lisp/vc/vc-hg.el

   1 ;;; vc-hg.el --- VC backend for the mercurial version control system  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 2006-2014 Free Software Foundation, Inc.
   4
   5 ;; Author: Ivan Kanis
   6 ;; Maintainer: emacs-devel@gnu.org
   7 ;; Keywords: vc tools
   8 ;; Package: vc
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; This is a mercurial version control backend
  28
  29 ;;; Thanks:
  30
  31 ;;; Bugs:
  32
  33 ;;; Installation:
  34
  35 ;;; Todo:
  36
  37 ;; 1) Implement the rest of the vc interface. See the comment at the
  38 ;; beginning of vc.el. The current status is:
  39
  40 ;; FUNCTION NAME                               STATUS
  41 ;; BACKEND PROPERTIES
  42 ;; * revision-granularity                      OK
  43 ;; STATE-QUERYING FUNCTIONS
  44 ;; * registered (file)                         OK
  45 ;; * state (file)                              OK
  46 ;; - state-heuristic (file)                    NOT NEEDED
  47 ;; - dir-status (dir update-function)          OK
  48 ;; - dir-status-files (dir files ds uf)        OK
  49 ;; - dir-extra-headers (dir)                   OK
  50 ;; - dir-printer (fileinfo)                    OK
  51 ;; * working-revision (file)                   OK
  52 ;; - latest-on-branch-p (file)                 ??
  53 ;; * checkout-model (files)                    OK
  54 ;; - workfile-unchanged-p (file)               OK
  55 ;; - mode-line-string (file)                   NOT NEEDED
  56 ;; STATE-CHANGING FUNCTIONS
  57 ;; * register (files &optional rev comment)    OK
  58 ;; * create-repo ()                            OK
  59 ;; - init-revision ()                          NOT NEEDED
  60 ;; - responsible-p (file)                      OK
  61 ;; - could-register (file)                     OK
  62 ;; - receive-file (file rev)                   ?? PROBABLY NOT NEEDED
  63 ;; - unregister (file)                         OK
  64 ;; * checkin (files rev comment)               OK
  65 ;; * find-revision (file rev buffer)           OK
  66 ;; * checkout (file &optional editable rev)    OK
  67 ;; * revert (file &optional contents-done)     OK
  68 ;; - rollback (files)                          ?? PROBABLY NOT NEEDED
  69 ;; - merge (file rev1 rev2)                    NEEDED
  70 ;; - merge-news (file)                         NEEDED
  71 ;; - steal-lock (file &optional revision)      NOT NEEDED
  72 ;; HISTORY FUNCTIONS
  73 ;; * print-log (files buffer &optional shortlog start-revision limit) OK
  74 ;; - log-view-mode ()                          OK
  75 ;; - show-log-entry (revision)                 NOT NEEDED, DEFAULT IS GOOD
  76 ;; - comment-history (file)                    NOT NEEDED
  77 ;; - update-changelog (files)                  NOT NEEDED
  78 ;; * diff (files &optional rev1 rev2 buffer)   OK
  79 ;; - revision-completion-table (files)         OK?
  80 ;; - annotate-command (file buf &optional rev) OK
  81 ;; - annotate-time ()                          OK
  82 ;; - annotate-current-time ()                  NOT NEEDED
  83 ;; - annotate-extract-revision-at-line ()      OK
  84 ;; TAG SYSTEM
  85 ;; - create-tag (dir name branchp)             OK
  86 ;; - retrieve-tag (dir name update)            OK FIXME UPDATE BUFFERS
  87 ;; MISCELLANEOUS
  88 ;; - make-version-backups-p (file)             ??
  89 ;; - repository-hostname (dirname)             ??
  90 ;; - previous-revision (file rev)              OK
  91 ;; - next-revision (file rev)                  OK
  92 ;; - check-headers ()                          ??
  93 ;; - clear-headers ()                          ??
  94 ;; - delete-file (file)                        TEST IT
  95 ;; - rename-file (old new)                     OK
  96 ;; - find-file-hook ()                         added for bug#10709
  97
  98 ;; 2) Implement Stefan Monnier's advice:
  99 ;; vc-hg-registered and vc-hg-state
 100 ;; Both of those functions should be super extra careful to fail gracefully in
 101 ;; unexpected circumstances. The reason this is important is that any error
 102 ;; there will prevent the user from even looking at the file :-(
 103 ;; Ideally, just like in vc-arch and vc-cvs, checking that the file is under
 104 ;; mercurial's control and extracting the current revision should be done
 105 ;; without even using `hg' (this way even if you don't have `hg' installed,
 106 ;; Emacs is able to tell you this file is under mercurial's control).
 107
 108 ;;; History:
 109 ;;
 110
 111 ;;; Code:
 112
 113 (eval-when-compile
 114   (require 'cl-lib)
 115   (require 'vc)
 116   (require 'vc-dir))
 117
 118 ;;; Customization options
 119
 120 (defgroup vc-hg nil
 121   "VC Mercurial (hg) backend."
 122   :version "24.1"
 123   :group 'vc)
 124
 125 (defcustom vc-hg-global-switches nil
 126   "Global switches to pass to any Hg command."
 127   :type '(choice (const :tag "None" nil)
 128          (string :tag "Argument String")
 129          (repeat :tag "Argument List" :value ("") string))
 130   :version "22.2"
 131   :group 'vc-hg)
 132
 133 (defcustom vc-hg-diff-switches t ; Hg doesn't support common args like -u
 134   "String or list of strings specifying switches for Hg diff under VC.
 135 If nil, use the value of `vc-diff-switches'.  If t, use no switches."
 136   :type '(choice (const :tag "Unspecified" nil)
 137                  (const :tag "None" t)
 138                  (string :tag "Argument String")
 139                  (repeat :tag "Argument List" :value ("") string))
 140   :version "23.1"
 141   :group 'vc-hg)
 142
 143 (defcustom vc-hg-program "hg"
 144   "Name of the Mercurial executable (excluding any arguments)."
 145   :type 'string
 146   :group 'vc-hg)
 147
 148 (defcustom vc-hg-root-log-format
 149   `(,(concat "{rev}:{ifeq(branch, 'default','', '{branch}')}"
 150              ":{bookmarks}:{tags}:{author|person}"
 151              " {date|shortdate} {desc|firstline}\\n")
 152     ,(concat "^\\(?:[+@o x|-]*\\)"      ;Graph data.
 153              "\\([0-9]+\\):\\([^:]*\\)"
 154              ":\\([^:]*\\):\\([^:]*\\):\\(.*?\\)"
 155              "[ \t]+\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\}\\)")
 156     ((1 'log-view-message-face)
 157      (2 'change-log-file)
 158      (3 'change-log-list)
 159      (4 'change-log-conditionals)
 160      (5 'change-log-name)
 161      (6 'change-log-date)))
 162   "Mercurial log template for `vc-hg-print-log' short format.
 163 This should be a list (TEMPLATE REGEXP KEYWORDS), where TEMPLATE
 164 is the \"--template\" argument string to pass to Mercurial,
 165 REGEXP is a regular expression matching the resulting Mercurial
 166 output, and KEYWORDS is a list of `font-lock-keywords' for
 167 highlighting the Log View buffer."
 168   :type '(list string string (repeat sexp))
 169   :group 'vc-hg
 170   :version "24.5")
 171
 172 \f
 173 ;;; Properties of the backend
 174
 175 (defvar vc-hg-history nil)
 176
 177 (defun vc-hg-revision-granularity () 'repository)
 178 (defun vc-hg-checkout-model (_files) 'implicit)
 179
 180 ;;; State querying functions
 181
 182 ;;;###autoload (defun vc-hg-registered (file)
 183 ;;;###autoload   "Return non-nil if FILE is registered with hg."
 184 ;;;###autoload   (if (vc-find-root file ".hg")       ; short cut
 185 ;;;###autoload       (progn
 186 ;;;###autoload         (load "vc-hg" nil t)
 187 ;;;###autoload         (vc-hg-registered file))))
 188
 189 ;; Modeled after the similar function in vc-bzr.el
 190 (defun vc-hg-registered (file)
 191   "Return non-nil if FILE is registered with hg."
 192   (when (vc-hg-root file)           ; short cut
 193     (let ((state (vc-hg-state file)))  ; expensive
 194       (and state (not (memq state '(ignored unregistered)))))))
 195
 196 (defun vc-hg-state (file)
 197   "Hg-specific version of `vc-state'."
 198   (let*
 199       ((status nil)
 200        (default-directory (file-name-directory file))
 201        (out
 202         (with-output-to-string
 203           (with-current-buffer
 204               standard-output
 205             (setq status
 206                   (condition-case nil
 207                       ;; Ignore all errors.
 208                       (let ((process-environment
 209                              ;; Avoid localization of messages so we
 210                              ;; can parse the output.  Disable pager.
 211                              (append
 212                               (list "TERM=dumb" "LANGUAGE=C" "HGPLAIN=1")
 213                               process-environment)))
 214                         (if (file-remote-p file)
 215                             (process-file
 216                              "env" nil t nil
 217                              "HGPLAIN=1" vc-hg-program
 218                              "--config" "alias.status=status"
 219                              "--config" "defaults.status="
 220                              "status" "-A" (file-relative-name file))
 221                           (process-file
 222                            vc-hg-program nil t nil
 223                            "--config" "alias.status=status"
 224                            "--config" "defaults.status="
 225                            "status" "-A" (file-relative-name file))))
 226                     ;; Some problem happened.  E.g. We can't find an `hg'
 227                     ;; executable.
 228                     (error nil)))))))
 229     (when (eq 0 status)
 230         (when (null (string-match ".*: No such file or directory$" out))
 231           (let ((state (aref out 0)))
 232             (cond
 233              ((eq state ?=) 'up-to-date)
 234              ((eq state ?A) 'added)
 235              ((eq state ?M) 'edited)
 236              ((eq state ?I) 'ignored)
 237              ((eq state ?R) 'removed)
 238              ((eq state ?!) 'missing)
 239              ((eq state ??) 'unregistered)
 240              ((eq state ?C) 'up-to-date) ;; Older mercurial versions use this.
 241              (t 'up-to-date)))))))
 242
 243 (defun vc-hg-working-revision (file)
 244   "Hg-specific version of `vc-working-revision'."
 245   (or (ignore-errors
 246         (with-output-to-string
 247           (vc-hg-command standard-output 0 file
 248                          "parent" "--template" "{rev}")))
 249       "0"))
 250
 251 ;;; History functions
 252
 253 (defcustom vc-hg-log-switches nil
 254   "String or list of strings specifying switches for hg log under VC."
 255   :type '(choice (const :tag "None" nil)
 256                  (string :tag "Argument String")
 257                  (repeat :tag "Argument List" :value ("") string))
 258   :group 'vc-hg)
 259
 260 (autoload 'vc-setup-buffer "vc-dispatcher")
 261
 262 (defvar vc-hg-log-graph nil
 263   "If non-nil, use `--graph' in the short log output.")
 264
 265 (defun vc-hg-print-log (files buffer &optional shortlog start-revision limit)
 266   "Print commit log associated with FILES into specified BUFFER.
 267 If SHORTLOG is non-nil, use a short format based on `vc-hg-root-log-format'.
 268 If START-REVISION is non-nil, it is the newest revision to show.
 269 If LIMIT is non-nil, show no more than this many entries."
 270   ;; `vc-do-command' creates the buffer, but we need it before running
 271   ;; the command.
 272   (vc-setup-buffer buffer)
 273   ;; If the buffer exists from a previous invocation it might be
 274   ;; read-only.
 275   (let ((inhibit-read-only t))
 276     (with-current-buffer
 277         buffer
 278       (apply 'vc-hg-command buffer 0 files "log"
 279              (nconc
 280               (when start-revision (list (format "-r%s:0" start-revision)))
 281               (when limit (list "-l" (format "%s" limit)))
 282               (when shortlog `(,@(if vc-hg-log-graph '("--graph"))
 283                                "--template"
 284                                ,(car vc-hg-root-log-format)))
 285               vc-hg-log-switches)))))
 286
 287 (defvar log-view-message-re)
 288 (defvar log-view-file-re)
 289 (defvar log-view-font-lock-keywords)
 290 (defvar log-view-per-file-logs)
 291 (defvar log-view-expanded-log-entry-function)
 292
 293 (define-derived-mode vc-hg-log-view-mode log-view-mode "Hg-Log-View"
 294   (require 'add-log) ;; we need the add-log faces
 295   (set (make-local-variable 'log-view-file-re) "\\`a\\`")
 296   (set (make-local-variable 'log-view-per-file-logs) nil)
 297   (set (make-local-variable 'log-view-message-re)
 298        (if (eq vc-log-view-type 'short)
 299            (cadr vc-hg-root-log-format)
 300          "^changeset:[ \t]*\\([0-9]+\\):\\(.+\\)"))
 301   ;; Allow expanding short log entries
 302   (when (eq vc-log-view-type 'short)
 303     (setq truncate-lines t)
 304     (set (make-local-variable 'log-view-expanded-log-entry-function)
 305          'vc-hg-expanded-log-entry))
 306   (set (make-local-variable 'log-view-font-lock-keywords)
 307        (if (eq vc-log-view-type 'short)
 308            (list (cons (nth 1 vc-hg-root-log-format)
 309                        (nth 2 vc-hg-root-log-format)))
 310          (append
 311           log-view-font-lock-keywords
 312           '(
 313             ;; Handle the case:
 314             ;; user: FirstName LastName <foo@bar>
 315             ("^user:[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
 316              (1 'change-log-name)
 317              (2 'change-log-email))
 318             ;; Handle the cases:
 319             ;; user: foo@bar
 320             ;; and
 321             ;; user: foo
 322             ("^user:[ \t]+\\([A-Za-z0-9_.+-]+\\(?:@[A-Za-z0-9_.-]+\\)?\\)"
 323              (1 'change-log-email))
 324             ("^date: \\(.+\\)" (1 'change-log-date))
 325             ("^tag: +\\([^ ]+\\)$" (1 'highlight))
 326             ("^summary:[ \t]+\\(.+\\)" (1 'log-view-message)))))))
 327
 328 (autoload 'vc-switches "vc")
 329
 330 (defun vc-hg-diff (files &optional oldvers newvers buffer)
 331   "Get a difference report using hg between two revisions of FILES."
 332   (let* ((firstfile (car files))
 333          (working (and firstfile (vc-working-revision firstfile))))
 334     (when (and (equal oldvers working) (not newvers))
 335       (setq oldvers nil))
 336     (when (and (not oldvers) newvers)
 337       (setq oldvers working))
 338     (apply #'vc-hg-command (or buffer "*vc-diff*") nil files "diff"
 339            (append
 340             (vc-switches 'hg 'diff)
 341             (when oldvers
 342               (if newvers
 343                   (list "-r" oldvers "-r" newvers)
 344                 (list "-r" oldvers)))))))
 345
 346 (defun vc-hg-expanded-log-entry (revision)
 347   (with-temp-buffer
 348     (vc-hg-command t nil nil "log" "-r" revision)
 349     (goto-char (point-min))
 350     (unless (eobp)
 351       ;; Indent the expanded log entry.
 352       (indent-region (point-min) (point-max) 2)
 353       (goto-char (point-max))
 354       (buffer-string))))
 355
 356 (defun vc-hg-revision-table (files)
 357   (let ((default-directory (file-name-directory (car files))))
 358     (with-temp-buffer
 359       (vc-hg-command t nil files "log" "--template" "{rev} ")
 360       (split-string
 361        (buffer-substring-no-properties (point-min) (point-max))))))
 362
 363 ;; Modeled after the similar function in vc-cvs.el
 364 (defun vc-hg-revision-completion-table (files)
 365   (letrec ((table (lazy-completion-table
 366                    table (lambda () (vc-hg-revision-table files)))))
 367     table))
 368
 369 (defun vc-hg-annotate-command (file buffer &optional revision)
 370   "Execute \"hg annotate\" on FILE, inserting the contents in BUFFER.
 371 Optional arg REVISION is a revision to annotate from."
 372   (vc-hg-command buffer 0 file "annotate" "-d" "-n" "--follow"
 373                  (when revision (concat "-r" revision))))
 374
 375 (declare-function vc-annotate-convert-time "vc-annotate" (time))
 376
 377 ;; The format for one line output by "hg annotate -d -n" looks like this:
 378 ;;215 Wed Jun 20 21:22:58 2007 -0700: CONTENTS
 379 ;; i.e: VERSION_NUMBER DATE: CONTENTS
 380 ;; If the user has set the "--follow" option, the output looks like:
 381 ;;215 Wed Jun 20 21:22:58 2007 -0700 foo.c: CONTENTS
 382 ;; i.e. VERSION_NUMBER DATE FILENAME: CONTENTS
 383 (defconst vc-hg-annotate-re
 384   "^[ \t]*\\([0-9]+\\) \\(.\\{30\\}\\)\\(?:\\(: \\)\\|\\(?: +\\([^:\n]+\\(?::\\(?:[^: \n][^:\n]*\\)?\\)*\\): \\)\\)")
 385
 386 (defun vc-hg-annotate-time ()
 387   (when (looking-at vc-hg-annotate-re)
 388     (goto-char (match-end 0))
 389     (vc-annotate-convert-time
 390      (date-to-time (match-string-no-properties 2)))))
 391
 392 (defun vc-hg-annotate-extract-revision-at-line ()
 393   (save-excursion
 394     (beginning-of-line)
 395     (when (looking-at vc-hg-annotate-re)
 396       (if (match-beginning 3)
 397           (match-string-no-properties 1)
 398         (cons (match-string-no-properties 1)
 399       (expand-file-name (match-string-no-properties 4)
 400  (vc-hg-root default-directory)))))))
 401
 402 ;;; Tag system
 403
 404 (defun vc-hg-create-tag (dir name branchp)
 405   "Attach the tag NAME to the state of the working copy."
 406   (let ((default-directory dir))
 407     (and (vc-hg-command nil 0 nil "status")
 408          (vc-hg-command nil 0 nil (if branchp "bookmark" "tag") name))))
 409
 410 (defun vc-hg-retrieve-tag (dir name _update)
 411   "Retrieve the version tagged by NAME of all registered files at or below DIR."
 412   (let ((default-directory dir))
 413     (vc-hg-command nil 0 nil "update" name)
 414     ;; FIXME: update buffers if `update' is true
 415     ;; TODO: update *vc-change-log* buffer so can see @ if --graph
 416     ))
 417
 418 ;;; Miscellaneous
 419
 420 (defun vc-hg-previous-revision (_file rev)
 421   (let ((newrev (1- (string-to-number rev))))
 422     (when (>= newrev 0)
 423       (number-to-string newrev))))
 424
 425 (defun vc-hg-next-revision (_file rev)
 426   (let ((newrev (1+ (string-to-number rev)))
 427         (tip-revision
 428          (with-temp-buffer
 429            (vc-hg-command t 0 nil "tip" "--style=default")
 430            (goto-char (point-min))
 431            (re-search-forward "^changeset:[ \t]*\\([0-9]+\\):")
 432            (string-to-number (match-string-no-properties 1)))))
 433     ;; We don't want to exceed the maximum possible revision number, ie
 434     ;; the tip revision.
 435     (when (<= newrev tip-revision)
 436       (number-to-string newrev))))
 437
 438 ;; Modeled after the similar function in vc-bzr.el
 439 (defun vc-hg-delete-file (file)
 440   "Delete FILE and delete it in the hg repository."
 441   (condition-case ()
 442       (delete-file file)
 443     (file-error nil))
 444   (vc-hg-command nil 0 file "remove" "--after" "--force"))
 445
 446 ;; Modeled after the similar function in vc-bzr.el
 447 (defun vc-hg-rename-file (old new)
 448   "Rename file from OLD to NEW using `hg mv'."
 449   (vc-hg-command nil 0 new "mv" old))
 450
 451 (defun vc-hg-register (files &optional _rev _comment)
 452   "Register FILES under hg.
 453 REV is ignored.
 454 COMMENT is ignored."
 455   (vc-hg-command nil 0 files "add"))
 456
 457 (defun vc-hg-create-repo ()
 458   "Create a new Mercurial repository."
 459   (vc-hg-command nil 0 nil "init"))
 460
 461 (defalias 'vc-hg-responsible-p 'vc-hg-root)
 462
 463 ;; Modeled after the similar function in vc-bzr.el
 464 (defun vc-hg-could-register (file)
 465   "Return non-nil if FILE could be registered under hg."
 466   (and (vc-hg-responsible-p file)      ; shortcut
 467        (condition-case ()
 468            (with-temp-buffer
 469              (vc-hg-command t nil file "add" "--dry-run"))
 470              ;; The command succeeds with no output if file is
 471              ;; registered.
 472          (error))))
 473
 474 (defun vc-hg-unregister (file)
 475   "Unregister FILE from hg."
 476   (vc-hg-command nil 0 file "forget"))
 477
 478 (declare-function log-edit-extract-headers "log-edit" (headers string))
 479
 480 (defun vc-hg-checkin (files comment)
 481   "Hg-specific version of `vc-backend-checkin'.
 482 REV is ignored."
 483   (apply 'vc-hg-command nil 0 files
 484          (nconc (list "commit" "-m")
 485                 (log-edit-extract-headers '(("Author" . "--user")
 486                                             ("Date" . "--date"))
 487                                           comment))))
 488
 489 (defun vc-hg-find-revision (file rev buffer)
 490   (let ((coding-system-for-read 'binary)
 491         (coding-system-for-write 'binary))
 492     (if rev
 493         (vc-hg-command buffer 0 file "cat" "-r" rev)
 494       (vc-hg-command buffer 0 file "cat"))))
 495
 496 (defun vc-hg-find-ignore-file (file)
 497   "Return the root directory of the repository of FILE."
 498   (expand-file-name ".hgignore"
 499                     (vc-hg-root file)))
 500
 501 ;; Modeled after the similar function in vc-bzr.el
 502 (defun vc-hg-checkout (file &optional _editable rev)
 503   "Retrieve a revision of FILE.
 504 EDITABLE is ignored.
 505 REV is the revision to check out into WORKFILE."
 506   (let ((coding-system-for-read 'binary)
 507         (coding-system-for-write 'binary))
 508   (with-current-buffer (or (get-file-buffer file) (current-buffer))
 509     (if rev
 510         (vc-hg-command t 0 file "cat" "-r" rev)
 511       (vc-hg-command t 0 file "cat")))))
 512
 513 (defun vc-hg-resolve-when-done ()
 514   "Call \"hg resolve -m\" if the conflict markers have been removed."
 515   (save-excursion
 516     (goto-char (point-min))
 517     (unless (re-search-forward "^<<<<<<< " nil t)
 518       (vc-hg-command nil 0 buffer-file-name "resolve" "-m")
 519       ;; Remove the hook so that it is not called multiple times.
 520       (remove-hook 'after-save-hook 'vc-hg-resolve-when-done t))))
 521
 522 (defun vc-hg-find-file-hook ()
 523   (when (and buffer-file-name
 524              (file-exists-p (concat buffer-file-name ".orig"))
 525              ;; Hg does not seem to have a "conflict" status, eg
 526              ;; hg http://bz.selenic.com/show_bug.cgi?id=2724
 527              (memq (vc-file-getprop buffer-file-name 'vc-state)
 528                    '(edited conflict))
 529              ;; Maybe go on to check that "hg resolve -l" says "U"?
 530              ;; If "hg resolve -l" says there's a conflict but there are no
 531              ;; conflict markers, it's not clear what we should do.
 532              (save-excursion
 533                (goto-char (point-min))
 534                (re-search-forward "^<<<<<<< " nil t)))
 535     ;; Hg may not recognize "conflict" as a state, but we can do better.
 536     (vc-file-setprop buffer-file-name 'vc-state 'conflict)
 537     (smerge-start-session)
 538     (add-hook 'after-save-hook 'vc-hg-resolve-when-done nil t)
 539     (message "There are unresolved conflicts in this file")))
 540
 541
 542 ;; Modeled after the similar function in vc-bzr.el
 543 (defun vc-hg-workfile-unchanged-p (file)
 544   (eq 'up-to-date (vc-hg-state file)))
 545
 546 ;; Modeled after the similar function in vc-bzr.el
 547 (defun vc-hg-revert (file &optional contents-done)
 548   (unless contents-done
 549     (with-temp-buffer (vc-hg-command t 0 file "revert"))))
 550
 551 ;;; Hg specific functionality.
 552
 553 (defvar vc-hg-extra-menu-map
 554   (let ((map (make-sparse-keymap)))
 555     map))
 556
 557 (defun vc-hg-extra-menu () vc-hg-extra-menu-map)
 558
 559 (defun vc-hg-extra-status-menu () vc-hg-extra-menu-map)
 560
 561 (defvar log-view-vc-backend)
 562
 563 (cl-defstruct (vc-hg-extra-fileinfo
 564             (:copier nil)
 565             (:constructor vc-hg-create-extra-fileinfo (rename-state extra-name))
 566             (:conc-name vc-hg-extra-fileinfo->))
 567   rename-state        ;; rename or copy state
 568   extra-name)         ;; original name for copies and rename targets, new name for
 569
 570 (declare-function vc-default-dir-printer "vc-dir" (backend fileentry))
 571
 572 (defun vc-hg-dir-printer (info)
 573   "Pretty-printer for the vc-dir-fileinfo structure."
 574   (let ((extra (vc-dir-fileinfo->extra info)))
 575     (vc-default-dir-printer 'Hg info)
 576     (when extra
 577       (insert (propertize
 578                (format "   (%s %s)"
 579                        (pcase (vc-hg-extra-fileinfo->rename-state extra)
 580                          (`copied "copied from")
 581                          (`renamed-from "renamed from")
 582                          (`renamed-to "renamed to"))
 583                        (vc-hg-extra-fileinfo->extra-name extra))
 584                'face 'font-lock-comment-face)))))
 585
 586 (defun vc-hg-after-dir-status (update-function)
 587   (let ((file nil)
 588         (translation '((?= . up-to-date)
 589                        (?C . up-to-date)
 590                        (?A . added)
 591                        (?R . removed)
 592                        (?M . edited)
 593                        (?I . ignored)
 594                        (?! . missing)
 595                        (?  . copy-rename-line)
 596                        (?? . unregistered)))
 597         (translated nil)
 598         (result nil)
 599         (last-added nil)
 600         (last-line-copy nil))
 601       (goto-char (point-min))
 602       (while (not (eobp))
 603         (setq translated (cdr (assoc (char-after) translation)))
 604         (setq file
 605               (buffer-substring-no-properties (+ (point) 2)
 606                                               (line-end-position)))
 607         (cond ((not translated)
 608                (setq last-line-copy nil))
 609               ((eq translated 'up-to-date)
 610                (setq last-line-copy nil))
 611               ((eq translated 'copy-rename-line)
 612                ;; For copied files the output looks like this:
 613                ;; A COPIED_FILE_NAME
 614                ;;   ORIGINAL_FILE_NAME
 615                (setf (nth 2 last-added)
 616                      (vc-hg-create-extra-fileinfo 'copied file))
 617                (setq last-line-copy t))
 618               ((and last-line-copy (eq translated 'removed))
 619                ;; For renamed files the output looks like this:
 620                ;; A NEW_FILE_NAME
 621                ;;   ORIGINAL_FILE_NAME
 622                ;; R ORIGINAL_FILE_NAME
 623                ;; We need to adjust the previous entry to not think it is a copy.
 624                (setf (vc-hg-extra-fileinfo->rename-state (nth 2 last-added))
 625                      'renamed-from)
 626                (push (list file translated
 627                            (vc-hg-create-extra-fileinfo
 628                             'renamed-to (nth 0 last-added))) result)
 629                (setq last-line-copy nil))
 630               (t
 631                (setq last-added (list file translated nil))
 632                (push last-added result)
 633                (setq last-line-copy nil)))
 634         (forward-line))
 635       (funcall update-function result)))
 636
 637 ;; Follows vc-hg-command (or vc-do-async-command), which uses vc-do-command
 638 ;; from vc-dispatcher.
 639 (declare-function vc-exec-after "vc-dispatcher" (code))
 640 ;; Follows vc-exec-after.
 641 (declare-function vc-set-async-update "vc-dispatcher" (process-buffer))
 642
 643 (defun vc-hg-dir-status (dir update-function)
 644   (vc-hg-command (current-buffer) 'async dir "status" "-C")
 645   (vc-run-delayed
 646    (vc-hg-after-dir-status update-function)))
 647
 648 (defun vc-hg-dir-status-files (dir files _default-state update-function)
 649   (apply 'vc-hg-command (current-buffer) 'async dir "status" "-C" files)
 650   (vc-run-delayed
 651    (vc-hg-after-dir-status update-function)))
 652
 653 (defun vc-hg-dir-extra-header (name &rest commands)
 654   (concat (propertize name 'face 'font-lock-type-face)
 655           (propertize
 656            (with-temp-buffer
 657              (apply 'vc-hg-command (current-buffer) 0 nil commands)
 658              (buffer-substring-no-properties (point-min) (1- (point-max))))
 659            'face 'font-lock-variable-name-face)))
 660
 661 (defun vc-hg-dir-extra-headers (dir)
 662   "Generate extra status headers for a Mercurial tree."
 663   (let ((default-directory dir))
 664     (concat
 665      (vc-hg-dir-extra-header "Root       : " "root") "\n"
 666      (vc-hg-dir-extra-header "Branch     : " "id" "-b") "\n"
 667      (vc-hg-dir-extra-header "Tags       : " "id" "-t") ; "\n"
 668      ;; these change after each commit
 669      ;; (vc-hg-dir-extra-header "Local num  : " "id" "-n") "\n"
 670      ;; (vc-hg-dir-extra-header "Global id  : " "id" "-i")
 671      )))
 672
 673 (defun vc-hg-log-incoming (buffer remote-location)
 674   (vc-hg-command buffer 1 nil "incoming" "-n" (unless (string= remote-location "")
 675                                                 remote-location)))
 676
 677 (defun vc-hg-log-outgoing (buffer remote-location)
 678   (vc-hg-command buffer 1 nil "outgoing" "-n" (unless (string= remote-location "")
 679                                                 remote-location)))
 680
 681 (declare-function log-view-get-marked "log-view" ())
 682
 683 ;; XXX maybe also add key bindings for these functions.
 684 (defun vc-hg-push ()
 685   (interactive)
 686   (let ((marked-list (log-view-get-marked)))
 687     (if marked-list
 688         (apply #'vc-hg-command
 689                nil 0 nil
 690                "push"
 691                (apply 'nconc
 692                       (mapcar (lambda (arg) (list "-r" arg)) marked-list)))
 693       (error "No log entries selected for push"))))
 694
 695 (defvar vc-hg-error-regexp-alist nil
 696   ;; 'hg pull' does not list modified files, so, for now, the only
 697   ;; benefit of `vc-compilation-mode' is that one can get rid of
 698   ;; *vc-hg* buffer with 'q' or 'z'.
 699   ;; TODO: call 'hg incoming' before pull/merge to get the list of
 700   ;;       modified files
 701   "Value of `compilation-error-regexp-alist' in *vc-hg* buffers.")
 702
 703 (autoload 'vc-do-async-command "vc-dispatcher")
 704
 705 (defun vc-hg-pull (prompt)
 706   "Issue a Mercurial pull command.
 707 If called interactively with a set of marked Log View buffers,
 708 call \"hg pull -r REVS\" to pull in the specified revisions REVS.
 709
 710 With a prefix argument or if PROMPT is non-nil, prompt for a
 711 specific Mercurial pull command.  The default is \"hg pull -u\",
 712 which fetches changesets from the default remote repository and
 713 then attempts to update the working directory."
 714   (interactive "P")
 715   (let (marked-list)
 716     ;; The `vc-hg-pull' command existed before the `pull' VC action
 717     ;; was implemented.  Keep it for backward compatibility.
 718     (if (and (called-interactively-p 'interactive)
 719              (setq marked-list (log-view-get-marked)))
 720         (apply #'vc-hg-command
 721                nil 0 nil
 722                "pull"
 723                (apply 'nconc
 724                       (mapcar (lambda (arg) (list "-r" arg))
 725                               marked-list)))
 726       (let* ((root (vc-hg-root default-directory))
 727              (buffer (format "*vc-hg : %s*" (expand-file-name root)))
 728              (command "pull")
 729              (hg-program vc-hg-program)
 730              ;; Fixme: before updating the working copy to the latest
 731              ;; state, should check if it's visiting an old revision.
 732              (args '("-u")))
 733         ;; If necessary, prompt for the exact command.
 734         (when prompt
 735           (setq args (split-string
 736                       (read-shell-command "Run Hg (like this): "
 737                                           (format "%s pull -u" hg-program)
 738                                           'vc-hg-history)
 739                       " " t))
 740           (setq hg-program (car  args)
 741                 command    (cadr args)
 742                 args       (cddr args)))
 743         (apply 'vc-do-async-command buffer root hg-program
 744                command args)
 745         (with-current-buffer buffer
 746           (vc-run-delayed (vc-compilation-mode 'hg)))
 747         (vc-set-async-update buffer)))))
 748
 749 (defun vc-hg-merge-branch ()
 750   "Merge incoming changes into the current working directory.
 751 This runs the command \"hg merge\"."
 752   (let* ((root (vc-hg-root default-directory))
 753          (buffer (format "*vc-hg : %s*" (expand-file-name root))))
 754     (apply 'vc-do-async-command buffer root vc-hg-program '("merge"))
 755     (with-current-buffer buffer (vc-run-delayed (vc-compilation-mode 'hg)))
 756     (vc-set-async-update buffer)))
 757
 758 ;;; Internal functions
 759
 760 (defun vc-hg-command (buffer okstatus file-or-list &rest flags)
 761   "A wrapper around `vc-do-command' for use in vc-hg.el.
 762 This function differs from vc-do-command in that it invokes
 763 `vc-hg-program', and passes `vc-hg-global-switches' to it before FLAGS."
 764   (apply 'vc-do-command (or buffer "*vc*") okstatus vc-hg-program file-or-list
 765          (if (stringp vc-hg-global-switches)
 766              (cons vc-hg-global-switches flags)
 767            (append vc-hg-global-switches
 768                    flags))))
 769
 770 (defun vc-hg-root (file)
 771   (vc-find-root file ".hg"))
 772
 773 (provide 'vc-hg)
 774
 775 ;;; vc-hg.el ends here