Andrew's git / gitweb.git /
7ffc153bdae12f40f007c70d9cf4cde588e47eac
   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
  10;;
  11;; Compatibility: Emacs21
  12
  13
  14;; This file is *NOT* part of GNU Emacs.
  15;; This file is distributed under the same terms as GNU Emacs.
  16
  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.
  21
  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.
  26
  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
  31
  32;; http://www.fsf.org/copyleft/gpl.html
  33
  34
  35;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  36;;
  37;;; Commentary:
  38;;
  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.
  44
  45;;; Installation:
  46;;
  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:
  50;;
  51;;    (require 'git-blame)
  52;;
  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
  56;;
  57;;    (autoload 'git-blame-mode "git-blame"
  58;;              "Minor mode for incremental blame for Git." t)
  59;;
  60;; Then first use of `M-x git-blame-mode' would load the package.
  61
  62;;; Compatibility:
  63;;
  64;; It requires GNU Emacs 21.  If you'are using Emacs 20, try
  65;; changing this:
  66;;
  67;;            (overlay-put ovl 'face (list :background
  68;;                                         (cdr (assq 'color (cddddr info)))))
  69;;
  70;; to
  71;;
  72;;            (overlay-put ovl 'face (cons 'background-color
  73;;                                         (cdr (assq 'color (cddddr info)))))
  74
  75
  76;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  77;;
  78;;; Code:
  79
  80(require 'cl)                         ; to use `push', `pop'
  81
  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))
  96
  97(defvar git-blame-dark-colors
  98  (color-scale '("0c" "04" "24" "1c" "2c" "34" "14" "3c")))
  99
 100(defvar git-blame-light-colors
 101  (color-scale '("c4" "d4" "cc" "dc" "f4" "e4" "fc" "ec")))
 102
 103(defvar git-blame-ancient-color "dark green")
 104
 105(defvar git-blame-overlays nil)
 106(defvar git-blame-cache nil)
 107
 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)))
 114
 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))))
 133
 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)))
 152
 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)))
 160
 161(defun git-blame-sentinel (proc status)
 162  ;;(kill-buffer (process-buffer proc))
 163  (message "git blame finished"))
 164
 165(defvar in-blame-filter nil)
 166
 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)))))))
 178
 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")
 187                     nil
 188                   (git-blame-new-commit
 189                    hash src-line res-line num-lines))))
 190         (delete-region (point) (match-end 0))
 191         t)
 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))
 196         t)
 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))
 202         t)
 203        ((looking-at "boundary\n")
 204         (setq git-blame-current nil)
 205         (delete-region (point) (match-end 0))
 206         t)
 207        (t
 208         nil)))
 209
 210
 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))))))
 245
 246(defun git-blame-add-info (key value)
 247  (if git-blame-current
 248      (nconc git-blame-current (list (cons (intern key) value)))))
 249
 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"))))
 255
 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)))))
 262
 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))))
 271
 272(provide 'git-blame)
 273
 274;;; git-blame.el ends here