mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
265 lines
8.9 KiB
EmacsLisp
265 lines
8.9 KiB
EmacsLisp
;;; diff.el --- Run `diff' in compilation-mode.
|
|
|
|
;; Copyright (C) 1992 Free Software Foundation, Inc.
|
|
|
|
;; Keywords: unix, tools
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 2, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs; see the file COPYING. If not, write to
|
|
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
;;; Code:
|
|
|
|
(require 'compile)
|
|
|
|
(defvar diff-switches "-c"
|
|
"*A string or list of strings specifying switches to be be passed to diff.")
|
|
|
|
(defvar diff-regexp-alist
|
|
'(
|
|
;; -u format: @@ -OLDSTART,OLDEND +NEWSTART,NEWEND @@
|
|
("^@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@$" 1 2)
|
|
|
|
;; -c format: *** OLDSTART,OLDEND ****
|
|
("^\\*\\*\\* \\([0-9]+\\),[0-9]+ \\*\\*\\*\\*$" 1 nil)
|
|
;; --- NEWSTART,NEWEND ----
|
|
("^--- \\([0-9]+\\),[0-9]+ ----$" nil 1)
|
|
|
|
;; plain diff format: OLDSTART[,OLDEND]{a,d,c}NEWSTART[,NEWEND]
|
|
("^\\([0-9]+\\)\\(,[0-9]+\\)?[adc]\\([0-9]+\\)\\(,[0-9]+\\)?$" 1 3)
|
|
|
|
;; -e (ed) format: OLDSTART[,OLDEND]{a,d,c}
|
|
("^\\([0-9]+\\)\\(,[0-9]+\\)?[adc]$" 1)
|
|
|
|
;; -f format: {a,d,c}OLDSTART[ OLDEND]
|
|
;; -n format: {a,d,c}OLDSTART LINES-CHANGED
|
|
("^[adc]\\([0-9]+\\)\\( [0-9]+\\)?$" 1)
|
|
)
|
|
"Alist (REGEXP OLD-IDX NEW-IDX) of regular expressions to match difference
|
|
sections in \\[diff] output. If REGEXP matches, the OLD-IDX'th
|
|
subexpression gives the line number in the old file, and NEW-IDX'th
|
|
subexpression gives the line number in the new file. If OLD-IDX or NEW-IDX
|
|
is nil, REGEXP matches only half a section.")
|
|
|
|
(defvar diff-old-file nil
|
|
"This is the old file name in the comparison in this buffer.")
|
|
(defvar diff-new-file nil
|
|
"This is the new file name in the comparison in this buffer.")
|
|
(defvar diff-old-temp-file nil
|
|
"This is the name of a temp file to be deleted after diff finishes.")
|
|
(defvar diff-new-temp-file nil
|
|
"This is the name of a temp file to be deleted after diff finishes.")
|
|
|
|
;; See compilation-parse-errors-function (compile.el).
|
|
(defun diff-parse-differences (limit-search find-at-least)
|
|
(setq compilation-error-list nil)
|
|
(message "Parsing differences...")
|
|
|
|
;; Don't reparse diffs already seen at last parse.
|
|
(goto-char compilation-parsing-end)
|
|
|
|
;; Construct in REGEXP a regexp composed of all those in dired-regexp-alist.
|
|
(let ((regexp (mapconcat (lambda (elt)
|
|
(concat "\\(" (car elt) "\\)"))
|
|
diff-regexp-alist
|
|
"\\|"))
|
|
;; (GROUP-IDX OLD-IDX NEW-IDX)
|
|
(groups (let ((subexpr 1))
|
|
(mapcar (lambda (elt)
|
|
(prog1
|
|
(cons subexpr
|
|
(mapcar (lambda (n)
|
|
(and n
|
|
(+ subexpr n)))
|
|
(cdr elt)))
|
|
(setq subexpr (+ subexpr 1
|
|
(count-regexp-groupings
|
|
(car elt))))))
|
|
diff-regexp-alist)))
|
|
|
|
(new-error
|
|
(function (lambda (file subexpr)
|
|
(setq compilation-error-list
|
|
(cons
|
|
(cons (save-excursion
|
|
;; Report location of message
|
|
;; at beginning of line.
|
|
(goto-char
|
|
(match-beginning subexpr))
|
|
(beginning-of-line)
|
|
(point-marker))
|
|
;; Report location of corresponding text.
|
|
(let ((line (string-to-int
|
|
(buffer-substring
|
|
(match-beginning subexpr)
|
|
(match-end subexpr)))))
|
|
(save-excursion
|
|
(set-buffer (find-file-noselect file))
|
|
(save-excursion
|
|
(goto-line line)
|
|
(point-marker)))))
|
|
compilation-error-list)))))
|
|
|
|
(found-desired nil)
|
|
(num-loci-found 0)
|
|
g)
|
|
|
|
(while (and (not found-desired)
|
|
;; We don't just pass LIMIT-SEARCH to re-search-forward
|
|
;; because we want to find matches containing LIMIT-SEARCH
|
|
;; but which extend past it.
|
|
(re-search-forward regexp nil t))
|
|
|
|
;; Find which individual regexp matched.
|
|
(setq g groups)
|
|
(while (and g (null (match-beginning (car (car g)))))
|
|
(setq g (cdr g)))
|
|
(setq g (car g))
|
|
|
|
(if (nth 1 g) ;OLD-IDX
|
|
(funcall new-error diff-old-file (nth 1 g)))
|
|
(if (nth 2 g) ;NEW-IDX
|
|
(funcall new-error diff-new-file (nth 2 g)))
|
|
|
|
(setq num-loci-found (1+ num-loci-found))
|
|
(if (or (and find-at-least
|
|
(>= num-loci-found find-at-least))
|
|
(and limit-search (>= (point) limit-search)))
|
|
;; We have found as many new loci as the user wants,
|
|
;; or the user wanted a specific diff, and we're past it.
|
|
(setq found-desired t)))
|
|
(if found-desired
|
|
(setq compilation-parsing-end (point))
|
|
;; Set to point-max, not point, so we don't perpetually
|
|
;; parse the last bit of text when it isn't a diff header.
|
|
(setq compilation-parsing-end (point-max)))
|
|
(message "Parsing differences...done"))
|
|
(setq compilation-error-list (nreverse compilation-error-list)))
|
|
|
|
;;;###autoload
|
|
(defun diff (old new &optional switches)
|
|
"Find and display the differences between OLD and NEW files.
|
|
Interactively the current buffer's file name is the default for for NEW
|
|
and a backup file for NEW is the default for OLD.
|
|
With prefix arg, prompt for diff switches."
|
|
(interactive
|
|
(nconc
|
|
(let (oldf newf)
|
|
(nreverse
|
|
(list
|
|
(setq newf (buffer-file-name)
|
|
newf (if (and newf (file-exists-p newf))
|
|
(read-file-name
|
|
(concat "Diff new file: ("
|
|
(file-name-nondirectory newf) ") ")
|
|
nil newf t)
|
|
(read-file-name "Diff new file: " nil nil t)))
|
|
(setq oldf (file-newest-backup newf)
|
|
oldf (if (and oldf (file-exists-p oldf))
|
|
(read-file-name
|
|
(concat "Diff original file: ("
|
|
(file-name-nondirectory oldf) ") ")
|
|
(file-name-directory oldf) oldf t)
|
|
(read-file-name "Diff original file: "
|
|
(file-name-directory newf) nil t))))))
|
|
(if current-prefix-arg
|
|
(list (read-string "Diff switches: "
|
|
(if (stringp diff-switches)
|
|
diff-switches
|
|
(mapconcat 'identity diff-switches " "))))
|
|
nil)))
|
|
(setq new (expand-file-name new)
|
|
old (expand-file-name old))
|
|
(let ((old-alt (file-local-copy old))
|
|
(new-alt (file-local-copy new))
|
|
buf)
|
|
(unwind-protect
|
|
(let ((command
|
|
(mapconcat 'identity
|
|
(append '("diff")
|
|
(if (consp diff-switches)
|
|
diff-switches
|
|
(list diff-switches))
|
|
(if (or old-alt new-alt)
|
|
(list "-L" old "-L" new))
|
|
(list (or old-alt old))
|
|
(list (or new-alt new)))
|
|
" ")))
|
|
(setq buf
|
|
(compile-internal command
|
|
"No more differences" "Diff"
|
|
'diff-parse-differences))
|
|
(save-excursion
|
|
(set-buffer buf)
|
|
(set (make-local-variable 'diff-old-file) old)
|
|
(set (make-local-variable 'diff-new-file) new)
|
|
(set (make-local-variable 'diff-old-temp-file) old-alt)
|
|
(set (make-local-variable 'diff-new-temp-file) new-alt)
|
|
(set (make-local-variable 'compilation-finish-function)
|
|
(function (lambda (buff msg)
|
|
(if diff-old-temp-file
|
|
(delete-file diff-old-temp-file))
|
|
(if diff-new-temp-file
|
|
(delete-file diff-new-temp-file))))))
|
|
buf))))
|
|
|
|
;;;###autoload
|
|
(defun diff-backup (file &optional switches)
|
|
"Diff this file with its backup file or vice versa.
|
|
Uses the latest backup, if there are several numerical backups.
|
|
If this file is a backup, diff it with its original.
|
|
The backup file is the first file given to `diff'."
|
|
(interactive (list (read-file-name "Diff (file with backup): ")
|
|
(if current-prefix-arg
|
|
(read-string "Diff switches: "
|
|
(if (stringp diff-switches)
|
|
diff-switches
|
|
(mapconcat 'identity
|
|
diff-switches " ")))
|
|
nil)))
|
|
(let (bak ori)
|
|
(if (backup-file-name-p file)
|
|
(setq bak file
|
|
ori (file-name-sans-versions file))
|
|
(setq bak (or (diff-latest-backup-file file)
|
|
(error "No backup found for %s" file))
|
|
ori file))
|
|
(diff bak ori switches)))
|
|
|
|
(defun diff-latest-backup-file (fn) ; actually belongs into files.el
|
|
"Return the latest existing backup of FILE, or nil."
|
|
;; First try simple backup, then the highest numbered of the
|
|
;; numbered backups.
|
|
;; Ignore the value of version-control because we look for existing
|
|
;; backups, which maybe were made earlier or by another user with
|
|
;; a different value of version-control.
|
|
(setq fn (expand-file-name fn))
|
|
(or
|
|
(let ((bak (make-backup-file-name fn)))
|
|
(if (file-exists-p bak) bak))
|
|
(let* ((dir (file-name-directory fn))
|
|
(base-versions (concat (file-name-nondirectory fn) ".~"))
|
|
(bv-length (length base-versions)))
|
|
(concat dir
|
|
(car (sort
|
|
(file-name-all-completions base-versions dir)
|
|
;; bv-length is a fluid var for backup-extract-version:
|
|
(function
|
|
(lambda (fn1 fn2)
|
|
(> (backup-extract-version fn1)
|
|
(backup-extract-version fn2))))))))))
|
|
|
|
;;; diff.el ends here
|