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emacs/lisp/vc-mcvs.el
Stefan Monnier 3928b9a693 Initial version.
2003-04-20 00:02:37 +00:00

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;;; vc-mcvs.el --- VC backend for the Meta-CVS version-control system
;; Copyright (C) 1995,98,99,2000,01,02,2003 Free Software Foundation, Inc.
;; Author: FSF (see vc.el for full credits)
;; Maintainer: Stefan Monnier <monnier@gnu.org>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This is derived from vc-cvs.el as follows:
;; - cp vc-cvs.el vc-mcvs.el
;; - Replace CVS/ with MCVS/CVS/
;; - Replace 'CVS with 'MCVS
;; - Replace -cvs- with -mcvs-
;; - Replace most of the rest of CVS to Meta-CVS
;;
;; Then of course started the hacking. Only a small part of the code
;; has been touched and not much more than that was tested, so if
;; you bump into a bug, don't be surprised: just report it to me.
;;
;; What has been partly tested:
;; - C-x v v to start editing a file that was checked out with CVSREAD on.
;; - C-x v v to commit a file
;; - C-x v =
;; - C-x v l
;; - C-x v i
;; - C-x v g
;;; Bugs:
;; - Both the diff and log output contain Meta-CVS inode names so that
;; several operations in those buffers don't work as advertised.
;; - VC-dired doesn't work.
;;; Code:
(eval-when-compile (require 'vc))
(require 'vc-cvs)
;;;
;;; Customization options
;;;
(defcustom vc-mcvs-global-switches nil
"*Global switches to pass to any Meta-CVS command."
:type '(choice (const :tag "None" nil)
(string :tag "Argument String")
(repeat :tag "Argument List"
:value ("")
string))
:version "21.4"
:group 'vc)
(defcustom vc-mcvs-register-switches nil
"*Extra switches for registering a file into Meta-CVS.
A string or list of strings passed to the checkin program by
\\[vc-register]."
:type '(choice (const :tag "None" nil)
(string :tag "Argument String")
(repeat :tag "Argument List"
:value ("")
string))
:version "21.4"
:group 'vc)
(defcustom vc-mcvs-diff-switches nil
"*A string or list of strings specifying extra switches for cvs diff under VC."
:type '(choice (const :tag "None" nil)
(string :tag "Argument String")
(repeat :tag "Argument List"
:value ("")
string))
:version "21.4"
:group 'vc)
(defcustom vc-mcvs-header (or (cdr (assoc 'MCVS vc-header-alist))
vc-cvs-header)
"*Header keywords to be inserted by `vc-insert-headers'."
:version "21.4"
:type '(repeat string)
:group 'vc)
(defcustom vc-mcvs-use-edit vc-cvs-use-edit
"*Non-nil means to use `cvs edit' to \"check out\" a file.
This is only meaningful if you don't use the implicit checkout model
\(i.e. if you have $CVSREAD set)."
:type 'boolean
:version "21.4"
:group 'vc)
(defcustom vc-mcvs-stay-local vc-cvs-stay-local
"*Non-nil means use local operations when possible for remote repositories.
This avoids slow queries over the network and instead uses heuristics
and past information to determine the current status of a file.
The value can also be a regular expression to match against the host name
of a repository; then VC only stays local for hosts that match it."
:type '(choice (const :tag "Always stay local" t)
(string :tag "Host regexp")
(const :tag "Don't stay local" nil))
:version "21.4"
:group 'vc)
;;;
;;; State-querying functions
;;;
;;;###autoload (defun vc-mcvs-registered (file)
;;;###autoload (let ((dir file))
;;;###autoload (while (and (stringp dir)
;;;###autoload (not (equal dir (setq dir (file-name-directory dir)))))
;;;###autoload (setq dir (if (file-directory-p
;;;###autoload (expand-file-name "MCVS/CVS" dir))
;;;###autoload t (directory-file-name dir))))
;;;###autoload (if (eq dir t)
;;;###autoload (progn
;;;###autoload (load "vc-mcvs")
;;;###autoload (vc-mcvs-registered file)))))
(defun vc-mcvs-root (file)
"Return the root directory of a Meta-CVS project, if any."
(let ((root nil))
(while (not (or root (equal file (setq file (file-name-directory file)))))
(if (file-directory-p (expand-file-name "MCVS/CVS" file))
(setq root file)
(setq file (directory-file-name file))))
root))
(defun vc-mcvs-read (file)
(with-temp-buffer
(insert-file-contents file)
(goto-char (point-min))
(read (current-buffer))))
(defun vc-mcvs-map-file (dir file)
(let ((map (vc-mcvs-read (expand-file-name "MCVS/MAP" dir)))
inode)
(dolist (x map inode)
(if (equal (nth 2 x) file) (setq inode (nth 1 x))))))
(defun vc-mcvs-registered (file)
(let (root inode cvsfile)
(when (and (setq root (vc-mcvs-root file))
(setq inode (vc-mcvs-map-file
root (substring file (length root)))))
(vc-file-setprop file 'mcvs-inode inode)
(vc-file-setprop file 'mcvs-root root)
;; Avoid calling `mcvs diff' in vc-workfile-unchanged-p.
(vc-file-setprop file 'vc-checkout-time
(if (vc-cvs-registered
(setq cvsfile (expand-file-name inode root)))
(vc-file-getprop cvsfile 'vc-checkout-time)
;; The file might not be registered yet because
;; of lazy-adding.
0))
t)))
(defmacro vc-mcvs-cvs (op file &rest args)
(declare (debug t))
`(,(intern (concat "vc-cvs-" (symbol-name op)))
(expand-file-name (vc-file-getprop ,file 'mcvs-inode)
(vc-file-getprop ,file 'mcvs-root))
,@args))
(defun vc-mcvs-state (file)
;; This would assume the Meta-CVS sandbox is synchronized.
;; (vc-mcvs-cvs state file))
"Meta-CVS-specific version of `vc-state'."
(if (vc-mcvs-stay-local-p file)
(let ((state (vc-file-getprop file 'vc-state)))
;; If we should stay local, use the heuristic but only if
;; we don't have a more precise state already available.
(if (memq state '(up-to-date edited))
(vc-mcvs-state-heuristic file)
state))
(with-temp-buffer
(cd (file-name-directory file))
(vc-mcvs-command t 0 file "status")
(vc-cvs-parse-status t))))
(defalias 'vc-mcvs-state-heuristic 'vc-cvs-state-heuristic)
(defun vc-mcvs-dir-state (dir)
"Find the Meta-CVS state of all files in DIR."
;; if DIR is not under Meta-CVS control, don't do anything.
(when (file-readable-p (expand-file-name "MCVS/CVS/Entries" dir))
(if (vc-mcvs-stay-local-p dir)
(vc-mcvs-dir-state-heuristic dir)
(let ((default-directory dir))
;; Don't specify DIR in this command, the default-directory is
;; enough. Otherwise it might fail with remote repositories.
(with-temp-buffer
(vc-mcvs-command t 0 nil "status" "-l")
(goto-char (point-min))
(while (re-search-forward "^=+\n\\([^=\n].*\n\\|\n\\)+" nil t)
(narrow-to-region (match-beginning 0) (match-end 0))
(vc-cvs-parse-status)
(goto-char (point-max))
(widen)))))))
(defun vc-mcvs-workfile-version (file) (vc-mcvs-cvs workfile-version file))
(defalias 'vc-mcvs-checkout-model 'vc-cvs-checkout-model)
(defun vc-mcvs-mode-line-string (file) (vc-mcvs-cvs mode-line-string file))
;;;
;;; State-changing functions
;;;
(defun vc-mcvs-register (file &optional rev comment)
"Register FILE into the Meta-CVS version-control system.
COMMENT can be used to provide an initial description of FILE.
`vc-register-switches' and `vc-mcvs-register-switches' are passed to
the Meta-CVS command (in that order)."
(let* ((filename (file-name-nondirectory file))
(extpos (string-match "\\." filename))
(ext (if extpos (substring filename (1+ extpos))))
(root (vc-mcvs-root file))
(types-file (expand-file-name "MCVS/TYPES" root))
(map-file (expand-file-name "MCVS/MAP" root))
(types (vc-mcvs-read types-file)))
;; Make sure meta files like MCVS/MAP are not read-only (happens with
;; CVSREAD) since Meta-CVS doesn't pay attention to it at all and goes
;; belly-up.
(unless (file-writable-p map-file)
(vc-checkout map-file t))
(unless (file-writable-p types-file)
(vc-checkout types-file t))
;; Make sure the `mcvs add' will not fire up the CVSEDITOR
;; to add a rule for the given file's extension.
(when (and ext (not (assoc ext types)))
(let ((type (completing-read "Type to use [default]: "
'("default" "name-only" "keep-old"
"binary" "value-only")
nil t nil nil "default")))
(push (list ext (make-symbol (upcase (concat ":" type)))) types)
(setq types (sort types (lambda (x y) (string< (car x) (car y)))))
(with-current-buffer (find-file-noselect types-file)
(if buffer-read-only (vc-checkout buffer-file-name t))
(erase-buffer)
(pp types (current-buffer))
(save-buffer)
(unless (get-buffer-window (current-buffer) t)
(kill-buffer (current-buffer)))))))
;; Now do the ADD.
(let ((switches (append
(if (stringp vc-register-switches)
(list vc-register-switches)
vc-register-switches)
(if (stringp vc-mcvs-register-switches)
(list vc-mcvs-register-switches)
vc-mcvs-register-switches))))
(prog1 (apply 'vc-mcvs-command nil 0 file
"add"
(and comment (string-match "[^\t\n ]" comment)
(concat "-m" comment))
switches)
;; I'm not sure exactly why, but if we don't setup the inode and root
;; prop of the file, things break later on in vc-mode-line that
;; ends up calling vc-mcvs-workfile-version.
(vc-mcvs-registered file)
;; We also need to set vc-checkout-time so that vc-workfile-unchanged-p
;; doesn't try to call `mcvs diff' on the file.
(vc-file-setprop file 'vc-checkout-time 0))))
(defalias 'vc-mcvs-responsible-p 'vc-mcvs-root
"Return non-nil if CVS thinks it is responsible for FILE.")
(defalias 'vc-cvs-could-register 'vc-cvs-responsible-p
"Return non-nil if FILE could be registered in Meta-CVS.
This is only possible if Meta-CVS is responsible for FILE's directory.")
(defun vc-mcvs-checkin (file rev comment)
"Meta-CVS-specific version of `vc-backend-checkin'."
(let ((switches (if (stringp vc-checkin-switches)
(list vc-checkin-switches)
vc-checkin-switches))
status)
(if (or (not rev) (vc-mcvs-valid-version-number-p rev))
(setq status (apply 'vc-mcvs-command nil 1 file
"ci" (if rev (concat "-r" rev))
"-m" comment
switches))
(if (not (vc-mcvs-valid-symbolic-tag-name-p rev))
(error "%s is not a valid symbolic tag name" rev)
;; If the input revison is a valid symbolic tag name, we create it
;; as a branch, commit and switch to it.
(apply 'vc-mcvs-command nil 0 file "tag" "-b" (list rev))
(apply 'vc-mcvs-command nil 0 file "update" "-r" (list rev))
(setq status (apply 'vc-mcvs-command nil 1 file
"ci"
"-m" comment
switches))
(vc-file-setprop file 'vc-mcvs-sticky-tag rev)))
(set-buffer "*vc*")
(goto-char (point-min))
(when (not (zerop status))
;; Check checkin problem.
(cond
((re-search-forward "Up-to-date check failed" nil t)
(vc-file-setprop file 'vc-state 'needs-merge)
(error (substitute-command-keys
(concat "Up-to-date check failed: "
"type \\[vc-next-action] to merge in changes"))))
(t
(pop-to-buffer (current-buffer))
(goto-char (point-min))
(shrink-window-if-larger-than-buffer)
(error "Check-in failed"))))
;; Update file properties
(vc-file-setprop
file 'vc-workfile-version
(vc-parse-buffer "^\\(new\\|initial\\) revision: \\([0-9.]+\\)" 2))
;; Forget the checkout model of the file, because we might have
;; guessed wrong when we found the file. After commit, we can
;; tell it from the permissions of the file (see
;; vc-mcvs-checkout-model).
(vc-file-setprop file 'vc-checkout-model nil)
;; if this was an explicit check-in (does not include creation of
;; a branch), remove the sticky tag.
(if (and rev (not (vc-mcvs-valid-symbolic-tag-name-p rev)))
(vc-mcvs-command nil 0 file "update" "-A"))))
(defun vc-mcvs-find-version (file rev buffer)
(apply 'vc-mcvs-command
buffer 0 file
"-Q" ; suppress diagnostic output
"update"
(and rev (not (string= rev ""))
(concat "-r" rev))
"-p"
(if (stringp vc-checkout-switches)
(list vc-checkout-switches)
vc-checkout-switches)))
(defun vc-mcvs-checkout (file &optional editable rev)
(message "Checking out %s..." file)
(with-current-buffer (or (get-file-buffer file) (current-buffer))
(let ((switches (if (stringp vc-checkout-switches)
(list vc-checkout-switches)
vc-checkout-switches)))
(vc-call update file editable rev switches)))
(vc-mode-line file)
(message "Checking out %s...done" file))
(defun vc-mcvs-update (file editable rev switches)
(if (and (file-exists-p file) (not rev))
;; If no revision was specified, just make the file writable
;; if necessary (using `cvs-edit' if requested).
(and editable (not (eq (vc-mcvs-checkout-model file) 'implicit))
(if vc-mcvs-use-edit
(vc-mcvs-command nil 0 file "edit")
(set-file-modes file (logior (file-modes file) 128))
(if (equal file buffer-file-name) (toggle-read-only -1))))
;; Check out a particular version (or recreate the file).
(vc-file-setprop file 'vc-workfile-version nil)
(apply 'vc-mcvs-command nil 0 file
(if editable "-w")
"update"
;; default for verbose checkout: clear the sticky tag so
;; that the actual update will get the head of the trunk
(if (or (not rev) (string= rev ""))
"-A"
(concat "-r" rev))
switches)))
(defun vc-mcvs-revert (file &optional contents-done)
"Revert FILE to the version it was based on."
(vc-default-revert file contents-done)
(unless (eq (vc-checkout-model file) 'implicit)
(if vc-mcvs-use-edit
(vc-mcvs-command nil 0 file "unedit")
;; Make the file read-only by switching off all w-bits
(set-file-modes file (logand (file-modes file) 3950)))))
(defun vc-mcvs-merge (file first-version &optional second-version)
"Merge changes into current working copy of FILE.
The changes are between FIRST-VERSION and SECOND-VERSION."
(vc-mcvs-command nil 0 file
"update" "-kk"
(concat "-j" first-version)
(concat "-j" second-version))
(vc-file-setprop file 'vc-state 'edited)
(with-current-buffer (get-buffer "*vc*")
(goto-char (point-min))
(if (re-search-forward "conflicts during merge" nil t)
1 ; signal error
0))) ; signal success
(defun vc-mcvs-merge-news (file)
"Merge in any new changes made to FILE."
(message "Merging changes into %s..." file)
;; (vc-file-setprop file 'vc-workfile-version nil)
(vc-file-setprop file 'vc-checkout-time 0)
(vc-mcvs-command nil 0 file "update")
;; Analyze the merge result reported by Meta-CVS, and set
;; file properties accordingly.
(with-current-buffer (get-buffer "*vc*")
(goto-char (point-min))
;; get new workfile version
(if (re-search-forward
"^Merging differences between [0-9.]* and \\([0-9.]*\\) into" nil t)
(vc-file-setprop file 'vc-workfile-version (match-string 1))
(vc-file-setprop file 'vc-workfile-version nil))
;; get file status
(prog1
(if (eq (buffer-size) 0)
0 ;; there were no news; indicate success
(if (re-search-forward
(concat "^\\([CMUP] \\)?"
".*"
"\\( already contains the differences between \\)?")
nil t)
(cond
;; Merge successful, we are in sync with repository now
((or (match-string 2)
(string= (match-string 1) "U ")
(string= (match-string 1) "P "))
(vc-file-setprop file 'vc-state 'up-to-date)
(vc-file-setprop file 'vc-checkout-time
(nth 5 (file-attributes file)))
0);; indicate success to the caller
;; Merge successful, but our own changes are still in the file
((string= (match-string 1) "M ")
(vc-file-setprop file 'vc-state 'edited)
0);; indicate success to the caller
;; Conflicts detected!
(t
(vc-file-setprop file 'vc-state 'edited)
1);; signal the error to the caller
)
(pop-to-buffer "*vc*")
(error "Couldn't analyze mcvs update result")))
(message "Merging changes into %s...done" file))))
;;;
;;; History functions
;;;
(defun vc-mcvs-print-log (file)
"Get change log associated with FILE."
(vc-mcvs-command
nil
(if (and (vc-mcvs-stay-local-p file) (fboundp 'start-process)) 'async 0)
file "log"))
(defun vc-mcvs-diff (file &optional oldvers newvers)
"Get a difference report using Meta-CVS between two versions of FILE."
(let (status (diff-switches-list (vc-diff-switches-list 'MCVS)))
(if (string= (vc-workfile-version file) "0")
;; This file is added but not yet committed; there is no master file.
(if (or oldvers newvers)
(error "No revisions of %s exist" file)
;; We regard this as "changed".
;; Diff it against /dev/null.
;; Note: this is NOT a "mcvs diff".
(apply 'vc-do-command "*vc-diff*"
1 "diff" file
(append diff-switches-list '("/dev/null"))))
(setq status
(apply 'vc-mcvs-command "*vc-diff*"
(if (and (vc-mcvs-stay-local-p file)
(fboundp 'start-process))
'async
1)
file "diff"
(and oldvers (concat "-r" oldvers))
(and newvers (concat "-r" newvers))
diff-switches-list))
(if (vc-mcvs-stay-local-p file)
1 ;; async diff, pessimistic assumption
status))))
(defun vc-mcvs-diff-tree (dir &optional rev1 rev2)
"Diff all files at and below DIR."
(with-current-buffer "*vc-diff*"
(setq default-directory dir)
(if (vc-mcvs-stay-local-p dir)
;; local diff: do it filewise, and only for files that are modified
(vc-file-tree-walk
dir
(lambda (f)
(vc-exec-after
`(let ((coding-system-for-read (vc-coding-system-for-diff ',f)))
;; possible optimization: fetch the state of all files
;; in the tree via vc-mcvs-dir-state-heuristic
(unless (vc-up-to-date-p ',f)
(message "Looking at %s" ',f)
(vc-diff-internal ',f ',rev1 ',rev2))))))
;; cvs diff: use a single call for the entire tree
(let ((coding-system-for-read
(or coding-system-for-read 'undecided)))
(apply 'vc-mcvs-command "*vc-diff*" 1 nil "diff"
(and rev1 (concat "-r" rev1))
(and rev2 (concat "-r" rev2))
(vc-diff-switches-list 'MCVS))))))
(defun vc-mcvs-annotate-command (file buffer &optional version)
"Execute \"mcvs annotate\" on FILE, inserting the contents in BUFFER.
Optional arg VERSION is a version to annotate from."
(vc-mcvs-command
buffer
(if (and (vc-mcvs-stay-local-p file) (fboundp 'start-process)) 'async 0)
file "annotate" (if version (concat "-r" version))))
(defalias 'vc-mcvs-annotate-current-time 'vc-cvs-annotate-current-time)
(defalias 'vc-mcvs-annotate-time 'vc-cvs-annotate-time)
;;;
;;; Snapshot system
;;;
(defun vc-mcvs-create-snapshot (dir name branchp)
"Assign to DIR's current version a given NAME.
If BRANCHP is non-nil, the name is created as a branch (and the current
workspace is immediately moved to that new branch)."
(vc-mcvs-command nil 0 dir "tag" "-c" (if branchp "-b") name)
(when branchp (vc-mcvs-command nil 0 dir "update" "-r" name)))
(defun vc-mcvs-retrieve-snapshot (dir name update)
"Retrieve a snapshot at and below DIR.
NAME is the name of the snapshot; if it is empty, do a `cvs update'.
If UPDATE is non-nil, then update (resynch) any affected buffers."
(with-current-buffer (get-buffer-create "*vc*")
(let ((default-directory dir)
(sticky-tag))
(erase-buffer)
(if (or (not name) (string= name ""))
(vc-mcvs-command t 0 nil "update")
(vc-mcvs-command t 0 nil "update" "-r" name)
(setq sticky-tag name))
(when update
(goto-char (point-min))
(while (not (eobp))
(if (looking-at "\\([CMUP]\\) \\(.*\\)")
(let* ((file (expand-file-name (match-string 2) dir))
(state (match-string 1))
(buffer (find-buffer-visiting file)))
(when buffer
(cond
((or (string= state "U")
(string= state "P"))
(vc-file-setprop file 'vc-state 'up-to-date)
(vc-file-setprop file 'vc-workfile-version nil)
(vc-file-setprop file 'vc-checkout-time
(nth 5 (file-attributes file))))
((or (string= state "M")
(string= state "C"))
(vc-file-setprop file 'vc-state 'edited)
(vc-file-setprop file 'vc-workfile-version nil)
(vc-file-setprop file 'vc-checkout-time 0)))
(vc-file-setprop file 'vc-mcvs-sticky-tag sticky-tag)
(vc-resynch-buffer file t t))))
(forward-line 1))))))
;;;
;;; Miscellaneous
;;;
(defalias 'vc-mcvs-make-version-backups-p 'vc-mcvs-stay-local-p
"Return non-nil if version backups should be made for FILE.")
(defalias 'vc-mcvs-check-headers 'vc-cvs-check-headers)
;;;
;;; Internal functions
;;;
(defun vc-mcvs-command (buffer okstatus file &rest flags)
"A wrapper around `vc-do-command' for use in vc-mcvs.el.
The difference to vc-do-command is that this function always invokes `mcvs',
and that it passes `vc-mcvs-global-switches' to it before FLAGS."
(apply 'vc-do-command buffer okstatus "mcvs" file
(append '("--error-continue")
(if (stringp vc-mcvs-global-switches)
(cons vc-mcvs-global-switches flags)
(append vc-mcvs-global-switches
flags)))))
(defun vc-mcvs-stay-local-p (file) (vc-mcvs-cvs stay-local-p file))
(defun vc-mcvs-dir-state-heuristic (dir)
"Find the Meta-CVS state of all files in DIR, using only local information."
(with-temp-buffer
(vc-cvs-get-entries dir)
(goto-char (point-min))
(while (not (eobp))
;; Meta-MCVS-removed files are not taken under VC control.
(when (looking-at "/\\([^/]*\\)/[^/-]")
(let ((file (expand-file-name (match-string 1) dir)))
(unless (vc-file-getprop file 'vc-state)
(vc-cvs-parse-entry file t))))
(forward-line 1))))
(defalias 'vc-mcvs-valid-symbolic-tag-name-p 'vc-cvs-valid-symbolic-tag-name-p)
(defalias 'vc-mcvs-valid-version-number-p 'vc-cvs-valid-version-number-p)
(provide 'vc-mcvs)
;;; vc-mcvs.el ends here
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