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| -rw-r--r-- | contrib/emacs/git-blame.el | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/contrib/emacs/git-blame.el b/contrib/emacs/git-blame.el new file mode 100644 index 000000000..62cf24c99 --- /dev/null +++ b/contrib/emacs/git-blame.el @@ -0,0 +1,180 @@ +;;; 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))))) |