(eval-when-compile (require 'cl))
(defgroup diff-mode ()
"Major mode for viewing/editing diffs"
:version "21.1"
:group 'tools
:group 'diff)
(defcustom diff-default-read-only t
"If non-nil, `diff-mode' buffers default to being read-only."
:type 'boolean
:group 'diff-mode)
(defcustom diff-jump-to-old-file nil
"*Non-nil means `diff-goto-source' jumps to the old file.
Else, it jumps to the new file."
:group 'diff-mode
:type '(boolean))
(defcustom diff-update-on-the-fly t
"*Non-nil means hunk headers are kept up-to-date on-the-fly.
When editing a diff file, the line numbers in the hunk headers
need to be kept consistent with the actual diff. This can
either be done on the fly (but this sometimes interacts poorly with the
undo mechanism) or whenever the file is written (can be slow
when editing big diffs)."
:group 'diff-mode
:type '(boolean))
(defcustom diff-advance-after-apply-hunk t
"*Non-nil means `diff-apply-hunk' will move to the next hunk after applying."
:group 'diff-mode
:type 'boolean)
(defvar diff-mode-hook nil
"Run after setting up the `diff-mode' major mode.")
(defvar diff-outline-regexp
"\\([*+][*+][*+] [^0-9]\\|@@ ...\\|\\*\\*\\* [0-9].\\|--- [0-9]..\\)")
(easy-mmode-defmap diff-mode-shared-map
'( ("n" . diff-hunk-next)
("N" . diff-file-next)
("p" . diff-hunk-prev)
("P" . diff-file-prev)
("k" . diff-hunk-kill)
("K" . diff-file-kill)
("}" . diff-file-next)
("{" . diff-file-prev)
("\C-m" . diff-goto-source)
([mouse-2] . diff-mouse-goto-source)
("W" . widen)
("o" . diff-goto-source) (" " . scroll-up)
("\177" . scroll-down)
("A" . diff-ediff-patch)
("r" . diff-restrict-view)
("R" . diff-reverse-direction)
("U" . diff-context->unified)
("C" . diff-unified->context))
"Basic keymap for `diff-mode', bound to various prefix keys.")
(easy-mmode-defmap diff-mode-map
`(("\e" . ,diff-mode-shared-map)
("\C-c\C-c" . diff-goto-source)
("\C-c\C-s" . diff-split-hunk)
("\C-c\C-a" . diff-apply-hunk)
("\C-c\C-t" . diff-test-hunk))
"Keymap for `diff-mode'. See also `diff-mode-shared-map'.")
(easy-menu-define diff-mode-menu diff-mode-map
"Menu for `diff-mode'."
'("Diff"
["Jump to Source" diff-goto-source t]
["Apply hunk" diff-apply-hunk t]
["Apply diff with Ediff" diff-ediff-patch t]
["-----" nil nil]
["Reverse direction" diff-reverse-direction t]
["Context -> Unified" diff-context->unified t]
["Unified -> Context" diff-unified->context t]
))
(defcustom diff-minor-mode-prefix "\C-c="
"Prefix key for `diff-minor-mode' commands."
:group 'diff-mode
:type '(choice (string "\e") (string "C-c=") string))
(easy-mmode-defmap diff-minor-mode-map
`((,diff-minor-mode-prefix . ,diff-mode-shared-map))
"Keymap for `diff-minor-mode'. See also `diff-mode-shared-map'.")
(defface diff-header-face
'((((type tty pc) (class color) (background light))
(:foreground "blue1" :bold t))
(((type tty pc) (class color) (background dark))
(:foreground "green" :bold t))
(((class color) (background light))
(:background "grey85"))
(((class color) (background dark))
(:background "grey45"))
(t (:bold t)))
"`diff-mode' face inherited by hunk and index header faces."
:group 'diff-mode)
(defvar diff-header-face 'diff-header-face)
(defface diff-file-header-face
'((((type tty pc) (class color) (background light))
(:foreground "yellow" :bold t))
(((type tty pc) (class color) (background dark))
(:foreground "cyan" :bold t))
(((class color) (background light))
(:background "grey70" :bold t))
(((class color) (background dark))
(:background "grey60" :bold t))
(t (:bold t))) "`diff-mode' face used to highlight file header lines."
:group 'diff-mode)
(defvar diff-file-header-face 'diff-file-header-face)
(defface diff-index-face
'((t (:inherit diff-file-header-face)))
"`diff-mode' face used to highlight index header lines."
:group 'diff-mode)
(defvar diff-index-face 'diff-index-face)
(defface diff-hunk-header-face
'((t (:inherit diff-header-face)))
"`diff-mode' face used to highlight hunk header lines."
:group 'diff-mode)
(defvar diff-hunk-header-face 'diff-hunk-header-face)
(defface diff-removed-face
'((t (:inherit diff-changed-face)))
"`diff-mode' face used to highlight removed lines."
:group 'diff-mode)
(defvar diff-removed-face 'diff-removed-face)
(defface diff-added-face
'((t (:inherit diff-changed-face)))
"`diff-mode' face used to highlight added lines."
:group 'diff-mode)
(defvar diff-added-face 'diff-added-face)
(defface diff-changed-face
'((((type tty pc) (class color) (background light))
(:foreground "magenta" :bold t :italic t))
(((type tty pc) (class color) (background dark))
(:foreground "yellow" :bold t :italic t))
(t ()))
"`diff-mode' face used to highlight changed lines."
:group 'diff-mode)
(defvar diff-changed-face 'diff-changed-face)
(defface diff-function-face
'((t (:inherit diff-context-face)))
"`diff-mode' face used to highlight function names produced by \"diff -p\"."
:group 'diff-mode)
(defvar diff-function-face 'diff-function-face)
(defface diff-context-face
'((((class color) (background light))
(:foreground "grey50"))
(((class color) (background dark))
(:foreground "grey70"))
(t ))
"`diff-mode' face used to highlight context and other side-information."
:group 'diff-mode)
(defvar diff-context-face 'diff-context-face)
(defface diff-nonexistent-face
'((t (:inherit diff-file-header-face)))
"`diff-mode' face used to highlight nonexistent files in recursive diffs."
:group 'diff-mode)
(defvar diff-nonexistent-face 'diff-nonexistent-face)
(defvar diff-font-lock-keywords
'(("^\\(@@ -[0-9,]+ \\+[0-9,]+ @@\\)\\(.*\\)$" (1 diff-hunk-header-face)
(2 diff-function-face))
("^--- .+ ----$" . diff-hunk-header-face) ("^\\(\\*\\{15\\}\\)\\(.*\\)$" (1 diff-hunk-header-face)
(2 diff-function-face))
("^\\*\\*\\* .+ \\*\\*\\*\\*". diff-hunk-header-face) ("^\\(---\\|\\+\\+\\+\\|\\*\\*\\*\\) \\(\\S-+\\)\\(.*[^*-]\\)?\n"
(0 diff-header-face) (2 diff-file-header-face prepend))
("^[0-9,]+[acd][0-9,]+$" . diff-hunk-header-face)
("^!.*\n" . diff-changed-face) ("^[+>].*\n" . diff-added-face)
("^[-<].*\n" . diff-removed-face)
("^Index: \\(.+\\).*\n" (0 diff-header-face) (1 diff-index-face prepend))
("^Only in .*\n" . diff-nonexistent-face)
("^#.*" . font-lock-string-face)
("^[^-=+*!<>].*\n" . diff-context-face)))
(defconst diff-font-lock-defaults
'(diff-font-lock-keywords t nil nil nil (font-lock-multiline . nil)))
(defvar diff-imenu-generic-expression
'((nil "\\+\\+\\+\\ \\([^\t\n]+\\)[\t\n]" 1) (nil "^--- \\([^\t\n]+\\)\t.*\n\\*" 1)))
(defvar diff-file-regexp-alist
'(("Index: \\(.+\\)" 1)))
(defvar diff-error-regexp-alist
'(("@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@" nil 2)
("--- \\([0-9]+\\),[0-9]+ ----" nil 1)
("\\([0-9]+\\)\\(,[0-9]+\\)?[adc]\\([0-9]+\\)" nil 3)))
(defconst diff-hunk-header-re "^\\(@@ -[0-9,]+ \\+[0-9,]+ @@.*\\|\\*\\{15\\}.*\n\\*\\*\\* .+ \\*\\*\\*\\*\\|[0-9]+\\(,[0-9]+\\)?[acd][0-9]+\\(,[0-9]+\\)?\\)$")
(defconst diff-file-header-re (concat "^\\(--- .+\n\\+\\+\\+\\|\\*\\*\\* .+\n---\\|[^-+!<>0-9@* ]\\).+\n" (substring diff-hunk-header-re 1)))
(defvar diff-narrowed-to nil)
(defun diff-end-of-hunk (&optional style)
(if (looking-at diff-hunk-header-re) (goto-char (match-end 0)))
(let ((end (and (re-search-forward (case style
(unified (concat "^[^-+# \\]\\|"
diff-file-header-re))
(context "^[^-+#! \\]")
(normal "^[^<>#\\]")
(t "^[^-+#!<> \\]"))
nil t)
(match-beginning 0))))
(goto-char (or end (point-max)))))
(defun diff-beginning-of-hunk ()
(beginning-of-line)
(unless (looking-at diff-hunk-header-re)
(forward-line 1)
(condition-case ()
(re-search-backward diff-hunk-header-re)
(error (error "Can't find the beginning of the hunk")))))
(defun diff-beginning-of-file ()
(beginning-of-line)
(unless (looking-at diff-file-header-re)
(forward-line 2)
(condition-case ()
(re-search-backward diff-file-header-re)
(error (error "Can't find the beginning of the file")))))
(defun diff-end-of-file ()
(re-search-forward "^[-+#!<>0-9@* \\]" nil t)
(re-search-forward "^[^-+#!<>0-9@* \\]" nil 'move)
(beginning-of-line))
(easy-mmode-define-navigation
diff-hunk diff-hunk-header-re "hunk" diff-end-of-hunk)
(easy-mmode-define-navigation
diff-file diff-file-header-re "file" diff-end-of-hunk)
(defun diff-restrict-view (&optional arg)
"Restrict the view to the current hunk.
If the prefix ARG is given, restrict the view to the current file instead."
(interactive "P")
(save-excursion
(if arg (diff-beginning-of-file) (diff-beginning-of-hunk))
(narrow-to-region (point)
(progn (if arg (diff-end-of-file) (diff-end-of-hunk))
(point)))
(set (make-local-variable 'diff-narrowed-to) (if arg 'file 'hunk))))
(defun diff-hunk-kill ()
"Kill current hunk."
(interactive)
(diff-beginning-of-hunk)
(let ((start (point))
(firsthunk (save-excursion
(ignore-errors
(diff-beginning-of-file) (diff-hunk-next) (point))))
(nexthunk (save-excursion
(ignore-errors
(diff-hunk-next) (point))))
(nextfile (save-excursion
(ignore-errors
(diff-file-next) (point)))))
(if (and firsthunk (= firsthunk start)
(or (null nexthunk)
(and nextfile (> nexthunk nextfile))))
(diff-file-kill)
(diff-end-of-hunk)
(kill-region start (point)))))
(defun diff-file-kill ()
"Kill current file's hunks."
(interactive)
(diff-beginning-of-file)
(let* ((start (point))
(prevhunk (save-excursion
(ignore-errors
(diff-hunk-prev) (point))))
(index (save-excursion
(re-search-backward "^Index: " prevhunk t))))
(when index (setq start index))
(diff-end-of-file)
(kill-region start (point))))
(defun diff-kill-junk ()
"Kill spurious empty diffs."
(interactive)
(save-excursion
(let ((inhibit-read-only t))
(goto-char (point-min))
(while (re-search-forward (concat "^\\(Index: .*\n\\)"
"\\([^-+!* <>].*\n\\)*?"
"\\(\\(Index:\\) \\|"
diff-file-header-re "\\)")
nil t)
(delete-region (if (match-end 4) (match-beginning 0) (match-end 1))
(match-beginning 3))
(beginning-of-line)))))
(defun diff-count-matches (re start end)
(save-excursion
(let ((n 0))
(goto-char start)
(while (re-search-forward re end t) (incf n))
n)))
(defun diff-split-hunk ()
"Split the current (unified diff) hunk at point into two hunks."
(interactive)
(beginning-of-line)
(let ((pos (point))
(start (progn (diff-beginning-of-hunk) (point))))
(unless (looking-at "@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@")
(error "diff-split-hunk only works on unified context diffs"))
(forward-line 1)
(let* ((start1 (string-to-number (match-string 1)))
(start2 (string-to-number (match-string 2)))
(newstart1 (+ start1 (diff-count-matches "^[- \t]" (point) pos)))
(newstart2 (+ start2 (diff-count-matches "^[+ \t]" (point) pos))))
(goto-char pos)
(insert "@@ -" (number-to-string newstart1) ",1 +"
(number-to-string newstart2) ",1 @@\n")
(diff-fixup-modifs start pos))))
(defvar diff-remembered-files-alist nil)
(defun diff-filename-drop-dir (file)
(when (string-match "/" file) (substring file (match-end 0))))
(defun diff-merge-strings (ancestor from to)
"Merge the diff between ANCESTOR and FROM into TO.
Returns the merged string if successful or nil otherwise.
The strings are assumed not to contain any \"\\n\" (i.e. end of line).
If ANCESTOR = FROM, returns TO.
If ANCESTOR = TO, returns FROM.
The heuristic is simplistic and only really works for cases
like \(diff-merge-strings \"b/foo\" \"b/bar\" \"/a/c/foo\")."
(let ((str (concat ancestor "\n" from "\n" to)))
(when (and (string-match (concat
"\\`\\(.*?\\)\\(.*\\)\\(.*\\)\n"
"\\1\\(.*\\)\\3\n"
"\\(.*\\(\\2\\).*\\)\\'") str)
(equal to (match-string 5 str)))
(concat (substring str (match-beginning 5) (match-beginning 6))
(match-string 4 str)
(substring str (match-end 6) (match-end 5))))))
(defun diff-find-file-name (&optional old)
"Return the file corresponding to the current patch.
Non-nil OLD means that we want the old file."
(save-excursion
(unless (looking-at diff-file-header-re)
(or (ignore-errors (diff-beginning-of-file))
(re-search-forward diff-file-header-re nil t)))
(let* ((limit (save-excursion
(condition-case ()
(progn (diff-hunk-prev) (point))
(error (point-min)))))
(header-files
(if (looking-at "[-*][-*][-*] \\(\\S-+\\)\\(\\s-.*\\)?\n[-+][-+][-+] \\(\\S-+\\)")
(list (if old (match-string 1) (match-string 3))
(if old (match-string 3) (match-string 1)))
(forward-line 1) nil))
(fs (append
(when (save-excursion
(re-search-backward "^Index: \\(.+\\)" limit t))
(list (match-string 1)))
header-files
(when (re-search-backward "^diff \\(-\\S-+ +\\)*\\(\\S-+\\)\\( +\\(\\S-+\\)\\)?" nil t)
(list (if old (match-string 2) (match-string 4))
(if old (match-string 4) (match-string 2))))))
(fs (delq nil fs)))
(or
(cdr (assoc fs diff-remembered-files-alist))
(dolist (rf diff-remembered-files-alist)
(let ((newfile (diff-merge-strings (caar rf) (car fs) (cdr rf))))
(if (and newfile (file-exists-p newfile)) (return newfile))))
(do* ((files fs (delq nil (mapcar 'diff-filename-drop-dir files)))
(file nil nil))
((or (null files)
(setq file (do* ((files files (cdr files))
(file (car files) (car files)))
((or (null file) (file-exists-p file))
file))))
file))
(and (string-match "\\.rej\\'" (or buffer-file-name ""))
(let ((file (substring buffer-file-name 0 (match-beginning 0))))
(when (file-exists-p file) file)))
(let ((file (read-file-name (format "Use file %s: " (or (first fs) ""))
nil (first fs) t (first fs))))
(set (make-local-variable 'diff-remembered-files-alist)
(cons (cons fs file) diff-remembered-files-alist))
file)))))
(defun diff-mouse-goto-source (event)
"Run `diff-goto-source' for the diff at a mouse click."
(interactive "e")
(save-excursion
(mouse-set-point event)
(diff-goto-source)))
(defun diff-ediff-patch ()
"Call `ediff-patch-file' on the current buffer."
(interactive)
(condition-case err
(ediff-patch-file nil (current-buffer))
(wrong-number-of-arguments (ediff-patch-file))))
(defun diff-unified->context (start end)
"Convert unified diffs to context diffs.
START and END are either taken from the region (if a prefix arg is given) or
else cover the whole bufer."
(interactive (if current-prefix-arg
(list (mark) (point))
(list (point-min) (point-max))))
(unless (markerp end) (setq end (copy-marker end)))
(let ( (inhibit-read-only t))
(save-excursion
(goto-char start)
(while (and (re-search-forward "^\\(\\(---\\) .+\n\\(\\+\\+\\+\\) .+\\|@@ -\\([0-9]+\\),\\([0-9]+\\) \\+\\([0-9]+\\),\\([0-9]+\\) @@.*\\)$" nil t)
(< (point) end))
(combine-after-change-calls
(if (match-beginning 2)
(progn
(replace-match "---" t t nil 3)
(replace-match "***" t t nil 2))
(let ((line1 (match-string 4))
(lines1 (match-string 5))
(line2 (match-string 6))
(lines2 (match-string 7)))
(replace-match
(concat "***************\n*** " line1 ","
(number-to-string (+ (string-to-number line1)
(string-to-number lines1)
-1)) " ****"))
(forward-line 1)
(save-restriction
(narrow-to-region (point)
(progn (diff-end-of-hunk 'unified) (point)))
(let ((hunk (buffer-string)))
(goto-char (point-min))
(if (not (save-excursion (re-search-forward "^-" nil t)))
(delete-region (point) (point-max))
(goto-char (point-max))
(let ((modif nil) last-pt)
(while (progn (setq last-pt (point))
(= (forward-line -1) 0))
(case (char-after)
(? (insert " ") (setq modif nil) (backward-char 1))
(?+ (delete-region (point) last-pt) (setq modif t))
(?- (if (not modif)
(progn (forward-char 1)
(insert " "))
(delete-char 1)
(insert "! "))
(backward-char 2))
(?\\ (when (save-excursion (forward-line -1)
(= (char-after) ?+))
(delete-region (point) last-pt) (setq modif t)))
(t (setq modif nil))))))
(goto-char (point-max))
(save-excursion
(insert "--- " line2 ","
(number-to-string (+ (string-to-number line2)
(string-to-number lines2)
-1)) " ----\n" hunk))
(forward-line 1)
(if (not (save-excursion (re-search-forward "^+" nil t)))
(delete-region (point) (point-max))
(let ((modif nil) (delete nil))
(while (not (eobp))
(case (char-after)
(? (insert " ") (setq modif nil) (backward-char 1))
(?- (setq delete t) (setq modif t))
(?+ (if (not modif)
(progn (forward-char 1)
(insert " "))
(delete-char 1)
(insert "! "))
(backward-char 2))
(?\\ (when (save-excursion (forward-line 1)
(not (eobp)))
(setq delete t) (setq modif t)))
(t (setq modif nil)))
(let ((last-pt (point)))
(forward-line 1)
(when delete
(delete-region last-pt (point))
(setq delete nil)))))))))))))))
(defun diff-context->unified (start end)
"Convert context diffs to unified diffs.
START and END are either taken from the region (if a prefix arg is given) or
else cover the whole bufer."
(interactive (if current-prefix-arg
(list (mark) (point))
(list (point-min) (point-max))))
(unless (markerp end) (setq end (copy-marker end)))
(let ( (inhibit-read-only t))
(save-excursion
(goto-char start)
(while (and (re-search-forward "^\\(\\(\\*\\*\\*\\) .+\n\\(---\\) .+\\|\\*\\{15\\}.*\n\\*\\*\\* \\([0-9]+\\),\\(-?[0-9]+\\) \\*\\*\\*\\*\\)$" nil t)
(< (point) end))
(combine-after-change-calls
(if (match-beginning 2)
(progn
(replace-match "+++" t t nil 3)
(replace-match "---" t t nil 2))
(let ((line1s (match-string 4))
(line1e (match-string 5))
(pt1 (match-beginning 0)))
(replace-match "")
(unless (re-search-forward
"^--- \\([0-9]+\\),\\(-?[0-9]+\\) ----$" nil t)
(error "Can't find matching `--- n1,n2 ----' line"))
(let ((line2s (match-string 1))
(line2e (match-string 2))
(pt2 (progn
(delete-region (progn (beginning-of-line) (point))
(progn (forward-line 1) (point)))
(point-marker))))
(goto-char pt1)
(forward-line 1)
(while (< (point) pt2)
(case (char-after)
((?! ?-) (delete-char 2) (insert "-") (forward-line 1))
(?\ (let* ((endline2
(save-excursion
(goto-char pt2) (forward-line 1) (point)))
(c (char-after pt2)))
(case c
((?! ?+)
(insert "+"
(prog1 (buffer-substring (+ pt2 2) endline2)
(delete-region pt2 endline2))))
(?\ (delete-region pt2 endline2)
(delete-char 1)
(forward-line 1))
(?\\ (forward-line 1))
(t (delete-char 1) (forward-line 1)))))
(t (forward-line 1))))
(while (looking-at "[+! ] ")
(if (/= (char-after) ?!) (forward-char 1)
(delete-char 1) (insert "+"))
(delete-char 1) (forward-line 1))
(save-excursion
(goto-char pt1)
(insert "@@ -" line1s ","
(number-to-string (- (string-to-number line1e)
(string-to-number line1s)
-1))
" +" line2s ","
(number-to-string (- (string-to-number line2e)
(string-to-number line2s)
-1)) " @@"))))))))))
(defun diff-reverse-direction (start end)
"Reverse the direction of the diffs.
START and END are either taken from the region (if a prefix arg is given) or
else cover the whole bufer."
(interactive (if current-prefix-arg
(list (mark) (point))
(list (point-min) (point-max))))
(unless (markerp end) (setq end (copy-marker end)))
(let ( (inhibit-read-only t))
(save-excursion
(goto-char start)
(while (and (re-search-forward "^\\(\\([-*][-*][-*] \\)\\(.+\\)\n\\([-+][-+][-+] \\)\\(.+\\)\\|\\*\\{15\\}.*\n\\*\\*\\* \\(.+\\) \\*\\*\\*\\*\\|@@ -\\([0-9,]+\\) \\+\\([0-9,]+\\) @@.*\\)$" nil t)
(< (point) end))
(combine-after-change-calls
(cond
((match-beginning 2) (replace-match "\\2\\5\n\\4\\3" nil))
((match-beginning 6)
(let ((pt-lines1 (match-beginning 6))
(lines1 (match-string 6)))
(replace-match "" nil nil nil 6)
(forward-line 1)
(let ((half1s (point)))
(while (looking-at "[-! \\][ \t]\\|#")
(when (= (char-after) ?-) (delete-char 1) (insert "+"))
(forward-line 1))
(let ((half1 (delete-and-extract-region half1s (point))))
(unless (looking-at "^--- \\([0-9]+,-?[0-9]+\\) ----$")
(insert half1)
(error "Can't find matching `--- n1,n2 ----' line"))
(let ((str1 (match-string 1)))
(replace-match lines1 nil nil nil 1)
(forward-line 1)
(let ((half2s (point)))
(while (looking-at "[!+ \\][ \t]\\|#")
(when (= (char-after) ?+) (delete-char 1) (insert "-"))
(forward-line 1))
(let ((half2 (delete-and-extract-region half2s (point))))
(insert (or half1 ""))
(goto-char half1s)
(insert (or half2 ""))))
(goto-char pt-lines1)
(insert str1))))))
((match-beginning 7)
(replace-match "@@ -\\8 +\\7 @@" nil)
(forward-line 1)
(let ((c (char-after)) first last)
(while (case (setq c (char-after))
(?- (setq first (or first (point)))
(delete-char 1) (insert "+") t)
(?+ (setq last (or last (point)))
(delete-char 1) (insert "-") t)
((?\\ ?#) t)
(t (when (and first last (< first last))
(let ((str
(save-excursion
(delete-and-extract-region first last))))
(insert str)))
(setq first nil last nil)
(equal ?\ c)))
(forward-line 1))))))))))
(defun diff-fixup-modifs (start end)
"Fixup the hunk headers (in case the buffer was modified).
START and END are either taken from the region (if a prefix arg is given) or
else cover the whole bufer."
(interactive (if current-prefix-arg
(list (mark) (point))
(list (point-min) (point-max))))
(let ((inhibit-read-only t))
(save-excursion
(goto-char end) (diff-end-of-hunk)
(let ((plus 0) (minus 0) (space 0) (bang 0))
(while (and (= (forward-line -1) 0) (<= start (point)))
(if (not (looking-at "\\(@@ -[0-9,]+ \\+[0-9,]+ @@.*\\|[-*][-*][-*] .+ [-*][-*][-*][-*]\\)$"))
(case (char-after)
(?\ (incf space))
(?+ (incf plus))
(?- (incf minus))
(?! (incf bang))
((?\\ ?#) nil)
(t (setq space 0 plus 0 minus 0 bang 0)))
(cond
((looking-at "@@ -[0-9]+,\\([0-9]*\\) \\+[0-9]+,\\([0-9]*\\) @@.*$")
(let* ((old1 (match-string 1))
(old2 (match-string 2))
(new1 (number-to-string (+ space minus)))
(new2 (number-to-string (+ space plus))))
(unless (string= new2 old2) (replace-match new2 t t nil 2))
(unless (string= new1 old1) (replace-match new1 t t nil 1))))
((looking-at "--- \\([0-9]+\\),\\([0-9]*\\) ----$")
(when (> (+ space bang plus) 0)
(let* ((old1 (match-string 1))
(old2 (match-string 2))
(new (number-to-string
(+ space bang plus -1 (string-to-number old1)))))
(unless (string= new old2) (replace-match new t t nil 2)))))
((looking-at "\\*\\*\\* \\([0-9]+\\),\\(-?[0-9]*\\) \\*\\*\\*\\*$")
(when (> (+ space bang minus) 0)
(let* ((old (match-string 1))
(new (format
(concat "%0" (number-to-string (length old)) "d")
(+ space bang minus -1 (string-to-number old)))))
(unless (string= new old) (replace-match new t t nil 2))))))
(setq space 0 plus 0 minus 0 bang 0)))))))
(defun diff-write-contents-hooks ()
"Fixup hunk headers if necessary."
(if (buffer-modified-p) (diff-fixup-modifs (point-min) (point-max)))
nil)
(defvar diff-unhandled-changes nil)
(defun diff-after-change-function (beg end len)
"Remember to fixup the hunk header.
See `after-change-functions' for the meaning of BEG, END and LEN."
(when (and (not undo-in-progress) (not inhibit-read-only))
(if diff-unhandled-changes
(setq diff-unhandled-changes
(cons (min beg (car diff-unhandled-changes))
(max beg (cdr diff-unhandled-changes))))
(setq diff-unhandled-changes (cons beg end)))))
(defun diff-post-command-hook ()
"Fixup hunk headers if necessary."
(when (consp diff-unhandled-changes)
(ignore-errors
(save-excursion
(goto-char (car diff-unhandled-changes))
(unless (ignore-errors
(diff-beginning-of-hunk)
(save-excursion
(diff-end-of-hunk)
(> (point) (car diff-unhandled-changes))))
(goto-char (car diff-unhandled-changes))
(re-search-forward diff-hunk-header-re (cdr diff-unhandled-changes))
(diff-beginning-of-hunk))
(diff-fixup-modifs (point) (cdr diff-unhandled-changes))))
(setq diff-unhandled-changes nil)))
(define-derived-mode diff-mode fundamental-mode "Diff"
"Major mode for viewing/editing context diffs.
Supports unified and context diffs as well as (to a lesser extent)
normal diffs.
When the buffer is read-only, the ESC prefix is not necessary."
(set (make-local-variable 'font-lock-defaults) diff-font-lock-defaults)
(set (make-local-variable 'outline-regexp) diff-outline-regexp)
(set (make-local-variable 'imenu-generic-expression)
diff-imenu-generic-expression)
(when (and (> (point-max) (point-min)) diff-default-read-only)
(toggle-read-only t))
(if (not diff-update-on-the-fly)
(add-hook 'write-contents-hooks 'diff-write-contents-hooks)
(make-local-variable 'diff-unhandled-changes)
(add-hook 'after-change-functions 'diff-after-change-function nil t)
(add-hook 'post-command-hook 'diff-post-command-hook nil t))
(add-to-list (make-local-variable 'minor-mode-overriding-map-alist)
(cons 'buffer-read-only diff-mode-shared-map))
(set (make-local-variable 'add-log-current-defun-function)
'diff-current-defun)
(set (make-local-variable 'add-log-buffer-file-name-function)
'diff-find-file-name))
(define-minor-mode diff-minor-mode
"Minor mode for viewing/editing context diffs.
\\{diff-minor-mode-map}"
nil " Diff" nil
(if (not diff-update-on-the-fly)
(add-hook 'write-contents-hooks 'diff-write-contents-hooks)
(make-local-variable 'diff-unhandled-changes)
(add-hook 'after-change-functions 'diff-after-change-function nil t)
(add-hook 'post-command-hook 'diff-post-command-hook nil t)))
(defun diff-next-complex-hunk ()
"Jump to the next \"complex\" hunk.
\"Complex\" is approximated by \"the hunk changes the number of lines\".
Only works for unified diffs."
(interactive)
(while
(and (re-search-forward "^@@ [-0-9]+,\\([0-9]+\\) [+0-9]+,\\([0-9]+\\) @@"
nil t)
(equal (match-string 1) (match-string 2)))))
(defun diff-hunk-text (hunk destp &optional char-offset)
"Return the literal source text from HUNK.
if DESTP is nil return the source, otherwise the destination text.
If CHAR-OFFSET is non-nil, it should be a char-offset in
HUNK, and instead of a string, a cons cell is returned whose car is the
appropriate text, and whose cdr is the corresponding char-offset in that text."
(with-temp-buffer
(insert hunk)
(goto-char (point-min))
(let ((src-pos nil)
(dst-pos nil)
(divider-pos nil)
(num-pfx-chars 2))
(cond ((looking-at "^@@")
(setq num-pfx-chars 1)
(forward-line 1)
(setq src-pos (point) dst-pos (point)))
((looking-at "^\\*\\*")
(forward-line 2)
(setq src-pos (point))
(re-search-forward "^--- " nil t)
(forward-line 0)
(setq divider-pos (point))
(forward-line 1)
(setq dst-pos (point)))
((looking-at "^[0-9]+a[0-9,]+$")
(forward-line 1)
(setq dst-pos (point)))
((looking-at "^[0-9,]+d[0-9]+$")
(forward-line 1)
(setq src-pos (point)))
((looking-at "^[0-9,]+c[0-9,]+$")
(forward-line 1)
(setq src-pos (point))
(re-search-forward "^---$" nil t)
(forward-line 0)
(setq divider-pos (point))
(forward-line 1)
(setq dst-pos (point)))
(t
(error "Unknown diff hunk type")))
(if (if destp (null dst-pos) (null src-pos))
(if char-offset '("" . 0) "")
(cond ((equal src-pos divider-pos) (setq src-pos dst-pos))
((equal dst-pos (point-max)) (setq dst-pos src-pos)))
(when char-offset (goto-char (+ (point-min) char-offset)))
(save-excursion
(let ((keep (if destp dst-pos src-pos)))
(when (and divider-pos (> divider-pos keep))
(delete-region divider-pos (point-max)))
(delete-region (point-min) keep))
(let ((kill-char (if destp ?- ?+)))
(goto-char (point-min))
(while (not (eobp))
(if (eq (char-after) kill-char)
(delete-region (point) (progn (forward-line 1) (point)))
(delete-char num-pfx-chars)
(forward-line 1)))))
(let ((text (buffer-substring-no-properties (point-min) (point-max))))
(if char-offset (cons text (- (point) (point-min))) text))))))
(defun diff-find-text (text)
"Return the buffer position of the nearest occurrence of TEXT.
If TEXT isn't found, nil is returned."
(let* ((orig (point))
(forw (and (search-forward text nil t)
(match-beginning 0)))
(back (and (goto-char (+ orig (length text)))
(search-backward text nil t)
(match-beginning 0))))
(if (and forw back)
(if (> (- forw orig) (- orig back)) back forw)
(or back forw))))
(defsubst diff-xor (a b) (if a (not b) b))
(defun diff-find-source-location (&optional other-file reverse)
"Find out (BUF LINE-OFFSET POS SRC DST SWITCHED)."
(save-excursion
(let* ((other (diff-xor other-file diff-jump-to-old-file))
(char-offset (- (point) (progn (diff-beginning-of-hunk) (point))))
(hunk (buffer-substring (point)
(save-excursion (diff-end-of-hunk) (point))))
(old (diff-hunk-text hunk reverse char-offset))
(new (diff-hunk-text hunk (not reverse) char-offset))
(line (if (not (looking-at "\\(?:\\*\\{15\\}.*\n\\)?[-@* ]*\\([0-9,]+\\)\\([ acd+]+\\([0-9,]+\\)\\)?"))
(error "Can't find the hunk header")
(if other (match-string 1)
(if (match-end 3) (match-string 3)
(unless (re-search-forward "^--- \\([0-9,]+\\)" nil t)
(error "Can't find the hunk separator"))
(match-string 1)))))
(file (or (diff-find-file-name other) (error "Can't find the file")))
(buf (find-file-noselect file)))
(when (> (prefix-numeric-value other-file) 8)
(setq diff-jump-to-old-file other))
(with-current-buffer buf
(goto-line (string-to-number line))
(let* ((orig-pos (point))
(pos (diff-find-text (car old)))
(switched nil))
(when (null pos)
(setq pos (diff-find-text (car new)) switched t))
(nconc
(list buf)
(if pos (list (count-lines orig-pos pos) pos) (list nil orig-pos))
(if switched (list new old t) (list old new))))))))
(defun diff-hunk-status-msg (line-offset reversed dry-run)
(let ((msg (if dry-run
(if reversed "already applied" "not yet applied")
(if reversed "undone" "applied"))))
(message (cond ((null line-offset) "Hunk text not found")
((= line-offset 0) "Hunk %s")
((= line-offset 1) "Hunk %s at offset %d line")
(t "Hunk %s at offset %d lines"))
msg line-offset)))
(defun diff-apply-hunk (&optional reverse)
"Apply the current hunk to the source file and go to the next.
By default, the new source file is patched, but if the variable
`diff-jump-to-old-file' is non-nil, then the old source file is
patched instead (some commands, such as `diff-goto-source' can change
the value of this variable when given an appropriate prefix argument).
With a prefix argument, REVERSE the hunk."
(interactive "P")
(destructuring-bind (buf line-offset pos old new &optional switched)
(diff-find-source-location nil reverse)
(cond
((null line-offset)
(error "Can't find the text to patch"))
((and switched
(not (save-window-excursion
(pop-to-buffer buf)
(goto-char (+ pos (cdr old)))
(y-or-n-p
(if reverse
"Hunk hasn't been applied yet; apply it now? "
"Hunk has already been applied; undo it? ")))))
(message "(Nothing done)"))
(t
(with-current-buffer buf
(goto-char pos)
(delete-char (length (car old)))
(insert (car new)))
(set-window-point (display-buffer buf) (+ pos (cdr new)))
(diff-hunk-status-msg line-offset (diff-xor switched reverse) nil)
(when diff-advance-after-apply-hunk
(diff-hunk-next))))))
(defun diff-test-hunk (&optional reverse)
"See whether it's possible to apply the current hunk.
With a prefix argument, try to REVERSE the hunk."
(interactive "P")
(destructuring-bind (buf line-offset pos src dst &optional switched)
(diff-find-source-location nil reverse)
(set-window-point (display-buffer buf) (+ pos (cdr src)))
(diff-hunk-status-msg line-offset (diff-xor reverse switched) t)))
(defun diff-goto-source (&optional other-file)
"Jump to the corresponding source line.
`diff-jump-to-old-file' (or its opposite if the OTHER-FILE prefix arg
is given) determines whether to jump to the old or the new file.
If the prefix arg is bigger than 8 (for example with \\[universal-argument] \\[universal-argument])
then `diff-jump-to-old-file' is also set, for the next invocations."
(interactive "P")
(let ((rev (not (save-excursion (beginning-of-line) (looking-at "[-<]")))))
(destructuring-bind (buf line-offset pos src dst &optional switched)
(diff-find-source-location other-file rev)
(pop-to-buffer buf)
(goto-char (+ pos (cdr src)))
(diff-hunk-status-msg line-offset (diff-xor rev switched) t))))
(defun diff-current-defun ()
"Find the name of function at point.
For use in `add-log-current-defun-function'."
(destructuring-bind (buf line-offset pos src dst &optional switched)
(diff-find-source-location)
(save-excursion
(beginning-of-line)
(or (when (memq (char-after) '(?< ?-))
(let ((old (if switched dst src)))
(with-temp-buffer
(insert (car old))
(goto-char (cdr old))
(funcall (with-current-buffer buf major-mode))
(add-log-current-defun))))
(with-current-buffer buf
(goto-char (+ pos (cdr src)))
(add-log-current-defun))))))
(provide 'diff-mode)