1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
;;; git-blame.el --- Minor mode for incremental blame for Git -*- coding: utf-8 -*-
;;
;; Copyright (C) 2007 David Kågedal
;;
;; Authors: David Kågedal <davidk@lysator.liu.se>
;; Created: 31 Jan 2007
;; Message-ID: <87iren2vqx.fsf@morpheus.local>
;; License: GPL
;; Keywords: git, version control, release management
;;
;; Compatibility: Emacs21
;; This file is *NOT* part of GNU Emacs.
;; This file is distributed under the same terms as GNU Emacs.
;; This program 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 of
;; the License, or (at your option) any later version.
;; This program 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 this program; if not, write to the Free
;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
;; MA 02111-1307 USA
;; http://www.fsf.org/copyleft/gpl.html
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;;
;; Here is an Emacs implementation of incremental git-blame. When you
;; turn it on while viewing a file, the editor buffer will be updated by
;; setting the background of individual lines to a color that reflects
;; which commit it comes from. And when you move around the buffer, a
;; one-line summary will be shown in the echo area.
;;; Installation:
;;
;; 1) Load into emacs: M-x load-file RET git-blame.el RET
;; 2) Open a git-controlled file
;; 3) Blame: M-x git-blame-mode
;;; Compatibility:
;;
;; It requires GNU Emacs 21. If you'are using Emacs 20, try
;; changing this:
;;
;; (overlay-put ovl 'face (list :background
;; (cdr (assq 'color (cddddr info)))))
;;
;; to
;;
;; (overlay-put ovl 'face (cons 'background-color
;; (cdr (assq 'color (cddddr info)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Code:
(require 'cl) ; to use `push', `pop'
(defun color-scale (l)
(let* ((colors ())
r g b)
(setq r l)
(while r
(setq g l)
(while g
(setq b l)
(while b
(push (concat "#" (car r) (car g) (car b)) colors)
(pop b))
(pop g))
(pop r))
colors))
(defvar git-blame-dark-colors
(color-scale '("00" "04" "08" "0c"
"10" "14" "18" "1c"
"20" "24" "28" "2c"
"30" "34" "38" "3c")))
(defvar git-blame-light-colors
(color-scale '("c0" "c4" "c8" "cc"
"d0" "d4" "d8" "dc"
"e0" "e4" "e8" "ec"
"f0" "f4" "f8" "fc")))
(defvar git-blame-ancient-color "dark green")
(defvar git-blame-overlays nil)
(defvar git-blame-cache nil)
(defvar git-blame-mode nil)
(make-variable-buffer-local 'git-blame-mode)
(push (list 'git-blame-mode " blame") minor-mode-alist)
(defun git-blame-mode (&optional arg)
(interactive "P")
(if arg
(setq git-blame-mode (eq arg 1))
(setq git-blame-mode (not git-blame-mode)))
(make-local-variable 'git-blame-overlays)
(make-local-variable 'git-blame-colors)
(make-local-variable 'git-blame-cache)
(let ((bgmode (cdr (assoc 'background-mode (frame-parameters)))))
(if (eq bgmode 'dark)
(setq git-blame-colors git-blame-dark-colors)
(setq git-blame-colors git-blame-light-colors)))
(if git-blame-mode
(git-blame-run)
(git-blame-cleanup)))
(defun git-blame-run ()
(let* ((display-buf (current-buffer))
(blame-buf (get-buffer-create
(concat " git blame for " (buffer-name))))
(proc (start-process "git-blame" blame-buf
"git" "blame" "--incremental"
(file-name-nondirectory buffer-file-name))))
(mapcar 'delete-overlay git-blame-overlays)
(setq git-blame-overlays nil)
(setq git-blame-cache (make-hash-table :test 'equal))
(with-current-buffer blame-buf
(erase-buffer)
(make-local-variable 'git-blame-file)
(make-local-variable 'git-blame-current)
(setq git-blame-file display-buf)
(setq git-blame-current nil))
(set-process-filter proc 'git-blame-filter)
(set-process-sentinel proc 'git-blame-sentinel)))
(defun git-blame-cleanup ()
"Remove all blame properties"
(mapcar 'delete-overlay git-blame-overlays)
(setq git-blame-overlays nil)
(let ((modified (buffer-modified-p)))
(remove-text-properties (point-min) (point-max) '(point-entered nil))
(set-buffer-modified-p modified)))
(defun git-blame-sentinel (proc status)
;;(kill-buffer (process-buffer proc))
(message "git blame finished"))
(defvar in-blame-filter nil)
(defun git-blame-filter (proc str)
(save-excursion
(set-buffer (process-buffer proc))
(goto-char (process-mark proc))
(insert-before-markers str)
(goto-char 0)
(unless in-blame-filter
(let ((more t)
(in-blame-filter t))
(while more
(setq more (git-blame-parse)))))))
(defun git-blame-parse ()
(cond ((looking-at "\\([0-9a-f]\\{40\\}\\) \\([0-9]+\\) \\([0-9]+\\) \\([0-9]+\\)\n")
(let ((hash (match-string 1))
(src-line (string-to-number (match-string 2)))
(res-line (string-to-number (match-string 3)))
(num-lines (string-to-number (match-string 4))))
(setq git-blame-current
(git-blame-new-commit
hash src-line res-line num-lines)))
(delete-region (point) (match-end 0))
t)
((looking-at "filename \\(.+\\)\n")
(let ((filename (match-string 1)))
(git-blame-add-info "filename" filename))
(delete-region (point) (match-end 0))
t)
((looking-at "\\([a-z-]+\\) \\(.+\\)\n")
(let ((key (match-string 1))
(value (match-string 2)))
(git-blame-add-info key value))
(delete-region (point) (match-end 0))
t)
((looking-at "boundary\n")
(setq git-blame-current nil)
(delete-region (point) (match-end 0))
t)
(t
nil)))
(defun git-blame-new-commit (hash src-line res-line num-lines)
(save-excursion
(set-buffer git-blame-file)
(let ((info (gethash hash git-blame-cache))
(inhibit-point-motion-hooks t))
(when (not info)
(let ((color (pop git-blame-colors)))
(unless color
(setq color git-blame-ancient-color))
(setq info (list hash src-line res-line num-lines
(cons 'color color))))
(puthash hash info git-blame-cache))
(goto-line res-line)
(while (> num-lines 0)
(if (get-text-property (point) 'git-blame)
(forward-line)
(let* ((start (point))
(end (progn (forward-line 1) (point)))
(ovl (make-overlay start end)))
(push ovl git-blame-overlays)
(overlay-put ovl 'git-blame info)
(overlay-put ovl 'help-echo hash)
(overlay-put ovl 'face (list :background
(cdr (assq 'color (cddddr info)))))
;;(overlay-put ovl 'point-entered
;; `(lambda (x y) (git-blame-identify ,hash)))
(let ((modified (buffer-modified-p)))
(put-text-property (if (= start 1) start (1- start)) (1- end)
'point-entered
`(lambda (x y) (git-blame-identify ,hash)))
(set-buffer-modified-p modified))))
(setq num-lines (1- num-lines))))))
(defun git-blame-add-info (key value)
(if git-blame-current
(nconc git-blame-current (list (cons (intern key) value)))))
(defun git-blame-current-commit ()
(let ((info (get-char-property (point) 'git-blame)))
(if info
(car info)
(error "No commit info"))))
(defun git-blame-identify (&optional hash)
(interactive)
(shell-command
(format "git log -1 --pretty=oneline %s" (or hash
(git-blame-current-commit)))))
(provide 'git-blame)
;;; git-blame.el ends here
|
