contrib/emacs/git.el

   1 ;;; git.el --- A user interface for git
   2
   3 ;; Copyright (C) 2005, 2006, 2007 Alexandre Julliard <julliard@winehq.org>
   4
   5 ;; Version: 1.0
   6
   7 ;; This program is free software; you can redistribute it and/or
   8 ;; modify it under the terms of the GNU General Public License as
   9 ;; published by the Free Software Foundation; either version 2 of
  10 ;; the License, or (at your option) any later version.
  11 ;;
  12 ;; This program is distributed in the hope that it will be
  13 ;; useful, but WITHOUT ANY WARRANTY; without even the implied
  14 ;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  15 ;; PURPOSE.  See the GNU General Public License for more details.
  16 ;;
  17 ;; You should have received a copy of the GNU General Public
  18 ;; License along with this program; if not, write to the Free
  19 ;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20 ;; MA 02111-1307 USA
  21
  22 ;;; Commentary:
  23
  24 ;; This file contains an interface for the git version control
  25 ;; system. It provides easy access to the most frequently used git
  26 ;; commands. The user interface is as far as possible identical to
  27 ;; that of the PCL-CVS mode.
  28 ;;
  29 ;; To install: put this file on the load-path and place the following
  30 ;; in your .emacs file:
  31 ;;
  32 ;;    (require 'git)
  33 ;;
  34 ;; To start: `M-x git-status'
  35 ;;
  36 ;; TODO
  37 ;;  - portability to XEmacs
  38 ;;  - better handling of subprocess errors
  39 ;;  - hook into file save (after-save-hook)
  40 ;;  - diff against other branch
  41 ;;  - renaming files from the status buffer
  42 ;;  - creating tags
  43 ;;  - fetch/pull
  44 ;;  - switching branches
  45 ;;  - revlist browser
  46 ;;  - git-show-branch browser
  47 ;;  - menus
  48 ;;
  49
  50 (eval-when-compile (require 'cl))
  51 (require 'ewoc)
  52 (require 'log-edit)
  53
  54
  55 ;;;; Customizations
  56 ;;;; ------------------------------------------------------------
  57
  58 (defgroup git nil
  59   "A user interface for the git versioning system."
  60   :group 'tools)
  61
  62 (defcustom git-committer-name nil
  63   "User name to use for commits.
  64 The default is to fall back to the repository config,
  65 then to `add-log-full-name' and then to `user-full-name'."
  66   :group 'git
  67   :type '(choice (const :tag "Default" nil)
  68                  (string :tag "Name")))
  69
  70 (defcustom git-committer-email nil
  71   "Email address to use for commits.
  72 The default is to fall back to the git repository config,
  73 then to `add-log-mailing-address' and then to `user-mail-address'."
  74   :group 'git
  75   :type '(choice (const :tag "Default" nil)
  76                  (string :tag "Email")))
  77
  78 (defcustom git-commits-coding-system nil
  79   "Default coding system for the log message of git commits."
  80   :group 'git
  81   :type '(choice (const :tag "From repository config" nil)
  82                  (coding-system)))
  83
  84 (defcustom git-append-signed-off-by nil
  85   "Whether to append a Signed-off-by line to the commit message before editing."
  86   :group 'git
  87   :type 'boolean)
  88
  89 (defcustom git-reuse-status-buffer t
  90   "Whether `git-status' should try to reuse an existing buffer
  91 if there is already one that displays the same directory."
  92   :group 'git
  93   :type 'boolean)
  94
  95 (defcustom git-per-dir-ignore-file ".gitignore"
  96   "Name of the per-directory ignore file."
  97   :group 'git
  98   :type 'string)
  99
 100
 101 (defface git-status-face
 102   '((((class color) (background light)) (:foreground "purple")))
 103   "Git mode face used to highlight added and modified files."
 104   :group 'git)
 105
 106 (defface git-unmerged-face
 107   '((((class color) (background light)) (:foreground "red" :bold t)))
 108   "Git mode face used to highlight unmerged files."
 109   :group 'git)
 110
 111 (defface git-unknown-face
 112   '((((class color) (background light)) (:foreground "goldenrod" :bold t)))
 113   "Git mode face used to highlight unknown files."
 114   :group 'git)
 115
 116 (defface git-uptodate-face
 117   '((((class color) (background light)) (:foreground "grey60")))
 118   "Git mode face used to highlight up-to-date files."
 119   :group 'git)
 120
 121 (defface git-ignored-face
 122   '((((class color) (background light)) (:foreground "grey60")))
 123   "Git mode face used to highlight ignored files."
 124   :group 'git)
 125
 126 (defface git-mark-face
 127   '((((class color) (background light)) (:foreground "red" :bold t)))
 128   "Git mode face used for the file marks."
 129   :group 'git)
 130
 131 (defface git-header-face
 132   '((((class color) (background light)) (:foreground "blue")))
 133   "Git mode face used for commit headers."
 134   :group 'git)
 135
 136 (defface git-separator-face
 137   '((((class color) (background light)) (:foreground "brown")))
 138   "Git mode face used for commit separator."
 139   :group 'git)
 140
 141 (defface git-permission-face
 142   '((((class color) (background light)) (:foreground "green" :bold t)))
 143   "Git mode face used for permission changes."
 144   :group 'git)
 145
 146
 147 ;;;; Utilities
 148 ;;;; ------------------------------------------------------------
 149
 150 (defconst git-log-msg-separator "--- log message follows this line ---")
 151
 152 (defvar git-log-edit-font-lock-keywords
 153   `(("^\\(Author:\\|Date:\\|Parent:\\|Signed-off-by:\\)\\(.*\\)$"
 154      (1 font-lock-keyword-face)
 155      (2 font-lock-function-name-face))
 156     (,(concat "^\\(" (regexp-quote git-log-msg-separator) "\\)$")
 157      (1 font-lock-comment-face))))
 158
 159 (defun git-get-env-strings (env)
 160   "Build a list of NAME=VALUE strings from a list of environment strings."
 161   (mapcar (lambda (entry) (concat (car entry) "=" (cdr entry))) env))
 162
 163 (defun git-call-process-env (buffer env &rest args)
 164   "Wrapper for call-process that sets environment strings."
 165   (if env
 166       (apply #'call-process "env" nil buffer nil
 167              (append (git-get-env-strings env) (list "git") args))
 168     (apply #'call-process "git" nil buffer nil args)))
 169
 170 (defun git-call-process-env-string (env &rest args)
 171   "Wrapper for call-process that sets environment strings,
 172 and returns the process output as a string."
 173   (with-temp-buffer
 174     (and (eq 0 (apply #' git-call-process-env t env args))
 175          (buffer-string))))
 176
 177 (defun git-run-process-region (buffer start end program args)
 178   "Run a git process with a buffer region as input."
 179   (let ((output-buffer (current-buffer))
 180         (dir default-directory))
 181     (with-current-buffer buffer
 182       (cd dir)
 183       (apply #'call-process-region start end program
 184              nil (list output-buffer nil) nil args))))
 185
 186 (defun git-run-command-buffer (buffer-name &rest args)
 187   "Run a git command, sending the output to a buffer named BUFFER-NAME."
 188   (let ((dir default-directory)
 189         (buffer (get-buffer-create buffer-name)))
 190     (message "Running git %s..." (car args))
 191     (with-current-buffer buffer
 192       (let ((default-directory dir)
 193             (buffer-read-only nil))
 194         (erase-buffer)
 195         (apply #'git-call-process-env buffer nil args)))
 196     (message "Running git %s...done" (car args))
 197     buffer))
 198
 199 (defun git-run-command (buffer env &rest args)
 200   (message "Running git %s..." (car args))
 201   (apply #'git-call-process-env buffer env args)
 202   (message "Running git %s...done" (car args)))
 203
 204 (defun git-run-command-region (buffer start end env &rest args)
 205   "Run a git command with specified buffer region as input."
 206   (message "Running git %s..." (car args))
 207   (unless (eq 0 (if env
 208                     (git-run-process-region
 209                      buffer start end "env"
 210                      (append (git-get-env-strings env) (list "git") args))
 211                   (git-run-process-region
 212                    buffer start end "git" args)))
 213     (error "Failed to run \"git %s\":\n%s" (mapconcat (lambda (x) x) args " ") (buffer-string)))
 214   (message "Running git %s...done" (car args)))
 215
 216 (defun git-run-hook (hook env &rest args)
 217   "Run a git hook and display its output if any."
 218   (let ((dir default-directory)
 219         (hook-name (expand-file-name (concat ".git/hooks/" hook))))
 220     (or (not (file-executable-p hook-name))
 221         (let (status (buffer (get-buffer-create "*Git Hook Output*")))
 222           (with-current-buffer buffer
 223             (erase-buffer)
 224             (cd dir)
 225             (setq status
 226                   (if env
 227                       (apply #'call-process "env" nil (list buffer t) nil
 228                              (append (git-get-env-strings env) (list hook-name) args))
 229                     (apply #'call-process hook-name nil (list buffer t) nil args))))
 230           (display-message-or-buffer buffer)
 231           (eq 0 status)))))
 232
 233 (defun git-get-string-sha1 (string)
 234   "Read a SHA1 from the specified string."
 235   (and string
 236        (string-match "[0-9a-f]\\{40\\}" string)
 237        (match-string 0 string)))
 238
 239 (defun git-get-committer-name ()
 240   "Return the name to use as GIT_COMMITTER_NAME."
 241   ; copied from log-edit
 242   (or git-committer-name
 243       (git-config "user.name")
 244       (and (boundp 'add-log-full-name) add-log-full-name)
 245       (and (fboundp 'user-full-name) (user-full-name))
 246       (and (boundp 'user-full-name) user-full-name)))
 247
 248 (defun git-get-committer-email ()
 249   "Return the email address to use as GIT_COMMITTER_EMAIL."
 250   ; copied from log-edit
 251   (or git-committer-email
 252       (git-config "user.email")
 253       (and (boundp 'add-log-mailing-address) add-log-mailing-address)
 254       (and (fboundp 'user-mail-address) (user-mail-address))
 255       (and (boundp 'user-mail-address) user-mail-address)))
 256
 257 (defun git-get-commits-coding-system ()
 258   "Return the coding system to use for commits."
 259   (let ((repo-config (git-config "i18n.commitencoding")))
 260     (or git-commits-coding-system
 261         (and repo-config
 262              (fboundp 'locale-charset-to-coding-system)
 263              (locale-charset-to-coding-system repo-config))
 264       'utf-8)))
 265
 266 (defun git-get-logoutput-coding-system ()
 267   "Return the coding system used for git-log output."
 268   (let ((repo-config (or (git-config "i18n.logoutputencoding")
 269                          (git-config "i18n.commitencoding"))))
 270     (or git-commits-coding-system
 271         (and repo-config
 272              (fboundp 'locale-charset-to-coding-system)
 273              (locale-charset-to-coding-system repo-config))
 274       'utf-8)))
 275
 276 (defun git-escape-file-name (name)
 277   "Escape a file name if necessary."
 278   (if (string-match "[\n\t\"\\]" name)
 279       (concat "\""
 280               (mapconcat (lambda (c)
 281                    (case c
 282                      (?\n "\\n")
 283                      (?\t "\\t")
 284                      (?\\ "\\\\")
 285                      (?\" "\\\"")
 286                      (t (char-to-string c))))
 287                  name "")
 288               "\"")
 289     name))
 290
 291 (defun git-get-top-dir (dir)
 292   "Retrieve the top-level directory of a git tree."
 293   (let ((cdup (with-output-to-string
 294                 (with-current-buffer standard-output
 295                   (cd dir)
 296                   (unless (eq 0 (call-process "git" nil t nil "rev-parse" "--show-cdup"))
 297                     (error "cannot find top-level git tree for %s." dir))))))
 298     (expand-file-name (concat (file-name-as-directory dir)
 299                               (car (split-string cdup "\n"))))))
 300
 301 ;stolen from pcl-cvs
 302 (defun git-append-to-ignore (file)
 303   "Add a file name to the ignore file in its directory."
 304   (let* ((fullname (expand-file-name file))
 305          (dir (file-name-directory fullname))
 306          (name (file-name-nondirectory fullname))
 307          (ignore-name (expand-file-name git-per-dir-ignore-file dir))
 308          (created (not (file-exists-p ignore-name))))
 309   (save-window-excursion
 310     (set-buffer (find-file-noselect ignore-name))
 311     (goto-char (point-max))
 312     (unless (zerop (current-column)) (insert "\n"))
 313     (insert "/" name "\n")
 314     (sort-lines nil (point-min) (point-max))
 315     (save-buffer))
 316   (when created
 317     (git-run-command nil nil "update-index" "--info-only" "--add" "--" (file-relative-name ignore-name)))
 318   (git-add-status-file (if created 'added 'modified) (file-relative-name ignore-name))))
 319
 320 ; propertize definition for XEmacs, stolen from erc-compat
 321 (eval-when-compile
 322   (unless (fboundp 'propertize)
 323     (defun propertize (string &rest props)
 324       (let ((string (copy-sequence string)))
 325         (while props
 326           (put-text-property 0 (length string) (nth 0 props) (nth 1 props) string)
 327           (setq props (cddr props)))
 328         string))))
 329
 330 ;;;; Wrappers for basic git commands
 331 ;;;; ------------------------------------------------------------
 332
 333 (defun git-rev-parse (rev)
 334   "Parse a revision name and return its SHA1."
 335   (git-get-string-sha1
 336    (git-call-process-env-string nil "rev-parse" rev)))
 337
 338 (defun git-config (key)
 339   "Retrieve the value associated to KEY in the git repository config file."
 340   (let ((str (git-call-process-env-string nil "config" key)))
 341     (and str (car (split-string str "\n")))))
 342
 343 (defun git-symbolic-ref (ref)
 344   "Wrapper for the git-symbolic-ref command."
 345   (let ((str (git-call-process-env-string nil "symbolic-ref" ref)))
 346     (and str (car (split-string str "\n")))))
 347
 348 (defun git-update-ref (ref newval &optional oldval reason)
 349   "Update a reference by calling git-update-ref."
 350   (let ((args (and oldval (list oldval))))
 351     (push newval args)
 352     (push ref args)
 353     (when reason
 354      (push reason args)
 355      (push "-m" args))
 356     (eq 0 (apply #'git-call-process-env nil nil "update-ref" args))))
 357
 358 (defun git-read-tree (tree &optional index-file)
 359   "Read a tree into the index file."
 360   (apply #'git-call-process-env nil
 361          (if index-file `(("GIT_INDEX_FILE" . ,index-file)) nil)
 362          "read-tree" (if tree (list tree))))
 363
 364 (defun git-write-tree (&optional index-file)
 365   "Call git-write-tree and return the resulting tree SHA1 as a string."
 366   (git-get-string-sha1
 367    (git-call-process-env-string (and index-file `(("GIT_INDEX_FILE" . ,index-file))) "write-tree")))
 368
 369 (defun git-commit-tree (buffer tree head)
 370   "Call git-commit-tree with buffer as input and return the resulting commit SHA1."
 371   (let ((author-name (git-get-committer-name))
 372         (author-email (git-get-committer-email))
 373         (subject "commit (initial): ")
 374         author-date log-start log-end args coding-system-for-write)
 375     (when head
 376       (setq subject "commit: ")
 377       (push "-p" args)
 378       (push head args))
 379     (with-current-buffer buffer
 380       (goto-char (point-min))
 381       (if
 382           (setq log-start (re-search-forward (concat "^" (regexp-quote git-log-msg-separator) "\n") nil t))
 383           (save-restriction
 384             (narrow-to-region (point-min) log-start)
 385             (goto-char (point-min))
 386             (when (re-search-forward "^Author: +\\(.*?\\) *<\\(.*\\)> *$" nil t)
 387               (setq author-name (match-string 1)
 388                     author-email (match-string 2)))
 389             (goto-char (point-min))
 390             (when (re-search-forward "^Date: +\\(.*\\)$" nil t)
 391               (setq author-date (match-string 1)))
 392             (goto-char (point-min))
 393             (while (re-search-forward "^Parent: +\\([0-9a-f]+\\)" nil t)
 394               (unless (string-equal head (match-string 1))
 395                 (setq subject "commit (merge): ")
 396                 (push "-p" args)
 397                 (push (match-string 1) args))))
 398         (setq log-start (point-min)))
 399       (setq log-end (point-max))
 400       (goto-char log-start)
 401       (when (re-search-forward ".*$" nil t)
 402         (setq subject (concat subject (match-string 0))))
 403       (setq coding-system-for-write buffer-file-coding-system))
 404     (let ((commit
 405            (git-get-string-sha1
 406             (with-output-to-string
 407               (with-current-buffer standard-output
 408                 (let ((env `(("GIT_AUTHOR_NAME" . ,author-name)
 409                              ("GIT_AUTHOR_EMAIL" . ,author-email)
 410                              ("GIT_COMMITTER_NAME" . ,(git-get-committer-name))
 411                              ("GIT_COMMITTER_EMAIL" . ,(git-get-committer-email)))))
 412                   (when author-date (push `("GIT_AUTHOR_DATE" . ,author-date) env))
 413                   (apply #'git-run-command-region
 414                          buffer log-start log-end env
 415                          "commit-tree" tree (nreverse args))))))))
 416       (and (git-update-ref "HEAD" commit head subject)
 417            commit))))
 418
 419 (defun git-empty-db-p ()
 420   "Check if the git db is empty (no commit done yet)."
 421   (not (eq 0 (call-process "git" nil nil nil "rev-parse" "--verify" "HEAD"))))
 422
 423 (defun git-get-merge-heads ()
 424   "Retrieve the merge heads from the MERGE_HEAD file if present."
 425   (let (heads)
 426     (when (file-readable-p ".git/MERGE_HEAD")
 427       (with-temp-buffer
 428         (insert-file-contents ".git/MERGE_HEAD" nil nil nil t)
 429         (goto-char (point-min))
 430         (while (re-search-forward "[0-9a-f]\\{40\\}" nil t)
 431           (push (match-string 0) heads))))
 432     (nreverse heads)))
 433
 434 (defun git-get-commit-description (commit)
 435   "Get a one-line description of COMMIT."
 436   (let ((coding-system-for-read (git-get-logoutput-coding-system)))
 437     (let ((descr (git-call-process-env-string nil "log" "--max-count=1" "--pretty=oneline" commit)))
 438       (if (and descr (string-match "\\`\\([0-9a-f]\\{40\\}\\) *\\(.*\\)$" descr))
 439           (concat (substring (match-string 1 descr) 0 10) " - " (match-string 2 descr))
 440         descr))))
 441
 442 ;;;; File info structure
 443 ;;;; ------------------------------------------------------------
 444
 445 ; fileinfo structure stolen from pcl-cvs
 446 (defstruct (git-fileinfo
 447             (:copier nil)
 448             (:constructor git-create-fileinfo (state name &optional old-perm new-perm rename-state orig-name marked))
 449             (:conc-name git-fileinfo->))
 450   marked              ;; t/nil
 451   state               ;; current state
 452   name                ;; file name
 453   old-perm new-perm   ;; permission flags
 454   rename-state        ;; rename or copy state
 455   orig-name           ;; original name for renames or copies
 456   needs-refresh)      ;; whether file needs to be refreshed
 457
 458 (defvar git-status nil)
 459
 460 (defun git-clear-status (status)
 461   "Remove everything from the status list."
 462   (ewoc-filter status (lambda (info) nil)))
 463
 464 (defun git-set-files-state (files state)
 465   "Set the state of a list of files."
 466   (dolist (info files)
 467     (unless (eq (git-fileinfo->state info) state)
 468       (setf (git-fileinfo->state info) state)
 469       (setf (git-fileinfo->rename-state info) nil)
 470       (setf (git-fileinfo->orig-name info) nil)
 471       (setf (git-fileinfo->needs-refresh info) t))))
 472
 473 (defun git-state-code (code)
 474   "Convert from a string to a added/deleted/modified state."
 475   (case (string-to-char code)
 476     (?M 'modified)
 477     (?? 'unknown)
 478     (?A 'added)
 479     (?D 'deleted)
 480     (?U 'unmerged)
 481     (t nil)))
 482
 483 (defun git-status-code-as-string (code)
 484   "Format a git status code as string."
 485   (case code
 486     ('modified (propertize "Modified" 'face 'git-status-face))
 487     ('unknown  (propertize "Unknown " 'face 'git-unknown-face))
 488     ('added    (propertize "Added   " 'face 'git-status-face))
 489     ('deleted  (propertize "Deleted " 'face 'git-status-face))
 490     ('unmerged (propertize "Unmerged" 'face 'git-unmerged-face))
 491     ('uptodate (propertize "Uptodate" 'face 'git-uptodate-face))
 492     ('ignored  (propertize "Ignored " 'face 'git-ignored-face))
 493     (t "?       ")))
 494
 495 (defun git-rename-as-string (info)
 496   "Return a string describing the copy or rename associated with INFO, or an empty string if none."
 497   (let ((state (git-fileinfo->rename-state info)))
 498     (if state
 499         (propertize
 500          (concat "   ("
 501                  (if (eq state 'copy) "copied from "
 502                    (if (eq (git-fileinfo->state info) 'added) "renamed from "
 503                      "renamed to "))
 504                  (git-escape-file-name (git-fileinfo->orig-name info))
 505                  ")") 'face 'git-status-face)
 506       "")))
 507
 508 (defun git-permissions-as-string (old-perm new-perm)
 509   "Format a permission change as string."
 510   (propertize
 511    (if (or (not old-perm)
 512            (not new-perm)
 513            (eq 0 (logand ?\111 (logxor old-perm new-perm))))
 514        "  "
 515      (if (eq 0 (logand ?\111 old-perm)) "+x" "-x"))
 516   'face 'git-permission-face))
 517
 518 (defun git-fileinfo-prettyprint (info)
 519   "Pretty-printer for the git-fileinfo structure."
 520   (insert (concat "   " (if (git-fileinfo->marked info) (propertize "*" 'face 'git-mark-face) " ")
 521                   " " (git-status-code-as-string (git-fileinfo->state info))
 522                   " " (git-permissions-as-string (git-fileinfo->old-perm info) (git-fileinfo->new-perm info))
 523                   "  " (git-escape-file-name (git-fileinfo->name info))
 524                   (git-rename-as-string info))))
 525
 526 (defun git-parse-status (status)
 527   "Parse the output of git-diff-index in the current buffer."
 528   (goto-char (point-min))
 529   (while (re-search-forward
 530           ":\\([0-7]\\{6\\}\\) \\([0-7]\\{6\\}\\) [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} \\(\\([ADMU]\\)\0\\([^\0]+\\)\\|\\([CR]\\)[0-9]*\0\\([^\0]+\\)\0\\([^\0]+\\)\\)\0"
 531           nil t 1)
 532     (let ((old-perm (string-to-number (match-string 1) 8))
 533           (new-perm (string-to-number (match-string 2) 8))
 534           (state (or (match-string 4) (match-string 6)))
 535           (name (or (match-string 5) (match-string 7)))
 536           (new-name (match-string 8)))
 537       (if new-name  ; copy or rename
 538           (if (eq ?C (string-to-char state))
 539               (ewoc-enter-last status (git-create-fileinfo 'added new-name old-perm new-perm 'copy name))
 540             (ewoc-enter-last status (git-create-fileinfo 'deleted name 0 0 'rename new-name))
 541             (ewoc-enter-last status (git-create-fileinfo 'added new-name old-perm new-perm 'rename name)))
 542         (ewoc-enter-last status (git-create-fileinfo (git-state-code state) name old-perm new-perm))))))
 543
 544 (defun git-find-status-file (status file)
 545   "Find a given file in the status ewoc and return its node."
 546   (let ((node (ewoc-nth status 0)))
 547     (while (and node (not (string= file (git-fileinfo->name (ewoc-data node)))))
 548       (setq node (ewoc-next status node)))
 549     node))
 550
 551 (defun git-parse-ls-files (status default-state &optional skip-existing)
 552   "Parse the output of git-ls-files in the current buffer."
 553   (goto-char (point-min))
 554   (let (infolist)
 555     (while (re-search-forward "\\([HMRCK?]\\) \\([^\0]*\\)\0" nil t 1)
 556       (let ((state (match-string 1))
 557             (name (match-string 2)))
 558         (unless (and skip-existing (git-find-status-file status name))
 559           (push (git-create-fileinfo (or (git-state-code state) default-state) name) infolist))))
 560     (dolist (info (nreverse infolist))
 561       (ewoc-enter-last status info))))
 562
 563 (defun git-parse-ls-unmerged (status)
 564   "Parse the output of git-ls-files -u in the current buffer."
 565   (goto-char (point-min))
 566   (let (files)
 567     (while (re-search-forward "[0-7]\\{6\\} [0-9a-f]\\{40\\} [123]\t\\([^\0]+\\)\0" nil t)
 568       (let ((node (git-find-status-file status (match-string 1))))
 569         (when node (push (ewoc-data node) files))))
 570     (git-set-files-state files 'unmerged)))
 571
 572 (defun git-add-status-file (state name)
 573   "Add a new file to the status list (if not existing already) and return its node."
 574   (unless git-status (error "Not in git-status buffer."))
 575   (or (git-find-status-file git-status name)
 576       (ewoc-enter-last git-status (git-create-fileinfo state name))))
 577
 578 (defun git-marked-files ()
 579   "Return a list of all marked files, or if none a list containing just the file at cursor position."
 580   (unless git-status (error "Not in git-status buffer."))
 581   (or (ewoc-collect git-status (lambda (info) (git-fileinfo->marked info)))
 582       (list (ewoc-data (ewoc-locate git-status)))))
 583
 584 (defun git-marked-files-state (&rest states)
 585   "Return marked files that are in the specified states."
 586   (let ((files (git-marked-files))
 587         result)
 588     (dolist (info files)
 589       (when (memq (git-fileinfo->state info) states)
 590         (push info result)))
 591     result))
 592
 593 (defun git-refresh-files ()
 594   "Refresh all files that need it and clear the needs-refresh flag."
 595   (unless git-status (error "Not in git-status buffer."))
 596   (ewoc-map
 597    (lambda (info)
 598      (let ((refresh (git-fileinfo->needs-refresh info)))
 599        (setf (git-fileinfo->needs-refresh info) nil)
 600        refresh))
 601    git-status)
 602   ; move back to goal column
 603   (when goal-column (move-to-column goal-column)))
 604
 605 (defun git-refresh-ewoc-hf (status)
 606   "Refresh the ewoc header and footer."
 607   (let ((branch (git-symbolic-ref "HEAD"))
 608         (head (if (git-empty-db-p) "Nothing committed yet"
 609                 (git-get-commit-description "HEAD")))
 610         (merge-heads (git-get-merge-heads)))
 611     (ewoc-set-hf status
 612                  (format "Directory:  %s\nBranch:     %s\nHead:       %s%s\n"
 613                          default-directory
 614                          (if (string-match "^refs/heads/" branch)
 615                              (substring branch (match-end 0))
 616                            branch)
 617                          head
 618                          (if merge-heads
 619                              (concat "\nMerging:    "
 620                                      (mapconcat (lambda (str) (git-get-commit-description str)) merge-heads "\n            "))
 621                            ""))
 622                  (if (ewoc-nth status 0) "" "    No changes."))))
 623
 624 (defun git-get-filenames (files)
 625   (mapcar (lambda (info) (git-fileinfo->name info)) files))
 626
 627 (defun git-update-index (index-file files)
 628   "Run git-update-index on a list of files."
 629   (let ((env (and index-file `(("GIT_INDEX_FILE" . ,index-file))))
 630         added deleted modified)
 631     (dolist (info files)
 632       (case (git-fileinfo->state info)
 633         ('added (push info added))
 634         ('deleted (push info deleted))
 635         ('modified (push info modified))))
 636     (when added
 637       (apply #'git-run-command nil env "update-index" "--add" "--" (git-get-filenames added)))
 638     (when deleted
 639       (apply #'git-run-command nil env "update-index" "--remove" "--" (git-get-filenames deleted)))
 640     (when modified
 641       (apply #'git-run-command nil env "update-index" "--" (git-get-filenames modified)))))
 642
 643 (defun git-run-pre-commit-hook ()
 644   "Run the pre-commit hook if any."
 645   (unless git-status (error "Not in git-status buffer."))
 646   (let ((files (git-marked-files-state 'added 'deleted 'modified)))
 647     (or (not files)
 648         (not (file-executable-p ".git/hooks/pre-commit"))
 649         (let ((index-file (make-temp-file "gitidx")))
 650           (unwind-protect
 651             (let ((head-tree (unless (git-empty-db-p) (git-rev-parse "HEAD^{tree}"))))
 652               (git-read-tree head-tree index-file)
 653               (git-update-index index-file files)
 654               (git-run-hook "pre-commit" `(("GIT_INDEX_FILE" . ,index-file))))
 655           (delete-file index-file))))))
 656
 657 (defun git-do-commit ()
 658   "Perform the actual commit using the current buffer as log message."
 659   (interactive)
 660   (let ((buffer (current-buffer))
 661         (index-file (make-temp-file "gitidx")))
 662     (with-current-buffer log-edit-parent-buffer
 663       (if (git-marked-files-state 'unmerged)
 664           (message "You cannot commit unmerged files, resolve them first.")
 665         (unwind-protect
 666             (let ((files (git-marked-files-state 'added 'deleted 'modified))
 667                   head head-tree)
 668               (unless (git-empty-db-p)
 669                 (setq head (git-rev-parse "HEAD")
 670                       head-tree (git-rev-parse "HEAD^{tree}")))
 671               (if files
 672                   (progn
 673                     (git-read-tree head-tree index-file)
 674                     (git-update-index nil files)         ;update both the default index
 675                     (git-update-index index-file files)  ;and the temporary one
 676                     (let ((tree (git-write-tree index-file)))
 677                       (if (or (not (string-equal tree head-tree))
 678                               (yes-or-no-p "The tree was not modified, do you really want to perform an empty commit? "))
 679                           (let ((commit (git-commit-tree buffer tree head)))
 680                             (condition-case nil (delete-file ".git/MERGE_HEAD") (error nil))
 681                             (condition-case nil (delete-file ".git/MERGE_MSG") (error nil))
 682                             (with-current-buffer buffer (erase-buffer))
 683                             (git-set-files-state files 'uptodate)
 684                             (git-run-command nil nil "rerere")
 685                             (git-refresh-files)
 686                             (git-refresh-ewoc-hf git-status)
 687                             (message "Committed %s." commit)
 688                             (git-run-hook "post-commit" nil))
 689                         (message "Commit aborted."))))
 690                 (message "No files to commit.")))
 691           (delete-file index-file))))))
 692
 693
 694 ;;;; Interactive functions
 695 ;;;; ------------------------------------------------------------
 696
 697 (defun git-mark-file ()
 698   "Mark the file that the cursor is on and move to the next one."
 699   (interactive)
 700   (unless git-status (error "Not in git-status buffer."))
 701   (let* ((pos (ewoc-locate git-status))
 702          (info (ewoc-data pos)))
 703     (setf (git-fileinfo->marked info) t)
 704     (ewoc-invalidate git-status pos)
 705     (ewoc-goto-next git-status 1)))
 706
 707 (defun git-unmark-file ()
 708   "Unmark the file that the cursor is on and move to the next one."
 709   (interactive)
 710   (unless git-status (error "Not in git-status buffer."))
 711   (let* ((pos (ewoc-locate git-status))
 712          (info (ewoc-data pos)))
 713     (setf (git-fileinfo->marked info) nil)
 714     (ewoc-invalidate git-status pos)
 715     (ewoc-goto-next git-status 1)))
 716
 717 (defun git-unmark-file-up ()
 718   "Unmark the file that the cursor is on and move to the previous one."
 719   (interactive)
 720   (unless git-status (error "Not in git-status buffer."))
 721   (let* ((pos (ewoc-locate git-status))
 722          (info (ewoc-data pos)))
 723     (setf (git-fileinfo->marked info) nil)
 724     (ewoc-invalidate git-status pos)
 725     (ewoc-goto-prev git-status 1)))
 726
 727 (defun git-mark-all ()
 728   "Mark all files."
 729   (interactive)
 730   (unless git-status (error "Not in git-status buffer."))
 731   (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) t) t) git-status)
 732   ; move back to goal column after invalidate
 733   (when goal-column (move-to-column goal-column)))
 734
 735 (defun git-unmark-all ()
 736   "Unmark all files."
 737   (interactive)
 738   (unless git-status (error "Not in git-status buffer."))
 739   (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) nil) t) git-status)
 740   ; move back to goal column after invalidate
 741   (when goal-column (move-to-column goal-column)))
 742
 743 (defun git-toggle-all-marks ()
 744   "Toggle all file marks."
 745   (interactive)
 746   (unless git-status (error "Not in git-status buffer."))
 747   (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) (not (git-fileinfo->marked info))) t) git-status)
 748   ; move back to goal column after invalidate
 749   (when goal-column (move-to-column goal-column)))
 750
 751 (defun git-next-file (&optional n)
 752   "Move the selection down N files."
 753   (interactive "p")
 754   (unless git-status (error "Not in git-status buffer."))
 755   (ewoc-goto-next git-status n))
 756
 757 (defun git-prev-file (&optional n)
 758   "Move the selection up N files."
 759   (interactive "p")
 760   (unless git-status (error "Not in git-status buffer."))
 761   (ewoc-goto-prev git-status n))
 762
 763 (defun git-next-unmerged-file (&optional n)
 764   "Move the selection down N unmerged files."
 765   (interactive "p")
 766   (unless git-status (error "Not in git-status buffer."))
 767   (let* ((last (ewoc-locate git-status))
 768          (node (ewoc-next git-status last)))
 769     (while (and node (> n 0))
 770       (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
 771         (setq n (1- n))
 772         (setq last node))
 773       (setq node (ewoc-next git-status node)))
 774     (ewoc-goto-node git-status last)))
 775
 776 (defun git-prev-unmerged-file (&optional n)
 777   "Move the selection up N unmerged files."
 778   (interactive "p")
 779   (unless git-status (error "Not in git-status buffer."))
 780   (let* ((last (ewoc-locate git-status))
 781          (node (ewoc-prev git-status last)))
 782     (while (and node (> n 0))
 783       (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
 784         (setq n (1- n))
 785         (setq last node))
 786       (setq node (ewoc-prev git-status node)))
 787     (ewoc-goto-node git-status last)))
 788
 789 (defun git-add-file ()
 790   "Add marked file(s) to the index cache."
 791   (interactive)
 792   (let ((files (git-marked-files-state 'unknown)))
 793     (unless files
 794       (push (ewoc-data
 795              (git-add-status-file 'added (file-relative-name
 796                                           (read-file-name "File to add: " nil nil t))))
 797             files))
 798     (apply #'git-run-command nil nil "update-index" "--info-only" "--add" "--" (git-get-filenames files))
 799     (git-set-files-state files 'added)
 800     (git-refresh-files)))
 801
 802 (defun git-ignore-file ()
 803   "Add marked file(s) to the ignore list."
 804   (interactive)
 805   (let ((files (git-marked-files-state 'unknown)))
 806     (unless files
 807       (push (ewoc-data
 808              (git-add-status-file 'unknown (file-relative-name
 809                                             (read-file-name "File to ignore: " nil nil t))))
 810             files))
 811     (dolist (info files) (git-append-to-ignore (git-fileinfo->name info)))
 812     (git-set-files-state files 'ignored)
 813     (git-refresh-files)))
 814
 815 (defun git-remove-file ()
 816   "Remove the marked file(s)."
 817   (interactive)
 818   (let ((files (git-marked-files-state 'added 'modified 'unknown 'uptodate)))
 819     (unless files
 820       (push (ewoc-data
 821              (git-add-status-file 'unknown (file-relative-name
 822                                             (read-file-name "File to remove: " nil nil t))))
 823             files))
 824     (if (yes-or-no-p
 825          (format "Remove %d file%s? " (length files) (if (> (length files) 1) "s" "")))
 826         (progn
 827           (dolist (info files)
 828             (let ((name (git-fileinfo->name info)))
 829               (when (file-exists-p name) (delete-file name))))
 830           (apply #'git-run-command nil nil "update-index" "--info-only" "--remove" "--" (git-get-filenames files))
 831           ; remove unknown files from the list, set the others to deleted
 832           (ewoc-filter git-status
 833                        (lambda (info files)
 834                          (not (and (memq info files) (eq (git-fileinfo->state info) 'unknown))))
 835                        files)
 836           (git-set-files-state files 'deleted)
 837           (git-refresh-files)
 838           (unless (ewoc-nth git-status 0)  ; refresh header if list is empty
 839             (git-refresh-ewoc-hf git-status)))
 840       (message "Aborting"))))
 841
 842 (defun git-revert-file ()
 843   "Revert changes to the marked file(s)."
 844   (interactive)
 845   (let ((files (git-marked-files))
 846         added modified)
 847     (when (and files
 848                (yes-or-no-p
 849                 (format "Revert %d file%s? " (length files) (if (> (length files) 1) "s" ""))))
 850       (dolist (info files)
 851         (case (git-fileinfo->state info)
 852           ('added (push info added))
 853           ('deleted (push info modified))
 854           ('unmerged (push info modified))
 855           ('modified (push info modified))))
 856       (when added
 857           (apply #'git-run-command nil nil "update-index" "--force-remove" "--" (git-get-filenames added))
 858           (git-set-files-state added 'unknown))
 859       (when modified
 860           (apply #'git-run-command nil nil "checkout" "HEAD" (git-get-filenames modified))
 861           (git-set-files-state modified 'uptodate))
 862       (git-refresh-files))))
 863
 864 (defun git-resolve-file ()
 865   "Resolve conflicts in marked file(s)."
 866   (interactive)
 867   (let ((files (git-marked-files-state 'unmerged)))
 868     (when files
 869       (apply #'git-run-command nil nil "update-index" "--" (git-get-filenames files))
 870       (git-set-files-state files 'modified)
 871       (git-refresh-files))))
 872
 873 (defun git-remove-handled ()
 874   "Remove handled files from the status list."
 875   (interactive)
 876   (ewoc-filter git-status
 877                (lambda (info)
 878                  (not (or (eq (git-fileinfo->state info) 'ignored)
 879                           (eq (git-fileinfo->state info) 'uptodate)))))
 880   (unless (ewoc-nth git-status 0)  ; refresh header if list is empty
 881     (git-refresh-ewoc-hf git-status)))
 882
 883 (defun git-setup-diff-buffer (buffer)
 884   "Setup a buffer for displaying a diff."
 885   (with-current-buffer buffer
 886     (diff-mode)
 887     (goto-char (point-min))
 888     (setq buffer-read-only t))
 889   (display-buffer buffer)
 890   (shrink-window-if-larger-than-buffer))
 891
 892 (defun git-diff-file ()
 893   "Diff the marked file(s) against HEAD."
 894   (interactive)
 895   (let ((files (git-marked-files)))
 896     (git-setup-diff-buffer
 897      (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M" "HEAD" "--" (git-get-filenames files)))))
 898
 899 (defun git-diff-file-merge-head (arg)
 900   "Diff the marked file(s) against the first merge head (or the nth one with a numeric prefix)."
 901   (interactive "p")
 902   (let ((files (git-marked-files))
 903         (merge-heads (git-get-merge-heads)))
 904     (unless merge-heads (error "No merge in progress"))
 905     (git-setup-diff-buffer
 906      (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M"
 907             (or (nth (1- arg) merge-heads) "HEAD") "--" (git-get-filenames files)))))
 908
 909 (defun git-diff-unmerged-file (stage)
 910   "Diff the marked unmerged file(s) against the specified stage."
 911   (let ((files (git-marked-files)))
 912     (git-setup-diff-buffer
 913      (apply #'git-run-command-buffer "*git-diff*" "diff-files" "-p" stage "--" (git-get-filenames files)))))
 914
 915 (defun git-diff-file-base ()
 916   "Diff the marked unmerged file(s) against the common base file."
 917   (interactive)
 918   (git-diff-unmerged-file "-1"))
 919
 920 (defun git-diff-file-mine ()
 921   "Diff the marked unmerged file(s) against my pre-merge version."
 922   (interactive)
 923   (git-diff-unmerged-file "-2"))
 924
 925 (defun git-diff-file-other ()
 926   "Diff the marked unmerged file(s) against the other's pre-merge version."
 927   (interactive)
 928   (git-diff-unmerged-file "-3"))
 929
 930 (defun git-diff-file-combined ()
 931   "Do a combined diff of the marked unmerged file(s)."
 932   (interactive)
 933   (git-diff-unmerged-file "-c"))
 934
 935 (defun git-diff-file-idiff ()
 936   "Perform an interactive diff on the current file."
 937   (interactive)
 938   (error "Interactive diffs not implemented yet."))
 939
 940 (defun git-log-file ()
 941   "Display a log of changes to the marked file(s)."
 942   (interactive)
 943   (let* ((files (git-marked-files))
 944          (coding-system-for-read git-commits-coding-system)
 945          (buffer (apply #'git-run-command-buffer "*git-log*" "rev-list" "--pretty" "HEAD" "--" (git-get-filenames files))))
 946     (with-current-buffer buffer
 947       ; (git-log-mode)  FIXME: implement log mode
 948       (goto-char (point-min))
 949       (setq buffer-read-only t))
 950     (display-buffer buffer)))
 951
 952 (defun git-log-edit-files ()
 953   "Return a list of marked files for use in the log-edit buffer."
 954   (with-current-buffer log-edit-parent-buffer
 955     (git-get-filenames (git-marked-files-state 'added 'deleted 'modified))))
 956
 957 (defun git-append-sign-off (name email)
 958   "Append a Signed-off-by entry to the current buffer, avoiding duplicates."
 959   (let ((sign-off (format "Signed-off-by: %s <%s>" name email))
 960         (case-fold-search t))
 961     (goto-char (point-min))
 962     (unless (re-search-forward (concat "^" (regexp-quote sign-off)) nil t)
 963       (goto-char (point-min))
 964       (unless (re-search-forward "^Signed-off-by: " nil t)
 965         (setq sign-off (concat "\n" sign-off)))
 966       (goto-char (point-max))
 967       (insert sign-off "\n"))))
 968
 969 (defun git-setup-log-buffer (buffer &optional author-name author-email subject date msg)
 970   "Setup the log buffer for a commit."
 971   (unless git-status (error "Not in git-status buffer."))
 972   (let ((merge-heads (git-get-merge-heads))
 973         (dir default-directory)
 974         (committer-name (git-get-committer-name))
 975         (committer-email (git-get-committer-email))
 976         (sign-off git-append-signed-off-by))
 977     (with-current-buffer buffer
 978       (cd dir)
 979       (erase-buffer)
 980       (insert
 981        (propertize
 982         (format "Author: %s <%s>\n%s%s"
 983                 (or author-name committer-name)
 984                 (or author-email committer-email)
 985                 (if date (format "Date: %s\n" date) "")
 986                 (if merge-heads
 987                     (format "Parent: %s\n%s\n"
 988                             (git-rev-parse "HEAD")
 989                             (mapconcat (lambda (str) (concat "Parent: " str)) merge-heads "\n"))
 990                   ""))
 991         'face 'git-header-face)
 992        (propertize git-log-msg-separator 'face 'git-separator-face)
 993        "\n")
 994       (when subject (insert subject "\n\n"))
 995       (cond (msg (insert msg "\n"))
 996             ((file-readable-p ".dotest/msg")
 997              (insert-file-contents ".dotest/msg"))
 998             ((file-readable-p ".git/MERGE_MSG")
 999              (insert-file-contents ".git/MERGE_MSG")))
1000       ; delete empty lines at end
1001       (goto-char (point-min))
1002       (when (re-search-forward "\n+\\'" nil t)
1003         (replace-match "\n" t t))
1004       (when sign-off (git-append-sign-off committer-name committer-email)))))
1005
1006 (defun git-commit-file ()
1007   "Commit the marked file(s), asking for a commit message."
1008   (interactive)
1009   (unless git-status (error "Not in git-status buffer."))
1010   (when (git-run-pre-commit-hook)
1011     (let ((buffer (get-buffer-create "*git-commit*"))
1012           (coding-system (git-get-commits-coding-system))
1013           author-name author-email subject date)
1014       (when (eq 0 (buffer-size buffer))
1015         (when (file-readable-p ".dotest/info")
1016           (with-temp-buffer
1017             (insert-file-contents ".dotest/info")
1018             (goto-char (point-min))
1019             (when (re-search-forward "^Author: \\(.*\\)\nEmail: \\(.*\\)$" nil t)
1020               (setq author-name (match-string 1))
1021               (setq author-email (match-string 2)))
1022             (goto-char (point-min))
1023             (when (re-search-forward "^Subject: \\(.*\\)$" nil t)
1024               (setq subject (match-string 1)))
1025             (goto-char (point-min))
1026             (when (re-search-forward "^Date: \\(.*\\)$" nil t)
1027               (setq date (match-string 1)))))
1028         (git-setup-log-buffer buffer author-name author-email subject date))
1029       (log-edit #'git-do-commit nil #'git-log-edit-files buffer)
1030       (setq font-lock-keywords (font-lock-compile-keywords git-log-edit-font-lock-keywords))
1031       (setq buffer-file-coding-system coding-system)
1032       (re-search-forward (regexp-quote (concat git-log-msg-separator "\n")) nil t))))
1033
1034 (defun git-find-file ()
1035   "Visit the current file in its own buffer."
1036   (interactive)
1037   (unless git-status (error "Not in git-status buffer."))
1038   (let ((info (ewoc-data (ewoc-locate git-status))))
1039     (find-file (git-fileinfo->name info))
1040     (when (eq 'unmerged (git-fileinfo->state info))
1041       (smerge-mode))))
1042
1043 (defun git-find-file-other-window ()
1044   "Visit the current file in its own buffer in another window."
1045   (interactive)
1046   (unless git-status (error "Not in git-status buffer."))
1047   (let ((info (ewoc-data (ewoc-locate git-status))))
1048     (find-file-other-window (git-fileinfo->name info))
1049     (when (eq 'unmerged (git-fileinfo->state info))
1050       (smerge-mode))))
1051
1052 (defun git-find-file-imerge ()
1053   "Visit the current file in interactive merge mode."
1054   (interactive)
1055   (unless git-status (error "Not in git-status buffer."))
1056   (let ((info (ewoc-data (ewoc-locate git-status))))
1057     (find-file (git-fileinfo->name info))
1058     (smerge-ediff)))
1059
1060 (defun git-view-file ()
1061   "View the current file in its own buffer."
1062   (interactive)
1063   (unless git-status (error "Not in git-status buffer."))
1064   (let ((info (ewoc-data (ewoc-locate git-status))))
1065     (view-file (git-fileinfo->name info))))
1066
1067 (defun git-refresh-status ()
1068   "Refresh the git status buffer."
1069   (interactive)
1070   (let* ((status git-status)
1071          (pos (ewoc-locate status))
1072          (cur-name (and pos (git-fileinfo->name (ewoc-data pos)))))
1073     (unless status (error "Not in git-status buffer."))
1074     (git-clear-status status)
1075     (git-run-command nil nil "update-index" "--info-only" "--refresh")
1076     (if (git-empty-db-p)
1077         ; we need some special handling for an empty db
1078         (with-temp-buffer
1079           (git-run-command t nil "ls-files" "-z" "-t" "-c")
1080           (git-parse-ls-files status 'added))
1081       (with-temp-buffer
1082         (git-run-command t nil "diff-index" "-z" "-M" "HEAD")
1083         (git-parse-status status)))
1084       (with-temp-buffer
1085         (git-run-command t nil "ls-files" "-z" "-u")
1086         (git-parse-ls-unmerged status))
1087       (when (file-readable-p ".git/info/exclude")
1088         (with-temp-buffer
1089           (git-run-command t nil "ls-files" "-z" "-t" "-o"
1090                            "--exclude-from=.git/info/exclude"
1091                            (concat "--exclude-per-directory=" git-per-dir-ignore-file))
1092           (git-parse-ls-files status 'unknown)))
1093     (git-refresh-files)
1094     (git-refresh-ewoc-hf status)
1095     ; move point to the current file name if any
1096     (let ((node (and cur-name (git-find-status-file status cur-name))))
1097       (when node (ewoc-goto-node status node)))))
1098
1099 (defun git-status-quit ()
1100   "Quit git-status mode."
1101   (interactive)
1102   (bury-buffer))
1103
1104 ;;;; Major Mode
1105 ;;;; ------------------------------------------------------------
1106
1107 (defvar git-status-mode-hook nil
1108   "Run after `git-status-mode' is setup.")
1109
1110 (defvar git-status-mode-map nil
1111   "Keymap for git major mode.")
1112
1113 (defvar git-status nil
1114   "List of all files managed by the git-status mode.")
1115
1116 (unless git-status-mode-map
1117   (let ((map (make-keymap))
1118         (diff-map (make-sparse-keymap)))
1119     (suppress-keymap map)
1120     (define-key map "?"   'git-help)
1121     (define-key map "h"   'git-help)
1122     (define-key map " "   'git-next-file)
1123     (define-key map "a"   'git-add-file)
1124     (define-key map "c"   'git-commit-file)
1125     (define-key map "d"    diff-map)
1126     (define-key map "="   'git-diff-file)
1127     (define-key map "f"   'git-find-file)
1128     (define-key map "\r"  'git-find-file)
1129     (define-key map "g"   'git-refresh-status)
1130     (define-key map "i"   'git-ignore-file)
1131     (define-key map "l"   'git-log-file)
1132     (define-key map "m"   'git-mark-file)
1133     (define-key map "M"   'git-mark-all)
1134     (define-key map "n"   'git-next-file)
1135     (define-key map "N"   'git-next-unmerged-file)
1136     (define-key map "o"   'git-find-file-other-window)
1137     (define-key map "p"   'git-prev-file)
1138     (define-key map "P"   'git-prev-unmerged-file)
1139     (define-key map "q"   'git-status-quit)
1140     (define-key map "r"   'git-remove-file)
1141     (define-key map "R"   'git-resolve-file)
1142     (define-key map "T"   'git-toggle-all-marks)
1143     (define-key map "u"   'git-unmark-file)
1144     (define-key map "U"   'git-revert-file)
1145     (define-key map "v"   'git-view-file)
1146     (define-key map "x"   'git-remove-handled)
1147     (define-key map "\C-?" 'git-unmark-file-up)
1148     (define-key map "\M-\C-?" 'git-unmark-all)
1149     ; the diff submap
1150     (define-key diff-map "b" 'git-diff-file-base)
1151     (define-key diff-map "c" 'git-diff-file-combined)
1152     (define-key diff-map "=" 'git-diff-file)
1153     (define-key diff-map "e" 'git-diff-file-idiff)
1154     (define-key diff-map "E" 'git-find-file-imerge)
1155     (define-key diff-map "h" 'git-diff-file-merge-head)
1156     (define-key diff-map "m" 'git-diff-file-mine)
1157     (define-key diff-map "o" 'git-diff-file-other)
1158     (setq git-status-mode-map map)))
1159
1160 ;; git mode should only run in the *git status* buffer
1161 (put 'git-status-mode 'mode-class 'special)
1162
1163 (defun git-status-mode ()
1164   "Major mode for interacting with Git.
1165 Commands:
1166 \\{git-status-mode-map}"
1167   (kill-all-local-variables)
1168   (buffer-disable-undo)
1169   (setq mode-name "git status"
1170         major-mode 'git-status-mode
1171         goal-column 17
1172         buffer-read-only t)
1173   (use-local-map git-status-mode-map)
1174   (let ((buffer-read-only nil))
1175     (erase-buffer)
1176   (let ((status (ewoc-create 'git-fileinfo-prettyprint "" "")))
1177     (set (make-local-variable 'git-status) status))
1178   (set (make-local-variable 'list-buffers-directory) default-directory)
1179   (run-hooks 'git-status-mode-hook)))
1180
1181 (defun git-find-status-buffer (dir)
1182   "Find the git status buffer handling a specified directory."
1183   (let ((list (buffer-list))
1184         (fulldir (expand-file-name dir))
1185         found)
1186     (while (and list (not found))
1187       (let ((buffer (car list)))
1188         (with-current-buffer buffer
1189           (when (and list-buffers-directory
1190                      (string-equal fulldir (expand-file-name list-buffers-directory))
1191                      (string-match "\\*git-status\\*$" (buffer-name buffer)))
1192             (setq found buffer))))
1193       (setq list (cdr list)))
1194     found))
1195
1196 (defun git-status (dir)
1197   "Entry point into git-status mode."
1198   (interactive "DSelect directory: ")
1199   (setq dir (git-get-top-dir dir))
1200   (if (file-directory-p (concat (file-name-as-directory dir) ".git"))
1201       (let ((buffer (or (and git-reuse-status-buffer (git-find-status-buffer dir))
1202                         (create-file-buffer (expand-file-name "*git-status*" dir)))))
1203         (switch-to-buffer buffer)
1204         (cd dir)
1205         (git-status-mode)
1206         (git-refresh-status)
1207         (goto-char (point-min)))
1208     (message "%s is not a git working tree." dir)))
1209
1210 (defun git-help ()
1211   "Display help for Git mode."
1212   (interactive)
1213   (describe-function 'git-status-mode))
1214
1215 (provide 'git)
1216 ;;; git.el ends here