lisp/vc-cvs.el

   1 ;;; vc-cvs.el --- non-resident support for CVS version-control
   2
   3 ;; Copyright (C) 1995,98,99,2000,2001,02,2003, 2005
   4 ;;  Free Software Foundation, Inc.
   5
   6 ;; Author:      FSF (see vc.el for full credits)
   7 ;; Maintainer:  Andre Spiegel <spiegel@gnu.org>
   8
   9 ;; $Id$
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software; you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation; either version 2, or (at your option)
  16 ;; any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  26 ;; Boston, MA 02111-1307, USA.
  27
  28 ;;; Commentary:
  29
  30 ;;; Code:
  31
  32 (eval-when-compile
  33   (require 'vc))
  34
  35 ;;;
  36 ;;; Customization options
  37 ;;;
  38
  39 (defcustom vc-cvs-global-switches nil
  40   "*Global switches to pass to any CVS command."
  41   :type '(choice (const :tag "None" nil)
  42                  (string :tag "Argument String")
  43                  (repeat :tag "Argument List"
  44                          :value ("")
  45                          string))
  46   :version "22.1"
  47   :group 'vc)
  48
  49 (defcustom vc-cvs-register-switches nil
  50   "*Extra switches for registering a file into CVS.
  51 A string or list of strings passed to the checkin program by
  52 \\[vc-register]."
  53   :type '(choice (const :tag "None" nil)
  54                  (string :tag "Argument String")
  55                  (repeat :tag "Argument List"
  56                          :value ("")
  57                          string))
  58   :version "21.1"
  59   :group 'vc)
  60
  61 (defcustom vc-cvs-diff-switches nil
  62   "*A string or list of strings specifying extra switches for cvs diff under VC."
  63     :type '(choice (const :tag "None" nil)
  64                  (string :tag "Argument String")
  65                  (repeat :tag "Argument List"
  66                          :value ("")
  67                          string))
  68   :version "21.1"
  69   :group 'vc)
  70
  71 (defcustom vc-cvs-header (or (cdr (assoc 'CVS vc-header-alist)) '("\$Id\$"))
  72   "*Header keywords to be inserted by `vc-insert-headers'."
  73   :version "21.1"
  74   :type '(repeat string)
  75   :group 'vc)
  76
  77 (defcustom vc-cvs-use-edit t
  78   "*Non-nil means to use `cvs edit' to \"check out\" a file.
  79 This is only meaningful if you don't use the implicit checkout model
  80 \(i.e. if you have $CVSREAD set)."
  81   :type 'boolean
  82   :version "21.1"
  83   :group 'vc)
  84
  85 (defcustom vc-cvs-stay-local t
  86   "*Non-nil means use local operations when possible for remote repositories.
  87 This avoids slow queries over the network and instead uses heuristics
  88 and past information to determine the current status of a file.
  89
  90 The value can also be a regular expression or list of regular
  91 expressions to match against the host name of a repository; then VC
  92 only stays local for hosts that match it.  Alternatively, the value
  93 can be a list of regular expressions where the first element is the
  94 symbol `except'; then VC always stays local except for hosts matched
  95 by these regular expressions."
  96   :type '(choice (const :tag "Always stay local" t)
  97                 (const :tag "Don't stay local" nil)
  98                  (list :format "\nExamine hostname and %v" :tag "Examine hostname ..."
  99                        (set :format "%v" :inline t (const :format "%t" :tag "don't" except))
 100                        (regexp :format " stay local,\n%t: %v" :tag "if it matches")
 101                        (repeat :format "%v%i\n" :inline t (regexp :tag "or"))))
 102   :version "21.1"
 103   :group 'vc)
 104
 105 (defcustom vc-cvs-sticky-date-format-string "%c"
 106   "*Format string for mode-line display of sticky date.
 107 Format is according to `format-time-string'.  Only used if
 108 `vc-cvs-sticky-tag-display' is t."
 109   :type '(string)
 110   :version "22.1"
 111   :group 'vc)
 112
 113 (defcustom vc-cvs-sticky-tag-display t
 114   "*Specify the mode-line display of sticky tags.
 115 Value t means default display, nil means no display at all.  If the
 116 value is a function or macro, it is called with the sticky tag and
 117 its' type as parameters, in that order.  TYPE can have three different
 118 values: `symbolic-name' (TAG is a string), `revision-number' (TAG is a
 119 string) and `date' (TAG is a date as returned by `encode-time').  The
 120 return value of the function or macro will be displayed as a string.
 121
 122 Here's an example that will display the formatted date for sticky
 123 dates and the word \"Sticky\" for sticky tag names and revisions.
 124
 125   (lambda (tag type)
 126     (cond ((eq type 'date) (format-time-string
 127                               vc-cvs-sticky-date-format-string tag))
 128           ((eq type 'revision-number) \"Sticky\")
 129           ((eq type 'symbolic-name) \"Sticky\")))
 130
 131 Here's an example that will abbreviate to the first character only,
 132 any text before the first occurrence of `-' for sticky symbolic tags.
 133 If the sticky tag is a revision number, the word \"Sticky\" is
 134 displayed.  Date and time is displayed for sticky dates.
 135
 136    (lambda (tag type)
 137      (cond ((eq type 'date) (format-time-string \"%Y%m%d %H:%M\" tag))
 138            ((eq type 'revision-number) \"Sticky\")
 139            ((eq type 'symbolic-name)
 140             (condition-case nil
 141                 (progn
 142                   (string-match \"\\\\([^-]*\\\\)\\\\(.*\\\\)\" tag)
 143                   (concat (substring (match-string 1 tag) 0 1) \":\"
 144                           (substring (match-string 2 tag) 1 nil)))
 145               (error tag)))))       ; Fall-back to given tag name.
 146
 147 See also variable `vc-cvs-sticky-date-format-string'."
 148   :type '(choice boolean function)
 149   :version "22.1"
 150   :group 'vc)
 151
 152 ;;;
 153 ;;; Internal variables
 154 ;;;
 155
 156
 157 ;;;
 158 ;;; State-querying functions
 159 ;;;
 160
 161 ;;;###autoload (defun vc-cvs-registered (f)
 162 ;;;###autoload   (when (file-readable-p (expand-file-name
 163 ;;;###autoload                    "CVS/Entries" (file-name-directory f)))
 164 ;;;###autoload       (load "vc-cvs")
 165 ;;;###autoload       (vc-cvs-registered f)))
 166
 167 (defun vc-cvs-registered (file)
 168   "Check if FILE is CVS registered."
 169   (let ((dirname (or (file-name-directory file) ""))
 170         (basename (file-name-nondirectory file))
 171         ;; make sure that the file name is searched case-sensitively
 172         (case-fold-search nil))
 173     (if (file-readable-p (expand-file-name "CVS/Entries" dirname))
 174         (with-temp-buffer
 175           (vc-cvs-get-entries dirname)
 176           (goto-char (point-min))
 177           (cond
 178            ((re-search-forward
 179              ;; CVS-removed files are not taken under VC control.
 180              (concat "^/" (regexp-quote basename) "/[^/-]") nil t)
 181             (beginning-of-line)
 182             (vc-cvs-parse-entry file)
 183             t)
 184            (t nil)))
 185       nil)))
 186
 187 (defun vc-cvs-state (file)
 188   "CVS-specific version of `vc-state'."
 189   (if (vc-stay-local-p file)
 190       (let ((state (vc-file-getprop file 'vc-state)))
 191         ;; If we should stay local, use the heuristic but only if
 192         ;; we don't have a more precise state already available.
 193         (if (memq state '(up-to-date edited nil))
 194             (vc-cvs-state-heuristic file)
 195           state))
 196     (with-temp-buffer
 197       (cd (file-name-directory file))
 198       (vc-cvs-command t 0 file "status")
 199       (vc-cvs-parse-status t))))
 200
 201 (defun vc-cvs-state-heuristic (file)
 202   "CVS-specific state heuristic."
 203   ;; If the file has not changed since checkout, consider it `up-to-date'.
 204   ;; Otherwise consider it `edited'.
 205   (let ((checkout-time (vc-file-getprop file 'vc-checkout-time))
 206         (lastmod (nth 5 (file-attributes file))))
 207     (if (equal checkout-time lastmod)
 208         'up-to-date
 209       'edited)))
 210
 211 (defun vc-cvs-dir-state (dir)
 212   "Find the CVS state of all files in DIR."
 213   ;; if DIR is not under CVS control, don't do anything.
 214   (when (file-readable-p (expand-file-name "CVS/Entries" dir))
 215     (if (vc-stay-local-p dir)
 216         (vc-cvs-dir-state-heuristic dir)
 217       (let ((default-directory dir))
 218         ;; Don't specify DIR in this command, the default-directory is
 219         ;; enough.  Otherwise it might fail with remote repositories.
 220         (with-temp-buffer
 221           (vc-cvs-command t 0 nil "status" "-l")
 222           (goto-char (point-min))
 223           (while (re-search-forward "^=+\n\\([^=\n].*\n\\|\n\\)+" nil t)
 224             (narrow-to-region (match-beginning 0) (match-end 0))
 225             (vc-cvs-parse-status)
 226             (goto-char (point-max))
 227             (widen)))))))
 228
 229 (defun vc-cvs-workfile-version (file)
 230   "CVS-specific version of `vc-workfile-version'."
 231   ;; There is no need to consult RCS headers under CVS, because we
 232   ;; get the workfile version for free when we recognize that a file
 233   ;; is registered in CVS.
 234   (vc-cvs-registered file)
 235   (vc-file-getprop file 'vc-workfile-version))
 236
 237 (defun vc-cvs-checkout-model (file)
 238   "CVS-specific version of `vc-checkout-model'."
 239   (if (getenv "CVSREAD")
 240       'announce
 241     (let ((attrib (file-attributes file)))
 242       (if (and attrib ;; don't check further if FILE doesn't exist
 243                ;; If the file is not writable (despite CVSREAD being
 244                ;; undefined), this is probably because the file is being
 245                ;; "watched" by other developers.
 246                ;; (If vc-mistrust-permissions was t, we actually shouldn't
 247                ;; trust this, but there is no other way to learn this from CVS
 248                ;; at the moment (version 1.9).)
 249                (string-match "r-..-..-." (nth 8 attrib)))
 250           'announce
 251         'implicit))))
 252
 253 (defun vc-cvs-mode-line-string (file)
 254   "Return string for placement into the modeline for FILE.
 255 Compared to the default implementation, this function does two things:
 256 Handle the special case of a CVS file that is added but not yet
 257 committed and support display of sticky tags."
 258   (let ((sticky-tag (vc-file-getprop file 'vc-cvs-sticky-tag))
 259         (string (if (string= (vc-workfile-version file) "0")
 260                     ;; A file that is added but not yet committed.
 261                     "CVS @@"
 262                   (vc-default-mode-line-string 'CVS file))))
 263     (if (zerop (length sticky-tag))
 264         string
 265       (concat string "[" sticky-tag "]"))))
 266
 267 (defun vc-cvs-dired-state-info (file)
 268   "CVS-specific version of `vc-dired-state-info'."
 269   (let ((cvs-state (vc-state file)))
 270     (cond ((eq cvs-state 'edited)
 271            (if (equal (vc-workfile-version file) "0")
 272                "(added)" "(modified)"))
 273           ((eq cvs-state 'needs-patch) "(patch)")
 274           ((eq cvs-state 'needs-merge) "(merge)"))))
 275
 276
 277 ;;;
 278 ;;; State-changing functions
 279 ;;;
 280
 281 (defun vc-cvs-register (file &optional rev comment)
 282   "Register FILE into the CVS version-control system.
 283 COMMENT can be used to provide an initial description of FILE.
 284
 285 `vc-register-switches' and `vc-cvs-register-switches' are passed to
 286 the CVS command (in that order)."
 287   (when (and (not (vc-cvs-responsible-p file))
 288              (vc-cvs-could-register file))
 289     ;; Register the directory if needed.
 290     (vc-cvs-register (directory-file-name (file-name-directory file))))
 291   (apply 'vc-cvs-command nil 0 file
 292          "add"
 293          (and comment (string-match "[^\t\n ]" comment)
 294               (concat "-m" comment))
 295          (vc-switches 'CVS 'register)))
 296
 297 (defun vc-cvs-responsible-p (file)
 298   "Return non-nil if CVS thinks it is responsible for FILE."
 299   (file-directory-p (expand-file-name "CVS"
 300                                       (if (file-directory-p file)
 301                                           file
 302                                         (file-name-directory file)))))
 303
 304 (defun vc-cvs-could-register (file)
 305   "Return non-nil if FILE could be registered in CVS.
 306 This is only possible if CVS is managing FILE's directory or one of
 307 its parents."
 308   (let ((dir file))
 309     (while (and (stringp dir)
 310                 (not (equal dir (setq dir (file-name-directory dir))))
 311                 dir)
 312       (setq dir (if (file-directory-p
 313                      (expand-file-name "CVS/Entries" dir))
 314                     t (directory-file-name dir))))
 315     (eq dir t)))
 316
 317 (defun vc-cvs-checkin (file rev comment)
 318   "CVS-specific version of `vc-backend-checkin'."
 319   (unless (or (not rev) (vc-cvs-valid-version-number-p rev))
 320     (if (not (vc-cvs-valid-symbolic-tag-name-p rev))
 321         (error "%s is not a valid symbolic tag name" rev)
 322       ;; If the input revison is a valid symbolic tag name, we create it
 323       ;; as a branch, commit and switch to it.
 324       (apply 'vc-cvs-command nil 0 file "tag" "-b" (list rev))
 325       (apply 'vc-cvs-command nil 0 file "update" "-r" (list rev))
 326       (vc-file-setprop file 'vc-cvs-sticky-tag rev)))
 327   (let ((status (apply 'vc-cvs-command nil 1 file
 328                        "ci" (if rev (concat "-r" rev))
 329                        (concat "-m" comment)
 330                        (vc-switches 'CVS 'checkin))))
 331     (set-buffer "*vc*")
 332     (goto-char (point-min))
 333     (when (not (zerop status))
 334       ;; Check checkin problem.
 335       (cond
 336        ((re-search-forward "Up-to-date check failed" nil t)
 337         (vc-file-setprop file 'vc-state 'needs-merge)
 338         (error (substitute-command-keys
 339                 (concat "Up-to-date check failed: "
 340                         "type \\[vc-next-action] to merge in changes"))))
 341        (t
 342         (pop-to-buffer (current-buffer))
 343         (goto-char (point-min))
 344         (shrink-window-if-larger-than-buffer)
 345         (error "Check-in failed"))))
 346     ;; Update file properties
 347     (vc-file-setprop
 348      file 'vc-workfile-version
 349      (vc-parse-buffer "^\\(new\\|initial\\) revision: \\([0-9.]+\\)" 2))
 350     ;; Forget the checkout model of the file, because we might have
 351     ;; guessed wrong when we found the file.  After commit, we can
 352     ;; tell it from the permissions of the file (see
 353     ;; vc-cvs-checkout-model).
 354     (vc-file-setprop file 'vc-checkout-model nil)
 355
 356     ;; if this was an explicit check-in (does not include creation of
 357     ;; a branch), remove the sticky tag.
 358     (if (and rev (not (vc-cvs-valid-symbolic-tag-name-p rev)))
 359         (vc-cvs-command nil 0 file "update" "-A"))))
 360
 361 (defun vc-cvs-find-version (file rev buffer)
 362   (apply 'vc-cvs-command
 363          buffer 0 file
 364          "-Q"                           ; suppress diagnostic output
 365          "update"
 366          (and rev (not (string= rev ""))
 367               (concat "-r" rev))
 368          "-p"
 369          (vc-switches 'CVS 'checkout)))
 370
 371 (defun vc-cvs-checkout (file &optional editable rev workfile)
 372   "Retrieve a revision of FILE into a WORKFILE.
 373 EDITABLE non-nil means that the file should be writable.
 374 REV is the revision to check out into WORKFILE."
 375   (let ((filename (or workfile file))
 376         (file-buffer (get-file-buffer file))
 377         switches)
 378     (message "Checking out %s..." filename)
 379     (save-excursion
 380       ;; Change buffers to get local value of vc-checkout-switches.
 381       (if file-buffer (set-buffer file-buffer))
 382       (setq switches (vc-switches 'CVS 'checkout))
 383       ;; Save this buffer's default-directory
 384       ;; and use save-excursion to make sure it is restored
 385       ;; in the same buffer it was saved in.
 386       (let ((default-directory default-directory))
 387         (save-excursion
 388           ;; Adjust the default-directory so that the check-out creates
 389           ;; the file in the right place.
 390           (setq default-directory (file-name-directory filename))
 391           (if workfile
 392               (let ((failed t)
 393                     (backup-name (if (string= file workfile)
 394                                      (car (find-backup-file-name filename)))))
 395                 (when backup-name
 396                   (copy-file filename backup-name
 397                              'ok-if-already-exists 'keep-date)
 398                   (unless (file-writable-p filename)
 399                     (set-file-modes filename
 400                                     (logior (file-modes filename) 128))))
 401                 (unwind-protect
 402                     (progn
 403                       (let ((coding-system-for-read 'no-conversion)
 404                             (coding-system-for-write 'no-conversion))
 405                         (with-temp-file filename
 406                           (apply 'vc-cvs-command
 407                                  (current-buffer) 0 file
 408                                  "-Q"   ; suppress diagnostic output
 409                                  "update"
 410                                  (and (stringp rev)
 411                                       (not (string= rev ""))
 412                                       (concat "-r" rev))
 413                                  "-p"
 414                                  switches)))
 415                       (setq failed nil))
 416                   (if failed
 417                       (if backup-name
 418                           (rename-file backup-name filename
 419                                        'ok-if-already-exists)
 420                         (if (file-exists-p filename)
 421                             (delete-file filename)))
 422                     (and backup-name
 423                          (not vc-make-backup-files)
 424                          (delete-file backup-name)))))
 425             (if (and (file-exists-p file) (not rev))
 426                 ;; If no revision was specified, just make the file writable
 427                 ;; if necessary (using `cvs-edit' if requested).
 428                 (and editable (not (eq (vc-cvs-checkout-model file) 'implicit))
 429                      (if vc-cvs-use-edit
 430                          (vc-cvs-command nil 0 file "edit")
 431                        (set-file-modes file (logior (file-modes file) 128))
 432                        (if file-buffer (toggle-read-only -1))))
 433               ;; Check out a particular version (or recreate the file).
 434               (vc-file-setprop file 'vc-workfile-version nil)
 435               (apply 'vc-cvs-command nil 0 file
 436                      (and editable
 437                           (or (not (file-exists-p file))
 438                               (not (eq (vc-cvs-checkout-model file)
 439                                        'implicit)))
 440                           "-w")
 441                      "update"
 442                      (when rev
 443                        (unless (eq rev t)
 444                          ;; default for verbose checkout: clear the
 445                          ;; sticky tag so that the actual update will
 446                          ;; get the head of the trunk
 447                          (if (string= rev "")
 448                              "-A"
 449                            (concat "-r" rev))))
 450                      switches))))
 451         (vc-mode-line file)
 452         (message "Checking out %s...done" filename)))))
 453
 454 (defun vc-cvs-delete-file (file)
 455   (vc-cvs-command nil 0 file "remove" "-f"))
 456
 457 (defun vc-cvs-revert (file &optional contents-done)
 458   "Revert FILE to the version it was based on."
 459   (unless contents-done
 460     ;; Check out via standard output (caused by the final argument
 461     ;; FILE below), so that no sticky tag is set.
 462     (vc-cvs-checkout file nil (vc-workfile-version file) file))
 463   (unless (eq (vc-checkout-model file) 'implicit)
 464     (if vc-cvs-use-edit
 465         (vc-cvs-command nil 0 file "unedit")
 466       ;; Make the file read-only by switching off all w-bits
 467       (set-file-modes file (logand (file-modes file) 3950)))))
 468
 469 (defun vc-cvs-merge (file first-version &optional second-version)
 470   "Merge changes into current working copy of FILE.
 471 The changes are between FIRST-VERSION and SECOND-VERSION."
 472   (vc-cvs-command nil 0 file
 473                  "update" "-kk"
 474                  (concat "-j" first-version)
 475                  (concat "-j" second-version))
 476   (vc-file-setprop file 'vc-state 'edited)
 477   (with-current-buffer (get-buffer "*vc*")
 478     (goto-char (point-min))
 479     (if (re-search-forward "conflicts during merge" nil t)
 480         1                               ; signal error
 481       0)))                              ; signal success
 482
 483 (defun vc-cvs-merge-news (file)
 484   "Merge in any new changes made to FILE."
 485   (message "Merging changes into %s..." file)
 486   ;; (vc-file-setprop file 'vc-workfile-version nil)
 487   (vc-file-setprop file 'vc-checkout-time 0)
 488   (vc-cvs-command nil 0 file "update")
 489   ;; Analyze the merge result reported by CVS, and set
 490   ;; file properties accordingly.
 491   (with-current-buffer (get-buffer "*vc*")
 492     (goto-char (point-min))
 493     ;; get new workfile version
 494     (if (re-search-forward
 495          "^Merging differences between [0-9.]* and \\([0-9.]*\\) into" nil t)
 496         (vc-file-setprop file 'vc-workfile-version (match-string 1))
 497       (vc-file-setprop file 'vc-workfile-version nil))
 498     ;; get file status
 499     (prog1
 500         (if (eq (buffer-size) 0)
 501             0 ;; there were no news; indicate success
 502           (if (re-search-forward
 503                (concat "^\\([CMUP] \\)?"
 504                        (regexp-quote (file-name-nondirectory file))
 505                        "\\( already contains the differences between \\)?")
 506                nil t)
 507               (cond
 508                ;; Merge successful, we are in sync with repository now
 509                ((or (match-string 2)
 510                     (string= (match-string 1) "U ")
 511                     (string= (match-string 1) "P "))
 512                 (vc-file-setprop file 'vc-state 'up-to-date)
 513                 (vc-file-setprop file 'vc-checkout-time
 514                                  (nth 5 (file-attributes file)))
 515                 0);; indicate success to the caller
 516                ;; Merge successful, but our own changes are still in the file
 517                ((string= (match-string 1) "M ")
 518                 (vc-file-setprop file 'vc-state 'edited)
 519                 0);; indicate success to the caller
 520                ;; Conflicts detected!
 521                (t
 522                 (vc-file-setprop file 'vc-state 'edited)
 523                 1);; signal the error to the caller
 524                )
 525             (pop-to-buffer "*vc*")
 526             (error "Couldn't analyze cvs update result")))
 527       (message "Merging changes into %s...done" file))))
 528
 529
 530 ;;;
 531 ;;; History functions
 532 ;;;
 533
 534 (defun vc-cvs-print-log (file &optional buffer)
 535   "Get change log associated with FILE."
 536   (vc-cvs-command
 537    buffer
 538    (if (and (vc-stay-local-p file) (fboundp 'start-process)) 'async 0)
 539    file "log"))
 540
 541 (defun vc-cvs-diff (file &optional oldvers newvers buffer)
 542   "Get a difference report using CVS between two versions of FILE."
 543   (if (string= (vc-workfile-version file) "0")
 544       ;; This file is added but not yet committed; there is no master file.
 545       (if (or oldvers newvers)
 546           (error "No revisions of %s exist" file)
 547         ;; We regard this as "changed".
 548         ;; Diff it against /dev/null.
 549         ;; Note: this is NOT a "cvs diff".
 550         (apply 'vc-do-command (or buffer "*vc-diff*")
 551                1 "diff" file
 552                (append (vc-switches nil 'diff) '("/dev/null")))
 553         ;; Even if it's empty, it's locally modified.
 554         1)
 555     (let* ((async (and (not vc-disable-async-diff)
 556                        (vc-stay-local-p file)
 557                        (fboundp 'start-process)))
 558            (status (apply 'vc-cvs-command (or buffer "*vc-diff*")
 559                           (if async 'async 1)
 560                           file "diff"
 561                           (and oldvers (concat "-r" oldvers))
 562                           (and newvers (concat "-r" newvers))
 563                           (vc-switches 'CVS 'diff))))
 564       (if async 1 status))))            ; async diff, pessimistic assumption
 565
 566 (defun vc-cvs-diff-tree (dir &optional rev1 rev2)
 567   "Diff all files at and below DIR."
 568   (with-current-buffer "*vc-diff*"
 569     (setq default-directory dir)
 570     (if (vc-stay-local-p dir)
 571         ;; local diff: do it filewise, and only for files that are modified
 572         (vc-file-tree-walk
 573          dir
 574          (lambda (f)
 575            (vc-exec-after
 576             `(let ((coding-system-for-read (vc-coding-system-for-diff ',f)))
 577                ;; possible optimization: fetch the state of all files
 578                ;; in the tree via vc-cvs-dir-state-heuristic
 579                (unless (vc-up-to-date-p ',f)
 580                  (message "Looking at %s" ',f)
 581                  (vc-diff-internal ',f ',rev1 ',rev2))))))
 582       ;; cvs diff: use a single call for the entire tree
 583       (let ((coding-system-for-read
 584              (or coding-system-for-read 'undecided)))
 585         (apply 'vc-cvs-command "*vc-diff*" 1 nil "diff"
 586                (and rev1 (concat "-r" rev1))
 587                (and rev2 (concat "-r" rev2))
 588                (vc-switches 'CVS 'diff))))))
 589
 590 (defun vc-cvs-annotate-command (file buffer &optional version)
 591   "Execute \"cvs annotate\" on FILE, inserting the contents in BUFFER.
 592 Optional arg VERSION is a version to annotate from."
 593   (vc-cvs-command buffer 0 file "annotate" (if version (concat "-r" version)))
 594   (with-current-buffer buffer
 595     (goto-char (point-min))
 596     (re-search-forward "^[0-9]")
 597     (delete-region (point-min) (1- (point)))))
 598
 599 (defun vc-cvs-annotate-current-time ()
 600   "Return the current time, based at midnight of the current day, and
 601 encoded as fractional days."
 602   (vc-annotate-convert-time
 603    (apply 'encode-time 0 0 0 (nthcdr 3 (decode-time (current-time))))))
 604
 605 (defun vc-cvs-annotate-time ()
 606   "Return the time of the next annotation (as fraction of days)
 607 systime, or nil if there is none."
 608   (let* ((bol (point))
 609          (cache (get-text-property bol 'vc-cvs-annotate-time))
 610          buffer-read-only)
 611     (cond
 612      (cache)
 613      ((looking-at
 614        "^\\S-+\\s-+\\S-+\\s-+\\([0-9]+\\)-\\(\\sw+\\)-\\([0-9]+\\)): ")
 615       (let ((day (string-to-number (match-string 1)))
 616             (month (cdr (assq (intern (match-string 2))
 617                               '((Jan .  1) (Feb .  2) (Mar .  3)
 618                                 (Apr .  4) (May .  5) (Jun .  6)
 619                                 (Jul .  7) (Aug .  8) (Sep .  9)
 620                                 (Oct . 10) (Nov . 11) (Dec . 12)))))
 621             (year (let ((tmp (string-to-number (match-string 3))))
 622                     ;; Years 0..68 are 2000..2068.
 623                     ;; Years 69..99 are 1969..1999.
 624                     (+ (cond ((> 69 tmp) 2000)
 625                              ((> 100 tmp) 1900)
 626                              (t 0))
 627                        tmp))))
 628         (put-text-property
 629          bol (1+ bol) 'vc-cvs-annotate-time
 630          (setq cache (cons
 631                       ;; Position at end makes for nicer overlay result.
 632                       (match-end 0)
 633                       (vc-annotate-convert-time
 634                        (encode-time 0 0 0 day month year))))))))
 635     (when cache
 636       (goto-char (car cache))           ; fontify from here to eol
 637       (cdr cache))))                    ; days (float)
 638
 639 (defun vc-cvs-annotate-extract-revision-at-line ()
 640   (save-excursion
 641     (beginning-of-line)
 642     (if (re-search-forward "^\\([0-9]+\\.[0-9]+\\(\\.[0-9]+\\)*\\) +("
 643                            (line-end-position) t)
 644         (match-string-no-properties 1)
 645       nil)))
 646
 647 ;;;
 648 ;;; Snapshot system
 649 ;;;
 650
 651 (defun vc-cvs-create-snapshot (dir name branchp)
 652   "Assign to DIR's current version a given NAME.
 653 If BRANCHP is non-nil, the name is created as a branch (and the current
 654 workspace is immediately moved to that new branch)."
 655   (vc-cvs-command nil 0 dir "tag" "-c" (if branchp "-b") name)
 656   (when branchp (vc-cvs-command nil 0 dir "update" "-r" name)))
 657
 658 (defun vc-cvs-retrieve-snapshot (dir name update)
 659   "Retrieve a snapshot at and below DIR.
 660 NAME is the name of the snapshot; if it is empty, do a `cvs update'.
 661 If UPDATE is non-nil, then update (resynch) any affected buffers."
 662   (with-current-buffer (get-buffer-create "*vc*")
 663     (let ((default-directory dir)
 664           (sticky-tag))
 665       (erase-buffer)
 666       (if (or (not name) (string= name ""))
 667           (vc-cvs-command t 0 nil "update")
 668         (vc-cvs-command t 0 nil "update" "-r" name)
 669         (setq sticky-tag name))
 670       (when update
 671         (goto-char (point-min))
 672         (while (not (eobp))
 673           (if (looking-at "\\([CMUP]\\) \\(.*\\)")
 674               (let* ((file (expand-file-name (match-string 2) dir))
 675                      (state (match-string 1))
 676                      (buffer (find-buffer-visiting file)))
 677                 (when buffer
 678                   (cond
 679                    ((or (string= state "U")
 680                         (string= state "P"))
 681                     (vc-file-setprop file 'vc-state 'up-to-date)
 682                     (vc-file-setprop file 'vc-workfile-version nil)
 683                     (vc-file-setprop file 'vc-checkout-time
 684                                      (nth 5 (file-attributes file))))
 685                    ((or (string= state "M")
 686                         (string= state "C"))
 687                     (vc-file-setprop file 'vc-state 'edited)
 688                     (vc-file-setprop file 'vc-workfile-version nil)
 689                     (vc-file-setprop file 'vc-checkout-time 0)))
 690                   (vc-file-setprop file 'vc-cvs-sticky-tag sticky-tag)
 691                   (vc-resynch-buffer file t t))))
 692           (forward-line 1))))))
 693
 694
 695 ;;;
 696 ;;; Miscellaneous
 697 ;;;
 698
 699 (defalias 'vc-cvs-make-version-backups-p 'vc-stay-local-p
 700   "Return non-nil if version backups should be made for FILE.")
 701
 702 (defun vc-cvs-check-headers ()
 703   "Check if the current file has any headers in it."
 704   (save-excursion
 705     (goto-char (point-min))
 706     (re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\
 707 \\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t)))
 708
 709
 710 ;;;
 711 ;;; Internal functions
 712 ;;;
 713
 714 (defun vc-cvs-command (buffer okstatus file &rest flags)
 715   "A wrapper around `vc-do-command' for use in vc-cvs.el.
 716 The difference to vc-do-command is that this function always invokes `cvs',
 717 and that it passes `vc-cvs-global-switches' to it before FLAGS."
 718   (apply 'vc-do-command buffer okstatus "cvs" file
 719          (if (stringp vc-cvs-global-switches)
 720              (cons vc-cvs-global-switches flags)
 721            (append vc-cvs-global-switches
 722                    flags))))
 723
 724 (defalias 'vc-cvs-stay-local-p 'vc-stay-local-p)  ;Back-compatibility.
 725
 726 (defun vc-cvs-repository-hostname (dirname)
 727   "Hostname of the CVS server associated to workarea DIRNAME."
 728   (let ((rootname (expand-file-name "CVS/Root" dirname)))
 729     (when (file-readable-p rootname)
 730       (with-temp-buffer
 731         (let ((coding-system-for-read
 732                (or file-name-coding-system
 733                    default-file-name-coding-system)))
 734           (vc-insert-file rootname))
 735         (goto-char (point-min))
 736         (nth 2 (vc-cvs-parse-root
 737                 (buffer-substring (point)
 738                                   (line-end-position))))))))
 739
 740 (defun vc-cvs-parse-root (root)
 741   "Split CVS ROOT specification string into a list of fields.
 742 A CVS root specification of the form
 743   [:METHOD:][[USER@]HOSTNAME:]/path/to/repository
 744 is converted to a normalized record with the following structure:
 745   \(METHOD USER HOSTNAME CVS-ROOT).
 746 The default METHOD for a CVS root of the form
 747   /path/to/repository
 748 is `local'.
 749 The default METHOD for a CVS root of the form
 750   [USER@]HOSTNAME:/path/to/repository
 751 is `ext'.
 752 For an empty string, nil is returned (invalid CVS root)."
 753   ;; Split CVS root into colon separated fields (0-4).
 754   ;; The `x:' makes sure, that leading colons are not lost;
 755   ;; `HOST:/PATH' is then different from `:METHOD:/PATH'.
 756   (let* ((root-list (cdr (split-string (concat "x:" root) ":")))
 757          (len (length root-list))
 758          ;; All syntactic varieties will get a proper METHOD.
 759          (root-list
 760           (cond
 761            ((= len 0)
 762             ;; Invalid CVS root
 763             nil)
 764            ((= len 1)
 765             ;; Simple PATH => method `local'
 766             (cons "local"
 767                   (cons nil root-list)))
 768            ((= len 2)
 769             ;; [USER@]HOST:PATH => method `ext'
 770             (and (not (equal (car root-list) ""))
 771                  (cons "ext" root-list)))
 772            ((= len 3)
 773             ;; :METHOD:PATH
 774             (cons (cadr root-list)
 775                   (cons nil (cddr root-list))))
 776            (t
 777             ;; :METHOD:[USER@]HOST:PATH
 778             (cdr root-list)))))
 779     (if root-list
 780         (let ((method (car root-list))
 781               (uhost (or (cadr root-list) ""))
 782               (root (nth 2 root-list))
 783               user host)
 784           ;; Split USER@HOST
 785           (if (string-match "\\(.*\\)@\\(.*\\)" uhost)
 786               (setq user (match-string 1 uhost)
 787                     host (match-string 2 uhost))
 788             (setq host uhost))
 789           ;; Remove empty HOST
 790           (and (equal host "")
 791                (setq host))
 792           ;; Fix windows style CVS root `:local:C:\\project\\cvs\\some\\dir'
 793           (and host
 794                (equal method "local")
 795                (setq root (concat host ":" root) host))
 796           ;; Normalize CVS root record
 797           (list method user host root)))))
 798
 799 (defun vc-cvs-parse-status (&optional full)
 800   "Parse output of \"cvs status\" command in the current buffer.
 801 Set file properties accordingly.  Unless FULL is t, parse only
 802 essential information."
 803   (let (file status)
 804     (goto-char (point-min))
 805     (if (re-search-forward "^File: " nil t)
 806         (cond
 807          ((looking-at "no file") nil)
 808          ((re-search-forward "\\=\\([^ \t]+\\)" nil t)
 809           (setq file (expand-file-name (match-string 1)))
 810           (vc-file-setprop file 'vc-backend 'CVS)
 811           (if (not (re-search-forward "\\=[ \t]+Status: \\(.*\\)" nil t))
 812               (setq status "Unknown")
 813             (setq status (match-string 1)))
 814           (if (and full
 815                    (re-search-forward
 816                     "\\(RCS Version\\|RCS Revision\\|Repository revision\\):\
 817 \[\t ]+\\([0-9.]+\\)"
 818                     nil t))
 819               (vc-file-setprop file 'vc-latest-version (match-string 2)))
 820           (vc-file-setprop
 821            file 'vc-state
 822            (cond
 823             ((string-match "Up-to-date" status)
 824              (vc-file-setprop file 'vc-checkout-time
 825                               (nth 5 (file-attributes file)))
 826              'up-to-date)
 827             ((string-match "Locally Modified" status)             'edited)
 828             ((string-match "Needs Merge" status)                  'needs-merge)
 829             ((string-match "Needs \\(Checkout\\|Patch\\)" status) 'needs-patch)
 830             (t 'edited))))))))
 831
 832 (defun vc-cvs-dir-state-heuristic (dir)
 833   "Find the CVS state of all files in DIR, using only local information."
 834   (with-temp-buffer
 835     (vc-cvs-get-entries dir)
 836     (goto-char (point-min))
 837     (while (not (eobp))
 838       ;; CVS-removed files are not taken under VC control.
 839       (when (looking-at "/\\([^/]*\\)/[^/-]")
 840         (let ((file (expand-file-name (match-string 1) dir)))
 841           (unless (vc-file-getprop file 'vc-state)
 842             (vc-cvs-parse-entry file t))))
 843       (forward-line 1))))
 844
 845 (defun vc-cvs-get-entries (dir)
 846   "Insert the CVS/Entries file from below DIR into the current buffer.
 847 This function ensures that the correct coding system is used for that,
 848 which may not be the one that is used for the files' contents.
 849 CVS/Entries should only be accessed through this function."
 850   (let ((coding-system-for-read (or file-name-coding-system
 851                                     default-file-name-coding-system)))
 852     (vc-insert-file (expand-file-name "CVS/Entries" dir))))
 853
 854 (defun vc-cvs-valid-symbolic-tag-name-p (tag)
 855   "Return non-nil if TAG is a valid symbolic tag name."
 856   ;; According to the CVS manual, a valid symbolic tag must start with
 857   ;; an uppercase or lowercase letter and can contain uppercase and
 858   ;; lowercase letters, digits, `-', and `_'.
 859   (and (string-match "^[a-zA-Z]" tag)
 860        (not (string-match "[^a-z0-9A-Z-_]" tag))))
 861
 862 (defun vc-cvs-valid-version-number-p (tag)
 863   "Return non-nil if TAG is a valid version number."
 864   (and (string-match "^[0-9]" tag)
 865        (not (string-match "[^0-9.]" tag))))
 866
 867 (defun vc-cvs-parse-sticky-tag (match-type match-tag)
 868   "Parse and return the sticky tag as a string.
 869 `match-data' is protected."
 870   (let ((data (match-data))
 871         (tag)
 872         (type (cond ((string= match-type "D") 'date)
 873                     ((string= match-type "T")
 874                      (if (vc-cvs-valid-symbolic-tag-name-p match-tag)
 875                          'symbolic-name
 876                        'revision-number))
 877                     (t nil))))
 878     (unwind-protect
 879         (progn
 880           (cond
 881            ;; Sticky Date tag.  Convert to a proper date value (`encode-time')
 882            ((eq type 'date)
 883             (string-match
 884              "\\([0-9]+\\)\\.\\([0-9]+\\)\\.\\([0-9]+\\)\\.\\([0-9]+\\)\\.\\([0-9]+\\)\\.\\([0-9]+\\)"
 885              match-tag)
 886             (let* ((year-tmp (string-to-number (match-string 1 match-tag)))
 887                    (month    (string-to-number (match-string 2 match-tag)))
 888                    (day      (string-to-number (match-string 3 match-tag)))
 889                    (hour     (string-to-number (match-string 4 match-tag)))
 890                    (min      (string-to-number (match-string 5 match-tag)))
 891                    (sec      (string-to-number (match-string 6 match-tag)))
 892                    ;; Years 0..68 are 2000..2068.
 893                    ;; Years 69..99 are 1969..1999.
 894                    (year (+ (cond ((> 69 year-tmp) 2000)
 895                                   ((> 100 year-tmp) 1900)
 896                                   (t 0))
 897                             year-tmp)))
 898               (setq tag (encode-time sec min hour day month year))))
 899            ;; Sticky Tag name or revision number
 900            ((eq type 'symbolic-name) (setq tag match-tag))
 901            ((eq type 'revision-number) (setq tag match-tag))
 902            ;; Default is no sticky tag at all
 903            (t nil))
 904           (cond ((eq vc-cvs-sticky-tag-display nil) nil)
 905                 ((eq vc-cvs-sticky-tag-display t)
 906                  (cond ((eq type 'date) (format-time-string
 907                                          vc-cvs-sticky-date-format-string
 908                                          tag))
 909                        ((eq type 'symbolic-name) tag)
 910                        ((eq type 'revision-number) tag)
 911                        (t nil)))
 912                 ((functionp vc-cvs-sticky-tag-display)
 913                  (funcall vc-cvs-sticky-tag-display tag type))
 914                 (t nil)))
 915
 916       (set-match-data data))))
 917
 918 (defun vc-cvs-parse-entry (file &optional set-state)
 919   "Parse a line from CVS/Entries.
 920 Compare modification time to that of the FILE, set file properties
 921 accordingly.  However, `vc-state' is set only if optional arg SET-STATE
 922 is non-nil."
 923   (cond
 924    ;; entry for a "locally added" file (not yet committed)
 925    ((looking-at "/[^/]+/0/")
 926     (vc-file-setprop file 'vc-checkout-time 0)
 927     (vc-file-setprop file 'vc-workfile-version "0")
 928     (if set-state (vc-file-setprop file 'vc-state 'edited)))
 929    ;; normal entry
 930    ((looking-at
 931      (concat "/[^/]+"
 932              ;; revision
 933              "/\\([^/]*\\)"
 934              ;; timestamp and optional conflict field
 935              "/\\([^/]*\\)/"
 936              ;; options
 937              "\\([^/]*\\)/"
 938              ;; sticky tag
 939              "\\(.\\|\\)" ;Sticky tag type (date or tag name, could be empty)
 940              "\\(.*\\)"))               ;Sticky tag
 941     (vc-file-setprop file 'vc-workfile-version (match-string 1))
 942     (vc-file-setprop file 'vc-cvs-sticky-tag
 943                      (vc-cvs-parse-sticky-tag (match-string 4)
 944                                               (match-string 5)))
 945     ;; Compare checkout time and modification time.
 946     ;; This is intentionally different from the algorithm that CVS uses
 947     ;; (which is based on textual comparison), because there can be problems
 948     ;; generating a time string that looks exactly like the one from CVS.
 949     (let ((mtime (nth 5 (file-attributes file))))
 950       (require 'parse-time)
 951       (let ((parsed-time
 952              (parse-time-string (concat (match-string 2) " +0000"))))
 953         (cond ((and (not (string-match "\\+" (match-string 2)))
 954                     (car parsed-time)
 955                     (equal mtime (apply 'encode-time parsed-time)))
 956                (vc-file-setprop file 'vc-checkout-time mtime)
 957                (if set-state (vc-file-setprop file 'vc-state 'up-to-date)))
 958               (t
 959                (vc-file-setprop file 'vc-checkout-time 0)
 960                (if set-state (vc-file-setprop file 'vc-state 'edited)))))))))
 961
 962 (provide 'vc-cvs)
 963
 964 ;;; arch-tag: 60e1402a-aa53-4607-927a-cf74f144b432
 965 ;;; vc-cvs.el ends here