Andrew's git / gitweb.git / contrib/emacs/git.el
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contrib / emacs / git.elon commit git.el: Add some notes about Emacs versions compatibility. (5a7b3bf)
   1;;; git.el --- A user interface for git
   2
   3;; Copyright (C) 2005, 2006, 2007, 2008, 2009 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;;  - diff against other branch
  38;;  - renaming files from the status buffer
  39;;  - creating tags
  40;;  - fetch/pull
  41;;  - revlist browser
  42;;  - git-show-branch browser
  43;;
  44
  45;;; Compatibility:
  46;;
  47;; This file works on GNU Emacs 21 or later. It may work on older
  48;; versions but this is not guaranteed.
  49;;
  50;; It may work on XEmacs 21, provided that you first install the ewoc
  51;; and log-edit packages.
  52;;
  53
  54(eval-when-compile (require 'cl))
  55(require 'ewoc)
  56(require 'log-edit)
  57(require 'easymenu)
  58
  59
  60;;;; Customizations
  61;;;; ------------------------------------------------------------
  62
  63(defgroup git nil
  64  "A user interface for the git versioning system."
  65  :group 'tools)
  66
  67(defcustom git-committer-name nil
  68  "User name to use for commits.
  69The default is to fall back to the repository config,
  70then to `add-log-full-name' and then to `user-full-name'."
  71  :group 'git
  72  :type '(choice (const :tag "Default" nil)
  73                 (string :tag "Name")))
  74
  75(defcustom git-committer-email nil
  76  "Email address to use for commits.
  77The default is to fall back to the git repository config,
  78then to `add-log-mailing-address' and then to `user-mail-address'."
  79  :group 'git
  80  :type '(choice (const :tag "Default" nil)
  81                 (string :tag "Email")))
  82
  83(defcustom git-commits-coding-system nil
  84  "Default coding system for the log message of git commits."
  85  :group 'git
  86  :type '(choice (const :tag "From repository config" nil)
  87                 (coding-system)))
  88
  89(defcustom git-append-signed-off-by nil
  90  "Whether to append a Signed-off-by line to the commit message before editing."
  91  :group 'git
  92  :type 'boolean)
  93
  94(defcustom git-reuse-status-buffer t
  95  "Whether `git-status' should try to reuse an existing buffer
  96if there is already one that displays the same directory."
  97  :group 'git
  98  :type 'boolean)
  99
 100(defcustom git-per-dir-ignore-file ".gitignore"
 101  "Name of the per-directory ignore file."
 102  :group 'git
 103  :type 'string)
 104
 105(defcustom git-show-uptodate nil
 106  "Whether to display up-to-date files."
 107  :group 'git
 108  :type 'boolean)
 109
 110(defcustom git-show-ignored nil
 111  "Whether to display ignored files."
 112  :group 'git
 113  :type 'boolean)
 114
 115(defcustom git-show-unknown t
 116  "Whether to display unknown files."
 117  :group 'git
 118  :type 'boolean)
 119
 120
 121(defface git-status-face
 122  '((((class color) (background light)) (:foreground "purple"))
 123    (((class color) (background dark)) (:foreground "salmon")))
 124  "Git mode face used to highlight added and modified files."
 125  :group 'git)
 126
 127(defface git-unmerged-face
 128  '((((class color) (background light)) (:foreground "red" :bold t))
 129    (((class color) (background dark)) (:foreground "red" :bold t)))
 130  "Git mode face used to highlight unmerged files."
 131  :group 'git)
 132
 133(defface git-unknown-face
 134  '((((class color) (background light)) (:foreground "goldenrod" :bold t))
 135    (((class color) (background dark)) (:foreground "goldenrod" :bold t)))
 136  "Git mode face used to highlight unknown files."
 137  :group 'git)
 138
 139(defface git-uptodate-face
 140  '((((class color) (background light)) (:foreground "grey60"))
 141    (((class color) (background dark)) (:foreground "grey40")))
 142  "Git mode face used to highlight up-to-date files."
 143  :group 'git)
 144
 145(defface git-ignored-face
 146  '((((class color) (background light)) (:foreground "grey60"))
 147    (((class color) (background dark)) (:foreground "grey40")))
 148  "Git mode face used to highlight ignored files."
 149  :group 'git)
 150
 151(defface git-mark-face
 152  '((((class color) (background light)) (:foreground "red" :bold t))
 153    (((class color) (background dark)) (:foreground "tomato" :bold t)))
 154  "Git mode face used for the file marks."
 155  :group 'git)
 156
 157(defface git-header-face
 158  '((((class color) (background light)) (:foreground "blue"))
 159    (((class color) (background dark)) (:foreground "blue")))
 160  "Git mode face used for commit headers."
 161  :group 'git)
 162
 163(defface git-separator-face
 164  '((((class color) (background light)) (:foreground "brown"))
 165    (((class color) (background dark)) (:foreground "brown")))
 166  "Git mode face used for commit separator."
 167  :group 'git)
 168
 169(defface git-permission-face
 170  '((((class color) (background light)) (:foreground "green" :bold t))
 171    (((class color) (background dark)) (:foreground "green" :bold t)))
 172  "Git mode face used for permission changes."
 173  :group 'git)
 174
 175
 176;;;; Utilities
 177;;;; ------------------------------------------------------------
 178
 179(defconst git-log-msg-separator "--- log message follows this line ---")
 180
 181(defvar git-log-edit-font-lock-keywords
 182  `(("^\\(Author:\\|Date:\\|Merge:\\|Signed-off-by:\\)\\(.*\\)$"
 183     (1 font-lock-keyword-face)
 184     (2 font-lock-function-name-face))
 185    (,(concat "^\\(" (regexp-quote git-log-msg-separator) "\\)$")
 186     (1 font-lock-comment-face))))
 187
 188(defun git-get-env-strings (env)
 189  "Build a list of NAME=VALUE strings from a list of environment strings."
 190  (mapcar (lambda (entry) (concat (car entry) "=" (cdr entry))) env))
 191
 192(defun git-call-process (buffer &rest args)
 193  "Wrapper for call-process that sets environment strings."
 194  (apply #'call-process "git" nil buffer nil args))
 195
 196(defun git-call-process-display-error (&rest args)
 197  "Wrapper for call-process that displays error messages."
 198  (let* ((dir default-directory)
 199         (buffer (get-buffer-create "*Git Command Output*"))
 200         (ok (with-current-buffer buffer
 201               (let ((default-directory dir)
 202                     (buffer-read-only nil))
 203                 (erase-buffer)
 204                 (eq 0 (apply #'git-call-process (list buffer t) args))))))
 205    (unless ok (display-message-or-buffer buffer))
 206    ok))
 207
 208(defun git-call-process-string (&rest args)
 209  "Wrapper for call-process that returns the process output as a string,
 210or nil if the git command failed."
 211  (with-temp-buffer
 212    (and (eq 0 (apply #'git-call-process t args))
 213         (buffer-string))))
 214
 215(defun git-call-process-string-display-error (&rest args)
 216  "Wrapper for call-process that displays error message and returns
 217the process output as a string, or nil if the git command failed."
 218  (with-temp-buffer
 219    (if (eq 0 (apply #'git-call-process (list t t) args))
 220        (buffer-string)
 221      (display-message-or-buffer (current-buffer))
 222      nil)))
 223
 224(defun git-run-process-region (buffer start end program args)
 225  "Run a git process with a buffer region as input."
 226  (let ((output-buffer (current-buffer))
 227        (dir default-directory))
 228    (with-current-buffer buffer
 229      (cd dir)
 230      (apply #'call-process-region start end program
 231             nil (list output-buffer t) nil args))))
 232
 233(defun git-run-command-buffer (buffer-name &rest args)
 234  "Run a git command, sending the output to a buffer named BUFFER-NAME."
 235  (let ((dir default-directory)
 236        (buffer (get-buffer-create buffer-name)))
 237    (message "Running git %s..." (car args))
 238    (with-current-buffer buffer
 239      (let ((default-directory dir)
 240            (buffer-read-only nil))
 241        (erase-buffer)
 242        (apply #'git-call-process buffer args)))
 243    (message "Running git %s...done" (car args))
 244    buffer))
 245
 246(defun git-run-command-region (buffer start end env &rest args)
 247  "Run a git command with specified buffer region as input."
 248  (with-temp-buffer
 249    (if (eq 0 (if env
 250                  (git-run-process-region
 251                   buffer start end "env"
 252                   (append (git-get-env-strings env) (list "git") args))
 253                (git-run-process-region buffer start end "git" args)))
 254        (buffer-string)
 255      (display-message-or-buffer (current-buffer))
 256      nil)))
 257
 258(defun git-run-hook (hook env &rest args)
 259  "Run a git hook and display its output if any."
 260  (let ((dir default-directory)
 261        (hook-name (expand-file-name (concat ".git/hooks/" hook))))
 262    (or (not (file-executable-p hook-name))
 263        (let (status (buffer (get-buffer-create "*Git Hook Output*")))
 264          (with-current-buffer buffer
 265            (erase-buffer)
 266            (cd dir)
 267            (setq status
 268                  (if env
 269                      (apply #'call-process "env" nil (list buffer t) nil
 270                             (append (git-get-env-strings env) (list hook-name) args))
 271                    (apply #'call-process hook-name nil (list buffer t) nil args))))
 272          (display-message-or-buffer buffer)
 273          (eq 0 status)))))
 274
 275(defun git-get-string-sha1 (string)
 276  "Read a SHA1 from the specified string."
 277  (and string
 278       (string-match "[0-9a-f]\\{40\\}" string)
 279       (match-string 0 string)))
 280
 281(defun git-get-committer-name ()
 282  "Return the name to use as GIT_COMMITTER_NAME."
 283  ; copied from log-edit
 284  (or git-committer-name
 285      (git-config "user.name")
 286      (and (boundp 'add-log-full-name) add-log-full-name)
 287      (and (fboundp 'user-full-name) (user-full-name))
 288      (and (boundp 'user-full-name) user-full-name)))
 289
 290(defun git-get-committer-email ()
 291  "Return the email address to use as GIT_COMMITTER_EMAIL."
 292  ; copied from log-edit
 293  (or git-committer-email
 294      (git-config "user.email")
 295      (and (boundp 'add-log-mailing-address) add-log-mailing-address)
 296      (and (fboundp 'user-mail-address) (user-mail-address))
 297      (and (boundp 'user-mail-address) user-mail-address)))
 298
 299(defun git-get-commits-coding-system ()
 300  "Return the coding system to use for commits."
 301  (let ((repo-config (git-config "i18n.commitencoding")))
 302    (or git-commits-coding-system
 303        (and repo-config
 304             (fboundp 'locale-charset-to-coding-system)
 305             (locale-charset-to-coding-system repo-config))
 306      'utf-8)))
 307
 308(defun git-get-logoutput-coding-system ()
 309  "Return the coding system used for git-log output."
 310  (let ((repo-config (or (git-config "i18n.logoutputencoding")
 311                         (git-config "i18n.commitencoding"))))
 312    (or git-commits-coding-system
 313        (and repo-config
 314             (fboundp 'locale-charset-to-coding-system)
 315             (locale-charset-to-coding-system repo-config))
 316      'utf-8)))
 317
 318(defun git-escape-file-name (name)
 319  "Escape a file name if necessary."
 320  (if (string-match "[\n\t\"\\]" name)
 321      (concat "\""
 322              (mapconcat (lambda (c)
 323                   (case c
 324                     (?\n "\\n")
 325                     (?\t "\\t")
 326                     (?\\ "\\\\")
 327                     (?\" "\\\"")
 328                     (t (char-to-string c))))
 329                 name "")
 330              "\"")
 331    name))
 332
 333(defun git-success-message (text files)
 334  "Print a success message after having handled FILES."
 335  (let ((n (length files)))
 336    (if (equal n 1)
 337        (message "%s %s" text (car files))
 338      (message "%s %d files" text n))))
 339
 340(defun git-get-top-dir (dir)
 341  "Retrieve the top-level directory of a git tree."
 342  (let ((cdup (with-output-to-string
 343                (with-current-buffer standard-output
 344                  (cd dir)
 345                  (unless (eq 0 (git-call-process t "rev-parse" "--show-cdup"))
 346                    (error "cannot find top-level git tree for %s." dir))))))
 347    (expand-file-name (concat (file-name-as-directory dir)
 348                              (car (split-string cdup "\n"))))))
 349
 350;stolen from pcl-cvs
 351(defun git-append-to-ignore (file)
 352  "Add a file name to the ignore file in its directory."
 353  (let* ((fullname (expand-file-name file))
 354         (dir (file-name-directory fullname))
 355         (name (file-name-nondirectory fullname))
 356         (ignore-name (expand-file-name git-per-dir-ignore-file dir))
 357         (created (not (file-exists-p ignore-name))))
 358  (save-window-excursion
 359    (set-buffer (find-file-noselect ignore-name))
 360    (goto-char (point-max))
 361    (unless (zerop (current-column)) (insert "\n"))
 362    (insert "/" name "\n")
 363    (sort-lines nil (point-min) (point-max))
 364    (save-buffer))
 365  (when created
 366    (git-call-process nil "update-index" "--add" "--" (file-relative-name ignore-name)))
 367  (git-update-status-files (list (file-relative-name ignore-name)))))
 368
 369; propertize definition for XEmacs, stolen from erc-compat
 370(eval-when-compile
 371  (unless (fboundp 'propertize)
 372    (defun propertize (string &rest props)
 373      (let ((string (copy-sequence string)))
 374        (while props
 375          (put-text-property 0 (length string) (nth 0 props) (nth 1 props) string)
 376          (setq props (cddr props)))
 377        string))))
 378
 379;;;; Wrappers for basic git commands
 380;;;; ------------------------------------------------------------
 381
 382(defun git-rev-parse (rev)
 383  "Parse a revision name and return its SHA1."
 384  (git-get-string-sha1
 385   (git-call-process-string "rev-parse" rev)))
 386
 387(defun git-config (key)
 388  "Retrieve the value associated to KEY in the git repository config file."
 389  (let ((str (git-call-process-string "config" key)))
 390    (and str (car (split-string str "\n")))))
 391
 392(defun git-symbolic-ref (ref)
 393  "Wrapper for the git-symbolic-ref command."
 394  (let ((str (git-call-process-string "symbolic-ref" ref)))
 395    (and str (car (split-string str "\n")))))
 396
 397(defun git-update-ref (ref newval &optional oldval reason)
 398  "Update a reference by calling git-update-ref."
 399  (let ((args (and oldval (list oldval))))
 400    (when newval (push newval args))
 401    (push ref args)
 402    (when reason
 403     (push reason args)
 404     (push "-m" args))
 405    (unless newval (push "-d" args))
 406    (apply 'git-call-process-display-error "update-ref" args)))
 407
 408(defun git-for-each-ref (&rest specs)
 409  "Return a list of refs using git-for-each-ref.
 410Each entry is a cons of (SHORT-NAME . FULL-NAME)."
 411  (let (refs)
 412    (with-temp-buffer
 413      (apply #'git-call-process t "for-each-ref" "--format=%(refname)" specs)
 414      (goto-char (point-min))
 415      (while (re-search-forward "^[^/\n]+/[^/\n]+/\\(.+\\)$" nil t)
 416        (push (cons (match-string 1) (match-string 0)) refs)))
 417    (nreverse refs)))
 418
 419(defun git-read-tree (tree &optional index-file)
 420  "Read a tree into the index file."
 421  (let ((process-environment
 422         (append (and index-file (list (concat "GIT_INDEX_FILE=" index-file))) process-environment)))
 423    (apply 'git-call-process-display-error "read-tree" (if tree (list tree)))))
 424
 425(defun git-write-tree (&optional index-file)
 426  "Call git-write-tree and return the resulting tree SHA1 as a string."
 427  (let ((process-environment
 428         (append (and index-file (list (concat "GIT_INDEX_FILE=" index-file))) process-environment)))
 429    (git-get-string-sha1
 430     (git-call-process-string-display-error "write-tree"))))
 431
 432(defun git-commit-tree (buffer tree head)
 433  "Call git-commit-tree with buffer as input and return the resulting commit SHA1."
 434  (let ((author-name (git-get-committer-name))
 435        (author-email (git-get-committer-email))
 436        (subject "commit (initial): ")
 437        author-date log-start log-end args coding-system-for-write)
 438    (when head
 439      (setq subject "commit: ")
 440      (push "-p" args)
 441      (push head args))
 442    (with-current-buffer buffer
 443      (goto-char (point-min))
 444      (if
 445          (setq log-start (re-search-forward (concat "^" (regexp-quote git-log-msg-separator) "\n") nil t))
 446          (save-restriction
 447            (narrow-to-region (point-min) log-start)
 448            (goto-char (point-min))
 449            (when (re-search-forward "^Author: +\\(.*?\\) *<\\(.*\\)> *$" nil t)
 450              (setq author-name (match-string 1)
 451                    author-email (match-string 2)))
 452            (goto-char (point-min))
 453            (when (re-search-forward "^Date: +\\(.*\\)$" nil t)
 454              (setq author-date (match-string 1)))
 455            (goto-char (point-min))
 456            (when (re-search-forward "^Merge: +\\(.*\\)" nil t)
 457              (setq subject "commit (merge): ")
 458              (dolist (parent (split-string (match-string 1) " +" t))
 459                (push "-p" args)
 460                (push parent args))))
 461        (setq log-start (point-min)))
 462      (setq log-end (point-max))
 463      (goto-char log-start)
 464      (when (re-search-forward ".*$" nil t)
 465        (setq subject (concat subject (match-string 0))))
 466      (setq coding-system-for-write buffer-file-coding-system))
 467    (let ((commit
 468           (git-get-string-sha1
 469            (let ((env `(("GIT_AUTHOR_NAME" . ,author-name)
 470                         ("GIT_AUTHOR_EMAIL" . ,author-email)
 471                         ("GIT_COMMITTER_NAME" . ,(git-get-committer-name))
 472                         ("GIT_COMMITTER_EMAIL" . ,(git-get-committer-email)))))
 473              (when author-date (push `("GIT_AUTHOR_DATE" . ,author-date) env))
 474              (apply #'git-run-command-region
 475                     buffer log-start log-end env
 476                     "commit-tree" tree (nreverse args))))))
 477      (when commit (git-update-ref "HEAD" commit head subject))
 478      commit)))
 479
 480(defun git-empty-db-p ()
 481  "Check if the git db is empty (no commit done yet)."
 482  (not (eq 0 (git-call-process nil "rev-parse" "--verify" "HEAD"))))
 483
 484(defun git-get-merge-heads ()
 485  "Retrieve the merge heads from the MERGE_HEAD file if present."
 486  (let (heads)
 487    (when (file-readable-p ".git/MERGE_HEAD")
 488      (with-temp-buffer
 489        (insert-file-contents ".git/MERGE_HEAD" nil nil nil t)
 490        (goto-char (point-min))
 491        (while (re-search-forward "[0-9a-f]\\{40\\}" nil t)
 492          (push (match-string 0) heads))))
 493    (nreverse heads)))
 494
 495(defun git-get-commit-description (commit)
 496  "Get a one-line description of COMMIT."
 497  (let ((coding-system-for-read (git-get-logoutput-coding-system)))
 498    (let ((descr (git-call-process-string "log" "--max-count=1" "--pretty=oneline" commit)))
 499      (if (and descr (string-match "\\`\\([0-9a-f]\\{40\\}\\) *\\(.*\\)$" descr))
 500          (concat (substring (match-string 1 descr) 0 10) " - " (match-string 2 descr))
 501        descr))))
 502
 503;;;; File info structure
 504;;;; ------------------------------------------------------------
 505
 506; fileinfo structure stolen from pcl-cvs
 507(defstruct (git-fileinfo
 508            (:copier nil)
 509            (:constructor git-create-fileinfo (state name &optional old-perm new-perm rename-state orig-name marked))
 510            (:conc-name git-fileinfo->))
 511  marked              ;; t/nil
 512  state               ;; current state
 513  name                ;; file name
 514  old-perm new-perm   ;; permission flags
 515  rename-state        ;; rename or copy state
 516  orig-name           ;; original name for renames or copies
 517  needs-update        ;; whether file needs to be updated
 518  needs-refresh)      ;; whether file needs to be refreshed
 519
 520(defvar git-status nil)
 521
 522(defun git-set-fileinfo-state (info state)
 523  "Set the state of a file info."
 524  (unless (eq (git-fileinfo->state info) state)
 525    (setf (git-fileinfo->state info) state
 526          (git-fileinfo->new-perm info) (git-fileinfo->old-perm info)
 527          (git-fileinfo->rename-state info) nil
 528          (git-fileinfo->orig-name info) nil
 529          (git-fileinfo->needs-update info) nil
 530          (git-fileinfo->needs-refresh info) t)))
 531
 532(defun git-status-filenames-map (status func files &rest args)
 533  "Apply FUNC to the status files names in the FILES list."
 534  (when files
 535    (setq files (sort files #'string-lessp))
 536    (let ((file (pop files))
 537          (node (ewoc-nth status 0)))
 538      (while (and file node)
 539        (let* ((info (ewoc-data node))
 540               (name (git-fileinfo->name info)))
 541          (if (string-lessp name file)
 542              (setq node (ewoc-next status node))
 543            (if (string-equal name file)
 544                (apply func info args))
 545            (setq file (pop files))))))))
 546
 547(defun git-set-filenames-state (status files state)
 548  "Set the state of a list of named files."
 549  (when files
 550    (git-status-filenames-map status #'git-set-fileinfo-state files state)
 551    (unless state  ;; delete files whose state has been set to nil
 552      (ewoc-filter status (lambda (info) (git-fileinfo->state info))))))
 553
 554(defun git-state-code (code)
 555  "Convert from a string to a added/deleted/modified state."
 556  (case (string-to-char code)
 557    (?M 'modified)
 558    (?? 'unknown)
 559    (?A 'added)
 560    (?D 'deleted)
 561    (?U 'unmerged)
 562    (?T 'modified)
 563    (t nil)))
 564
 565(defun git-status-code-as-string (code)
 566  "Format a git status code as string."
 567  (case code
 568    ('modified (propertize "Modified" 'face 'git-status-face))
 569    ('unknown  (propertize "Unknown " 'face 'git-unknown-face))
 570    ('added    (propertize "Added   " 'face 'git-status-face))
 571    ('deleted  (propertize "Deleted " 'face 'git-status-face))
 572    ('unmerged (propertize "Unmerged" 'face 'git-unmerged-face))
 573    ('uptodate (propertize "Uptodate" 'face 'git-uptodate-face))
 574    ('ignored  (propertize "Ignored " 'face 'git-ignored-face))
 575    (t "?       ")))
 576
 577(defun git-file-type-as-string (old-perm new-perm)
 578  "Return a string describing the file type based on its permissions."
 579  (let* ((old-type (lsh (or old-perm 0) -9))
 580         (new-type (lsh (or new-perm 0) -9))
 581         (str (case new-type
 582                (64  ;; file
 583                 (case old-type
 584                   (64 nil)
 585                   (80 "   (type change symlink -> file)")
 586                   (112 "   (type change subproject -> file)")))
 587                 (80  ;; symlink
 588                  (case old-type
 589                    (64 "   (type change file -> symlink)")
 590                    (112 "   (type change subproject -> symlink)")
 591                    (t "   (symlink)")))
 592                  (112  ;; subproject
 593                   (case old-type
 594                     (64 "   (type change file -> subproject)")
 595                     (80 "   (type change symlink -> subproject)")
 596                     (t "   (subproject)")))
 597                  (72 nil)  ;; directory (internal, not a real git state)
 598                  (0  ;; deleted or unknown
 599                   (case old-type
 600                     (80 "   (symlink)")
 601                     (112 "   (subproject)")))
 602                  (t (format "   (unknown type %o)" new-type)))))
 603    (cond (str (propertize str 'face 'git-status-face))
 604          ((eq new-type 72) "/")
 605          (t ""))))
 606
 607(defun git-rename-as-string (info)
 608  "Return a string describing the copy or rename associated with INFO, or an empty string if none."
 609  (let ((state (git-fileinfo->rename-state info)))
 610    (if state
 611        (propertize
 612         (concat "   ("
 613                 (if (eq state 'copy) "copied from "
 614                   (if (eq (git-fileinfo->state info) 'added) "renamed from "
 615                     "renamed to "))
 616                 (git-escape-file-name (git-fileinfo->orig-name info))
 617                 ")") 'face 'git-status-face)
 618      "")))
 619
 620(defun git-permissions-as-string (old-perm new-perm)
 621  "Format a permission change as string."
 622  (propertize
 623   (if (or (not old-perm)
 624           (not new-perm)
 625           (eq 0 (logand ?\111 (logxor old-perm new-perm))))
 626       "  "
 627     (if (eq 0 (logand ?\111 old-perm)) "+x" "-x"))
 628  'face 'git-permission-face))
 629
 630(defun git-fileinfo-prettyprint (info)
 631  "Pretty-printer for the git-fileinfo structure."
 632  (let ((old-perm (git-fileinfo->old-perm info))
 633        (new-perm (git-fileinfo->new-perm info)))
 634    (insert (concat "   " (if (git-fileinfo->marked info) (propertize "*" 'face 'git-mark-face) " ")
 635                    " " (git-status-code-as-string (git-fileinfo->state info))
 636                    " " (git-permissions-as-string old-perm new-perm)
 637                    "  " (git-escape-file-name (git-fileinfo->name info))
 638                    (git-file-type-as-string old-perm new-perm)
 639                    (git-rename-as-string info)))))
 640
 641(defun git-update-node-fileinfo (node info)
 642  "Update the fileinfo of the specified node. The names are assumed to match already."
 643  (let ((data (ewoc-data node)))
 644    (setf
 645     ;; preserve the marked flag
 646     (git-fileinfo->marked info) (git-fileinfo->marked data)
 647     (git-fileinfo->needs-update data) nil)
 648    (when (not (equal info data))
 649      (setf (git-fileinfo->needs-refresh info) t
 650            (ewoc-data node) info))))
 651
 652(defun git-insert-info-list (status infolist files)
 653  "Insert a sorted list of file infos in the status buffer, replacing existing ones if any."
 654  (let* ((info (pop infolist))
 655         (node (ewoc-nth status 0))
 656         (name (and info (git-fileinfo->name info)))
 657         remaining)
 658    (while info
 659      (let ((nodename (and node (git-fileinfo->name (ewoc-data node)))))
 660        (while (and files (string-lessp (car files) name))
 661          (push (pop files) remaining))
 662        (when (and files (string-equal (car files) name))
 663          (setq files (cdr files)))
 664        (cond ((not nodename)
 665               (setq node (ewoc-enter-last status info))
 666               (setq info (pop infolist))
 667               (setq name (and info (git-fileinfo->name info))))
 668              ((string-lessp nodename name)
 669               (setq node (ewoc-next status node)))
 670              ((string-equal nodename name)
 671               ;; preserve the marked flag
 672               (git-update-node-fileinfo node info)
 673               (setq info (pop infolist))
 674               (setq name (and info (git-fileinfo->name info))))
 675              (t
 676               (setq node (ewoc-enter-before status node info))
 677               (setq info (pop infolist))
 678               (setq name (and info (git-fileinfo->name info)))))))
 679    (nconc (nreverse remaining) files)))
 680
 681(defun git-run-diff-index (status files)
 682  "Run git-diff-index on FILES and parse the results into STATUS.
 683Return the list of files that haven't been handled."
 684  (let (infolist)
 685    (with-temp-buffer
 686      (apply #'git-call-process t "diff-index" "-z" "-M" "HEAD" "--" files)
 687      (goto-char (point-min))
 688      (while (re-search-forward
 689              ":\\([0-7]\\{6\\}\\) \\([0-7]\\{6\\}\\) [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} \\(\\([ADMUT]\\)\0\\([^\0]+\\)\\|\\([CR]\\)[0-9]*\0\\([^\0]+\\)\0\\([^\0]+\\)\\)\0"
 690              nil t 1)
 691        (let ((old-perm (string-to-number (match-string 1) 8))
 692              (new-perm (string-to-number (match-string 2) 8))
 693              (state (or (match-string 4) (match-string 6)))
 694              (name (or (match-string 5) (match-string 7)))
 695              (new-name (match-string 8)))
 696          (if new-name  ; copy or rename
 697              (if (eq ?C (string-to-char state))
 698                  (push (git-create-fileinfo 'added new-name old-perm new-perm 'copy name) infolist)
 699                (push (git-create-fileinfo 'deleted name 0 0 'rename new-name) infolist)
 700                (push (git-create-fileinfo 'added new-name old-perm new-perm 'rename name) infolist))
 701            (push (git-create-fileinfo (git-state-code state) name old-perm new-perm) infolist)))))
 702    (setq infolist (sort (nreverse infolist)
 703                         (lambda (info1 info2)
 704                           (string-lessp (git-fileinfo->name info1)
 705                                         (git-fileinfo->name info2)))))
 706    (git-insert-info-list status infolist files)))
 707
 708(defun git-find-status-file (status file)
 709  "Find a given file in the status ewoc and return its node."
 710  (let ((node (ewoc-nth status 0)))
 711    (while (and node (not (string= file (git-fileinfo->name (ewoc-data node)))))
 712      (setq node (ewoc-next status node)))
 713    node))
 714
 715(defun git-run-ls-files (status files default-state &rest options)
 716  "Run git-ls-files on FILES and parse the results into STATUS.
 717Return the list of files that haven't been handled."
 718  (let (infolist)
 719    (with-temp-buffer
 720      (apply #'git-call-process t "ls-files" "-z" (append options (list "--") files))
 721      (goto-char (point-min))
 722      (while (re-search-forward "\\([^\0]*?\\)\\(/?\\)\0" nil t 1)
 723        (let ((name (match-string 1)))
 724          (push (git-create-fileinfo default-state name 0
 725                                     (if (string-equal "/" (match-string 2)) (lsh ?\110 9) 0))
 726                infolist))))
 727    (setq infolist (nreverse infolist))  ;; assume it is sorted already
 728    (git-insert-info-list status infolist files)))
 729
 730(defun git-run-ls-files-cached (status files default-state)
 731  "Run git-ls-files -c on FILES and parse the results into STATUS.
 732Return the list of files that haven't been handled."
 733  (let (infolist)
 734    (with-temp-buffer
 735      (apply #'git-call-process t "ls-files" "-z" "-s" "-c" "--" files)
 736      (goto-char (point-min))
 737      (while (re-search-forward "\\([0-7]\\{6\\}\\) [0-9a-f]\\{40\\} 0\t\\([^\0]+\\)\0" nil t)
 738        (let* ((new-perm (string-to-number (match-string 1) 8))
 739               (old-perm (if (eq default-state 'added) 0 new-perm))
 740               (name (match-string 2)))
 741          (push (git-create-fileinfo default-state name old-perm new-perm) infolist))))
 742    (setq infolist (nreverse infolist))  ;; assume it is sorted already
 743    (git-insert-info-list status infolist files)))
 744
 745(defun git-run-ls-unmerged (status files)
 746  "Run git-ls-files -u on FILES and parse the results into STATUS."
 747  (with-temp-buffer
 748    (apply #'git-call-process t "ls-files" "-z" "-u" "--" files)
 749    (goto-char (point-min))
 750    (let (unmerged-files)
 751      (while (re-search-forward "[0-7]\\{6\\} [0-9a-f]\\{40\\} [123]\t\\([^\0]+\\)\0" nil t)
 752        (push (match-string 1) unmerged-files))
 753      (git-set-filenames-state status unmerged-files 'unmerged))))
 754
 755(defun git-get-exclude-files ()
 756  "Get the list of exclude files to pass to git-ls-files."
 757  (let (files
 758        (config (git-config "core.excludesfile")))
 759    (when (file-readable-p ".git/info/exclude")
 760      (push ".git/info/exclude" files))
 761    (when (and config (file-readable-p config))
 762      (push config files))
 763    files))
 764
 765(defun git-run-ls-files-with-excludes (status files default-state &rest options)
 766  "Run git-ls-files on FILES with appropriate --exclude-from options."
 767  (let ((exclude-files (git-get-exclude-files)))
 768    (apply #'git-run-ls-files status files default-state "--directory" "--no-empty-directory"
 769           (concat "--exclude-per-directory=" git-per-dir-ignore-file)
 770           (append options (mapcar (lambda (f) (concat "--exclude-from=" f)) exclude-files)))))
 771
 772(defun git-update-status-files (&optional files mark-files)
 773  "Update the status of FILES from the index."
 774  (unless git-status (error "Not in git-status buffer."))
 775  ;; set the needs-update flag on existing files
 776  (if (setq files (sort files #'string-lessp))
 777      (git-status-filenames-map
 778       git-status (lambda (info) (setf (git-fileinfo->needs-update info) t)) files)
 779    (ewoc-map (lambda (info) (setf (git-fileinfo->needs-update info) t) nil) git-status)
 780    (git-call-process nil "update-index" "--refresh")
 781    (when git-show-uptodate
 782      (git-run-ls-files-cached git-status nil 'uptodate)))
 783  (let* ((remaining-files
 784          (if (git-empty-db-p) ; we need some special handling for an empty db
 785              (git-run-ls-files-cached git-status files 'added)
 786            (git-run-diff-index git-status files))))
 787    (git-run-ls-unmerged git-status files)
 788    (when (or remaining-files (and git-show-unknown (not files)))
 789      (setq remaining-files (git-run-ls-files-with-excludes git-status remaining-files 'unknown "-o")))
 790    (when (or remaining-files (and git-show-ignored (not files)))
 791      (setq remaining-files (git-run-ls-files-with-excludes git-status remaining-files 'ignored "-o" "-i")))
 792    (unless files
 793      (setq remaining-files (git-get-filenames (ewoc-collect git-status #'git-fileinfo->needs-update))))
 794    (when remaining-files
 795      (setq remaining-files (git-run-ls-files-cached git-status remaining-files 'uptodate)))
 796    (git-set-filenames-state git-status remaining-files nil)
 797    (when mark-files (git-mark-files git-status files))
 798    (git-refresh-files)
 799    (git-refresh-ewoc-hf git-status)))
 800
 801(defun git-mark-files (status files)
 802  "Mark all the specified FILES, and unmark the others."
 803  (let ((file (and files (pop files)))
 804        (node (ewoc-nth status 0)))
 805    (while node
 806      (let ((info (ewoc-data node)))
 807        (if (and file (string-equal (git-fileinfo->name info) file))
 808            (progn
 809              (unless (git-fileinfo->marked info)
 810                (setf (git-fileinfo->marked info) t)
 811                (setf (git-fileinfo->needs-refresh info) t))
 812              (setq file (pop files))
 813              (setq node (ewoc-next status node)))
 814          (when (git-fileinfo->marked info)
 815            (setf (git-fileinfo->marked info) nil)
 816            (setf (git-fileinfo->needs-refresh info) t))
 817          (if (and file (string-lessp file (git-fileinfo->name info)))
 818              (setq file (pop files))
 819            (setq node (ewoc-next status node))))))))
 820
 821(defun git-marked-files ()
 822  "Return a list of all marked files, or if none a list containing just the file at cursor position."
 823  (unless git-status (error "Not in git-status buffer."))
 824  (or (ewoc-collect git-status (lambda (info) (git-fileinfo->marked info)))
 825      (list (ewoc-data (ewoc-locate git-status)))))
 826
 827(defun git-marked-files-state (&rest states)
 828  "Return marked files that are in the specified states."
 829  (let ((files (git-marked-files))
 830        result)
 831    (dolist (info files)
 832      (when (memq (git-fileinfo->state info) states)
 833        (push info result)))
 834    result))
 835
 836(defun git-refresh-files ()
 837  "Refresh all files that need it and clear the needs-refresh flag."
 838  (unless git-status (error "Not in git-status buffer."))
 839  (ewoc-map
 840   (lambda (info)
 841     (let ((refresh (git-fileinfo->needs-refresh info)))
 842       (setf (git-fileinfo->needs-refresh info) nil)
 843       refresh))
 844   git-status)
 845  ; move back to goal column
 846  (when goal-column (move-to-column goal-column)))
 847
 848(defun git-refresh-ewoc-hf (status)
 849  "Refresh the ewoc header and footer."
 850  (let ((branch (git-symbolic-ref "HEAD"))
 851        (head (if (git-empty-db-p) "Nothing committed yet"
 852                (git-get-commit-description "HEAD")))
 853        (merge-heads (git-get-merge-heads)))
 854    (ewoc-set-hf status
 855                 (format "Directory:  %s\nBranch:     %s\nHead:       %s%s\n"
 856                         default-directory
 857                         (if branch
 858                             (if (string-match "^refs/heads/" branch)
 859                                 (substring branch (match-end 0))
 860                               branch)
 861                           "none (detached HEAD)")
 862                         head
 863                         (if merge-heads
 864                             (concat "\nMerging:    "
 865                                     (mapconcat (lambda (str) (git-get-commit-description str)) merge-heads "\n            "))
 866                           ""))
 867                 (if (ewoc-nth status 0) "" "    No changes."))))
 868
 869(defun git-get-filenames (files)
 870  (mapcar (lambda (info) (git-fileinfo->name info)) files))
 871
 872(defun git-update-index (index-file files)
 873  "Run git-update-index on a list of files."
 874  (let ((process-environment (append (and index-file (list (concat "GIT_INDEX_FILE=" index-file)))
 875                                     process-environment))
 876        added deleted modified)
 877    (dolist (info files)
 878      (case (git-fileinfo->state info)
 879        ('added (push info added))
 880        ('deleted (push info deleted))
 881        ('modified (push info modified))))
 882    (and
 883     (or (not added) (apply #'git-call-process-display-error "update-index" "--add" "--" (git-get-filenames added)))
 884     (or (not deleted) (apply #'git-call-process-display-error "update-index" "--remove" "--" (git-get-filenames deleted)))
 885     (or (not modified) (apply #'git-call-process-display-error "update-index" "--" (git-get-filenames modified))))))
 886
 887(defun git-run-pre-commit-hook ()
 888  "Run the pre-commit hook if any."
 889  (unless git-status (error "Not in git-status buffer."))
 890  (let ((files (git-marked-files-state 'added 'deleted 'modified)))
 891    (or (not files)
 892        (not (file-executable-p ".git/hooks/pre-commit"))
 893        (let ((index-file (make-temp-file "gitidx")))
 894          (unwind-protect
 895            (let ((head-tree (unless (git-empty-db-p) (git-rev-parse "HEAD^{tree}"))))
 896              (git-read-tree head-tree index-file)
 897              (git-update-index index-file files)
 898              (git-run-hook "pre-commit" `(("GIT_INDEX_FILE" . ,index-file))))
 899          (delete-file index-file))))))
 900
 901(defun git-do-commit ()
 902  "Perform the actual commit using the current buffer as log message."
 903  (interactive)
 904  (let ((buffer (current-buffer))
 905        (index-file (make-temp-file "gitidx")))
 906    (with-current-buffer log-edit-parent-buffer
 907      (if (git-marked-files-state 'unmerged)
 908          (message "You cannot commit unmerged files, resolve them first.")
 909        (unwind-protect
 910            (let ((files (git-marked-files-state 'added 'deleted 'modified))
 911                  head tree head-tree)
 912              (unless (git-empty-db-p)
 913                (setq head (git-rev-parse "HEAD")
 914                      head-tree (git-rev-parse "HEAD^{tree}")))
 915              (message "Running git commit...")
 916              (when
 917                  (and
 918                   (git-read-tree head-tree index-file)
 919                   (git-update-index nil files)         ;update both the default index
 920                   (git-update-index index-file files)  ;and the temporary one
 921                   (setq tree (git-write-tree index-file)))
 922                (if (or (not (string-equal tree head-tree))
 923                        (yes-or-no-p "The tree was not modified, do you really want to perform an empty commit? "))
 924                    (let ((commit (git-commit-tree buffer tree head)))
 925                      (when commit
 926                        (condition-case nil (delete-file ".git/MERGE_HEAD") (error nil))
 927                        (condition-case nil (delete-file ".git/MERGE_MSG") (error nil))
 928                        (with-current-buffer buffer (erase-buffer))
 929                        (git-update-status-files (git-get-filenames files))
 930                        (git-call-process nil "rerere")
 931                        (git-call-process nil "gc" "--auto")
 932                        (message "Committed %s." commit)
 933                        (git-run-hook "post-commit" nil)))
 934                  (message "Commit aborted."))))
 935          (delete-file index-file))))))
 936
 937
 938;;;; Interactive functions
 939;;;; ------------------------------------------------------------
 940
 941(defun git-mark-file ()
 942  "Mark the file that the cursor is on and move to the next one."
 943  (interactive)
 944  (unless git-status (error "Not in git-status buffer."))
 945  (let* ((pos (ewoc-locate git-status))
 946         (info (ewoc-data pos)))
 947    (setf (git-fileinfo->marked info) t)
 948    (ewoc-invalidate git-status pos)
 949    (ewoc-goto-next git-status 1)))
 950
 951(defun git-unmark-file ()
 952  "Unmark the file that the cursor is on and move to the next one."
 953  (interactive)
 954  (unless git-status (error "Not in git-status buffer."))
 955  (let* ((pos (ewoc-locate git-status))
 956         (info (ewoc-data pos)))
 957    (setf (git-fileinfo->marked info) nil)
 958    (ewoc-invalidate git-status pos)
 959    (ewoc-goto-next git-status 1)))
 960
 961(defun git-unmark-file-up ()
 962  "Unmark the file that the cursor is on and move to the previous one."
 963  (interactive)
 964  (unless git-status (error "Not in git-status buffer."))
 965  (let* ((pos (ewoc-locate git-status))
 966         (info (ewoc-data pos)))
 967    (setf (git-fileinfo->marked info) nil)
 968    (ewoc-invalidate git-status pos)
 969    (ewoc-goto-prev git-status 1)))
 970
 971(defun git-mark-all ()
 972  "Mark all files."
 973  (interactive)
 974  (unless git-status (error "Not in git-status buffer."))
 975  (ewoc-map (lambda (info) (unless (git-fileinfo->marked info)
 976                             (setf (git-fileinfo->marked info) t))) git-status)
 977  ; move back to goal column after invalidate
 978  (when goal-column (move-to-column goal-column)))
 979
 980(defun git-unmark-all ()
 981  "Unmark all files."
 982  (interactive)
 983  (unless git-status (error "Not in git-status buffer."))
 984  (ewoc-map (lambda (info) (when (git-fileinfo->marked info)
 985                             (setf (git-fileinfo->marked info) nil)
 986                             t)) git-status)
 987  ; move back to goal column after invalidate
 988  (when goal-column (move-to-column goal-column)))
 989
 990(defun git-toggle-all-marks ()
 991  "Toggle all file marks."
 992  (interactive)
 993  (unless git-status (error "Not in git-status buffer."))
 994  (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) (not (git-fileinfo->marked info))) t) git-status)
 995  ; move back to goal column after invalidate
 996  (when goal-column (move-to-column goal-column)))
 997
 998(defun git-next-file (&optional n)
 999  "Move the selection down N files."
1000  (interactive "p")
1001  (unless git-status (error "Not in git-status buffer."))
1002  (ewoc-goto-next git-status n))
1003
1004(defun git-prev-file (&optional n)
1005  "Move the selection up N files."
1006  (interactive "p")
1007  (unless git-status (error "Not in git-status buffer."))
1008  (ewoc-goto-prev git-status n))
1009
1010(defun git-next-unmerged-file (&optional n)
1011  "Move the selection down N unmerged files."
1012  (interactive "p")
1013  (unless git-status (error "Not in git-status buffer."))
1014  (let* ((last (ewoc-locate git-status))
1015         (node (ewoc-next git-status last)))
1016    (while (and node (> n 0))
1017      (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
1018        (setq n (1- n))
1019        (setq last node))
1020      (setq node (ewoc-next git-status node)))
1021    (ewoc-goto-node git-status last)))
1022
1023(defun git-prev-unmerged-file (&optional n)
1024  "Move the selection up N unmerged files."
1025  (interactive "p")
1026  (unless git-status (error "Not in git-status buffer."))
1027  (let* ((last (ewoc-locate git-status))
1028         (node (ewoc-prev git-status last)))
1029    (while (and node (> n 0))
1030      (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
1031        (setq n (1- n))
1032        (setq last node))
1033      (setq node (ewoc-prev git-status node)))
1034    (ewoc-goto-node git-status last)))
1035
1036(defun git-insert-file (file)
1037  "Insert file(s) into the git-status buffer."
1038  (interactive "fInsert file: ")
1039  (git-update-status-files (list (file-relative-name file))))
1040
1041(defun git-add-file ()
1042  "Add marked file(s) to the index cache."
1043  (interactive)
1044  (let ((files (git-get-filenames (git-marked-files-state 'unknown 'ignored))))
1045    ;; FIXME: add support for directories
1046    (unless files
1047      (push (file-relative-name (read-file-name "File to add: " nil nil t)) files))
1048    (when (apply 'git-call-process-display-error "update-index" "--add" "--" files)
1049      (git-update-status-files files)
1050      (git-success-message "Added" files))))
1051
1052(defun git-ignore-file ()
1053  "Add marked file(s) to the ignore list."
1054  (interactive)
1055  (let ((files (git-get-filenames (git-marked-files-state 'unknown))))
1056    (unless files
1057      (push (file-relative-name (read-file-name "File to ignore: " nil nil t)) files))
1058    (dolist (f files) (git-append-to-ignore f))
1059    (git-update-status-files files)
1060    (git-success-message "Ignored" files)))
1061
1062(defun git-remove-file ()
1063  "Remove the marked file(s)."
1064  (interactive)
1065  (let ((files (git-get-filenames (git-marked-files-state 'added 'modified 'unknown 'uptodate 'ignored))))
1066    (unless files
1067      (push (file-relative-name (read-file-name "File to remove: " nil nil t)) files))
1068    (if (yes-or-no-p
1069         (format "Remove %d file%s? " (length files) (if (> (length files) 1) "s" "")))
1070        (progn
1071          (dolist (name files)
1072            (ignore-errors
1073              (if (file-directory-p name)
1074                  (delete-directory name)
1075                (delete-file name))))
1076          (when (apply 'git-call-process-display-error "update-index" "--remove" "--" files)
1077            (git-update-status-files files)
1078            (git-success-message "Removed" files)))
1079      (message "Aborting"))))
1080
1081(defun git-revert-file ()
1082  "Revert changes to the marked file(s)."
1083  (interactive)
1084  (let ((files (git-marked-files-state 'added 'deleted 'modified 'unmerged))
1085        added modified)
1086    (when (and files
1087               (yes-or-no-p
1088                (format "Revert %d file%s? " (length files) (if (> (length files) 1) "s" ""))))
1089      (dolist (info files)
1090        (case (git-fileinfo->state info)
1091          ('added (push (git-fileinfo->name info) added))
1092          ('deleted (push (git-fileinfo->name info) modified))
1093          ('unmerged (push (git-fileinfo->name info) modified))
1094          ('modified (push (git-fileinfo->name info) modified))))
1095      ;; check if a buffer contains one of the files and isn't saved
1096      (dolist (file modified)
1097        (let ((buffer (get-file-buffer file)))
1098          (when (and buffer (buffer-modified-p buffer))
1099            (error "Buffer %s is modified. Please kill or save modified buffers before reverting." (buffer-name buffer)))))
1100      (let ((ok (and
1101                 (or (not added)
1102                     (apply 'git-call-process-display-error "update-index" "--force-remove" "--" added))
1103                 (or (not modified)
1104                     (apply 'git-call-process-display-error "checkout" "HEAD" modified)))))
1105        (git-update-status-files (append added modified))
1106        (when ok
1107          (dolist (file modified)
1108            (let ((buffer (get-file-buffer file)))
1109              (when buffer (with-current-buffer buffer (revert-buffer t t t)))))
1110          (git-success-message "Reverted" (git-get-filenames files)))))))
1111
1112(defun git-resolve-file ()
1113  "Resolve conflicts in marked file(s)."
1114  (interactive)
1115  (let ((files (git-get-filenames (git-marked-files-state 'unmerged))))
1116    (when files
1117      (when (apply 'git-call-process-display-error "update-index" "--" files)
1118        (git-update-status-files files)
1119        (git-success-message "Resolved" files)))))
1120
1121(defun git-remove-handled ()
1122  "Remove handled files from the status list."
1123  (interactive)
1124  (ewoc-filter git-status
1125               (lambda (info)
1126                 (case (git-fileinfo->state info)
1127                   ('ignored git-show-ignored)
1128                   ('uptodate git-show-uptodate)
1129                   ('unknown git-show-unknown)
1130                   (t t))))
1131  (unless (ewoc-nth git-status 0)  ; refresh header if list is empty
1132    (git-refresh-ewoc-hf git-status)))
1133
1134(defun git-toggle-show-uptodate ()
1135  "Toogle the option for showing up-to-date files."
1136  (interactive)
1137  (if (setq git-show-uptodate (not git-show-uptodate))
1138      (git-refresh-status)
1139    (git-remove-handled)))
1140
1141(defun git-toggle-show-ignored ()
1142  "Toogle the option for showing ignored files."
1143  (interactive)
1144  (if (setq git-show-ignored (not git-show-ignored))
1145      (progn
1146        (message "Inserting ignored files...")
1147        (git-run-ls-files-with-excludes git-status nil 'ignored "-o" "-i")
1148        (git-refresh-files)
1149        (git-refresh-ewoc-hf git-status)
1150        (message "Inserting ignored files...done"))
1151    (git-remove-handled)))
1152
1153(defun git-toggle-show-unknown ()
1154  "Toogle the option for showing unknown files."
1155  (interactive)
1156  (if (setq git-show-unknown (not git-show-unknown))
1157      (progn
1158        (message "Inserting unknown files...")
1159        (git-run-ls-files-with-excludes git-status nil 'unknown "-o")
1160        (git-refresh-files)
1161        (git-refresh-ewoc-hf git-status)
1162        (message "Inserting unknown files...done"))
1163    (git-remove-handled)))
1164
1165(defun git-expand-directory (info)
1166  "Expand the directory represented by INFO to list its files."
1167  (when (eq (lsh (git-fileinfo->new-perm info) -9) ?\110)
1168    (let ((dir (git-fileinfo->name info)))
1169      (git-set-filenames-state git-status (list dir) nil)
1170      (git-run-ls-files-with-excludes git-status (list (concat dir "/")) 'unknown "-o")
1171      (git-refresh-files)
1172      (git-refresh-ewoc-hf git-status)
1173      t)))
1174
1175(defun git-setup-diff-buffer (buffer)
1176  "Setup a buffer for displaying a diff."
1177  (let ((dir default-directory))
1178    (with-current-buffer buffer
1179      (diff-mode)
1180      (goto-char (point-min))
1181      (setq default-directory dir)
1182      (setq buffer-read-only t)))
1183  (display-buffer buffer)
1184  ; shrink window only if it displays the status buffer
1185  (when (eq (window-buffer) (current-buffer))
1186    (shrink-window-if-larger-than-buffer)))
1187
1188(defun git-diff-file ()
1189  "Diff the marked file(s) against HEAD."
1190  (interactive)
1191  (let ((files (git-marked-files)))
1192    (git-setup-diff-buffer
1193     (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M" "HEAD" "--" (git-get-filenames files)))))
1194
1195(defun git-diff-file-merge-head (arg)
1196  "Diff the marked file(s) against the first merge head (or the nth one with a numeric prefix)."
1197  (interactive "p")
1198  (let ((files (git-marked-files))
1199        (merge-heads (git-get-merge-heads)))
1200    (unless merge-heads (error "No merge in progress"))
1201    (git-setup-diff-buffer
1202     (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M"
1203            (or (nth (1- arg) merge-heads) "HEAD") "--" (git-get-filenames files)))))
1204
1205(defun git-diff-unmerged-file (stage)
1206  "Diff the marked unmerged file(s) against the specified stage."
1207  (let ((files (git-marked-files)))
1208    (git-setup-diff-buffer
1209     (apply #'git-run-command-buffer "*git-diff*" "diff-files" "-p" stage "--" (git-get-filenames files)))))
1210
1211(defun git-diff-file-base ()
1212  "Diff the marked unmerged file(s) against the common base file."
1213  (interactive)
1214  (git-diff-unmerged-file "-1"))
1215
1216(defun git-diff-file-mine ()
1217  "Diff the marked unmerged file(s) against my pre-merge version."
1218  (interactive)
1219  (git-diff-unmerged-file "-2"))
1220
1221(defun git-diff-file-other ()
1222  "Diff the marked unmerged file(s) against the other's pre-merge version."
1223  (interactive)
1224  (git-diff-unmerged-file "-3"))
1225
1226(defun git-diff-file-combined ()
1227  "Do a combined diff of the marked unmerged file(s)."
1228  (interactive)
1229  (git-diff-unmerged-file "-c"))
1230
1231(defun git-diff-file-idiff ()
1232  "Perform an interactive diff on the current file."
1233  (interactive)
1234  (let ((files (git-marked-files-state 'added 'deleted 'modified)))
1235    (unless (eq 1 (length files))
1236      (error "Cannot perform an interactive diff on multiple files."))
1237    (let* ((filename (car (git-get-filenames files)))
1238           (buff1 (find-file-noselect filename))
1239           (buff2 (git-run-command-buffer (concat filename ".~HEAD~") "cat-file" "blob" (concat "HEAD:" filename))))
1240      (ediff-buffers buff1 buff2))))
1241
1242(defun git-log-file ()
1243  "Display a log of changes to the marked file(s)."
1244  (interactive)
1245  (let* ((files (git-marked-files))
1246         (coding-system-for-read git-commits-coding-system)
1247         (buffer (apply #'git-run-command-buffer "*git-log*" "rev-list" "--pretty" "HEAD" "--" (git-get-filenames files))))
1248    (with-current-buffer buffer
1249      ; (git-log-mode)  FIXME: implement log mode
1250      (goto-char (point-min))
1251      (setq buffer-read-only t))
1252    (display-buffer buffer)))
1253
1254(defun git-log-edit-files ()
1255  "Return a list of marked files for use in the log-edit buffer."
1256  (with-current-buffer log-edit-parent-buffer
1257    (git-get-filenames (git-marked-files-state 'added 'deleted 'modified))))
1258
1259(defun git-log-edit-diff ()
1260  "Run a diff of the current files being committed from a log-edit buffer."
1261  (with-current-buffer log-edit-parent-buffer
1262    (git-diff-file)))
1263
1264(defun git-append-sign-off (name email)
1265  "Append a Signed-off-by entry to the current buffer, avoiding duplicates."
1266  (let ((sign-off (format "Signed-off-by: %s <%s>" name email))
1267        (case-fold-search t))
1268    (goto-char (point-min))
1269    (unless (re-search-forward (concat "^" (regexp-quote sign-off)) nil t)
1270      (goto-char (point-min))
1271      (unless (re-search-forward "^Signed-off-by: " nil t)
1272        (setq sign-off (concat "\n" sign-off)))
1273      (goto-char (point-max))
1274      (insert sign-off "\n"))))
1275
1276(defun git-setup-log-buffer (buffer &optional merge-heads author-name author-email subject date msg)
1277  "Setup the log buffer for a commit."
1278  (unless git-status (error "Not in git-status buffer."))
1279  (let ((dir default-directory)
1280        (committer-name (git-get-committer-name))
1281        (committer-email (git-get-committer-email))
1282        (sign-off git-append-signed-off-by))
1283    (with-current-buffer buffer
1284      (cd dir)
1285      (erase-buffer)
1286      (insert
1287       (propertize
1288        (format "Author: %s <%s>\n%s%s"
1289                (or author-name committer-name)
1290                (or author-email committer-email)
1291                (if date (format "Date: %s\n" date) "")
1292                (if merge-heads
1293                    (format "Merge: %s\n"
1294                            (mapconcat 'identity merge-heads " "))
1295                  ""))
1296        'face 'git-header-face)
1297       (propertize git-log-msg-separator 'face 'git-separator-face)
1298       "\n")
1299      (when subject (insert subject "\n\n"))
1300      (cond (msg (insert msg "\n"))
1301            ((file-readable-p ".git/rebase-apply/msg")
1302             (insert-file-contents ".git/rebase-apply/msg"))
1303            ((file-readable-p ".git/MERGE_MSG")
1304             (insert-file-contents ".git/MERGE_MSG")))
1305      ; delete empty lines at end
1306      (goto-char (point-min))
1307      (when (re-search-forward "\n+\\'" nil t)
1308        (replace-match "\n" t t))
1309      (when sign-off (git-append-sign-off committer-name committer-email)))
1310    buffer))
1311
1312(defun git-commit-file ()
1313  "Commit the marked file(s), asking for a commit message."
1314  (interactive)
1315  (unless git-status (error "Not in git-status buffer."))
1316  (when (git-run-pre-commit-hook)
1317    (let ((buffer (get-buffer-create "*git-commit*"))
1318          (coding-system (git-get-commits-coding-system))
1319          author-name author-email subject date)
1320      (when (eq 0 (buffer-size buffer))
1321        (when (file-readable-p ".git/rebase-apply/info")
1322          (with-temp-buffer
1323            (insert-file-contents ".git/rebase-apply/info")
1324            (goto-char (point-min))
1325            (when (re-search-forward "^Author: \\(.*\\)\nEmail: \\(.*\\)$" nil t)
1326              (setq author-name (match-string 1))
1327              (setq author-email (match-string 2)))
1328            (goto-char (point-min))
1329            (when (re-search-forward "^Subject: \\(.*\\)$" nil t)
1330              (setq subject (match-string 1)))
1331            (goto-char (point-min))
1332            (when (re-search-forward "^Date: \\(.*\\)$" nil t)
1333              (setq date (match-string 1)))))
1334        (git-setup-log-buffer buffer (git-get-merge-heads) author-name author-email subject date))
1335      (if (boundp 'log-edit-diff-function)
1336          (log-edit 'git-do-commit nil '((log-edit-listfun . git-log-edit-files)
1337                                         (log-edit-diff-function . git-log-edit-diff)) buffer)
1338        (log-edit 'git-do-commit nil 'git-log-edit-files buffer))
1339      (setq font-lock-keywords (font-lock-compile-keywords git-log-edit-font-lock-keywords))
1340      (setq paragraph-separate (concat (regexp-quote git-log-msg-separator) "$\\|Author: \\|Date: \\|Merge: \\|Signed-off-by: \\|\f\\|[         ]*$"))
1341      (setq buffer-file-coding-system coding-system)
1342      (re-search-forward (regexp-quote (concat git-log-msg-separator "\n")) nil t))))
1343
1344(defun git-setup-commit-buffer (commit)
1345  "Setup the commit buffer with the contents of COMMIT."
1346  (let (parents author-name author-email subject date msg)
1347    (with-temp-buffer
1348      (let ((coding-system (git-get-logoutput-coding-system)))
1349        (git-call-process t "log" "-1" "--pretty=medium" "--abbrev=40" commit)
1350        (goto-char (point-min))
1351        (when (re-search-forward "^Merge: *\\(.*\\)$" nil t)
1352          (setq parents (cdr (split-string (match-string 1) " +"))))
1353        (when (re-search-forward "^Author: *\\(.*\\) <\\(.*\\)>$" nil t)
1354          (setq author-name (match-string 1))
1355          (setq author-email (match-string 2)))
1356        (when (re-search-forward "^Date: *\\(.*\\)$" nil t)
1357          (setq date (match-string 1)))
1358        (while (re-search-forward "^    \\(.*\\)$" nil t)
1359          (push (match-string 1) msg))
1360        (setq msg (nreverse msg))
1361        (setq subject (pop msg))
1362        (while (and msg (zerop (length (car msg))) (pop msg)))))
1363    (git-setup-log-buffer (get-buffer-create "*git-commit*")
1364                          parents author-name author-email subject date
1365                          (mapconcat #'identity msg "\n"))))
1366
1367(defun git-get-commit-files (commit)
1368  "Retrieve the list of files modified by COMMIT."
1369  (let (files)
1370    (with-temp-buffer
1371      (git-call-process t "diff-tree" "-m" "-r" "-z" "--name-only" "--no-commit-id" "--root" commit)
1372      (goto-char (point-min))
1373      (while (re-search-forward "\\([^\0]*\\)\0" nil t 1)
1374        (push (match-string 1) files)))
1375    files))
1376
1377(defun git-read-commit-name (prompt &optional default)
1378  "Ask for a commit name, with completion for local branch, remote branch and tag."
1379  (completing-read prompt
1380                   (list* "HEAD" "ORIG_HEAD" "FETCH_HEAD" (mapcar #'car (git-for-each-ref)))
1381                   nil nil nil nil default))
1382
1383(defun git-checkout (branch &optional merge)
1384  "Checkout a branch, tag, or any commit.
1385Use a prefix arg if git should merge while checking out."
1386  (interactive
1387   (list (git-read-commit-name "Checkout: ")
1388         current-prefix-arg))
1389  (unless git-status (error "Not in git-status buffer."))
1390  (let ((args (list branch "--")))
1391    (when merge (push "-m" args))
1392    (when (apply #'git-call-process-display-error "checkout" args)
1393      (git-update-status-files))))
1394
1395(defun git-branch (branch)
1396  "Create a branch from the current HEAD and switch to it."
1397  (interactive (list (git-read-commit-name "Branch: ")))
1398  (unless git-status (error "Not in git-status buffer."))
1399  (if (git-rev-parse (concat "refs/heads/" branch))
1400      (if (yes-or-no-p (format "Branch %s already exists, replace it? " branch))
1401          (and (git-call-process-display-error "branch" "-f" branch)
1402               (git-call-process-display-error "checkout" branch))
1403        (message "Canceled."))
1404    (git-call-process-display-error "checkout" "-b" branch))
1405    (git-refresh-ewoc-hf git-status))
1406
1407(defun git-amend-commit ()
1408  "Undo the last commit on HEAD, and set things up to commit an
1409amended version of it."
1410  (interactive)
1411  (unless git-status (error "Not in git-status buffer."))
1412  (when (git-empty-db-p) (error "No commit to amend."))
1413  (let* ((commit (git-rev-parse "HEAD"))
1414         (files (git-get-commit-files commit)))
1415    (when (if (git-rev-parse "HEAD^")
1416              (git-call-process-display-error "reset" "--soft" "HEAD^")
1417            (and (git-update-ref "ORIG_HEAD" commit)
1418                 (git-update-ref "HEAD" nil commit)))
1419      (git-update-status-files files t)
1420      (git-setup-commit-buffer commit)
1421      (git-commit-file))))
1422
1423(defun git-cherry-pick-commit (arg)
1424  "Cherry-pick a commit."
1425  (interactive (list (git-read-commit-name "Cherry-pick commit: ")))
1426  (unless git-status (error "Not in git-status buffer."))
1427  (let ((commit (git-rev-parse (concat arg "^0"))))
1428    (unless commit (error "Not a valid commit '%s'." arg))
1429    (when (git-rev-parse (concat commit "^2"))
1430      (error "Cannot cherry-pick a merge commit."))
1431    (let ((files (git-get-commit-files commit))
1432          (ok (git-call-process-display-error "cherry-pick" "-n" commit)))
1433      (git-update-status-files files ok)
1434      (with-current-buffer (git-setup-commit-buffer commit)
1435        (goto-char (point-min))
1436        (if (re-search-forward "^\n*Signed-off-by:" nil t 1)
1437            (goto-char (match-beginning 0))
1438          (goto-char (point-max)))
1439        (insert "(cherry picked from commit " commit ")\n"))
1440      (when ok (git-commit-file)))))
1441
1442(defun git-revert-commit (arg)
1443  "Revert a commit."
1444  (interactive (list (git-read-commit-name "Revert commit: ")))
1445  (unless git-status (error "Not in git-status buffer."))
1446  (let ((commit (git-rev-parse (concat arg "^0"))))
1447    (unless commit (error "Not a valid commit '%s'." arg))
1448    (when (git-rev-parse (concat commit "^2"))
1449      (error "Cannot revert a merge commit."))
1450    (let ((files (git-get-commit-files commit))
1451          (subject (git-get-commit-description commit))
1452          (ok (git-call-process-display-error "revert" "-n" commit)))
1453      (git-update-status-files files ok)
1454      (when (string-match "^[0-9a-f]+ - \\(.*\\)$" subject)
1455        (setq subject (match-string 1 subject)))
1456      (git-setup-log-buffer (get-buffer-create "*git-commit*")
1457                            (git-get-merge-heads) nil nil (format "Revert \"%s\"" subject) nil
1458                            (format "This reverts commit %s.\n" commit))
1459      (when ok (git-commit-file)))))
1460
1461(defun git-find-file ()
1462  "Visit the current file in its own buffer."
1463  (interactive)
1464  (unless git-status (error "Not in git-status buffer."))
1465  (let ((info (ewoc-data (ewoc-locate git-status))))
1466    (unless (git-expand-directory info)
1467      (find-file (git-fileinfo->name info))
1468      (when (eq 'unmerged (git-fileinfo->state info))
1469        (smerge-mode 1)))))
1470
1471(defun git-find-file-other-window ()
1472  "Visit the current file in its own buffer in another window."
1473  (interactive)
1474  (unless git-status (error "Not in git-status buffer."))
1475  (let ((info (ewoc-data (ewoc-locate git-status))))
1476    (find-file-other-window (git-fileinfo->name info))
1477    (when (eq 'unmerged (git-fileinfo->state info))
1478      (smerge-mode))))
1479
1480(defun git-find-file-imerge ()
1481  "Visit the current file in interactive merge mode."
1482  (interactive)
1483  (unless git-status (error "Not in git-status buffer."))
1484  (let ((info (ewoc-data (ewoc-locate git-status))))
1485    (find-file (git-fileinfo->name info))
1486    (smerge-ediff)))
1487
1488(defun git-view-file ()
1489  "View the current file in its own buffer."
1490  (interactive)
1491  (unless git-status (error "Not in git-status buffer."))
1492  (let ((info (ewoc-data (ewoc-locate git-status))))
1493    (view-file (git-fileinfo->name info))))
1494
1495(defun git-refresh-status ()
1496  "Refresh the git status buffer."
1497  (interactive)
1498  (unless git-status (error "Not in git-status buffer."))
1499  (message "Refreshing git status...")
1500  (git-update-status-files)
1501  (message "Refreshing git status...done"))
1502
1503(defun git-status-quit ()
1504  "Quit git-status mode."
1505  (interactive)
1506  (bury-buffer))
1507
1508;;;; Major Mode
1509;;;; ------------------------------------------------------------
1510
1511(defvar git-status-mode-hook nil
1512  "Run after `git-status-mode' is setup.")
1513
1514(defvar git-status-mode-map nil
1515  "Keymap for git major mode.")
1516
1517(defvar git-status nil
1518  "List of all files managed by the git-status mode.")
1519
1520(unless git-status-mode-map
1521  (let ((map (make-keymap))
1522        (commit-map (make-sparse-keymap))
1523        (diff-map (make-sparse-keymap))
1524        (toggle-map (make-sparse-keymap)))
1525    (suppress-keymap map)
1526    (define-key map "?"   'git-help)
1527    (define-key map "h"   'git-help)
1528    (define-key map " "   'git-next-file)
1529    (define-key map "a"   'git-add-file)
1530    (define-key map "c"   'git-commit-file)
1531    (define-key map "\C-c" commit-map)
1532    (define-key map "d"    diff-map)
1533    (define-key map "="   'git-diff-file)
1534    (define-key map "f"   'git-find-file)
1535    (define-key map "\r"  'git-find-file)
1536    (define-key map "g"   'git-refresh-status)
1537    (define-key map "i"   'git-ignore-file)
1538    (define-key map "I"   'git-insert-file)
1539    (define-key map "l"   'git-log-file)
1540    (define-key map "m"   'git-mark-file)
1541    (define-key map "M"   'git-mark-all)
1542    (define-key map "n"   'git-next-file)
1543    (define-key map "N"   'git-next-unmerged-file)
1544    (define-key map "o"   'git-find-file-other-window)
1545    (define-key map "p"   'git-prev-file)
1546    (define-key map "P"   'git-prev-unmerged-file)
1547    (define-key map "q"   'git-status-quit)
1548    (define-key map "r"   'git-remove-file)
1549    (define-key map "R"   'git-resolve-file)
1550    (define-key map "t"    toggle-map)
1551    (define-key map "T"   'git-toggle-all-marks)
1552    (define-key map "u"   'git-unmark-file)
1553    (define-key map "U"   'git-revert-file)
1554    (define-key map "v"   'git-view-file)
1555    (define-key map "x"   'git-remove-handled)
1556    (define-key map "\C-?" 'git-unmark-file-up)
1557    (define-key map "\M-\C-?" 'git-unmark-all)
1558    ; the commit submap
1559    (define-key commit-map "\C-a" 'git-amend-commit)
1560    (define-key commit-map "\C-b" 'git-branch)
1561    (define-key commit-map "\C-o" 'git-checkout)
1562    (define-key commit-map "\C-p" 'git-cherry-pick-commit)
1563    (define-key commit-map "\C-v" 'git-revert-commit)
1564    ; the diff submap
1565    (define-key diff-map "b" 'git-diff-file-base)
1566    (define-key diff-map "c" 'git-diff-file-combined)
1567    (define-key diff-map "=" 'git-diff-file)
1568    (define-key diff-map "e" 'git-diff-file-idiff)
1569    (define-key diff-map "E" 'git-find-file-imerge)
1570    (define-key diff-map "h" 'git-diff-file-merge-head)
1571    (define-key diff-map "m" 'git-diff-file-mine)
1572    (define-key diff-map "o" 'git-diff-file-other)
1573    ; the toggle submap
1574    (define-key toggle-map "u" 'git-toggle-show-uptodate)
1575    (define-key toggle-map "i" 'git-toggle-show-ignored)
1576    (define-key toggle-map "k" 'git-toggle-show-unknown)
1577    (define-key toggle-map "m" 'git-toggle-all-marks)
1578    (setq git-status-mode-map map))
1579  (easy-menu-define git-menu git-status-mode-map
1580    "Git Menu"
1581    `("Git"
1582      ["Refresh" git-refresh-status t]
1583      ["Commit" git-commit-file t]
1584      ["Checkout..." git-checkout t]
1585      ["New Branch..." git-branch t]
1586      ["Cherry-pick Commit..." git-cherry-pick-commit t]
1587      ["Revert Commit..." git-revert-commit t]
1588      ("Merge"
1589        ["Next Unmerged File" git-next-unmerged-file t]
1590        ["Prev Unmerged File" git-prev-unmerged-file t]
1591        ["Mark as Resolved" git-resolve-file t]
1592        ["Interactive Merge File" git-find-file-imerge t]
1593        ["Diff Against Common Base File" git-diff-file-base t]
1594        ["Diff Combined" git-diff-file-combined t]
1595        ["Diff Against Merge Head" git-diff-file-merge-head t]
1596        ["Diff Against Mine" git-diff-file-mine t]
1597        ["Diff Against Other" git-diff-file-other t])
1598      "--------"
1599      ["Add File" git-add-file t]
1600      ["Revert File" git-revert-file t]
1601      ["Ignore File" git-ignore-file t]
1602      ["Remove File" git-remove-file t]
1603      ["Insert File" git-insert-file t]
1604      "--------"
1605      ["Find File" git-find-file t]
1606      ["View File" git-view-file t]
1607      ["Diff File" git-diff-file t]
1608      ["Interactive Diff File" git-diff-file-idiff t]
1609      ["Log" git-log-file t]
1610      "--------"
1611      ["Mark" git-mark-file t]
1612      ["Mark All" git-mark-all t]
1613      ["Unmark" git-unmark-file t]
1614      ["Unmark All" git-unmark-all t]
1615      ["Toggle All Marks" git-toggle-all-marks t]
1616      ["Hide Handled Files" git-remove-handled t]
1617      "--------"
1618      ["Show Uptodate Files" git-toggle-show-uptodate :style toggle :selected git-show-uptodate]
1619      ["Show Ignored Files" git-toggle-show-ignored :style toggle :selected git-show-ignored]
1620      ["Show Unknown Files" git-toggle-show-unknown :style toggle :selected git-show-unknown]
1621      "--------"
1622      ["Quit" git-status-quit t])))
1623
1624
1625;; git mode should only run in the *git status* buffer
1626(put 'git-status-mode 'mode-class 'special)
1627
1628(defun git-status-mode ()
1629  "Major mode for interacting with Git.
1630Commands:
1631\\{git-status-mode-map}"
1632  (kill-all-local-variables)
1633  (buffer-disable-undo)
1634  (setq mode-name "git status"
1635        major-mode 'git-status-mode
1636        goal-column 17
1637        buffer-read-only t)
1638  (use-local-map git-status-mode-map)
1639  (let ((buffer-read-only nil))
1640    (erase-buffer)
1641  (let ((status (ewoc-create 'git-fileinfo-prettyprint "" "")))
1642    (set (make-local-variable 'git-status) status))
1643  (set (make-local-variable 'list-buffers-directory) default-directory)
1644  (make-local-variable 'git-show-uptodate)
1645  (make-local-variable 'git-show-ignored)
1646  (make-local-variable 'git-show-unknown)
1647  (run-hooks 'git-status-mode-hook)))
1648
1649(defun git-find-status-buffer (dir)
1650  "Find the git status buffer handling a specified directory."
1651  (let ((list (buffer-list))
1652        (fulldir (expand-file-name dir))
1653        found)
1654    (while (and list (not found))
1655      (let ((buffer (car list)))
1656        (with-current-buffer buffer
1657          (when (and list-buffers-directory
1658                     (string-equal fulldir (expand-file-name list-buffers-directory))
1659                     (eq major-mode 'git-status-mode))
1660            (setq found buffer))))
1661      (setq list (cdr list)))
1662    found))
1663
1664(defun git-status (dir)
1665  "Entry point into git-status mode."
1666  (interactive "DSelect directory: ")
1667  (setq dir (git-get-top-dir dir))
1668  (if (file-directory-p (concat (file-name-as-directory dir) ".git"))
1669      (let ((buffer (or (and git-reuse-status-buffer (git-find-status-buffer dir))
1670                        (create-file-buffer (expand-file-name "*git-status*" dir)))))
1671        (switch-to-buffer buffer)
1672        (cd dir)
1673        (git-status-mode)
1674        (git-refresh-status)
1675        (goto-char (point-min))
1676        (add-hook 'after-save-hook 'git-update-saved-file))
1677    (message "%s is not a git working tree." dir)))
1678
1679(defun git-update-saved-file ()
1680  "Update the corresponding git-status buffer when a file is saved.
1681Meant to be used in `after-save-hook'."
1682  (let* ((file (expand-file-name buffer-file-name))
1683         (dir (condition-case nil (git-get-top-dir (file-name-directory file)) (error nil)))
1684         (buffer (and dir (git-find-status-buffer dir))))
1685    (when buffer
1686      (with-current-buffer buffer
1687        (let ((filename (file-relative-name file dir)))
1688          ; skip files located inside the .git directory
1689          (unless (string-match "^\\.git/" filename)
1690            (git-call-process nil "add" "--refresh" "--" filename)
1691            (git-update-status-files (list filename))))))))
1692
1693(defun git-help ()
1694  "Display help for Git mode."
1695  (interactive)
1696  (describe-function 'git-status-mode))
1697
1698(provide 'git)
1699;;; git.el ends here