. +Use `setq-default' if setting it in .emacs") + +(defcustom ediff-ignore-case-option "-i" + "Option that causes the diff program to ignore case of letters." + :type 'string + :group 'ediff-diff) + +(defcustom ediff-ignore-case-option3 "" + "Option that causes the diff3 program to ignore case of letters. +GNU diff3 doesn't have such an option." + :type 'string + :group 'ediff-diff) + +;; the actual options used in comparison +(ediff-defvar-local ediff-actual-diff-options ediff-diff-options "") + +(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 "^====\\(.?\\)\C-m?$" + "Pattern to match lines produced by diff3 that describe differences.") +(defcustom ediff-diff3-options "" + "Options to pass to `ediff-diff3-program'." + :set 'ediff-set-diff-options + :type 'string + :group 'ediff-diff) + +;; the actual options used in comparison +(ediff-defvar-local ediff-actual-diff3-options ediff-diff3-options "") + +(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 14000 + "*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) + ;; looking for '-c', '-i', '-u', or 'c', 'i', 'u' among clustered non-long options + (if (string-match "^-[ciu]\\| -[ciu]\\|\\(^\\| \\)-[^- ]+[ciu]" + ediff-diff-options) + (error "Options `-c', `-u', and `-i' are 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 +;; The return code isn't used in the program at present. +(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) + (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-actual-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-actual-diff3-options + ediff-actual-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) + (mapc (lambda (elt) + (aset elt 0 nil) + (aset elt 1 nil)) + (cdr diff-list))) + ((not file-B) + (mapc (lambda (elt) + (aset elt 2 nil) + (aset elt 3 nil)) + (cdr diff-list))) + ((not file-C) + (mapc (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 + (setq buffer-undo-list t) + (erase-buffer) + (insert (ediff-with-current-buffer diff-buff (buffer-string))) + (goto-char (point-min)) + (delete-matching-lines ok-regexp)) + ;; 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 + (a-prev-pt nil) + (b-prev 1) + (b-prev-pt nil) + (c-prev 1) + (c-prev-pt nil) + 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-number (buffer-substring (match-beginning 1) + (match-end 1)))) + (a-end (let ((b (match-beginning 3)) + (e (match-end 3))) + (if b + (string-to-number (buffer-substring b e)) + a-begin))) + (diff-type (buffer-substring (match-beginning 4) (match-end 4))) + (b-begin (string-to-number (buffer-substring (match-beginning 5) + (match-end 5)))) + (b-end (let ((b (match-beginning 7)) + (e (match-end 7))) + (if b + (string-to-number (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 + (let ((longlines-mode-val + (if (and (boundp 'longlines-mode) longlines-mode) 1 0))) + ;; we must disable and then restore longlines-mode + (if (eq longlines-mode-val 1) + (longlines-mode 0)) + (goto-char (or a-prev-pt shift-A (point-min))) + (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 + a-prev-pt a-end-pt) + (if (eq longlines-mode-val 1) + (longlines-mode longlines-mode-val)) + )) + (ediff-with-current-buffer B-buffer + (let ((longlines-mode-val + (if (and (boundp 'longlines-mode) longlines-mode) 1 0))) + (if (eq longlines-mode-val 1) + (longlines-mode 0)) + (goto-char (or b-prev-pt shift-B (point-min))) + (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 + b-prev-pt b-end-pt) + (if (eq longlines-mode-val 1) + (longlines-mode longlines-mode-val)) + )) + (if (ediff-buffer-live-p C-buffer) + (ediff-with-current-buffer C-buffer + (let ((longlines-mode-val + (if (and (boundp 'longlines-mode) longlines-mode) 1 0))) + (if (eq longlines-mode-val 1) + (longlines-mode 0)) + (goto-char (or c-prev-pt (point-min))) + (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 + c-prev-pt c-end-pt) + (if (eq longlines-mode-val 1) + (longlines-mode longlines-mode-val)) + ))) + (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 (lambda (elt) + (let ((state-of-merge (aref elt 9)) + (state-of-ancestor (aref elt 10))) + (vector + ;; state of merge: prefers/default-A/B or combined + (if state-of-merge (format "%S" state-of-merge)) + ;; whether the ancestor region is empty + 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)) + (ctl-buf ediff-control-buffer) + ;; 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)) + (ediff-with-current-buffer ctl-buf + (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 2-d elt, nil, is a place holder for the fine diff vector. + ;; The 3-d elt, nil, is a place holder for no-fine-diffs flag. + ;; The 4-th elt says which diff region is different from the other two + ;; (3-way jobs only). + (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 the auto-refinement 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 ((and (eq ediff-auto-refine 'on) + ediff-use-faces + (not (eq ediff-highlighting-style 'off)) + (not (eq ediff-highlighting-style 'ascii))) + (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 if 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 + (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 (lambda (overl) + (ediff-set-overlay-face overl face) + (ediff-overlay-put overl 'priority priority)) + fine-diff-vector))) + +;; Set overlays over the regions that denote delimiters +(defun ediff-set-fine-overlays-for-combined-merge (diff-list reg-num) + (let (overlay overlay-list) + (while diff-list + (condition-case nil + (setq overlay + (ediff-make-bullet-proof-overlay + (nth 0 diff-list) (nth 1 diff-list) ediff-buffer-C)) + (error "")) + (setq overlay-list (cons overlay overlay-list)) + (if (> (length diff-list) 1) + (setq diff-list (cdr (cdr diff-list))) + (error "ediff-set-fine-overlays-for-combined-merge: corrupt list of +delimiter regions")) + ) + (setq overlay-list (reverse overlay-list)) + (ediff-set-fine-diff-vector + reg-num 'C (apply 'vector overlay-list)) + )) + + +;; 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)) + (ctl-buf ediff-control-buffer) + 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 + (ediff-with-current-buffer ctl-buf + (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)) + ))) + + +(defun ediff-convert-fine-diffs-to-overlays (diff-list region-num) + (ediff-set-fine-overlays-in-one-buffer 'A diff-list region-num) + (ediff-set-fine-overlays-in-one-buffer 'B diff-list region-num) + (if ediff-3way-job + (ediff-set-fine-overlays-in-one-buffer 'C diff-list region-num) + )) + + +;; 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]\\)\C-m?$")) + (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-number + (buffer-substring (match-beginning 1) (match-end 1))) + (1+ (string-to-number + (buffer-substring (match-beginning 3) (match-end 3))))) + ;; it has one number + (let ((x (string-to-number + (buffer-substring (match-beginning 1) (match-end 1))))) + (list x (1+ x)))) + ;; it is an "a" group + (let ((x (1+ (string-to-number + (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 + (a-prev-pt nil) + (b-prev 1) + (b-prev-pt nil) + (c-prev 1) + (c-prev-pt nil) + (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 + (let ((longlines-mode-val + (if (and (boundp 'longlines-mode) longlines-mode) 1 0))) + ;; we must disable and then restore longlines-mode + (if (eq longlines-mode-val 1) + (longlines-mode 0)) + (goto-char (or a-prev-pt shift-A (point-min))) + (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 + a-prev-pt a-end-pt) + (if (eq longlines-mode-val 1) + (longlines-mode longlines-mode-val)) + )) + (ediff-with-current-buffer B-buffer + (let ((longlines-mode-val + (if (and (boundp 'longlines-mode) longlines-mode) 1 0))) + (if (eq longlines-mode-val 1) + (longlines-mode 0)) + (goto-char (or b-prev-pt shift-B (point-min))) + (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 + b-prev-pt b-end-pt) + (if (eq longlines-mode-val 1) + (longlines-mode longlines-mode-val)) + )) + (ediff-with-current-buffer C-buffer + (let ((longlines-mode-val + (if (and (boundp 'longlines-mode) longlines-mode) 1 0))) + (if (eq longlines-mode-val 1) + (longlines-mode 0)) + (goto-char (or c-prev-pt shift-C (point-min))) + (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 + c-prev-pt c-end-pt) + (if (eq longlines-mode-val 1) + (longlines-mode longlines-mode-val)) + )) + (if (ediff-buffer-live-p anc-buffer) + (ediff-with-current-buffer anc-buffer + (let ((longlines-mode-val + (if (and (boundp 'longlines-mode) longlines-mode) 1 0))) + (if (eq longlines-mode-val 1) + (longlines-mode 0)) + (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) + (if (eq longlines-mode-val 1) + (longlines-mode longlines-mode-val)) + ))) + (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) + ;; looking for '-i' or a 'i' among clustered non-long options + (if (string-match "^-i\\| -i\\|\\(^\\| \\)-[^- ]+i" ediff-diff-options) + (error "Option `-i' is not allowed in `ediff-diff3-options'")) + + (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-actual-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)) + ;; If this is a buffer job, we are diffing temporary files + ;; produced by Emacs with ediff-coding-system-for-write, so + ;; use the same encoding to read the results. + (coding-system-for-read + (if (string-match "buffer" (symbol-name ediff-job-name)) + ediff-coding-system-for-write + ediff-coding-system-for-read)) + args) + (setq args (append (split-string options) files)) + (setq args (delete "" (delq nil args))) ; delete nil and "" from arguments + ;; the --binary option, if present, should be used only for buffer jobs + ;; or for refining the differences + (or (string-match "buffer" (symbol-name ediff-job-name)) + (eq buffer ediff-fine-diff-buffer) + (setq args (delete "--binary" args))) + (unwind-protect + (let ((directory default-directory) + proc) + (with-current-buffer buffer + (erase-buffer) + (setq default-directory directory) + (if (or (memq system-type '(ms-dos windows-nt)) + synch) + ;; In Windows do it synchronously, since Windows 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. + ;; 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 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 + (with-current-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.") +(make-variable-buffer-local 'ediff-forward-word-function) + +;; \240 is unicode symbol for nonbreakable whitespace +(defvar ediff-whitespace " \n\t\f\r\240" + "*Characters constituting white space. +These characters are ignored when differing regions are split into words.") +(make-variable-buffer-local 'ediff-whitespace) + +(defvar ediff-word-1 + (if (featurep 'xemacs) "a-zA-Z---_" "-[:word:]_") + "*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.") +(make-variable-buffer-local 'ediff-word-1) + +(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.") +(make-variable-buffer-local 'ediff-word-2) + +(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.") +(make-variable-buffer-local 'ediff-word-3) + +(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.") +(make-variable-buffer-local 'ediff-word-4) + +;; 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 one after another as +arguments to `skip-chars-forward'." + (or (> (+ (skip-chars-forward ediff-word-1) + (skip-syntax-forward "w")) + 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 ((forward-word-function + ;; eval in control buf to let user create local versions for + ;; different invocations + (if control-buf + (ediff-with-current-buffer control-buf + ediff-forward-word-function) + ediff-forward-word-function)) + inbuf-syntax-tbl sv-point diff-string) + (with-current-buffer in-buffer + (setq inbuf-syntax-tbl + (if control-buf + (ediff-with-current-buffer control-buf + ediff-syntax-table) + (syntax-table))) + (setq diff-string (buffer-substring-no-properties beg end)) + + (set-buffer out-buffer) + ;; Make sure that temp buff syntax table is the same as the original buf + ;; syntax tbl, because we use ediff-forward-word in both and + ;; ediff-forward-word depends on the syntax classes of characters. + (set-syntax-table inbuf-syntax-tbl) + (erase-buffer) + (insert diff-string) + (goto-char (point-min)) + (skip-chars-forward ediff-whitespace) + (delete-region (point-min) (point)) + + (while (not (eobp)) + (funcall forward-word-function) + (setq sv-point (point)) + (skip-chars-forward ediff-whitespace) + (delete-region sv-point (point)) + (insert "\n"))))) + +;; copy string specified as BEG END from IN-BUF to OUT-BUF +(defun ediff-copy-to-buffer (beg end in-buffer out-buffer) + (with-current-buffer out-buffer + (erase-buffer) + (insert-buffer-substring in-buffer beg end) + (goto-char (point-min)))) + + +;; goto word #n starting at current position in buffer `buf' +;; For ediff, a word is determined by ediff-forward-word-function +;; 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) + (syntax-tbl ediff-syntax-table)) + (ediff-with-current-buffer buf + (skip-chars-forward ediff-whitespace) + (ediff-with-syntax-table syntax-tbl + (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) + "Return t if files F1 and F2 have identical contents." + (if (and (not (file-directory-p f1)) + (not (file-directory-p f2))) + (let ((res + (apply 'call-process ediff-cmp-program nil nil nil + (append ediff-cmp-options (list (expand-file-name f1) + (expand-file-name f2)))) + )) + (and (numberp res) (eq res 0))) + )) + + +(defun ediff-same-contents (d1 d2 &optional filter-re) + "Return t if D1 and D2 have the same content. +D1 and D2 can either be both directories or both regular files. +Symlinks and the likes are not handled. +If FILTER-RE is non-nil, recursive checking in directories +affects only files whose names match the expression." + ;; Normalize empty filter RE to nil. + (unless (> (length filter-re) 0) (setq filter-re nil)) + ;; Indicate progress + (message "Comparing '%s' and '%s' modulo '%s'" d1 d2 filter-re) + (cond + ;; D1 & D2 directories => recurse + ((and (file-directory-p d1) + (file-directory-p d2)) + (if (null ediff-recurse-to-subdirectories) + (if (y-or-n-p "Compare subdirectories recursively? ") + (setq ediff-recurse-to-subdirectories 'yes) + (setq ediff-recurse-to-subdirectories 'no))) + (if (eq ediff-recurse-to-subdirectories 'yes) + (let* ((all-entries-1 (directory-files d1 t filter-re)) + (all-entries-2 (directory-files d2 t filter-re)) + (entries-1 (ediff-delete-all-matches "^\\.\\.?$" all-entries-1)) + (entries-2 (ediff-delete-all-matches "^\\.\\.?$" all-entries-2)) + ) + + (ediff-same-file-contents-lists entries-1 entries-2 filter-re) + )) + ) ; end of the directories case + ;; D1 & D2 are both files => compare directly + ((and (file-regular-p d1) + (file-regular-p d2)) + (ediff-same-file-contents d1 d2)) + ;; Otherwise => false: unequal contents + ) + ) + +;; If lists have the same length and names of files are pairwise equal +;; (removing the directories) then compare contents pairwise. +;; True if all contents are the same; false otherwise +(defun ediff-same-file-contents-lists (entries-1 entries-2 filter-re) + ;; First, check only the names (works quickly and ensures a + ;; precondition for subsequent code) + (if (and (= (length entries-1) (length entries-2)) + (equal (mapcar 'file-name-nondirectory entries-1) + (mapcar 'file-name-nondirectory entries-2))) + ;; With name equality established, compare the entries + ;; through recursion. + (let ((continue t)) + (while (and entries-1 continue) + (if (ediff-same-contents + (car entries-1) (car entries-2) filter-re) + (setq entries-1 (cdr entries-1) + entries-2 (cdr entries-2)) + (setq continue nil)) + ) + ;; if reached the end then lists are equal + (null entries-1)) + ) + ) + + +;; ARG1 is a regexp, ARG2 is a list of full-filenames +;; Delete all entries that match the regexp +(defun ediff-delete-all-matches (regex file-list-list) + (let (result elt) + (while file-list-list + (setq elt (car file-list-list)) + (or (string-match regex (file-name-nondirectory elt)) + (setq result (cons elt result))) + (setq file-list-list (cdr file-list-list))) + (reverse result))) + + +(defun ediff-set-actual-diff-options () + (if ediff-ignore-case + (setq ediff-actual-diff-options + (concat ediff-diff-options " " ediff-ignore-case-option) + ediff-actual-diff3-options + (concat ediff-diff3-options " " ediff-ignore-case-option3)) + (setq ediff-actual-diff-options ediff-diff-options + ediff-actual-diff3-options ediff-diff3-options) + ) + (setq-default ediff-actual-diff-options ediff-actual-diff-options + ediff-actual-diff3-options ediff-actual-diff3-options) + ) + + +;; Ignore case handling - some ideas from drew.adams@@oracle.com +(defun ediff-toggle-ignore-case () + (interactive) + (ediff-barf-if-not-control-buffer) + (setq ediff-ignore-case (not ediff-ignore-case)) + (ediff-set-actual-diff-options) + (if ediff-ignore-case + (message "Ignoring regions that differ only in case") + (message "Ignoring case differences turned OFF")) + (cond (ediff-merge-job + (message "Ignoring letter case is too dangerous in merge jobs")) + ((and ediff-diff3-job (string= ediff-ignore-case-option3 "")) + (message "Ignoring letter case is not supported by this diff3 program")) + ((and (not ediff-3way-job) (string= ediff-ignore-case-option "")) + (message "Ignoring letter case is not supported by this diff program")) + (t + (sit-for 1) + (ediff-update-diffs))) + ) + + + +;; 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 |