Andrew's git - gitweb.git/blob - contrib/emacs/git-blame.el

   1;;; git-blame.el
   2;; David Kågedal <davidk@lysator.liu.se>
   3;; Message-ID: <87iren2vqx.fsf@morpheus.local>
   4
   5(require 'cl)
   6(defun color-scale (l)
   7  (let* ((colors ())
   8         r g b)
   9    (setq r l)
  10    (while r
  11      (setq g l)
  12      (while g
  13        (setq b l)
  14        (while b
  15          (push (concat "#" (car r) (car g) (car b)) colors)
  16          (pop b))
  17        (pop g))
  18      (pop r))
  19    colors))
  20
  21(defvar git-blame-dark-colors
  22  (color-scale '("00" "04" "08" "0c"
  23                 "10" "14" "18" "1c"
  24                 "20" "24" "28" "2c"
  25                 "30" "34" "38" "3c")))
  26
  27(defvar git-blame-light-colors
  28  (color-scale '("c0" "c4" "c8" "cc"
  29                 "d0" "d4" "d8" "dc"
  30                 "e0" "e4" "e8" "ec"
  31                 "f0" "f4" "f8" "fc")))
  32
  33(defvar git-blame-ancient-color "dark green")
  34
  35(defvar git-blame-overlays nil)
  36(defvar git-blame-cache nil)
  37
  38(defvar git-blame-mode nil)
  39(make-variable-buffer-local 'git-blame-mode)
  40(push (list 'git-blame-mode " blame") minor-mode-alist)
  41
  42(defun git-blame-mode (&optional arg)
  43  (interactive "P")
  44  (if arg
  45      (setq git-blame-mode (eq arg 1))
  46    (setq git-blame-mode (not git-blame-mode)))
  47  (make-local-variable 'git-blame-overlays)
  48  (make-local-variable 'git-blame-colors)
  49  (make-local-variable 'git-blame-cache)
  50  (let ((bgmode (cdr (assoc 'background-mode (frame-parameters)))))
  51    (if (eq bgmode 'dark)
  52        (setq git-blame-colors git-blame-dark-colors)
  53      (setq git-blame-colors git-blame-light-colors)))
  54  (if git-blame-mode
  55      (git-blame-run)
  56    (git-blame-cleanup)))
  57
  58(defun git-blame-run ()
  59  (let* ((display-buf (current-buffer))
  60         (blame-buf (get-buffer-create
  61                     (concat " git blame for " (buffer-name))))
  62         (proc (start-process "git-blame" blame-buf
  63                             "git" "blame" "--incremental"
  64                             (file-name-nondirectory buffer-file-name))))
  65    (mapcar 'delete-overlay git-blame-overlays)
  66    (setq git-blame-overlays nil)
  67    (setq git-blame-cache (make-hash-table :test 'equal))
  68    (with-current-buffer blame-buf
  69      (erase-buffer)
  70      (make-local-variable 'git-blame-file)
  71      (make-local-variable 'git-blame-current)
  72      (setq git-blame-file display-buf)
  73      (setq git-blame-current nil))
  74    (set-process-filter proc 'git-blame-filter)
  75    (set-process-sentinel proc 'git-blame-sentinel)))
  76
  77(defun git-blame-cleanup ()
  78  "Remove all blame properties"
  79    (mapcar 'delete-overlay git-blame-overlays)
  80    (setq git-blame-overlays nil)
  81    (let ((modified (buffer-modified-p)))
  82      (remove-text-properties (point-min) (point-max) '(point-entered nil))
  83      (set-buffer-modified-p modified)))
  84
  85(defun git-blame-sentinel (proc status)
  86  ;;(kill-buffer (process-buffer proc))
  87  (message "git blame finished"))
  88
  89(defvar in-blame-filter nil)
  90
  91(defun git-blame-filter (proc str)
  92  (save-excursion
  93    (set-buffer (process-buffer proc))
  94    (goto-char (process-mark proc))
  95    (insert-before-markers str)
  96    (goto-char 0)
  97    (unless in-blame-filter
  98      (let ((more t)
  99            (in-blame-filter t))
 100        (while more
 101          (setq more (git-blame-parse)))))))
 102
 103(defun git-blame-parse ()
 104  (cond ((looking-at "\\([0-9a-f]\\{40\\}\\) \\([0-9]+\\) \\([0-9]+\\) \\([0-9]+\\)\n")
 105         (let ((hash (match-string 1))
 106               (src-line (string-to-number (match-string 2)))
 107               (res-line (string-to-number (match-string 3)))
 108               (num-lines (string-to-number (match-string 4))))
 109           (setq git-blame-current
 110                 (git-blame-new-commit
 111                  hash src-line res-line num-lines)))
 112         (delete-region (point) (match-end 0))
 113         t)
 114        ((looking-at "filename \\(.+\\)\n")
 115         (let ((filename (match-string 1)))
 116           (git-blame-add-info "filename" filename))
 117         (delete-region (point) (match-end 0))
 118         t)
 119        ((looking-at "\\([a-z-]+\\) \\(.+\\)\n")
 120         (let ((key (match-string 1))
 121               (value (match-string 2)))
 122           (git-blame-add-info key value))
 123         (delete-region (point) (match-end 0))
 124         t)
 125        ((looking-at "boundary\n")
 126         (setq git-blame-current nil)
 127         (delete-region (point) (match-end 0))
 128         t)
 129        (t
 130         nil)))
 131
 132
 133(defun git-blame-new-commit (hash src-line res-line num-lines)
 134  (save-excursion
 135    (set-buffer git-blame-file)
 136    (let ((info (gethash hash git-blame-cache))
 137          (inhibit-point-motion-hooks t))
 138      (when (not info)
 139        (let ((color (pop git-blame-colors)))
 140          (unless color
 141            (setq color git-blame-ancient-color))
 142          (setq info (list hash src-line res-line num-lines
 143                           (cons 'color color))))
 144        (puthash hash info git-blame-cache))
 145      (goto-line res-line)
 146      (while (> num-lines 0)
 147        (if (get-text-property (point) 'git-blame)
 148            (forward-line)
 149          (let* ((start (point))
 150                 (end (progn (forward-line 1) (point)))
 151                 (ovl (make-overlay start end)))
 152            (push ovl git-blame-overlays)
 153            (overlay-put ovl 'git-blame info)
 154            (overlay-put ovl 'help-echo hash)
 155            (overlay-put ovl 'face (list :background
 156                                         (cdr (assq 'color (cddddr info)))))
 157            ;;(overlay-put ovl 'point-entered
 158            ;;             `(lambda (x y) (git-blame-identify ,hash)))
 159            (let ((modified (buffer-modified-p)))
 160              (put-text-property (if (= start 1) start (1- start)) (1- end)
 161                                 'point-entered
 162                                 `(lambda (x y) (git-blame-identify ,hash)))
 163              (set-buffer-modified-p modified))))
 164        (setq num-lines (1- num-lines))))))
 165
 166(defun git-blame-add-info (key value)
 167  (if git-blame-current
 168      (nconc git-blame-current (list (cons (intern key) value)))))
 169
 170(defun git-blame-current-commit ()
 171  (let ((info (get-char-property (point) 'git-blame)))
 172    (if info
 173        (car info)
 174      (error "No commit info"))))
 175
 176(defun git-blame-identify (&optional hash)
 177  (interactive)
 178  (shell-command
 179   (format "git log -1 --pretty=oneline %s" (or hash
 180                                                (git-blame-current-commit)))))