;;; ediff-ptch.el --- Ediff's patch support
-;; Copyright (C) 1996, 97, 98, 99, 2000, 01, 02 Free Software Foundation, Inc.
+;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+;; 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
;; Author: Michael Kifer <kifer@cs.stonybrook.edu>
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
-(provide 'ediff-ptch)
(defgroup ediff-ptch nil
- "Ediff patch support"
+ "Ediff patch support."
:tag "Patch"
:prefix "ediff-"
:group 'ediff)
;; strip prefix from filename
;; returns /dev/null, if can't strip prefix
(defsubst ediff-file-name-sans-prefix (filename prefix)
- (save-match-data
- (if (string-match (concat "^" prefix) filename)
- (substring filename (match-end 0))
- (concat "/null/" filename))))
+ (if prefix
+ (save-match-data
+ (if (string-match (concat "^" (if (stringp prefix)
+ (regexp-quote prefix)
+ ""))
+ filename)
+ (substring filename (match-end 0))
+ (concat "/null/" filename)))
+ filename)
+ )
count)))
;; Fix up the file names in the list using the argument FILENAME
-;; Algorithm: find the first file's directory and cut it out from each file
-;; name in the patch. Prepend the directory of FILENAME to each file in the
-;; patch. In addition, the first file in the patch is replaced by FILENAME.
-;; Each file is actually a file-pair of files found in the context diff header
-;; In the end, for each pair, we select the shortest existing file.
+;; Algorithm: find the files' directories in the patch and, if a directory is
+;; absolute, cut it out from the corresponding file name in the patch.
+;; Relative directories are not cut out.
+;; Prepend the directory of FILENAME to each resulting file (which came
+;; originally from the patch).
+;; In addition, the first file in the patch document is replaced by FILENAME.
+;; Each file is actually a pair of files found in the context diff header
+;; In the end, for each pair, we ask the user which file to patch.
;; Note: Ediff doesn't recognize multi-file patches that are separated
;; with the `Index:' line. It treats them as a single-file patch.
;;
;; directory part of filename
(file-name-as-directory filename)
(file-name-directory filename)))
- ;; Filename-spec is objA; at this point it is represented as
- ;; (file1 . file2). We get it using ediff-get-session-objA
- ;; directory part of the first file in the patch
- (base-dir1 (file-name-directory
- (car (ediff-get-session-objA-name (car ediff-patch-map)))))
- ;; directory part of the 2nd file in the patch
- (base-dir2 (file-name-directory
- (cdr (ediff-get-session-objA-name (car ediff-patch-map)))))
+ ;; In case 2 files are possible patch targets, the user will be offered
+ ;; to choose file1 or file2. In a multifile patch, if the user chooses
+ ;; 1 or 2, this choice is preserved to decide future alternatives.
+ chosen-alternative
)
;; chop off base-dirs
(mapcar (lambda (session-info)
- (let ((proposed-file-names
- (ediff-get-session-objA-name session-info)))
+ (let* ((proposed-file-names
+ ;; Filename-spec is objA; it is represented as
+ ;; (file1 . file2). Get it using ediff-get-session-objA.
+ (ediff-get-session-objA-name session-info))
+ ;; base-dir1 is the dir part of the 1st file in the patch
+ (base-dir1
+ (or (file-name-directory (car proposed-file-names))
+ ""))
+ ;; directory part of the 2nd file in the patch
+ (base-dir2
+ (or (file-name-directory (cdr proposed-file-names))
+ ""))
+ )
+ ;; If both base-dir1 and base-dir2 are relative and exist,
+ ;; assume that
+ ;; these dirs lead to the actual files starting at the present
+ ;; directory. So, we don't strip these relative dirs from the
+ ;; file names. This is a heuristic intended to improve guessing
+ (unless (or (file-name-absolute-p base-dir1)
+ (file-name-absolute-p base-dir2)
+ (not (file-exists-p base-dir1))
+ (not (file-exists-p base-dir2)))
+ (setq base-dir1 ""
+ base-dir2 ""))
(or (string= (car proposed-file-names) "/dev/null")
(setcar proposed-file-names
(ediff-file-name-sans-prefix
(car proposed-file-names) base-dir1)))
- (or (string=
- (cdr proposed-file-names) "/dev/null")
- (setcdr proposed-file-names
- (ediff-file-name-sans-prefix
- (cdr proposed-file-names) base-dir2)))
- ))
+ (or (string=
+ (cdr proposed-file-names) "/dev/null")
+ (setcdr proposed-file-names
+ (ediff-file-name-sans-prefix
+ (cdr proposed-file-names) base-dir2)))
+ ))
ediff-patch-map)
;; take the given file name into account
(ediff-get-session-objA-name session-info)))
(if (and (string-match "^/null/" (car proposed-file-names))
(string-match "^/null/" (cdr proposed-file-names)))
- ;; couldn't strip base-dir1 and base-dir2
- ;; hence, something is wrong
+ ;; couldn't intuit the file name to patch, so
+ ;; something is amiss
(progn
(with-output-to-temp-buffer ediff-msg-buffer
(ediff-with-current-buffer standard-output
(concat actual-dir (cdr proposed-file-names)))))
))
ediff-patch-map)
- ;; check for the shorter existing file in each pair and discard the other
- ;; one
+ ;; Check for the existing files in each pair and discard the nonexisting
+ ;; ones. If both exist, ask the user.
(mapcar (lambda (session-info)
(let* ((file1 (car (ediff-get-session-objA-name session-info)))
(file2 (cdr (ediff-get-session-objA-name session-info)))
(f1-exists (file-exists-p file1))
(f2-exists (file-exists-p file2)))
(cond
- ((and (< (length file2) (length file1))
- f2-exists)
+ ((and
+ ;; The patch program prefers the shortest file as the patch
+ ;; target. However, this is a questionable heuristic. In an
+ ;; interactive program, like ediff, we can offer the user a
+ ;; choice.
+ ;; (< (length file2) (length file1))
+ (not f1-exists)
+ f2-exists)
;; replace file-pair with the winning file2
(setcar session-file-object file2))
- ((and (< (length file1) (length file2))
- f1-exists)
+ ((and
+ ;; (< (length file1) (length file2))
+ (not f2-exists)
+ f1-exists)
;; replace file-pair with the winning file1
(setcar session-file-object file1))
((and f1-exists f2-exists
(string= file1 file2))
(setcar session-file-object file1))
+ ((and f1-exists f2-exists (eq chosen-alternative 1))
+ (setcar session-file-object file1))
+ ((and f1-exists f2-exists (eq chosen-alternative 2))
+ (setcar session-file-object file2))
((and f1-exists f2-exists)
(with-output-to-temp-buffer ediff-msg-buffer
(ediff-with-current-buffer standard-output
Type `y' to use %s as the target;
Type `n' to use %s as the target.
"
- file1 file2 file2 file1)))
+ file1 file2 file1 file2)))
(setcar session-file-object
- (if (y-or-n-p (format "Use %s ? " file2))
- file2 file1)))
+ (if (y-or-n-p (format "Use %s ? " file1))
+ (progn
+ (setq chosen-alternative 1)
+ file1)
+ (setq chosen-alternative 2)
+ file2))
+ )
(f2-exists (setcar session-file-object file2))
(f1-exists (setcar session-file-object file1))
(t
(if (string= file1 file2)
(princ (format "
%s
-is the target for this patch. However, this file does not exist."
+is assumed to be the target for this patch. However, this file does not exist."
file1))
(princ (format "
%s
;; prompt for file, get the buffer
(defun ediff-prompt-for-patch-file ()
- (let ((dir (cond (ediff-patch-default-directory) ; try patch default dir
- (ediff-use-last-dir ediff-last-dir-patch)
+ (let ((dir (cond (ediff-use-last-dir ediff-last-dir-patch)
+ (ediff-patch-default-directory) ; try patch default dir
(t default-directory)))
- (coding-system-for-read ediff-coding-system-for-read))
- (find-file-noselect
- (read-file-name
- (format "Patch is in file:%s "
- (cond ((and buffer-file-name
- (equal (expand-file-name dir)
- (file-name-directory buffer-file-name)))
- (concat
- " (default "
- (file-name-nondirectory buffer-file-name)
- ")"))
- (t "")))
- dir buffer-file-name 'must-match))
+ (coding-system-for-read ediff-coding-system-for-read)
+ patch-file-name)
+ (setq patch-file-name
+ (read-file-name
+ (format "Patch is in file%s: "
+ (cond ((and buffer-file-name
+ (equal (expand-file-name dir)
+ (file-name-directory buffer-file-name)))
+ (concat
+ " (default "
+ (file-name-nondirectory buffer-file-name)
+ ")"))
+ (t "")))
+ dir buffer-file-name 'must-match))
+ (if (file-directory-p patch-file-name)
+ (error "Patch file cannot be a directory: %s" patch-file-name)
+ (find-file-noselect patch-file-name))
))
(ediff-maybe-checkout buf-to-patch)
(ediff-with-current-buffer patch-diagnostics
- (insert-buffer patch-buf)
+ (insert-buffer-substring patch-buf)
(message "Applying patch ... ")
;; fix environment for gnu patch, so it won't make numbered extensions
(setq backup-style (getenv "VERSION_CONTROL"))
+(provide 'ediff-ptch)
+
;;; Local Variables:
;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun)