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;;; git-blame.el
;; David Kågedal <davidk@lysator.liu.se>
;; Message-ID: <87iren2vqx.fsf@morpheus.local>
(require 'cl)
(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)))))
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