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git-blame.el: Change how blame information is shown.
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It is more customizable, and uses a line prefix to show the commit.

Signed-off-by: David Kågedal <davidk@lysator.liu.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
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David Kågedal authored and Shawn O. Pearce committed Sep 29, 2009
1 parent 1be224b commit c5022f5
Showing 1 changed file with 102 additions and 54 deletions.
156 changes: 102 additions & 54 deletions contrib/emacs/git-blame.el
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Expand Up @@ -80,6 +80,57 @@

(eval-when-compile (require 'cl)) ; to use `push', `pop'

(defface git-blame-prefix-face
'((((background dark)) (:foreground "gray"
:background "black"))
(((background light)) (:foreground "gray"
:background "white"))
(t (:weight bold)))
"The face used for the hash prefix."
:group 'git-blame)

(defgroup git-blame nil
"A minor mode showing Git blame information."
:group 'git
:link '(function-link git-blame-mode))


(defcustom git-blame-use-colors t
"Use colors to indicate commits in `git-blame-mode'."
:type 'boolean
:group 'git-blame)

(defcustom git-blame-prefix-format
"%h %20A:"
"The format of the prefix added to each line in `git-blame'
mode. The format is passed to `format-spec' with the following format keys:
%h - the abbreviated hash
%H - the full hash
%a - the author name
%A - the author email
%c - the committer name
%C - the committer email
%s - the commit summary
"
:group 'git-blame)

(defcustom git-blame-mouseover-format
"%h %a %A: %s"
"The format of the description shown when pointing at a line in
`git-blame' mode. The format string is passed to `format-spec'
with the following format keys:
%h - the abbreviated hash
%H - the full hash
%a - the author name
%A - the author email
%c - the committer name
%C - the committer email
%s - the commit summary
"
:group 'git-blame)


(defun git-blame-color-scale (&rest elements)
"Given a list, returns a list of triples formed with each
Expand Down Expand Up @@ -302,72 +353,69 @@ See also function `git-blame-mode'."
(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
(if (string= hash "0000000000000000000000000000000000000000")
nil
(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))
(delete-region (point) (match-end 0))
(setq git-blame-current (list (git-blame-new-commit hash)
src-line res-line num-lines)))
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))
(delete-region (point) (match-end 0))
(git-blame-add-info (car git-blame-current) key value)
(when (string= key "filename")
(git-blame-create-overlay (car git-blame-current)
(caddr git-blame-current)
(cadddr git-blame-current))
(setq git-blame-current nil)))
t)
(t
nil)))

(defun git-blame-new-commit (hash src-line res-line num-lines)
(defun git-blame-new-commit (hash)
(with-current-buffer git-blame-file
(or (gethash hash git-blame-cache)
;; Assign a random color to each new commit info
;; Take care not to select the same color multiple times
(let* ((color (if git-blame-colors
(git-blame-random-pop git-blame-colors)
git-blame-ancient-color))
(info `(,hash (color . ,color))))
(puthash hash info git-blame-cache)
info))))

(defun git-blame-create-overlay (info start-line num-lines)
(save-excursion
(set-buffer git-blame-file)
(let ((info (gethash hash git-blame-cache))
(inhibit-point-motion-hooks t)
(let ((inhibit-point-motion-hooks t)
(inhibit-modification-hooks t))
(when (not info)
;; Assign a random color to each new commit info
;; Take care not to select the same color multiple times
(let ((color (if git-blame-colors
(git-blame-random-pop git-blame-colors)
git-blame-ancient-color)))
(setq info (list hash src-line res-line num-lines
(git-describe-commit hash)
(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)
(goto-line start-line)
(let* ((start (point))
(end (progn (forward-line num-lines) (point)))
(ovl (make-overlay start end))
(hash (car info))
(spec `((?h . ,(substring hash 0 6))
(?H . ,hash)
(?a . ,(git-blame-get-info info 'author))
(?A . ,(git-blame-get-info info 'author-mail))
(?c . ,(git-blame-get-info info 'committer))
(?C . ,(git-blame-get-info info 'committer-mail))
(?s . ,(git-blame-get-info info 'summary)))))
(push ovl git-blame-overlays)
(overlay-put ovl 'git-blame info)
(overlay-put ovl 'help-echo
(format-spec git-blame-mouseover-format spec))
(if git-blame-use-colors
(overlay-put ovl 'face (list :background
(cdr (assq 'color (nthcdr 5 info)))))
;; the point-entered property doesn't seem to work in overlays
;;(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)))))
(cdr (assq 'color (cdr info))))))
(overlay-put ovl 'line-prefix
(propertize (format-spec git-blame-prefix-format spec)
'face 'git-blame-prefix-face))))))

(defun git-blame-add-info (info key value)
(nconc info (list (cons (intern key) value))))

(defun git-blame-get-info (info key)
(cdr (assq key (cdr info))))

(defun git-blame-current-commit ()
(let ((info (get-char-property (point) 'git-blame)))
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