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321 lines
11 KiB
EmacsLisp
321 lines
11 KiB
EmacsLisp
;;; diff.el --- Run `diff' in compilation-mode.
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;; Copyright (C) 1992, 1994, 1996 Free Software Foundation, Inc.
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;; Keywords: unix, tools
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package helps you explore differences between files, using the
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;; UNIX command diff(1). The commands are `diff' and `diff-backup'.
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;; You can specify options with `diff-switches'.
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;;; Code:
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(require 'compile)
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(defgroup diff nil
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"Comparing files with `diff'."
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:group 'tools)
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;;;###autoload
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(defcustom diff-switches "-c"
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"*A string or list of strings specifying switches to be be passed to diff."
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:type '(choice string (repeat string))
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:group 'diff)
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;;;###autoload
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(defcustom diff-command "diff"
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"*The command to use to run diff."
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:type 'string
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:group 'diff)
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(defvar diff-regexp-alist
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'(
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;; -u format: @@ -OLDSTART,OLDEND +NEWSTART,NEWEND @@
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("^@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@$" 1 2)
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;; -c format: *** OLDSTART,OLDEND ****
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("^\\*\\*\\* \\([0-9]+\\),[0-9]+ \\*\\*\\*\\*$" 1 nil)
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;; --- NEWSTART,NEWEND ----
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("^--- \\([0-9]+\\),[0-9]+ ----$" nil 1)
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;; plain diff format: OLDSTART[,OLDEND]{a,d,c}NEWSTART[,NEWEND]
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("^\\([0-9]+\\)\\(,[0-9]+\\)?[adc]\\([0-9]+\\)\\(,[0-9]+\\)?$" 1 3)
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;; -e (ed) format: OLDSTART[,OLDEND]{a,d,c}
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("^\\([0-9]+\\)\\(,[0-9]+\\)?[adc]$" 1)
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;; -f format: {a,d,c}OLDSTART[ OLDEND]
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;; -n format: {a,d,c}OLDSTART LINES-CHANGED
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("^[adc]\\([0-9]+\\)\\( [0-9]+\\)?$" 1)
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)
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"Alist (REGEXP OLD-IDX NEW-IDX) of regular expressions to match difference
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sections in \\[diff] output. If REGEXP matches, the OLD-IDX'th
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subexpression gives the line number in the old file, and NEW-IDX'th
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subexpression gives the line number in the new file. If OLD-IDX or NEW-IDX
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is nil, REGEXP matches only half a section.")
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(defvar diff-old-file nil
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"This is the old file name in the comparison in this buffer.")
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(defvar diff-new-file nil
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"This is the new file name in the comparison in this buffer.")
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(defvar diff-old-temp-file nil
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"This is the name of a temp file to be deleted after diff finishes.")
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(defvar diff-new-temp-file nil
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"This is the name of a temp file to be deleted after diff finishes.")
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;; See compilation-parse-errors-function (compile.el).
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(defun diff-parse-differences (limit-search find-at-least)
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(setq compilation-error-list nil)
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(message "Parsing differences...")
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;; Don't reparse diffs already seen at last parse.
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(if compilation-parsing-end (goto-char compilation-parsing-end))
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;; Construct in REGEXP a regexp composed of all those in dired-regexp-alist.
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(let ((regexp (mapconcat (lambda (elt)
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(concat "\\(" (car elt) "\\)"))
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diff-regexp-alist
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"\\|"))
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;; (GROUP-IDX OLD-IDX NEW-IDX)
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(groups (let ((subexpr 1))
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(mapcar (lambda (elt)
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(prog1
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(cons subexpr
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(mapcar (lambda (n)
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(and n
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(+ subexpr n)))
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(cdr elt)))
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(setq subexpr (+ subexpr 1
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(count-regexp-groupings
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(car elt))))))
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diff-regexp-alist)))
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(new-error
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(function (lambda (file subexpr)
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(setq compilation-error-list
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(cons
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(cons (save-excursion
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;; Report location of message
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;; at beginning of line.
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(goto-char
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(match-beginning subexpr))
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(beginning-of-line)
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(point-marker))
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;; Report location of corresponding text.
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(let ((line (string-to-int
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(buffer-substring
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(match-beginning subexpr)
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(match-end subexpr)))))
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(save-excursion
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(save-match-data
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(set-buffer (find-file-noselect file)))
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(save-excursion
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(goto-line line)
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(point-marker)))))
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compilation-error-list)))))
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(found-desired nil)
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(num-loci-found 0)
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g)
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(while (and (not found-desired)
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;; We don't just pass LIMIT-SEARCH to re-search-forward
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;; because we want to find matches containing LIMIT-SEARCH
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;; but which extend past it.
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(re-search-forward regexp nil t))
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;; Find which individual regexp matched.
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(setq g groups)
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(while (and g (null (match-beginning (car (car g)))))
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(setq g (cdr g)))
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(setq g (car g))
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(if (nth 1 g) ;OLD-IDX
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(funcall new-error diff-old-file (nth 1 g)))
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(if (nth 2 g) ;NEW-IDX
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(funcall new-error diff-new-file (nth 2 g)))
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(setq num-loci-found (1+ num-loci-found))
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(if (or (and find-at-least
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(>= num-loci-found find-at-least))
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(and limit-search (>= (point) limit-search)))
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;; We have found as many new loci as the user wants,
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;; or the user wanted a specific diff, and we're past it.
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(setq found-desired t)))
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(if found-desired
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(setq compilation-parsing-end (point))
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;; Set to point-max, not point, so we don't perpetually
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;; parse the last bit of text when it isn't a diff header.
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(setq compilation-parsing-end (point-max)))
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(message "Parsing differences...done"))
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(setq compilation-error-list (nreverse compilation-error-list)))
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(defun diff-process-setup ()
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"Set up \`compilation-exit-message-function' for \`diff'."
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;; Avoid frightening people with "abnormally terminated"
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;; if diff finds differences.
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(set (make-local-variable 'compilation-exit-message-function)
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(lambda (status code msg)
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(cond ((not (eq status 'exit))
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(cons msg code))
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((zerop code)
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'("finished (no differences)\n" . "no differences"))
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((= code 1)
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'("finished\n" . "differences found"))
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(t
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(cons msg code))))))
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;;;###autoload
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(defun diff (old new &optional switches)
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"Find and display the differences between OLD and NEW files.
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Interactively the current buffer's file name is the default for NEW
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and a backup file for NEW is the default for OLD.
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With prefix arg, prompt for diff switches."
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(interactive
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(nconc
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(let (oldf newf)
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(nreverse
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(list
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(setq newf (buffer-file-name)
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newf (if (and newf (file-exists-p newf))
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(read-file-name
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(concat "Diff new file: ("
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(file-name-nondirectory newf) ") ")
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nil newf t)
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(read-file-name "Diff new file: " nil nil t)))
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(setq oldf (file-newest-backup newf)
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oldf (if (and oldf (file-exists-p oldf))
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(read-file-name
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(concat "Diff original file: ("
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(file-name-nondirectory oldf) ") ")
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(file-name-directory oldf) oldf t)
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(read-file-name "Diff original file: "
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(file-name-directory newf) nil t))))))
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(if current-prefix-arg
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(list (read-string "Diff switches: "
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(if (stringp diff-switches)
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diff-switches
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(mapconcat 'identity diff-switches " "))))
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nil)))
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(setq new (expand-file-name new)
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old (expand-file-name old))
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(let ((old-alt (file-local-copy old))
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(new-alt (file-local-copy new))
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buf)
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(save-excursion
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(let ((compilation-process-setup-function 'diff-process-setup)
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(command
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(mapconcat 'identity
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(append (list diff-command)
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;; Use explicitly specified switches
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(if switches
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(if (consp switches)
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switches (list switches))
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;; If not specified, use default.
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(if (consp diff-switches)
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diff-switches
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(list diff-switches)))
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(if (or old-alt new-alt)
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(list "-L" old "-L" new))
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(list
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(shell-quote-argument (or old-alt old)))
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(list
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(shell-quote-argument (or new-alt new))))
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" ")))
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(setq buf
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(compile-internal command
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"No more differences" "Diff"
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'diff-parse-differences))
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(set-buffer buf)
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(set (make-local-variable 'diff-old-file) old)
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(set (make-local-variable 'diff-new-file) new)
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(set (make-local-variable 'diff-old-temp-file) old-alt)
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(set (make-local-variable 'diff-new-temp-file) new-alt)
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(set (make-local-variable 'compilation-finish-function)
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(function (lambda (buff msg)
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(if diff-old-temp-file
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(delete-file diff-old-temp-file))
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(if diff-new-temp-file
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(delete-file diff-new-temp-file)))))
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;; When async processes aren't available, the compilation finish
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;; function doesn't get chance to run. Invoke it by hand.
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(or (fboundp 'start-process)
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(funcall compilation-finish-function nil nil))
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buf))))
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;;;###autoload
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(defun diff-backup (file &optional switches)
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"Diff this file with its backup file or vice versa.
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Uses the latest backup, if there are several numerical backups.
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If this file is a backup, diff it with its original.
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The backup file is the first file given to `diff'."
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(interactive (list (read-file-name "Diff (file with backup): ")
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(if current-prefix-arg
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(read-string "Diff switches: "
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(if (stringp diff-switches)
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diff-switches
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(mapconcat 'identity
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diff-switches " ")))
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nil)))
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(let (bak ori)
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(if (backup-file-name-p file)
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(setq bak file
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ori (file-name-sans-versions file))
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(setq bak (or (diff-latest-backup-file file)
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(error "No backup found for %s" file))
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ori file))
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(diff bak ori switches)))
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(defun diff-latest-backup-file (fn) ; actually belongs into files.el
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"Return the latest existing backup of FILE, or nil."
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(let ((handler (find-file-name-handler fn 'diff-latest-backup-file)))
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(if handler
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(funcall handler 'diff-latest-backup-file fn)
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;; First try simple backup, then the highest numbered of the
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;; numbered backups.
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;; Ignore the value of version-control because we look for existing
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;; backups, which maybe were made earlier or by another user with
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;; a different value of version-control.
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(setq fn (file-chase-links (expand-file-name fn)))
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(or
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(let ((bak (make-backup-file-name fn)))
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(if (file-exists-p bak) bak))
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;; We use BACKUPNAME to cope with backups stored in a different dir.
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(let* ((backupname (car (find-backup-file-name fn)))
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(dir (file-name-directory backupname))
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(base-versions (concat (file-name-sans-versions
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(file-name-nondirectory backupname))
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".~"))
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;; This is a fluid var for backup-extract-version.
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(backup-extract-version-start (length base-versions)))
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(concat dir
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(car (sort
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(file-name-all-completions base-versions dir)
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(function
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(lambda (fn1 fn2)
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(> (backup-extract-version fn1)
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(backup-extract-version fn2))))))))))))
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(provide 'diff)
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;;; diff.el ends here
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