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;;; vc-mtn.el --- VC backend for Monotone

;; Copyright (C) 2007  Free Software Foundation, Inc.

;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: 

;; This file 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 3, or (at your option)
;; any later version.

;; This file 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; 

;;; Code:

(eval-when-compile (require 'cl) (require 'vc))

;; Clear up the cache to force vc-call to check again and discover
;; new functions when we reload this file.
(put 'Mtn 'vc-functions nil)

(defvar vc-mtn-command "mtn")
(unless (executable-find vc-mtn-command)
  ;; vc-mtn.el is 100% non-functional without the `mtn' executable.
  (setq vc-handled-backends (delq 'Mtn vc-handled-backends)))

;;;###autoload
(defconst vc-mtn-admin-dir "_MTN")
;;;###autoload
(defconst vc-mtn-admin-format (concat vc-mtn-admin-dir "/format"))

;;;###autoload (defun vc-mtn-registered (file)
;;;###autoload   (if (vc-find-root file vc-mtn-admin-format)
;;;###autoload       (progn
;;;###autoload         (load "vc-mtn")
;;;###autoload         (vc-mtn-registered file))))

(defun vc-mtn-revision-granularity () 'repository)
(defun vc-mtn-checkout-model (file) 'implicit)

(defun vc-mtn-root (file)
  (setq file (if (file-directory-p file)
                 (file-name-as-directory file)
               (file-name-directory file)))
  (or (vc-file-getprop file 'vc-mtn-root)
      (vc-file-setprop file 'vc-mtn-root
                       (vc-find-root file vc-mtn-admin-format))))


(defun vc-mtn-registered (file)
  (let ((root (vc-mtn-root file)))
    (when root
      (vc-mtn-state file))))

(defun vc-mtn-command (buffer okstatus files &rest flags)
  "A wrapper around `vc-do-command' for use in vc-mtn.el."
  (apply 'vc-do-command buffer okstatus vc-mtn-command files flags))

(defun vc-mtn-state (file)
  ;; If `mtn' fails or returns status>0, or if the search files, just
  ;; return nil.
  (ignore-errors
    (with-temp-buffer
      (vc-mtn-command t 0 file "status")
      (goto-char (point-min))
      (re-search-forward "^  \\(?:patched \\(.*\\)\\|no changes$\\)")
      (if (match-end 1)
          'edited
        'up-to-date))))

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(defun vc-mtn-working-revision (file)
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  ;; If `mtn' fails or returns status>0, or if the search fails, just
  ;; return nil.
  (ignore-errors
    (with-temp-buffer
      (vc-mtn-command t 0 file "status")
      (goto-char (point-min))
      (re-search-forward "Current branch: \\(.*\\)\nChanges against parent \\(.*\\)")
      (match-string 2))))

(defun vc-mtn-workfile-branch (file)
  ;; If `mtn' fails or returns status>0, or if the search files, just
  ;; return nil.
  (ignore-errors
    (with-temp-buffer
      (vc-mtn-command t 0 file "status")
      (goto-char (point-min))
      (re-search-forward "Current branch: \\(.*\\)\nChanges against parent \\(.*\\)")
      (match-string 1))))

(defun vc-mtn-workfile-unchanged-p (file)
  (not (eq (vc-mtn-state file) 'edited)))

;; Mode-line rewrite code copied from vc-arch.el.

(defcustom vc-mtn-mode-line-rewrite
  '(("\\`[^:/#]*[:/#]" . ""))           ;Drop the host part.
  "Rewrite rules to shorten Mtn's revision names on the mode-line."
  :type '(repeat (cons regexp string))
  :group 'vc)

(defun vc-mtn-mode-line-string (file)
  "Return string for placement in modeline by `vc-mode-line' for FILE."
  (let ((branch (vc-mtn-workfile-branch file)))
    (dolist (rule vc-mtn-mode-line-rewrite)
      (if (string-match (car rule) branch)
	  (setq branch (replace-match (cdr rule) t nil branch))))
    (format "Mtn%c%s"
	    (case (vc-state file)
	      ((up-to-date needs-patch) ?-)
	      (added ?@)
	      (t ?:))
	    branch)))

(defun vc-mtn-register (files &optional rest)
  (vc-mtn-command nil 0 files "add"))

(defun vc-mtn-responsible-p (file) (vc-mtn-root file))
(defun vc-mtn-could-register (file) (vc-mtn-root file))

(defun vc-mtn-checkin (files rev comment)
  (vc-mtn-command nil 0 files "commit" "-m" comment))

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(defun vc-mtn-find-revision (file rev buffer)
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  (vc-mtn-command buffer 0 file "cat" "-r" rev))

;; (defun vc-mtn-checkout (file &optional editable rev)
;;   )

(defun vc-mtn-revert (file &optional contents-done)
  (unless contents-done
    (vc-mtn-command nil 0 file "revert")))

;; (defun vc-mtn-roolback (files)
;;   )

(defun vc-mtn-print-log (files &optional buffer)
  (vc-mtn-command buffer 0 files "log"))

(define-derived-mode vc-mtn-log-view-mode log-view-mode "Mtn-Log-View"
  ;; TODO: Not sure what to do about file markers for now.
  (set (make-local-variable 'log-view-file-re) "\\'\\`")
  ;; TODO: Use a more precise regexp than "[ |/]+" to avoid false positives
  ;; in the ChangeLog text.
  (set (make-local-variable 'log-view-message-re)
       "^[ |/]+Revision: \\([0-9a-f]+\\)")
  (require 'add-log)                    ;For change-log faces.
  (set (make-local-variable 'log-view-font-lock-keywords)
       (append log-view-font-lock-keywords
               '(("^[ |]+Author: \\(.*\\)" (1 'change-log-email))
                 ("^[ |]+Date: \\(.*\\)" (1 'change-log-date-face))))))

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;; (defun vc-mtn-show-log-entry (revision)
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;;   )

(defun vc-mtn-wash-log (file))

(defalias 'vc-mtn-diff-tree 'vc-mtn-diff)
(defun vc-mtn-diff (files &optional rev1 rev2 buffer)
  (apply 'vc-mtn-command (or buffer "*vc-diff*") 1 files "diff"
         (append (if rev1 (list "-r" rev1)) (if rev2 (list "-r" rev2)))))

(defun vc-mtn-annotate-command (file buf &optional rev)
  (apply 'vc-mtn-command buf 0 file "annotate"
         (if rev (list "-r" rev))))

(defconst vc-mtn-annotate-full-re
  "^ *\\([0-9a-f]+\\)\\.* by [^ ]+ \\([0-9]+\\)-\\([0-9]+\\)-\\([0-9]+\\): ")
(defconst vc-mtn-annotate-any-re
  (concat "^\\(?: +: \\|" vc-mtn-annotate-full-re "\\)"))

(defun vc-mtn-annotate-time ()
  (when (looking-at vc-mtn-annotate-any-re)
    (goto-char (match-end 0))
    (let ((year (match-string 2)))
      (if (not year)
          ;; Look for the date on a previous line.
          (save-excursion
            (get-text-property (1- (previous-single-property-change
                                    (point) 'vc-mtn-time nil (point-min)))
                               'vc-mtn-time))
        (let ((time (vc-annotate-convert-time
                     (encode-time 0 0 0
                                  (string-to-number (match-string 4))
                                  (string-to-number (match-string 3))
                                  (string-to-number year)
                                  t))))
          (let ((inhibit-read-only t)
                (inhibit-modification-hooks t))
            (put-text-property (match-beginning 0) (match-end 0)
                               'vc-mtn-time time))
          time)))))

(defun vc-mtn-annotate-extract-revision-at-line ()
  (save-excursion
    (when (or (looking-at vc-mtn-annotate-full-re)
              (re-search-backward vc-mtn-annotate-full-re nil t))
      (match-string 1))))

;;; Revision completion.

(defun vc-mtn-list-tags ()
  (with-temp-buffer
    (vc-mtn-command t 0 nil "list" "tags")
    (goto-char (point-min))
    (let ((tags ()))
      (while (re-search-forward "^[^ ]+" nil t)
        (push (match-string 0) tags))
      tags)))

(defun vc-mtn-list-branches ()
  (with-temp-buffer
    (vc-mtn-command t 0 nil "list" "branches")
    (goto-char (point-min))
    (let ((branches ()))
      (while (re-search-forward "^.+" nil t)
        (push (match-string 0) branches))
      branches)))

(defun vc-mtn-list-revision-ids (prefix)
  (with-temp-buffer
    (vc-mtn-command t 0 nil "complete" "revision" prefix)
    (goto-char (point-min))
    (let ((ids ()))
      (while (re-search-forward "^.+" nil t)
        (push (match-string 0) ids))
      ids)))

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(defun vc-mtn-revision-completion-table (files)
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  ;; TODO: Implement completion for for selectors
  ;; TODO: Implement completion for composite selectors.
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  (lexical-let ((files files))
    ;; What about using `files'?!?  --Stef
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    (lambda (string pred action)
      (cond
       ;; "Tag" selectors.
       ((string-match "\\`t:" string)
        (complete-with-action action
                              (mapcar (lambda (tag) (concat "t:" tag))
                                      (vc-mtn-list-tags))
                              string pred))
       ;; "Branch" selectors.
       ((string-match "\\`b:" string)
        (complete-with-action action
                              (mapcar (lambda (tag) (concat "b:" tag))
                                      (vc-mtn-list-branches))
                              string pred))
       ;; "Head" selectors.  Not sure how they differ from "branch" selectors.
       ((string-match "\\`h:" string)
        (complete-with-action action
                              (mapcar (lambda (tag) (concat "h:" tag))
                                      (vc-mtn-list-branches))
                              string pred))
       ;; "ID" selectors.
       ((string-match "\\`i:" string)
        (complete-with-action action
                              (mapcar (lambda (tag) (concat "i:" tag))
                                      (vc-mtn-list-revision-ids
                                       (substring string (match-end 0))))
                              string pred))
       (t
        (complete-with-action action
                              '("t:" "b:" "h:" "i:"
                                ;; Completion not implemented for these.
                                "a:" "c:" "d:" "e:" "l:")
                              string pred))))))
        
        

(provide 'vc-mtn)

;; arch-tag: 2b89ffbc-cbb8-405a-9080-2eafd4becb70
;;; vc-mtn.el ends here