Emacs: add mq.el, early support for Mercurial Queues.

contrib/mq.el

@@ -0,0 +1,206
+;;; mq.el --- Emacs support for Mercurial Queues
+
+;; Copyright (C) 2006 Bryan O'Sullivan
+
+;; Author: Bryan O'Sullivan <[e-mail]>
+
+;; mq.el is free software; you can redistribute it and/or modify it
+;; under the terms of version 2 of the GNU General Public License as
+;; published by the Free Software Foundation.
+
+;; mq.el 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 mq.el, GNU Emacs, or XEmacs; see the file COPYING (`C-h
+;; C-l').  If not, write to the Free Software Foundation, Inc., 59
+;; Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+(require 'mercurial)
+
+
+(defcustom mq-mode-hook nil
+  "Hook run when a buffer enters mq-mode."
+  :type 'sexp
+  :group 'mercurial)
+
+(defcustom mq-global-prefix "\C-cq"
+  "The global prefix for Mercurial Queues keymap bindings."
+  :type 'sexp
+  :group 'mercurial)
+
+
+;;; Internal variables.
+
+(defvar mq-patch-history nil)
+
+
+;;; Global keymap.
+
+(defvar mq-global-map (make-sparse-keymap))
+(fset 'mq-global-map mq-global-map)
+(global-set-key mq-global-prefix 'mq-global-map)
+(define-key mq-global-map "." 'mq-push)
+(define-key mq-global-map ">" 'mq-push-all)
+(define-key mq-global-map "," 'mq-pop)
+(define-key mq-global-map "<" 'mq-pop-all)
+(define-key mq-global-map "r" 'mq-refresh)
+(define-key mq-global-map "e" 'mq-refresh-edit)
+(define-key mq-global-map "n" 'mq-next)
+(define-key mq-global-map "p" 'mq-previous)
+(define-key mq-global-map "t" 'mq-top)
+
+
+;;; Helper functions.
+
+(defun mq-read-patch-name (&optional source prompt)
+  "Read a patch name to use with a command.
+May return nil, meaning \"use the default\"."
+  (let ((patches (split-string
+		  (hg-chomp (hg-run0 (or source "qseries"))) "\n")))
+    (when current-prefix-arg
+      (completing-read (format "Patch%s: " (or prompt ""))
+		       (map 'list 'cons patches patches)
+		       nil
+		       nil
+		       nil
+		       'mq-patch-history))))
+
+(defun mq-refresh-buffers (root)
+  (save-excursion
+    (dolist (buf (hg-buffers-visiting-repo root))
+      (when (not (verify-visited-file-modtime buf))
+	(set-buffer buf)
+	(let ((ctx (hg-buffer-context)))
+	  (message "Refreshing %s..." (buffer-name))
+	  (revert-buffer t t t)
+	  (hg-restore-context ctx)
+	  (message "Refreshing %s...done" (buffer-name))))))
+  (hg-update-mode-lines root))
+
+(defun mq-last-line ()
+  (goto-char (point-max))
+  (beginning-of-line)
+  (when (looking-at "^$")
+    (forward-line -1))
+  (let ((bol (point)))
+    (end-of-line)
+    (let ((line (buffer-substring bol (point))))
+      (when (> (length line) 0)
+	line))))
+  
+(defun mq-push (&optional patch)
+  "Push patches until PATCH is reached.
+If PATCH is nil, push at most one patch."
+  (interactive (list (mq-read-patch-name "qunapplied" " to push")))
+  (let ((root (hg-root))
+	(prev-buf (current-buffer))
+	last-line ok)
+    (unless root
+      (error "Cannot push outside a repository!"))
+    (hg-sync-buffers root)
+    (let ((buf-name (format "MQ: Push %s" (or patch "next patch"))))
+      (kill-buffer (get-buffer-create buf-name))
+      (split-window-vertically)
+      (other-window 1)
+      (switch-to-buffer (get-buffer-create buf-name))
+      (cd root)
+      (message "Pushing...")
+      (setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpush"
+			   (if patch (list patch))))
+	    last-line (mq-last-line))
+      (let ((lines (count-lines (point-min) (point-max))))
+	(if (and (equal lines 2) (string-match "Now at:" last-line))
+	    (progn
+	      (kill-buffer (current-buffer))
+	      (delete-window))
+	  (hg-view-mode prev-buf))))
+    (mq-refresh-buffers root)
+    (sit-for 0)
+    (when last-line
+      (if ok
+	  (message "Pushing... %s" last-line)
+	(error "Pushing... %s" last-line)))))
+  
+(defun mq-push-all ()
+  "Push patches until all are applied."
+  (interactive)
+  (mq-push "-a"))
+
+(defun mq-pop (&optional patch)
+  "Pop patches until PATCH is reached.
+If PATCH is nil, pop at most one patch."
+  (interactive (list (mq-read-patch-name "qapplied" " to pop to")))
+  (let ((root (hg-root))
+	last-line ok)
+    (unless root
+      (error "Cannot pop outside a repository!"))
+    (hg-sync-buffers root)
+    (set-buffer (generate-new-buffer "qpop"))
+    (cd root)
+    (message "Popping...")
+    (setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpop"
+			 (if patch (list patch))))
+	  last-line (mq-last-line))
+    (kill-buffer (current-buffer))
+    (mq-refresh-buffers root)
+    (sit-for 0)
+    (when last-line
+      (if ok
+	  (message "Popping... %s" last-line)
+	(error "Popping... %s" last-line)))))
+  
+(defun mq-pop-all ()
+  "Push patches until none are applied."
+  (interactive)
+  (mq-pop "-a"))
+
+(defun mq-refresh ()
+  "Refresh the topmost applied patch."
+  (interactive)
+  (let ((root (hg-root)))
+    (unless root
+      (error "Cannot refresh outside a repository!"))
+    (hg-sync-buffers root)
+    (message "Refreshing patch...")
+    (let ((ret (hg-run "qrefresh")))
+      (if (equal (car ret) 0)
+	  (message "Refreshing patch... done.")
+	(error "Refreshing patch... %s" (hg-chomp (cdr ret)))))))
+
+(defun mq-patch-info (msg cmd)
+  (let ((ret (hg-run cmd)))
+    (if (equal (car ret) 0)
+	(message "%s %s" msg (hg-chomp (cdr ret)))
+      (error "%s" (cdr ret)))))
+
+(defun mq-top ()
+  "Print the name of the topmost applied patch."
+  (interactive)
+  (mq-patch-info "Top patch is " "qtop"))
+
+(defun mq-next ()
+  "Print the name of the next patch to be pushed."
+  (interactive)
+  (mq-patch-info "Next patch is " "qnext"))
+
+(defun mq-previous ()
+  "Print the name of the first patch below the topmost applied patch.
+This would become the active patch if popped to."
+  (interactive)
+  (mq-patch-info "Previous patch is " "qprev"))
+
+(defun mq-refresh-edit ()
+  "Refresh the topmost applied patch, editing the patch description."
+  (interactive)
+  (error "Not yet implemented"))
+
+
+(provide 'mq)
+
+
+;;; Local Variables:
+;;; prompt-to-byte-compile: nil
+;;; end: