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contrib / emacs / git.elon commit Teach bash about completing arguments for git-tag (88e21dc)
   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.
  64The default is to fall back to the repository config,
  65then 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.
  72The default is to fall back to the git repository config,
  73then 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
  91if 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    (((class color) (background dark)) (:foreground "salmon")))
 104  "Git mode face used to highlight added and modified files."
 105  :group 'git)
 106
 107(defface git-unmerged-face
 108  '((((class color) (background light)) (:foreground "red" :bold t))
 109    (((class color) (background dark)) (:foreground "red" :bold t)))
 110  "Git mode face used to highlight unmerged files."
 111  :group 'git)
 112
 113(defface git-unknown-face
 114  '((((class color) (background light)) (:foreground "goldenrod" :bold t))
 115    (((class color) (background dark)) (:foreground "goldenrod" :bold t)))
 116  "Git mode face used to highlight unknown files."
 117  :group 'git)
 118
 119(defface git-uptodate-face
 120  '((((class color) (background light)) (:foreground "grey60"))
 121    (((class color) (background dark)) (:foreground "grey40")))
 122  "Git mode face used to highlight up-to-date files."
 123  :group 'git)
 124
 125(defface git-ignored-face
 126  '((((class color) (background light)) (:foreground "grey60"))
 127    (((class color) (background dark)) (:foreground "grey40")))
 128  "Git mode face used to highlight ignored files."
 129  :group 'git)
 130
 131(defface git-mark-face
 132  '((((class color) (background light)) (:foreground "red" :bold t))
 133    (((class color) (background dark)) (:foreground "tomato" :bold t)))
 134  "Git mode face used for the file marks."
 135  :group 'git)
 136
 137(defface git-header-face
 138  '((((class color) (background light)) (:foreground "blue"))
 139    (((class color) (background dark)) (:foreground "blue")))
 140  "Git mode face used for commit headers."
 141  :group 'git)
 142
 143(defface git-separator-face
 144  '((((class color) (background light)) (:foreground "brown"))
 145    (((class color) (background dark)) (:foreground "brown")))
 146  "Git mode face used for commit separator."
 147  :group 'git)
 148
 149(defface git-permission-face
 150  '((((class color) (background light)) (:foreground "green" :bold t))
 151    (((class color) (background dark)) (:foreground "green" :bold t)))
 152  "Git mode face used for permission changes."
 153  :group 'git)
 154
 155
 156;;;; Utilities
 157;;;; ------------------------------------------------------------
 158
 159(defconst git-log-msg-separator "--- log message follows this line ---")
 160
 161(defvar git-log-edit-font-lock-keywords
 162  `(("^\\(Author:\\|Date:\\|Parent:\\|Signed-off-by:\\)\\(.*\\)$"
 163     (1 font-lock-keyword-face)
 164     (2 font-lock-function-name-face))
 165    (,(concat "^\\(" (regexp-quote git-log-msg-separator) "\\)$")
 166     (1 font-lock-comment-face))))
 167
 168(defun git-get-env-strings (env)
 169  "Build a list of NAME=VALUE strings from a list of environment strings."
 170  (mapcar (lambda (entry) (concat (car entry) "=" (cdr entry))) env))
 171
 172(defun git-call-process-env (buffer env &rest args)
 173  "Wrapper for call-process that sets environment strings."
 174  (if env
 175      (apply #'call-process "env" nil buffer nil
 176             (append (git-get-env-strings env) (list "git") args))
 177    (apply #'call-process "git" nil buffer nil args)))
 178
 179(defun git-call-process-env-string (env &rest args)
 180  "Wrapper for call-process that sets environment strings,
 181and returns the process output as a string."
 182  (with-temp-buffer
 183    (and (eq 0 (apply #' git-call-process-env t env args))
 184         (buffer-string))))
 185
 186(defun git-run-process-region (buffer start end program args)
 187  "Run a git process with a buffer region as input."
 188  (let ((output-buffer (current-buffer))
 189        (dir default-directory))
 190    (with-current-buffer buffer
 191      (cd dir)
 192      (apply #'call-process-region start end program
 193             nil (list output-buffer nil) nil args))))
 194
 195(defun git-run-command-buffer (buffer-name &rest args)
 196  "Run a git command, sending the output to a buffer named BUFFER-NAME."
 197  (let ((dir default-directory)
 198        (buffer (get-buffer-create buffer-name)))
 199    (message "Running git %s..." (car args))
 200    (with-current-buffer buffer
 201      (let ((default-directory dir)
 202            (buffer-read-only nil))
 203        (erase-buffer)
 204        (apply #'git-call-process-env buffer nil args)))
 205    (message "Running git %s...done" (car args))
 206    buffer))
 207
 208(defun git-run-command (buffer env &rest args)
 209  (message "Running git %s..." (car args))
 210  (apply #'git-call-process-env buffer env args)
 211  (message "Running git %s...done" (car args)))
 212
 213(defun git-run-command-region (buffer start end env &rest args)
 214  "Run a git command with specified buffer region as input."
 215  (message "Running git %s..." (car args))
 216  (unless (eq 0 (if env
 217                    (git-run-process-region
 218                     buffer start end "env"
 219                     (append (git-get-env-strings env) (list "git") args))
 220                  (git-run-process-region
 221                   buffer start end "git" args)))
 222    (error "Failed to run \"git %s\":\n%s" (mapconcat (lambda (x) x) args " ") (buffer-string)))
 223  (message "Running git %s...done" (car args)))
 224
 225(defun git-run-hook (hook env &rest args)
 226  "Run a git hook and display its output if any."
 227  (let ((dir default-directory)
 228        (hook-name (expand-file-name (concat ".git/hooks/" hook))))
 229    (or (not (file-executable-p hook-name))
 230        (let (status (buffer (get-buffer-create "*Git Hook Output*")))
 231          (with-current-buffer buffer
 232            (erase-buffer)
 233            (cd dir)
 234            (setq status
 235                  (if env
 236                      (apply #'call-process "env" nil (list buffer t) nil
 237                             (append (git-get-env-strings env) (list hook-name) args))
 238                    (apply #'call-process hook-name nil (list buffer t) nil args))))
 239          (display-message-or-buffer buffer)
 240          (eq 0 status)))))
 241
 242(defun git-get-string-sha1 (string)
 243  "Read a SHA1 from the specified string."
 244  (and string
 245       (string-match "[0-9a-f]\\{40\\}" string)
 246       (match-string 0 string)))
 247
 248(defun git-get-committer-name ()
 249  "Return the name to use as GIT_COMMITTER_NAME."
 250  ; copied from log-edit
 251  (or git-committer-name
 252      (git-config "user.name")
 253      (and (boundp 'add-log-full-name) add-log-full-name)
 254      (and (fboundp 'user-full-name) (user-full-name))
 255      (and (boundp 'user-full-name) user-full-name)))
 256
 257(defun git-get-committer-email ()
 258  "Return the email address to use as GIT_COMMITTER_EMAIL."
 259  ; copied from log-edit
 260  (or git-committer-email
 261      (git-config "user.email")
 262      (and (boundp 'add-log-mailing-address) add-log-mailing-address)
 263      (and (fboundp 'user-mail-address) (user-mail-address))
 264      (and (boundp 'user-mail-address) user-mail-address)))
 265
 266(defun git-get-commits-coding-system ()
 267  "Return the coding system to use for commits."
 268  (let ((repo-config (git-config "i18n.commitencoding")))
 269    (or git-commits-coding-system
 270        (and repo-config
 271             (fboundp 'locale-charset-to-coding-system)
 272             (locale-charset-to-coding-system repo-config))
 273      'utf-8)))
 274
 275(defun git-get-logoutput-coding-system ()
 276  "Return the coding system used for git-log output."
 277  (let ((repo-config (or (git-config "i18n.logoutputencoding")
 278                         (git-config "i18n.commitencoding"))))
 279    (or git-commits-coding-system
 280        (and repo-config
 281             (fboundp 'locale-charset-to-coding-system)
 282             (locale-charset-to-coding-system repo-config))
 283      'utf-8)))
 284
 285(defun git-escape-file-name (name)
 286  "Escape a file name if necessary."
 287  (if (string-match "[\n\t\"\\]" name)
 288      (concat "\""
 289              (mapconcat (lambda (c)
 290                   (case c
 291                     (?\n "\\n")
 292                     (?\t "\\t")
 293                     (?\\ "\\\\")
 294                     (?\" "\\\"")
 295                     (t (char-to-string c))))
 296                 name "")
 297              "\"")
 298    name))
 299
 300(defun git-get-top-dir (dir)
 301  "Retrieve the top-level directory of a git tree."
 302  (let ((cdup (with-output-to-string
 303                (with-current-buffer standard-output
 304                  (cd dir)
 305                  (unless (eq 0 (call-process "git" nil t nil "rev-parse" "--show-cdup"))
 306                    (error "cannot find top-level git tree for %s." dir))))))
 307    (expand-file-name (concat (file-name-as-directory dir)
 308                              (car (split-string cdup "\n"))))))
 309
 310;stolen from pcl-cvs
 311(defun git-append-to-ignore (file)
 312  "Add a file name to the ignore file in its directory."
 313  (let* ((fullname (expand-file-name file))
 314         (dir (file-name-directory fullname))
 315         (name (file-name-nondirectory fullname))
 316         (ignore-name (expand-file-name git-per-dir-ignore-file dir))
 317         (created (not (file-exists-p ignore-name))))
 318  (save-window-excursion
 319    (set-buffer (find-file-noselect ignore-name))
 320    (goto-char (point-max))
 321    (unless (zerop (current-column)) (insert "\n"))
 322    (insert "/" name "\n")
 323    (sort-lines nil (point-min) (point-max))
 324    (save-buffer))
 325  (when created
 326    (git-run-command nil nil "update-index" "--add" "--" (file-relative-name ignore-name)))
 327  (git-update-status-files (list (file-relative-name ignore-name)) 'unknown)))
 328
 329; propertize definition for XEmacs, stolen from erc-compat
 330(eval-when-compile
 331  (unless (fboundp 'propertize)
 332    (defun propertize (string &rest props)
 333      (let ((string (copy-sequence string)))
 334        (while props
 335          (put-text-property 0 (length string) (nth 0 props) (nth 1 props) string)
 336          (setq props (cddr props)))
 337        string))))
 338
 339;;;; Wrappers for basic git commands
 340;;;; ------------------------------------------------------------
 341
 342(defun git-rev-parse (rev)
 343  "Parse a revision name and return its SHA1."
 344  (git-get-string-sha1
 345   (git-call-process-env-string nil "rev-parse" rev)))
 346
 347(defun git-config (key)
 348  "Retrieve the value associated to KEY in the git repository config file."
 349  (let ((str (git-call-process-env-string nil "config" key)))
 350    (and str (car (split-string str "\n")))))
 351
 352(defun git-symbolic-ref (ref)
 353  "Wrapper for the git-symbolic-ref command."
 354  (let ((str (git-call-process-env-string nil "symbolic-ref" ref)))
 355    (and str (car (split-string str "\n")))))
 356
 357(defun git-update-ref (ref newval &optional oldval reason)
 358  "Update a reference by calling git-update-ref."
 359  (let ((args (and oldval (list oldval))))
 360    (push newval args)
 361    (push ref args)
 362    (when reason
 363     (push reason args)
 364     (push "-m" args))
 365    (eq 0 (apply #'git-call-process-env nil nil "update-ref" args))))
 366
 367(defun git-read-tree (tree &optional index-file)
 368  "Read a tree into the index file."
 369  (apply #'git-call-process-env nil
 370         (if index-file `(("GIT_INDEX_FILE" . ,index-file)) nil)
 371         "read-tree" (if tree (list tree))))
 372
 373(defun git-write-tree (&optional index-file)
 374  "Call git-write-tree and return the resulting tree SHA1 as a string."
 375  (git-get-string-sha1
 376   (git-call-process-env-string (and index-file `(("GIT_INDEX_FILE" . ,index-file))) "write-tree")))
 377
 378(defun git-commit-tree (buffer tree head)
 379  "Call git-commit-tree with buffer as input and return the resulting commit SHA1."
 380  (let ((author-name (git-get-committer-name))
 381        (author-email (git-get-committer-email))
 382        (subject "commit (initial): ")
 383        author-date log-start log-end args coding-system-for-write)
 384    (when head
 385      (setq subject "commit: ")
 386      (push "-p" args)
 387      (push head args))
 388    (with-current-buffer buffer
 389      (goto-char (point-min))
 390      (if
 391          (setq log-start (re-search-forward (concat "^" (regexp-quote git-log-msg-separator) "\n") nil t))
 392          (save-restriction
 393            (narrow-to-region (point-min) log-start)
 394            (goto-char (point-min))
 395            (when (re-search-forward "^Author: +\\(.*?\\) *<\\(.*\\)> *$" nil t)
 396              (setq author-name (match-string 1)
 397                    author-email (match-string 2)))
 398            (goto-char (point-min))
 399            (when (re-search-forward "^Date: +\\(.*\\)$" nil t)
 400              (setq author-date (match-string 1)))
 401            (goto-char (point-min))
 402            (while (re-search-forward "^Parent: +\\([0-9a-f]+\\)" nil t)
 403              (unless (string-equal head (match-string 1))
 404                (setq subject "commit (merge): ")
 405                (push "-p" args)
 406                (push (match-string 1) args))))
 407        (setq log-start (point-min)))
 408      (setq log-end (point-max))
 409      (goto-char log-start)
 410      (when (re-search-forward ".*$" nil t)
 411        (setq subject (concat subject (match-string 0))))
 412      (setq coding-system-for-write buffer-file-coding-system))
 413    (let ((commit
 414           (git-get-string-sha1
 415            (with-output-to-string
 416              (with-current-buffer standard-output
 417                (let ((env `(("GIT_AUTHOR_NAME" . ,author-name)
 418                             ("GIT_AUTHOR_EMAIL" . ,author-email)
 419                             ("GIT_COMMITTER_NAME" . ,(git-get-committer-name))
 420                             ("GIT_COMMITTER_EMAIL" . ,(git-get-committer-email)))))
 421                  (when author-date (push `("GIT_AUTHOR_DATE" . ,author-date) env))
 422                  (apply #'git-run-command-region
 423                         buffer log-start log-end env
 424                         "commit-tree" tree (nreverse args))))))))
 425      (and (git-update-ref "HEAD" commit head subject)
 426           commit))))
 427
 428(defun git-empty-db-p ()
 429  "Check if the git db is empty (no commit done yet)."
 430  (not (eq 0 (call-process "git" nil nil nil "rev-parse" "--verify" "HEAD"))))
 431
 432(defun git-get-merge-heads ()
 433  "Retrieve the merge heads from the MERGE_HEAD file if present."
 434  (let (heads)
 435    (when (file-readable-p ".git/MERGE_HEAD")
 436      (with-temp-buffer
 437        (insert-file-contents ".git/MERGE_HEAD" nil nil nil t)
 438        (goto-char (point-min))
 439        (while (re-search-forward "[0-9a-f]\\{40\\}" nil t)
 440          (push (match-string 0) heads))))
 441    (nreverse heads)))
 442
 443(defun git-get-commit-description (commit)
 444  "Get a one-line description of COMMIT."
 445  (let ((coding-system-for-read (git-get-logoutput-coding-system)))
 446    (let ((descr (git-call-process-env-string nil "log" "--max-count=1" "--pretty=oneline" commit)))
 447      (if (and descr (string-match "\\`\\([0-9a-f]\\{40\\}\\) *\\(.*\\)$" descr))
 448          (concat (substring (match-string 1 descr) 0 10) " - " (match-string 2 descr))
 449        descr))))
 450
 451;;;; File info structure
 452;;;; ------------------------------------------------------------
 453
 454; fileinfo structure stolen from pcl-cvs
 455(defstruct (git-fileinfo
 456            (:copier nil)
 457            (:constructor git-create-fileinfo (state name &optional old-perm new-perm rename-state orig-name marked))
 458            (:conc-name git-fileinfo->))
 459  marked              ;; t/nil
 460  state               ;; current state
 461  name                ;; file name
 462  old-perm new-perm   ;; permission flags
 463  rename-state        ;; rename or copy state
 464  orig-name           ;; original name for renames or copies
 465  needs-refresh)      ;; whether file needs to be refreshed
 466
 467(defvar git-status nil)
 468
 469(defun git-clear-status (status)
 470  "Remove everything from the status list."
 471  (ewoc-filter status (lambda (info) nil)))
 472
 473(defun git-set-files-state (files state)
 474  "Set the state of a list of files."
 475  (dolist (info files)
 476    (unless (eq (git-fileinfo->state info) state)
 477      (setf (git-fileinfo->state info) state)
 478      (setf (git-fileinfo->rename-state info) nil)
 479      (setf (git-fileinfo->orig-name info) nil)
 480      (setf (git-fileinfo->needs-refresh info) t))))
 481
 482(defun git-state-code (code)
 483  "Convert from a string to a added/deleted/modified state."
 484  (case (string-to-char code)
 485    (?M 'modified)
 486    (?? 'unknown)
 487    (?A 'added)
 488    (?D 'deleted)
 489    (?U 'unmerged)
 490    (t nil)))
 491
 492(defun git-status-code-as-string (code)
 493  "Format a git status code as string."
 494  (case code
 495    ('modified (propertize "Modified" 'face 'git-status-face))
 496    ('unknown  (propertize "Unknown " 'face 'git-unknown-face))
 497    ('added    (propertize "Added   " 'face 'git-status-face))
 498    ('deleted  (propertize "Deleted " 'face 'git-status-face))
 499    ('unmerged (propertize "Unmerged" 'face 'git-unmerged-face))
 500    ('uptodate (propertize "Uptodate" 'face 'git-uptodate-face))
 501    ('ignored  (propertize "Ignored " 'face 'git-ignored-face))
 502    (t "?       ")))
 503
 504(defun git-rename-as-string (info)
 505  "Return a string describing the copy or rename associated with INFO, or an empty string if none."
 506  (let ((state (git-fileinfo->rename-state info)))
 507    (if state
 508        (propertize
 509         (concat "   ("
 510                 (if (eq state 'copy) "copied from "
 511                   (if (eq (git-fileinfo->state info) 'added) "renamed from "
 512                     "renamed to "))
 513                 (git-escape-file-name (git-fileinfo->orig-name info))
 514                 ")") 'face 'git-status-face)
 515      "")))
 516
 517(defun git-permissions-as-string (old-perm new-perm)
 518  "Format a permission change as string."
 519  (propertize
 520   (if (or (not old-perm)
 521           (not new-perm)
 522           (eq 0 (logand ?\111 (logxor old-perm new-perm))))
 523       "  "
 524     (if (eq 0 (logand ?\111 old-perm)) "+x" "-x"))
 525  'face 'git-permission-face))
 526
 527(defun git-fileinfo-prettyprint (info)
 528  "Pretty-printer for the git-fileinfo structure."
 529  (insert (concat "   " (if (git-fileinfo->marked info) (propertize "*" 'face 'git-mark-face) " ")
 530                  " " (git-status-code-as-string (git-fileinfo->state info))
 531                  " " (git-permissions-as-string (git-fileinfo->old-perm info) (git-fileinfo->new-perm info))
 532                  "  " (git-escape-file-name (git-fileinfo->name info))
 533                  (git-rename-as-string info))))
 534
 535(defun git-insert-fileinfo (status info &optional refresh)
 536  "Insert INFO in the status buffer, optionally refreshing an existing one."
 537  (let ((node (and refresh
 538                   (git-find-status-file status (git-fileinfo->name info)))))
 539    (setf (git-fileinfo->needs-refresh info) t)
 540    (when node   ;preserve the marked flag
 541      (setf (git-fileinfo->marked info) (git-fileinfo->marked (ewoc-data node))))
 542    (if node (setf (ewoc-data node) info) (ewoc-enter-last status info))))
 543
 544(defun git-run-diff-index (status files)
 545  "Run git-diff-index on FILES and parse the results into STATUS.
 546Return the list of files that haven't been handled."
 547  (let ((refresh files))
 548    (with-temp-buffer
 549      (apply #'git-run-command t nil "diff-index" "-z" "-M" "HEAD" "--" files)
 550      (goto-char (point-min))
 551      (while (re-search-forward
 552              ":\\([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"
 553              nil t 1)
 554        (let ((old-perm (string-to-number (match-string 1) 8))
 555              (new-perm (string-to-number (match-string 2) 8))
 556              (state (or (match-string 4) (match-string 6)))
 557              (name (or (match-string 5) (match-string 7)))
 558              (new-name (match-string 8)))
 559          (if new-name  ; copy or rename
 560              (if (eq ?C (string-to-char state))
 561                  (git-insert-fileinfo status (git-create-fileinfo 'added new-name old-perm new-perm 'copy name) refresh)
 562                (git-insert-fileinfo status (git-create-fileinfo 'deleted name 0 0 'rename new-name) refresh)
 563                (git-insert-fileinfo status (git-create-fileinfo 'added new-name old-perm new-perm 'rename name)) refresh)
 564            (git-insert-fileinfo status (git-create-fileinfo (git-state-code state) name old-perm new-perm) refresh))
 565          (setq files (delete name files))
 566          (when new-name (setq files (delete new-name files)))))))
 567  files)
 568
 569(defun git-find-status-file (status file)
 570  "Find a given file in the status ewoc and return its node."
 571  (let ((node (ewoc-nth status 0)))
 572    (while (and node (not (string= file (git-fileinfo->name (ewoc-data node)))))
 573      (setq node (ewoc-next status node)))
 574    node))
 575
 576(defun git-run-ls-files (status files default-state &rest options)
 577  "Run git-ls-files on FILES and parse the results into STATUS.
 578Return the list of files that haven't been handled."
 579  (let ((refresh files))
 580    (with-temp-buffer
 581      (apply #'git-run-command t nil "ls-files" "-z" "-t" (append options (list "--") files))
 582      (goto-char (point-min))
 583      (while (re-search-forward "\\([HMRCK?]\\) \\([^\0]*\\)\0" nil t 1)
 584        (let ((state (match-string 1))
 585              (name (match-string 2)))
 586          (git-insert-fileinfo status (git-create-fileinfo (or (git-state-code state) default-state) name) refresh)
 587          (setq files (delete name files))))))
 588  files)
 589
 590(defun git-run-ls-unmerged (status files)
 591  "Run git-ls-files -u on FILES and parse the results into STATUS."
 592  (with-temp-buffer
 593    (apply #'git-run-command t nil "ls-files" "-z" "-u" "--" files)
 594    (goto-char (point-min))
 595    (let (unmerged-files)
 596      (while (re-search-forward "[0-7]\\{6\\} [0-9a-f]\\{40\\} [123]\t\\([^\0]+\\)\0" nil t)
 597        (let ((node (git-find-status-file status (match-string 1))))
 598          (when node (push (ewoc-data node) unmerged-files))))
 599      (git-set-files-state unmerged-files 'unmerged))))
 600
 601(defun git-get-exclude-files ()
 602  "Get the list of exclude files to pass to git-ls-files."
 603  (let (files
 604        (config (git-config "core.excludesfile")))
 605    (when (file-readable-p ".git/info/exclude")
 606      (push ".git/info/exclude" files))
 607    (when (and config (file-readable-p config))
 608      (push config files))
 609    files))
 610
 611(defun git-update-status-files (files &optional default-state)
 612  "Update the status of FILES from the index."
 613  (unless git-status (error "Not in git-status buffer."))
 614  (let* ((status git-status)
 615         (remaining-files
 616          (if (git-empty-db-p) ; we need some special handling for an empty db
 617              (git-run-ls-files status files 'added "-c")
 618            (git-run-diff-index status files))))
 619    (git-run-ls-unmerged status files)
 620    (when (or (not files) remaining-files)
 621      (let ((exclude-files (git-get-exclude-files)))
 622        (setq remaining-files (apply #'git-run-ls-files status remaining-files 'unknown "-o"
 623                                     (concat "--exclude-per-directory=" git-per-dir-ignore-file)
 624                                     (mapcar (lambda (f) (concat "--exclude-from=" f)) exclude-files)))))
 625    ; mark remaining files with the default state (or remove them if nil)
 626    (when remaining-files
 627      (if default-state
 628          (ewoc-map (lambda (info)
 629                      (when (member (git-fileinfo->name info) remaining-files)
 630                        (git-set-files-state (list info) default-state))
 631                      nil)
 632                    status)
 633        (ewoc-filter status
 634                     (lambda (info files)
 635                       (not (member (git-fileinfo->name info) files)))
 636                     remaining-files)))
 637    (git-refresh-files)
 638    (git-refresh-ewoc-hf status)))
 639
 640(defun git-marked-files ()
 641  "Return a list of all marked files, or if none a list containing just the file at cursor position."
 642  (unless git-status (error "Not in git-status buffer."))
 643  (or (ewoc-collect git-status (lambda (info) (git-fileinfo->marked info)))
 644      (list (ewoc-data (ewoc-locate git-status)))))
 645
 646(defun git-marked-files-state (&rest states)
 647  "Return marked files that are in the specified states."
 648  (let ((files (git-marked-files))
 649        result)
 650    (dolist (info files)
 651      (when (memq (git-fileinfo->state info) states)
 652        (push info result)))
 653    result))
 654
 655(defun git-refresh-files ()
 656  "Refresh all files that need it and clear the needs-refresh flag."
 657  (unless git-status (error "Not in git-status buffer."))
 658  (ewoc-map
 659   (lambda (info)
 660     (let ((refresh (git-fileinfo->needs-refresh info)))
 661       (setf (git-fileinfo->needs-refresh info) nil)
 662       refresh))
 663   git-status)
 664  ; move back to goal column
 665  (when goal-column (move-to-column goal-column)))
 666
 667(defun git-refresh-ewoc-hf (status)
 668  "Refresh the ewoc header and footer."
 669  (let ((branch (git-symbolic-ref "HEAD"))
 670        (head (if (git-empty-db-p) "Nothing committed yet"
 671                (git-get-commit-description "HEAD")))
 672        (merge-heads (git-get-merge-heads)))
 673    (ewoc-set-hf status
 674                 (format "Directory:  %s\nBranch:     %s\nHead:       %s%s\n"
 675                         default-directory
 676                         (if branch
 677                             (if (string-match "^refs/heads/" branch)
 678                                 (substring branch (match-end 0))
 679                               branch)
 680                           "none (detached HEAD)")
 681                         head
 682                         (if merge-heads
 683                             (concat "\nMerging:    "
 684                                     (mapconcat (lambda (str) (git-get-commit-description str)) merge-heads "\n            "))
 685                           ""))
 686                 (if (ewoc-nth status 0) "" "    No changes."))))
 687
 688(defun git-get-filenames (files)
 689  (mapcar (lambda (info) (git-fileinfo->name info)) files))
 690
 691(defun git-update-index (index-file files)
 692  "Run git-update-index on a list of files."
 693  (let ((env (and index-file `(("GIT_INDEX_FILE" . ,index-file))))
 694        added deleted modified)
 695    (dolist (info files)
 696      (case (git-fileinfo->state info)
 697        ('added (push info added))
 698        ('deleted (push info deleted))
 699        ('modified (push info modified))))
 700    (when added
 701      (apply #'git-run-command nil env "update-index" "--add" "--" (git-get-filenames added)))
 702    (when deleted
 703      (apply #'git-run-command nil env "update-index" "--remove" "--" (git-get-filenames deleted)))
 704    (when modified
 705      (apply #'git-run-command nil env "update-index" "--" (git-get-filenames modified)))))
 706
 707(defun git-run-pre-commit-hook ()
 708  "Run the pre-commit hook if any."
 709  (unless git-status (error "Not in git-status buffer."))
 710  (let ((files (git-marked-files-state 'added 'deleted 'modified)))
 711    (or (not files)
 712        (not (file-executable-p ".git/hooks/pre-commit"))
 713        (let ((index-file (make-temp-file "gitidx")))
 714          (unwind-protect
 715            (let ((head-tree (unless (git-empty-db-p) (git-rev-parse "HEAD^{tree}"))))
 716              (git-read-tree head-tree index-file)
 717              (git-update-index index-file files)
 718              (git-run-hook "pre-commit" `(("GIT_INDEX_FILE" . ,index-file))))
 719          (delete-file index-file))))))
 720
 721(defun git-do-commit ()
 722  "Perform the actual commit using the current buffer as log message."
 723  (interactive)
 724  (let ((buffer (current-buffer))
 725        (index-file (make-temp-file "gitidx")))
 726    (with-current-buffer log-edit-parent-buffer
 727      (if (git-marked-files-state 'unmerged)
 728          (message "You cannot commit unmerged files, resolve them first.")
 729        (unwind-protect
 730            (let ((files (git-marked-files-state 'added 'deleted 'modified))
 731                  head head-tree)
 732              (unless (git-empty-db-p)
 733                (setq head (git-rev-parse "HEAD")
 734                      head-tree (git-rev-parse "HEAD^{tree}")))
 735              (if files
 736                  (progn
 737                    (git-read-tree head-tree index-file)
 738                    (git-update-index nil files)         ;update both the default index
 739                    (git-update-index index-file files)  ;and the temporary one
 740                    (let ((tree (git-write-tree index-file)))
 741                      (if (or (not (string-equal tree head-tree))
 742                              (yes-or-no-p "The tree was not modified, do you really want to perform an empty commit? "))
 743                          (let ((commit (git-commit-tree buffer tree head)))
 744                            (condition-case nil (delete-file ".git/MERGE_HEAD") (error nil))
 745                            (condition-case nil (delete-file ".git/MERGE_MSG") (error nil))
 746                            (with-current-buffer buffer (erase-buffer))
 747                            (git-set-files-state files 'uptodate)
 748                            (git-run-command nil nil "rerere")
 749                            (git-refresh-files)
 750                            (git-refresh-ewoc-hf git-status)
 751                            (message "Committed %s." commit)
 752                            (git-run-hook "post-commit" nil))
 753                        (message "Commit aborted."))))
 754                (message "No files to commit.")))
 755          (delete-file index-file))))))
 756
 757
 758;;;; Interactive functions
 759;;;; ------------------------------------------------------------
 760
 761(defun git-mark-file ()
 762  "Mark the file that the cursor is on and move to the next one."
 763  (interactive)
 764  (unless git-status (error "Not in git-status buffer."))
 765  (let* ((pos (ewoc-locate git-status))
 766         (info (ewoc-data pos)))
 767    (setf (git-fileinfo->marked info) t)
 768    (ewoc-invalidate git-status pos)
 769    (ewoc-goto-next git-status 1)))
 770
 771(defun git-unmark-file ()
 772  "Unmark the file that the cursor is on and move to the next one."
 773  (interactive)
 774  (unless git-status (error "Not in git-status buffer."))
 775  (let* ((pos (ewoc-locate git-status))
 776         (info (ewoc-data pos)))
 777    (setf (git-fileinfo->marked info) nil)
 778    (ewoc-invalidate git-status pos)
 779    (ewoc-goto-next git-status 1)))
 780
 781(defun git-unmark-file-up ()
 782  "Unmark the file that the cursor is on and move to the previous one."
 783  (interactive)
 784  (unless git-status (error "Not in git-status buffer."))
 785  (let* ((pos (ewoc-locate git-status))
 786         (info (ewoc-data pos)))
 787    (setf (git-fileinfo->marked info) nil)
 788    (ewoc-invalidate git-status pos)
 789    (ewoc-goto-prev git-status 1)))
 790
 791(defun git-mark-all ()
 792  "Mark all files."
 793  (interactive)
 794  (unless git-status (error "Not in git-status buffer."))
 795  (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) t) t) git-status)
 796  ; move back to goal column after invalidate
 797  (when goal-column (move-to-column goal-column)))
 798
 799(defun git-unmark-all ()
 800  "Unmark all files."
 801  (interactive)
 802  (unless git-status (error "Not in git-status buffer."))
 803  (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) nil) t) git-status)
 804  ; move back to goal column after invalidate
 805  (when goal-column (move-to-column goal-column)))
 806
 807(defun git-toggle-all-marks ()
 808  "Toggle all file marks."
 809  (interactive)
 810  (unless git-status (error "Not in git-status buffer."))
 811  (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) (not (git-fileinfo->marked info))) t) git-status)
 812  ; move back to goal column after invalidate
 813  (when goal-column (move-to-column goal-column)))
 814
 815(defun git-next-file (&optional n)
 816  "Move the selection down N files."
 817  (interactive "p")
 818  (unless git-status (error "Not in git-status buffer."))
 819  (ewoc-goto-next git-status n))
 820
 821(defun git-prev-file (&optional n)
 822  "Move the selection up N files."
 823  (interactive "p")
 824  (unless git-status (error "Not in git-status buffer."))
 825  (ewoc-goto-prev git-status n))
 826
 827(defun git-next-unmerged-file (&optional n)
 828  "Move the selection down N unmerged files."
 829  (interactive "p")
 830  (unless git-status (error "Not in git-status buffer."))
 831  (let* ((last (ewoc-locate git-status))
 832         (node (ewoc-next git-status last)))
 833    (while (and node (> n 0))
 834      (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
 835        (setq n (1- n))
 836        (setq last node))
 837      (setq node (ewoc-next git-status node)))
 838    (ewoc-goto-node git-status last)))
 839
 840(defun git-prev-unmerged-file (&optional n)
 841  "Move the selection up N unmerged files."
 842  (interactive "p")
 843  (unless git-status (error "Not in git-status buffer."))
 844  (let* ((last (ewoc-locate git-status))
 845         (node (ewoc-prev git-status last)))
 846    (while (and node (> n 0))
 847      (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
 848        (setq n (1- n))
 849        (setq last node))
 850      (setq node (ewoc-prev git-status node)))
 851    (ewoc-goto-node git-status last)))
 852
 853(defun git-add-file ()
 854  "Add marked file(s) to the index cache."
 855  (interactive)
 856  (let ((files (git-get-filenames (git-marked-files-state 'unknown))))
 857    (unless files
 858      (push (file-relative-name (read-file-name "File to add: " nil nil t)) files))
 859    (apply #'git-run-command nil nil "update-index" "--add" "--" files)
 860    (git-update-status-files files 'uptodate)))
 861
 862(defun git-ignore-file ()
 863  "Add marked file(s) to the ignore list."
 864  (interactive)
 865  (let ((files (git-get-filenames (git-marked-files-state 'unknown))))
 866    (unless files
 867      (push (file-relative-name (read-file-name "File to ignore: " nil nil t)) files))
 868    (dolist (f files) (git-append-to-ignore f))
 869    (git-update-status-files files 'ignored)))
 870
 871(defun git-remove-file ()
 872  "Remove the marked file(s)."
 873  (interactive)
 874  (let ((files (git-get-filenames (git-marked-files-state 'added 'modified 'unknown 'uptodate))))
 875    (unless files
 876      (push (file-relative-name (read-file-name "File to remove: " nil nil t)) files))
 877    (if (yes-or-no-p
 878         (format "Remove %d file%s? " (length files) (if (> (length files) 1) "s" "")))
 879        (progn
 880          (dolist (name files)
 881            (when (file-exists-p name) (delete-file name)))
 882          (apply #'git-run-command nil nil "update-index" "--remove" "--" files)
 883          (git-update-status-files files nil))
 884      (message "Aborting"))))
 885
 886(defun git-revert-file ()
 887  "Revert changes to the marked file(s)."
 888  (interactive)
 889  (let ((files (git-marked-files))
 890        added modified)
 891    (when (and files
 892               (yes-or-no-p
 893                (format "Revert %d file%s? " (length files) (if (> (length files) 1) "s" ""))))
 894      (dolist (info files)
 895        (case (git-fileinfo->state info)
 896          ('added (push (git-fileinfo->name info) added))
 897          ('deleted (push (git-fileinfo->name info) modified))
 898          ('unmerged (push (git-fileinfo->name info) modified))
 899          ('modified (push (git-fileinfo->name info) modified))))
 900      (when added
 901        (apply #'git-run-command nil nil "update-index" "--force-remove" "--" added))
 902      (when modified
 903        (apply #'git-run-command nil nil "checkout" "HEAD" modified))
 904      (git-update-status-files (append added modified) 'uptodate))))
 905
 906(defun git-resolve-file ()
 907  "Resolve conflicts in marked file(s)."
 908  (interactive)
 909  (let ((files (git-get-filenames (git-marked-files-state 'unmerged))))
 910    (when files
 911      (apply #'git-run-command nil nil "update-index" "--" files)
 912      (git-update-status-files files 'uptodate))))
 913
 914(defun git-remove-handled ()
 915  "Remove handled files from the status list."
 916  (interactive)
 917  (ewoc-filter git-status
 918               (lambda (info)
 919                 (not (or (eq (git-fileinfo->state info) 'ignored)
 920                          (eq (git-fileinfo->state info) 'uptodate)))))
 921  (unless (ewoc-nth git-status 0)  ; refresh header if list is empty
 922    (git-refresh-ewoc-hf git-status)))
 923
 924(defun git-setup-diff-buffer (buffer)
 925  "Setup a buffer for displaying a diff."
 926  (let ((dir default-directory))
 927    (with-current-buffer buffer
 928      (diff-mode)
 929      (goto-char (point-min))
 930      (setq default-directory dir)
 931      (setq buffer-read-only t)))
 932  (display-buffer buffer)
 933  (shrink-window-if-larger-than-buffer))
 934
 935(defun git-diff-file ()
 936  "Diff the marked file(s) against HEAD."
 937  (interactive)
 938  (let ((files (git-marked-files)))
 939    (git-setup-diff-buffer
 940     (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M" "HEAD" "--" (git-get-filenames files)))))
 941
 942(defun git-diff-file-merge-head (arg)
 943  "Diff the marked file(s) against the first merge head (or the nth one with a numeric prefix)."
 944  (interactive "p")
 945  (let ((files (git-marked-files))
 946        (merge-heads (git-get-merge-heads)))
 947    (unless merge-heads (error "No merge in progress"))
 948    (git-setup-diff-buffer
 949     (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M"
 950            (or (nth (1- arg) merge-heads) "HEAD") "--" (git-get-filenames files)))))
 951
 952(defun git-diff-unmerged-file (stage)
 953  "Diff the marked unmerged file(s) against the specified stage."
 954  (let ((files (git-marked-files)))
 955    (git-setup-diff-buffer
 956     (apply #'git-run-command-buffer "*git-diff*" "diff-files" "-p" stage "--" (git-get-filenames files)))))
 957
 958(defun git-diff-file-base ()
 959  "Diff the marked unmerged file(s) against the common base file."
 960  (interactive)
 961  (git-diff-unmerged-file "-1"))
 962
 963(defun git-diff-file-mine ()
 964  "Diff the marked unmerged file(s) against my pre-merge version."
 965  (interactive)
 966  (git-diff-unmerged-file "-2"))
 967
 968(defun git-diff-file-other ()
 969  "Diff the marked unmerged file(s) against the other's pre-merge version."
 970  (interactive)
 971  (git-diff-unmerged-file "-3"))
 972
 973(defun git-diff-file-combined ()
 974  "Do a combined diff of the marked unmerged file(s)."
 975  (interactive)
 976  (git-diff-unmerged-file "-c"))
 977
 978(defun git-diff-file-idiff ()
 979  "Perform an interactive diff on the current file."
 980  (interactive)
 981  (let ((files (git-marked-files-state 'added 'deleted 'modified)))
 982    (unless (eq 1 (length files))
 983      (error "Cannot perform an interactive diff on multiple files."))
 984    (let* ((filename (car (git-get-filenames files)))
 985           (buff1 (find-file-noselect filename))
 986           (buff2 (git-run-command-buffer (concat filename ".~HEAD~") "cat-file" "blob" (concat "HEAD:" filename))))
 987      (ediff-buffers buff1 buff2))))
 988
 989(defun git-log-file ()
 990  "Display a log of changes to the marked file(s)."
 991  (interactive)
 992  (let* ((files (git-marked-files))
 993         (coding-system-for-read git-commits-coding-system)
 994         (buffer (apply #'git-run-command-buffer "*git-log*" "rev-list" "--pretty" "HEAD" "--" (git-get-filenames files))))
 995    (with-current-buffer buffer
 996      ; (git-log-mode)  FIXME: implement log mode
 997      (goto-char (point-min))
 998      (setq buffer-read-only t))
 999    (display-buffer buffer)))
1000
1001(defun git-log-edit-files ()
1002  "Return a list of marked files for use in the log-edit buffer."
1003  (with-current-buffer log-edit-parent-buffer
1004    (git-get-filenames (git-marked-files-state 'added 'deleted 'modified))))
1005
1006(defun git-append-sign-off (name email)
1007  "Append a Signed-off-by entry to the current buffer, avoiding duplicates."
1008  (let ((sign-off (format "Signed-off-by: %s <%s>" name email))
1009        (case-fold-search t))
1010    (goto-char (point-min))
1011    (unless (re-search-forward (concat "^" (regexp-quote sign-off)) nil t)
1012      (goto-char (point-min))
1013      (unless (re-search-forward "^Signed-off-by: " nil t)
1014        (setq sign-off (concat "\n" sign-off)))
1015      (goto-char (point-max))
1016      (insert sign-off "\n"))))
1017
1018(defun git-setup-log-buffer (buffer &optional author-name author-email subject date msg)
1019  "Setup the log buffer for a commit."
1020  (unless git-status (error "Not in git-status buffer."))
1021  (let ((merge-heads (git-get-merge-heads))
1022        (dir default-directory)
1023        (committer-name (git-get-committer-name))
1024        (committer-email (git-get-committer-email))
1025        (sign-off git-append-signed-off-by))
1026    (with-current-buffer buffer
1027      (cd dir)
1028      (erase-buffer)
1029      (insert
1030       (propertize
1031        (format "Author: %s <%s>\n%s%s"
1032                (or author-name committer-name)
1033                (or author-email committer-email)
1034                (if date (format "Date: %s\n" date) "")
1035                (if merge-heads
1036                    (format "Parent: %s\n%s\n"
1037                            (git-rev-parse "HEAD")
1038                            (mapconcat (lambda (str) (concat "Parent: " str)) merge-heads "\n"))
1039                  ""))
1040        'face 'git-header-face)
1041       (propertize git-log-msg-separator 'face 'git-separator-face)
1042       "\n")
1043      (when subject (insert subject "\n\n"))
1044      (cond (msg (insert msg "\n"))
1045            ((file-readable-p ".dotest/msg")
1046             (insert-file-contents ".dotest/msg"))
1047            ((file-readable-p ".git/MERGE_MSG")
1048             (insert-file-contents ".git/MERGE_MSG")))
1049      ; delete empty lines at end
1050      (goto-char (point-min))
1051      (when (re-search-forward "\n+\\'" nil t)
1052        (replace-match "\n" t t))
1053      (when sign-off (git-append-sign-off committer-name committer-email)))))
1054
1055(defun git-commit-file ()
1056  "Commit the marked file(s), asking for a commit message."
1057  (interactive)
1058  (unless git-status (error "Not in git-status buffer."))
1059  (when (git-run-pre-commit-hook)
1060    (let ((buffer (get-buffer-create "*git-commit*"))
1061          (coding-system (git-get-commits-coding-system))
1062          author-name author-email subject date)
1063      (when (eq 0 (buffer-size buffer))
1064        (when (file-readable-p ".dotest/info")
1065          (with-temp-buffer
1066            (insert-file-contents ".dotest/info")
1067            (goto-char (point-min))
1068            (when (re-search-forward "^Author: \\(.*\\)\nEmail: \\(.*\\)$" nil t)
1069              (setq author-name (match-string 1))
1070              (setq author-email (match-string 2)))
1071            (goto-char (point-min))
1072            (when (re-search-forward "^Subject: \\(.*\\)$" nil t)
1073              (setq subject (match-string 1)))
1074            (goto-char (point-min))
1075            (when (re-search-forward "^Date: \\(.*\\)$" nil t)
1076              (setq date (match-string 1)))))
1077        (git-setup-log-buffer buffer author-name author-email subject date))
1078      (log-edit #'git-do-commit nil #'git-log-edit-files buffer)
1079      (setq font-lock-keywords (font-lock-compile-keywords git-log-edit-font-lock-keywords))
1080      (setq buffer-file-coding-system coding-system)
1081      (re-search-forward (regexp-quote (concat git-log-msg-separator "\n")) nil t))))
1082
1083(defun git-find-file ()
1084  "Visit the current file in its own buffer."
1085  (interactive)
1086  (unless git-status (error "Not in git-status buffer."))
1087  (let ((info (ewoc-data (ewoc-locate git-status))))
1088    (find-file (git-fileinfo->name info))
1089    (when (eq 'unmerged (git-fileinfo->state info))
1090      (smerge-mode 1))))
1091
1092(defun git-find-file-other-window ()
1093  "Visit the current file in its own buffer in another window."
1094  (interactive)
1095  (unless git-status (error "Not in git-status buffer."))
1096  (let ((info (ewoc-data (ewoc-locate git-status))))
1097    (find-file-other-window (git-fileinfo->name info))
1098    (when (eq 'unmerged (git-fileinfo->state info))
1099      (smerge-mode))))
1100
1101(defun git-find-file-imerge ()
1102  "Visit the current file in interactive merge mode."
1103  (interactive)
1104  (unless git-status (error "Not in git-status buffer."))
1105  (let ((info (ewoc-data (ewoc-locate git-status))))
1106    (find-file (git-fileinfo->name info))
1107    (smerge-ediff)))
1108
1109(defun git-view-file ()
1110  "View the current file in its own buffer."
1111  (interactive)
1112  (unless git-status (error "Not in git-status buffer."))
1113  (let ((info (ewoc-data (ewoc-locate git-status))))
1114    (view-file (git-fileinfo->name info))))
1115
1116(defun git-refresh-status ()
1117  "Refresh the git status buffer."
1118  (interactive)
1119  (let* ((status git-status)
1120         (pos (ewoc-locate status))
1121         (cur-name (and pos (git-fileinfo->name (ewoc-data pos)))))
1122    (unless status (error "Not in git-status buffer."))
1123    (git-run-command nil nil "update-index" "--refresh")
1124    (git-clear-status status)
1125    (git-update-status-files nil)
1126    ; move point to the current file name if any
1127    (let ((node (and cur-name (git-find-status-file status cur-name))))
1128      (when node (ewoc-goto-node status node)))))
1129
1130(defun git-status-quit ()
1131  "Quit git-status mode."
1132  (interactive)
1133  (bury-buffer))
1134
1135;;;; Major Mode
1136;;;; ------------------------------------------------------------
1137
1138(defvar git-status-mode-hook nil
1139  "Run after `git-status-mode' is setup.")
1140
1141(defvar git-status-mode-map nil
1142  "Keymap for git major mode.")
1143
1144(defvar git-status nil
1145  "List of all files managed by the git-status mode.")
1146
1147(unless git-status-mode-map
1148  (let ((map (make-keymap))
1149        (diff-map (make-sparse-keymap)))
1150    (suppress-keymap map)
1151    (define-key map "?"   'git-help)
1152    (define-key map "h"   'git-help)
1153    (define-key map " "   'git-next-file)
1154    (define-key map "a"   'git-add-file)
1155    (define-key map "c"   'git-commit-file)
1156    (define-key map "d"    diff-map)
1157    (define-key map "="   'git-diff-file)
1158    (define-key map "f"   'git-find-file)
1159    (define-key map "\r"  'git-find-file)
1160    (define-key map "g"   'git-refresh-status)
1161    (define-key map "i"   'git-ignore-file)
1162    (define-key map "l"   'git-log-file)
1163    (define-key map "m"   'git-mark-file)
1164    (define-key map "M"   'git-mark-all)
1165    (define-key map "n"   'git-next-file)
1166    (define-key map "N"   'git-next-unmerged-file)
1167    (define-key map "o"   'git-find-file-other-window)
1168    (define-key map "p"   'git-prev-file)
1169    (define-key map "P"   'git-prev-unmerged-file)
1170    (define-key map "q"   'git-status-quit)
1171    (define-key map "r"   'git-remove-file)
1172    (define-key map "R"   'git-resolve-file)
1173    (define-key map "T"   'git-toggle-all-marks)
1174    (define-key map "u"   'git-unmark-file)
1175    (define-key map "U"   'git-revert-file)
1176    (define-key map "v"   'git-view-file)
1177    (define-key map "x"   'git-remove-handled)
1178    (define-key map "\C-?" 'git-unmark-file-up)
1179    (define-key map "\M-\C-?" 'git-unmark-all)
1180    ; the diff submap
1181    (define-key diff-map "b" 'git-diff-file-base)
1182    (define-key diff-map "c" 'git-diff-file-combined)
1183    (define-key diff-map "=" 'git-diff-file)
1184    (define-key diff-map "e" 'git-diff-file-idiff)
1185    (define-key diff-map "E" 'git-find-file-imerge)
1186    (define-key diff-map "h" 'git-diff-file-merge-head)
1187    (define-key diff-map "m" 'git-diff-file-mine)
1188    (define-key diff-map "o" 'git-diff-file-other)
1189    (setq git-status-mode-map map)))
1190
1191;; git mode should only run in the *git status* buffer
1192(put 'git-status-mode 'mode-class 'special)
1193
1194(defun git-status-mode ()
1195  "Major mode for interacting with Git.
1196Commands:
1197\\{git-status-mode-map}"
1198  (kill-all-local-variables)
1199  (buffer-disable-undo)
1200  (setq mode-name "git status"
1201        major-mode 'git-status-mode
1202        goal-column 17
1203        buffer-read-only t)
1204  (use-local-map git-status-mode-map)
1205  (let ((buffer-read-only nil))
1206    (erase-buffer)
1207  (let ((status (ewoc-create 'git-fileinfo-prettyprint "" "")))
1208    (set (make-local-variable 'git-status) status))
1209  (set (make-local-variable 'list-buffers-directory) default-directory)
1210  (run-hooks 'git-status-mode-hook)))
1211
1212(defun git-find-status-buffer (dir)
1213  "Find the git status buffer handling a specified directory."
1214  (let ((list (buffer-list))
1215        (fulldir (expand-file-name dir))
1216        found)
1217    (while (and list (not found))
1218      (let ((buffer (car list)))
1219        (with-current-buffer buffer
1220          (when (and list-buffers-directory
1221                     (string-equal fulldir (expand-file-name list-buffers-directory))
1222                     (string-match "\\*git-status\\*$" (buffer-name buffer)))
1223            (setq found buffer))))
1224      (setq list (cdr list)))
1225    found))
1226
1227(defun git-status (dir)
1228  "Entry point into git-status mode."
1229  (interactive "DSelect directory: ")
1230  (setq dir (git-get-top-dir dir))
1231  (if (file-directory-p (concat (file-name-as-directory dir) ".git"))
1232      (let ((buffer (or (and git-reuse-status-buffer (git-find-status-buffer dir))
1233                        (create-file-buffer (expand-file-name "*git-status*" dir)))))
1234        (switch-to-buffer buffer)
1235        (cd dir)
1236        (git-status-mode)
1237        (git-refresh-status)
1238        (goto-char (point-min)))
1239    (message "%s is not a git working tree." dir)))
1240
1241(defun git-help ()
1242  "Display help for Git mode."
1243  (interactive)
1244  (describe-function 'git-status-mode))
1245
1246(provide 'git)
1247;;; git.el ends here