git-blame.el: improve color handling
[tgit.git] / contrib / emacs / git-blame.el
blob7ffc153bdae12f40f007c70d9cf4cde588e47eac
1 ;;; git-blame.el --- Minor mode for incremental blame for Git -*- coding: utf-8 -*-
2 ;;
3 ;; Copyright (C) 2007 David Kågedal
4 ;;
5 ;; Authors: David Kågedal <davidk@lysator.liu.se>
6 ;; Created: 31 Jan 2007
7 ;; Message-ID: <87iren2vqx.fsf@morpheus.local>
8 ;; License: GPL
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,
30 ;; MA 02111-1307 USA
32 ;; http://www.fsf.org/copyleft/gpl.html
35 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
37 ;;; Commentary:
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.
45 ;;; Installation:
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.
62 ;;; Compatibility:
64 ;; It requires GNU Emacs 21. If you'are using Emacs 20, try
65 ;; changing this:
67 ;; (overlay-put ovl 'face (list :background
68 ;; (cdr (assq 'color (cddddr info)))))
70 ;; to
72 ;; (overlay-put ovl 'face (cons 'background-color
73 ;; (cdr (assq 'color (cddddr info)))))
76 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
78 ;;; Code:
80 (require 'cl) ; to use `push', `pop'
82 (defun color-scale (l)
83 (let* ((colors ())
84 r g b)
85 (setq r l)
86 (while r
87 (setq g l)
88 (while g
89 (setq b l)
90 (while b
91 (push (concat "#" (car r) (car g) (car b)) colors)
92 (pop b))
93 (pop g))
94 (pop r))
95 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-overlays nil)
106 (defvar git-blame-cache nil)
108 (defvar git-blame-mode nil)
109 (make-variable-buffer-local 'git-blame-mode)
110 (unless (assq 'git-blame-mode minor-mode-alist)
111 (setq minor-mode-alist
112 (cons (list 'git-blame-mode " blame")
113 minor-mode-alist)))
115 ;;;###autoload
116 (defun git-blame-mode (&optional arg)
117 (interactive "P")
118 (if arg
119 (setq git-blame-mode (eq arg 1))
120 (setq git-blame-mode (not git-blame-mode)))
121 (make-local-variable 'git-blame-overlays)
122 (make-local-variable 'git-blame-colors)
123 (make-local-variable 'git-blame-cache)
124 (git-blame-cleanup)
125 (if git-blame-mode
126 (progn
127 (let ((bgmode (cdr (assoc 'background-mode (frame-parameters)))))
128 (if (eq bgmode 'dark)
129 (setq git-blame-colors git-blame-dark-colors)
130 (setq git-blame-colors git-blame-light-colors)))
131 (setq git-blame-cache (make-hash-table :test 'equal))
132 (git-blame-run))))
134 (defun git-blame-run ()
135 (let* ((display-buf (current-buffer))
136 (blame-buf (get-buffer-create
137 (concat " git blame for " (buffer-name))))
138 (proc (start-process "git-blame" blame-buf
139 "git" "blame" "--incremental"
140 (file-name-nondirectory buffer-file-name))))
141 (mapcar 'delete-overlay git-blame-overlays)
142 (setq git-blame-overlays nil)
143 (setq git-blame-cache (make-hash-table :test 'equal))
144 (with-current-buffer blame-buf
145 (erase-buffer)
146 (make-local-variable 'git-blame-file)
147 (make-local-variable 'git-blame-current)
148 (setq git-blame-file display-buf)
149 (setq git-blame-current nil))
150 (set-process-filter proc 'git-blame-filter)
151 (set-process-sentinel proc 'git-blame-sentinel)))
153 (defun git-blame-cleanup ()
154 "Remove all blame properties"
155 (mapcar 'delete-overlay git-blame-overlays)
156 (setq git-blame-overlays nil)
157 (let ((modified (buffer-modified-p)))
158 (remove-text-properties (point-min) (point-max) '(point-entered nil))
159 (set-buffer-modified-p modified)))
161 (defun git-blame-sentinel (proc status)
162 ;;(kill-buffer (process-buffer proc))
163 (message "git blame finished"))
165 (defvar in-blame-filter nil)
167 (defun git-blame-filter (proc str)
168 (save-excursion
169 (set-buffer (process-buffer proc))
170 (goto-char (process-mark proc))
171 (insert-before-markers str)
172 (goto-char 0)
173 (unless in-blame-filter
174 (let ((more t)
175 (in-blame-filter t))
176 (while more
177 (setq more (git-blame-parse)))))))
179 (defun git-blame-parse ()
180 (cond ((looking-at "\\([0-9a-f]\\{40\\}\\) \\([0-9]+\\) \\([0-9]+\\) \\([0-9]+\\)\n")
181 (let ((hash (match-string 1))
182 (src-line (string-to-number (match-string 2)))
183 (res-line (string-to-number (match-string 3)))
184 (num-lines (string-to-number (match-string 4))))
185 (setq git-blame-current
186 (if (string= hash "0000000000000000000000000000000000000000")
188 (git-blame-new-commit
189 hash src-line res-line num-lines))))
190 (delete-region (point) (match-end 0))
192 ((looking-at "filename \\(.+\\)\n")
193 (let ((filename (match-string 1)))
194 (git-blame-add-info "filename" filename))
195 (delete-region (point) (match-end 0))
197 ((looking-at "\\([a-z-]+\\) \\(.+\\)\n")
198 (let ((key (match-string 1))
199 (value (match-string 2)))
200 (git-blame-add-info key value))
201 (delete-region (point) (match-end 0))
203 ((looking-at "boundary\n")
204 (setq git-blame-current nil)
205 (delete-region (point) (match-end 0))
208 nil)))
211 (defun git-blame-new-commit (hash src-line res-line num-lines)
212 (save-excursion
213 (set-buffer git-blame-file)
214 (let ((info (gethash hash git-blame-cache))
215 (inhibit-point-motion-hooks t))
216 (when (not info)
217 (let ((color (pop git-blame-colors)))
218 (unless color
219 (setq color git-blame-ancient-color))
220 (setq info (list hash src-line res-line num-lines
221 (git-describe-commit hash)
222 (cons 'color color))))
223 (puthash hash info git-blame-cache))
224 (goto-line res-line)
225 (while (> num-lines 0)
226 (if (get-text-property (point) 'git-blame)
227 (forward-line)
228 (let* ((start (point))
229 (end (progn (forward-line 1) (point)))
230 (ovl (make-overlay start end)))
231 (push ovl git-blame-overlays)
232 (overlay-put ovl 'git-blame info)
233 (overlay-put ovl 'help-echo hash)
234 (overlay-put ovl 'face (list :background
235 (cdr (assq 'color (nthcdr 5 info)))))
236 ;; the point-entered property doesn't seem to work in overlays
237 ;;(overlay-put ovl 'point-entered
238 ;; `(lambda (x y) (git-blame-identify ,hash)))
239 (let ((modified (buffer-modified-p)))
240 (put-text-property (if (= start 1) start (1- start)) (1- end)
241 'point-entered
242 `(lambda (x y) (git-blame-identify ,hash)))
243 (set-buffer-modified-p modified))))
244 (setq num-lines (1- num-lines))))))
246 (defun git-blame-add-info (key value)
247 (if git-blame-current
248 (nconc git-blame-current (list (cons (intern key) value)))))
250 (defun git-blame-current-commit ()
251 (let ((info (get-char-property (point) 'git-blame)))
252 (if info
253 (car info)
254 (error "No commit info"))))
256 (defun git-describe-commit (hash)
257 (with-temp-buffer
258 (call-process "git" nil t nil
259 "log" "-1" "--pretty=oneline"
260 hash)
261 (buffer-substring (point-min) (1- (point-max)))))
263 (defvar git-blame-last-identification nil)
264 (make-variable-buffer-local 'git-blame-last-identification)
265 (defun git-blame-identify (&optional hash)
266 (interactive)
267 (let ((info (gethash (or hash (git-blame-current-commit)) git-blame-cache)))
268 (when (and info (not (eq info git-blame-last-identification)))
269 (message "%s" (nth 4 info))
270 (setq git-blame-last-identification info))))
272 (provide 'git-blame)
274 ;;; git-blame.el ends here