1 ;;; git-blame.el --- Minor mode for incremental blame for Git -*- coding: utf-8 -*-
3 ;; Copyright (C) 2007 David Kågedal
5 ;; Authors: David Kågedal <davidk@lysator.liu.se>
6 ;; Created: 31 Jan 2007
7 ;; Message-ID: <87iren2vqx.fsf@morpheus.local>
9 ;; Keywords: git, version control, release management
11 ;; Compatibility: Emacs21
14 ;; This file is *NOT* part of GNU Emacs.
15 ;; This file is distributed under the same terms as GNU Emacs.
17 ;; This program is free software; you can redistribute it and/or
18 ;; modify it under the terms of the GNU General Public License as
19 ;; published by the Free Software Foundation; either version 2 of
20 ;; the License, or (at your option) any later version.
22 ;; This program is distributed in the hope that it will be
23 ;; useful, but WITHOUT ANY WARRANTY; without even the implied
24 ;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
25 ;; PURPOSE. See the GNU General Public License for more details.
27 ;; You should have received a copy of the GNU General Public
28 ;; License along with this program; if not, write to the Free
29 ;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
32 ;; http://www.fsf.org/copyleft/gpl.html
35 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
39 ;; Here is an Emacs implementation of incremental git-blame. When you
40 ;; turn it on while viewing a file, the editor buffer will be updated by
41 ;; setting the background of individual lines to a color that reflects
42 ;; which commit it comes from. And when you move around the buffer, a
43 ;; one-line summary will be shown in the echo area.
47 ;; To use this package, put it somewhere in `load-path' (or add
48 ;; directory with git-blame.el to `load-path'), and add the following
49 ;; line to your .emacs:
51 ;; (require 'git-blame)
53 ;; If you do not want to load this package before it is necessary, you
54 ;; can make use of the `autoload' feature, e.g. by adding to your .emacs
55 ;; the following lines
57 ;; (autoload 'git-blame-mode "git-blame"
58 ;; "Minor mode for incremental blame for Git." t)
60 ;; Then first use of `M-x git-blame-mode' would load the package.
64 ;; It requires GNU Emacs 21. If you'are using Emacs 20, try
67 ;; (overlay-put ovl 'face (list :background
68 ;; (cdr (assq 'color (cddddr info)))))
72 ;; (overlay-put ovl 'face (cons 'background-color
73 ;; (cdr (assq 'color (cddddr info)))))
76 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
80 (require 'cl) ; to use `push', `pop'
82 (defun color-scale (l)
91 (push (concat "#" (car r) (car g) (car b)) colors)
97 (defvar git-blame-dark-colors
98 (color-scale '("0c" "04" "24" "1c" "2c" "34" "14" "3c")))
100 (defvar git-blame-light-colors
101 (color-scale '("c4" "d4" "cc" "dc" "f4" "e4" "fc" "ec")))
103 (defvar git-blame-ancient-color "dark green")
105 (defvar git-blame-autoupdate t
106 "*Automatically update the blame display while editing")
108 (defvar git-blame-proc nil
109 "The running git-blame process")
110 (make-variable-buffer-local 'git-blame-proc)
112 (defvar git-blame-overlays nil
113 "The git-blame overlays used in the current buffer.")
114 (make-variable-buffer-local 'git-blame-overlays)
116 (defvar git-blame-cache nil
117 "A cache of git-blame information for the current buffer")
118 (make-variable-buffer-local 'git-blame-cache)
120 (defvar git-blame-idle-timer nil
121 "An idle timer that updates the blame")
122 (make-variable-buffer-local 'git-blame-cache)
124 (defvar git-blame-update-queue nil
125 "A queue of update requests")
126 (make-variable-buffer-local 'git-blame-update-queue)
128 (defvar git-blame-mode nil)
129 (make-variable-buffer-local 'git-blame-mode)
130 (unless (assq 'git-blame-mode minor-mode-alist)
131 (setq minor-mode-alist
132 (cons (list 'git-blame-mode " blame")
136 (defun git-blame-mode (&optional arg)
137 "Minor mode for displaying Git blame"
140 (setq git-blame-mode (eq arg 1))
141 (setq git-blame-mode (not git-blame-mode)))
142 (make-local-variable 'git-blame-colors)
143 (if git-blame-autoupdate
144 (add-hook 'after-change-functions 'git-blame-after-change nil t)
145 (remove-hook 'after-change-functions 'git-blame-after-change t))
149 (let ((bgmode (cdr (assoc 'background-mode (frame-parameters)))))
150 (if (eq bgmode 'dark)
151 (setq git-blame-colors git-blame-dark-colors)
152 (setq git-blame-colors git-blame-light-colors)))
153 (setq git-blame-cache (make-hash-table :test 'equal))
155 (cancel-timer git-blame-idle-timer)))
158 (defun git-reblame ()
159 "Recalculate all blame information in the current buffer"
160 (unless git-blame-mode
161 (error "git-blame is not active"))
166 (defun git-blame-run (&optional startline endline)
168 ;; Should maybe queue up a new run here
169 (message "Already running git blame")
170 (let ((display-buf (current-buffer))
171 (blame-buf (get-buffer-create
172 (concat " git blame for " (buffer-name))))
173 (args '("--incremental" "--contents" "-")))
175 (setq args (append args
176 (list "-L" (format "%d,%d" startline endline)))))
177 (setq args (append args
178 (list (file-name-nondirectory buffer-file-name))))
180 (apply 'start-process
181 "git-blame" blame-buf
184 (with-current-buffer blame-buf
186 (make-local-variable 'git-blame-file)
187 (make-local-variable 'git-blame-current)
188 (setq git-blame-file display-buf)
189 (setq git-blame-current nil))
190 (set-process-filter git-blame-proc 'git-blame-filter)
191 (set-process-sentinel git-blame-proc 'git-blame-sentinel)
192 (process-send-region git-blame-proc (point-min) (point-max))
193 (process-send-eof git-blame-proc))))
195 (defun remove-git-blame-text-properties (start end)
196 (let ((modified (buffer-modified-p))
197 (inhibit-read-only t))
198 (remove-text-properties start end '(point-entered nil))
199 (set-buffer-modified-p modified)))
201 (defun git-blame-cleanup ()
202 "Remove all blame properties"
203 (mapcar 'delete-overlay git-blame-overlays)
204 (setq git-blame-overlays nil)
205 (remove-git-blame-text-properties (point-min) (point-max)))
207 (defun git-blame-update-region (start end)
208 "Rerun blame to get updates between START and END"
209 (let ((overlays (overlays-in start end)))
211 (let ((overlay (pop overlays)))
212 (if (< (overlay-start overlay) start)
213 (setq start (overlay-start overlay)))
214 (if (> (overlay-end overlay) end)
215 (setq end (overlay-end overlay)))
216 (setq git-blame-overlays (delete overlay git-blame-overlays))
217 (delete-overlay overlay))))
218 (remove-git-blame-text-properties start end)
219 ;; We can be sure that start and end are at line breaks
220 (git-blame-run (1+ (count-lines (point-min) start))
221 (count-lines (point-min) end)))
223 (defun git-blame-sentinel (proc status)
224 (with-current-buffer (process-buffer proc)
225 (with-current-buffer git-blame-file
226 (setq git-blame-proc nil)
227 (if git-blame-update-queue
228 (git-blame-delayed-update))))
229 ;;(kill-buffer (process-buffer proc))
230 ;;(message "git blame finished")
233 (defvar in-blame-filter nil)
235 (defun git-blame-filter (proc str)
237 (set-buffer (process-buffer proc))
238 (goto-char (process-mark proc))
239 (insert-before-markers str)
241 (unless in-blame-filter
245 (setq more (git-blame-parse)))))))
247 (defun git-blame-parse ()
248 (cond ((looking-at "\\([0-9a-f]\\{40\\}\\) \\([0-9]+\\) \\([0-9]+\\) \\([0-9]+\\)\n")
249 (let ((hash (match-string 1))
250 (src-line (string-to-number (match-string 2)))
251 (res-line (string-to-number (match-string 3)))
252 (num-lines (string-to-number (match-string 4))))
253 (setq git-blame-current
254 (if (string= hash "0000000000000000000000000000000000000000")
256 (git-blame-new-commit
257 hash src-line res-line num-lines))))
258 (delete-region (point) (match-end 0))
260 ((looking-at "filename \\(.+\\)\n")
261 (let ((filename (match-string 1)))
262 (git-blame-add-info "filename" filename))
263 (delete-region (point) (match-end 0))
265 ((looking-at "\\([a-z-]+\\) \\(.+\\)\n")
266 (let ((key (match-string 1))
267 (value (match-string 2)))
268 (git-blame-add-info key value))
269 (delete-region (point) (match-end 0))
271 ((looking-at "boundary\n")
272 (setq git-blame-current nil)
273 (delete-region (point) (match-end 0))
279 (defun git-blame-new-commit (hash src-line res-line num-lines)
281 (set-buffer git-blame-file)
282 (let ((info (gethash hash git-blame-cache))
283 (inhibit-point-motion-hooks t)
284 (inhibit-modification-hooks t))
286 (let ((color (pop git-blame-colors)))
288 (setq color git-blame-ancient-color))
289 (setq info (list hash src-line res-line num-lines
290 (git-describe-commit hash)
291 (cons 'color color))))
292 (puthash hash info git-blame-cache))
294 (while (> num-lines 0)
295 (if (get-text-property (point) 'git-blame)
297 (let* ((start (point))
298 (end (progn (forward-line 1) (point)))
299 (ovl (make-overlay start end)))
300 (push ovl git-blame-overlays)
301 (overlay-put ovl 'git-blame info)
302 (overlay-put ovl 'help-echo hash)
303 (overlay-put ovl 'face (list :background
304 (cdr (assq 'color (nthcdr 5 info)))))
305 ;; the point-entered property doesn't seem to work in overlays
306 ;;(overlay-put ovl 'point-entered
307 ;; `(lambda (x y) (git-blame-identify ,hash)))
308 (let ((modified (buffer-modified-p)))
309 (put-text-property (if (= start 1) start (1- start)) (1- end)
311 `(lambda (x y) (git-blame-identify ,hash)))
312 (set-buffer-modified-p modified))))
313 (setq num-lines (1- num-lines))))))
315 (defun git-blame-add-info (key value)
316 (if git-blame-current
317 (nconc git-blame-current (list (cons (intern key) value)))))
319 (defun git-blame-current-commit ()
320 (let ((info (get-char-property (point) 'git-blame)))
323 (error "No commit info"))))
325 (defun git-describe-commit (hash)
327 (call-process "git" nil t nil
328 "log" "-1" "--pretty=oneline"
330 (buffer-substring (point-min) (1- (point-max)))))
332 (defvar git-blame-last-identification nil)
333 (make-variable-buffer-local 'git-blame-last-identification)
334 (defun git-blame-identify (&optional hash)
336 (let ((info (gethash (or hash (git-blame-current-commit)) git-blame-cache)))
337 (when (and info (not (eq info git-blame-last-identification)))
338 (message "%s" (nth 4 info))
339 (setq git-blame-last-identification info))))
341 ;; (defun git-blame-after-save ()
342 ;; (when git-blame-mode
343 ;; (git-blame-cleanup)
345 ;; (add-hook 'after-save-hook 'git-blame-after-save)
347 (defun git-blame-after-change (start end length)
349 (git-blame-enq-update start end)))
351 (defvar git-blame-last-update nil)
352 (make-variable-buffer-local 'git-blame-last-update)
353 (defun git-blame-enq-update (start end)
354 "Mark the region between START and END as needing blame update"
355 ;; Try to be smart and avoid multiple callouts for sequential
357 (cond ((and git-blame-last-update
358 (= start (cdr git-blame-last-update)))
359 (setcdr git-blame-last-update end))
360 ((and git-blame-last-update
361 (= end (car git-blame-last-update)))
362 (setcar git-blame-last-update start))
364 (setq git-blame-last-update (cons start end))
365 (setq git-blame-update-queue (nconc git-blame-update-queue
366 (list git-blame-last-update)))))
367 (unless (or git-blame-proc git-blame-idle-timer)
368 (setq git-blame-idle-timer
369 (run-with-idle-timer 0.5 nil 'git-blame-delayed-update))))
371 (defun git-blame-delayed-update ()
372 (setq git-blame-idle-timer nil)
373 (if git-blame-update-queue
374 (let ((first (pop git-blame-update-queue))
375 (inhibit-point-motion-hooks t))
376 (git-blame-update-region (car first) (cdr first)))))
380 ;;; git-blame.el ends here