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200 lines
6.9 KiB
EmacsLisp
200 lines
6.9 KiB
EmacsLisp
;;; diff.el --- run `diff' in compilation-mode
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;; Copyright (C) 1992, 1994, 1996, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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;; Maintainer: FSF
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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 3, 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., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, 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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(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 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-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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;; prompt if prefix arg present
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(defun diff-switches ()
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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 diff-switches " ")))))
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(defun diff-sentinel (code)
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"Code run when the diff process exits.
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CODE is the exit code of the process. It should be 0 only if no diffs
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were found."
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(if diff-old-temp-file (delete-file diff-old-temp-file))
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(if diff-new-temp-file (delete-file diff-new-temp-file))
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(save-excursion
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(goto-char (point-max))
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(let ((inhibit-read-only t))
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(insert (format "\nDiff finished%s. %s\n"
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(if (equal 0 code) " (no differences)" "")
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(current-time-string))))))
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(defvar diff-old-file nil)
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(defvar diff-new-file nil)
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(defvar diff-extra-args nil)
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;;;###autoload
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(defun diff (old new &optional switches no-async)
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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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If NO-ASYNC is non-nil, call diff synchronously.
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With prefix arg, prompt for diff switches."
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(interactive
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(let (oldf newf)
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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 (default "
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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 (default "
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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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(list oldf newf (diff-switches))))
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(setq new (expand-file-name new)
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old (expand-file-name old))
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(or switches (setq switches diff-switches)) ; If not specified, use default.
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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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(command
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(mapconcat 'identity
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`(,diff-command
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;; Use explicitly specified switches
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,@(if (listp switches) switches (list switches))
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,@(if (or old-alt new-alt)
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(list "-L" old "-L" new))
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,(shell-quote-argument (or old-alt old))
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,(shell-quote-argument (or new-alt new)))
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" "))
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(buf (get-buffer-create "*Diff*"))
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(thisdir default-directory)
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proc)
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(save-excursion
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(display-buffer buf)
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(set-buffer buf)
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(setq buffer-read-only nil)
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(buffer-disable-undo (current-buffer))
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(let ((inhibit-read-only t))
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(erase-buffer))
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(buffer-enable-undo (current-buffer))
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(diff-mode)
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;; Use below 2 vars for backward-compatibility.
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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-extra-args) (list switches no-async))
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(set (make-local-variable 'revert-buffer-function)
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(lambda (ignore-auto noconfirm)
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(apply 'diff diff-old-file diff-new-file diff-extra-args)))
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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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(setq default-directory thisdir)
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(let ((inhibit-read-only t))
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(insert command "\n"))
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(if (and (not no-async) (fboundp 'start-process))
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(progn
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(setq proc (start-process "Diff" buf shell-file-name
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shell-command-switch command))
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(set-process-filter proc 'diff-process-filter)
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(set-process-sentinel
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proc (lambda (proc msg)
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(with-current-buffer (process-buffer proc)
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(diff-sentinel (process-exit-status proc))))))
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;; Async processes aren't available.
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(let ((inhibit-read-only t))
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(diff-sentinel
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(call-process shell-file-name nil buf nil
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shell-command-switch command)))))
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buf))
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(defun diff-process-filter (proc string)
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(with-current-buffer (process-buffer proc)
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(let ((moving (= (point) (process-mark proc))))
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(save-excursion
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;; Insert the text, advancing the process marker.
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(goto-char (process-mark proc))
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(let ((inhibit-read-only t))
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(insert string))
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(set-marker (process-mark proc) (point)))
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(if moving (goto-char (process-mark proc))))))
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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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With prefix arg, prompt for diff switches."
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(interactive (list (read-file-name "Diff (file with backup): ")
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(diff-switches)))
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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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(file-newest-backup fn))))
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(provide 'diff)
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;; arch-tag: 7de2c29b-7ea5-4b85-9b9d-72dd860de2bd
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;;; diff.el ends here
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