mq.el: don't fill half the screen with a single line of output.

contrib/mq.el

@@ -1,374 +1,375 b''
 ;;; 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)
 
 (defcustom mq-edit-mode-hook nil
   "Hook run after a buffer is populated to edit a patch description."
   :type 'sexp
   :group 'mercurial)
 
 (defcustom mq-edit-finish-hook nil
   "Hook run before a patch description is finished up with."
   :type 'sexp
   :group 'mercurial)
 
 
 ;;; Internal variables.
 
 (defvar mq-mode nil
   "Is this file managed by MQ?")
 (make-variable-buffer-local 'mq-mode)
 (put 'mq-mode 'permanent-local t)
 
 (defvar mq-patch-history nil)
 
 (defvar mq-top-patch '(nil))
 
 (defvar mq-prev-buffer nil)
 (make-variable-buffer-local 'mq-prev-buffer)
 (put 'mq-prev-buffer 'permanent-local t)
 
 
 ;;; 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 "=" 'mq-diff)
 (define-key mq-global-map "r" 'mq-refresh)
 (define-key mq-global-map "e" 'mq-refresh-edit)
 (define-key mq-global-map "i" 'mq-new)
 (define-key mq-global-map "n" 'mq-next)
 (define-key mq-global-map "p" 'mq-previous)
 (define-key mq-global-map "s" 'mq-edit-series)
 (define-key mq-global-map "t" 'mq-top)
 
 (add-minor-mode 'mq-mode 'mq-mode)
 
 
 ;;; Refresh edit mode keymap.
 
 (defvar mq-edit-mode-map (make-sparse-keymap))
 (define-key mq-edit-mode-map "\C-c\C-c" 'mq-edit-finish)
 (define-key mq-edit-mode-map "\C-c\C-k" 'mq-edit-kill)
 
 
 ;;; Helper functions.
 
 (defun mq-read-patch-name (&optional source prompt force)
   "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 force
       (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)
   (mq-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"
 					 current-prefix-arg)))
   (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))
+	(if (or (<= lines 1)
+		(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"
 					 current-prefix-arg)))
   (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-internal (root &rest args)
   (hg-sync-buffers root)
   (let ((patch (mq-patch-info "qtop")))
     (message "Refreshing %s..." patch)
     (let ((ret (apply 'hg-run "qrefresh" args)))
       (if (equal (car ret) 0)
 	  (message "Refreshing %s... done." patch)
 	(error "Refreshing %s... %s" patch (hg-chomp (cdr ret)))))))
 
 (defun mq-refresh (&optional git)
   "Refresh the topmost applied patch.
 With a prefix argument, generate a git-compatible patch."
   (interactive "P")
   (let ((root (hg-root)))
     (unless root
       (error "Cannot refresh outside of a repository!"))
     (apply 'mq-refresh-internal root (if git '("--git")))))
 
 (defun mq-patch-info (cmd &optional msg)
   (let* ((ret (hg-run cmd))
 	 (info (hg-chomp (cdr ret))))
     (if (equal (car ret) 0)
 	(if msg
 	    (message "%s patch: %s" msg info)
 	  info)
       (error "%s" info))))
 
 (defun mq-top ()
   "Print the name of the topmost applied patch."
   (interactive)
   (mq-patch-info "qtop" "Top"))
 
 (defun mq-next ()
   "Print the name of the next patch to be pushed."
   (interactive)
   (mq-patch-info "qnext" "Next"))
 
 (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 "qprev" "Previous"))
 
 (defun mq-edit-finish ()
   "Finish editing the description of this patch, and refresh the patch."
   (interactive)
   (unless (equal (mq-patch-info "qtop") mq-top)
     (error "Topmost patch has changed!"))
   (hg-sync-buffers hg-root)
   (run-hooks 'mq-edit-finish-hook)
   (mq-refresh-internal hg-root "-m" (buffer-substring (point-min) (point-max)))
   (let ((buf mq-prev-buffer))
     (kill-buffer nil)
     (switch-to-buffer buf)))
   
 (defun mq-edit-kill ()
   "Kill the edit currently being prepared."
   (interactive)
   (when (or (not (buffer-modified-p)) (y-or-n-p "Really kill this edit? "))
     (let ((buf mq-prev-buffer))
       (kill-buffer nil)
       (switch-to-buffer buf))))
 
 (defun mq-get-top (root)
   (let ((entry (assoc root mq-top-patch)))
     (if entry
         (cdr entry))))
 
 (defun mq-set-top (root patch)
   (let ((entry (assoc root mq-top-patch)))
     (if entry
         (if patch
             (setcdr entry patch)
           (setq mq-top-patch (delq entry mq-top-patch)))
       (setq mq-top-patch (cons (cons root patch) mq-top-patch)))))
 
 (defun mq-update-mode-lines (root)
   (let ((cwd default-directory))
     (cd root)
     (condition-case nil
         (mq-set-top root (mq-patch-info "qtop"))
       (error (mq-set-top root nil)))
     (cd cwd))
   (let ((patch (mq-get-top root)))
     (save-excursion
       (dolist (buf (hg-buffers-visiting-repo root))
         (set-buffer buf)
         (if mq-mode
             (setq mq-mode (or (and patch (concat " MQ:" patch)) " MQ")))))))
 	
 (defun mq-mode (&optional arg)
   "Minor mode for Mercurial repositories with an MQ patch queue"
   (interactive "i")
   (cond ((hg-root)
          (setq mq-mode (if (null arg) (not mq-mode)
                          arg))
          (mq-update-mode-lines (hg-root))))
   (run-hooks 'mq-mode-hook))
 
 (defun mq-edit-mode ()
   "Mode for editing the description of a patch.
 
 Key bindings
 ------------
 \\[mq-edit-finish]	use this description
 \\[mq-edit-kill]	abandon this description"
   (interactive)
   (use-local-map mq-edit-mode-map)
   (set-syntax-table text-mode-syntax-table)
   (setq local-abbrev-table text-mode-abbrev-table
 	major-mode 'mq-edit-mode
 	mode-name "MQ-Edit")
   (set-buffer-modified-p nil)
   (setq buffer-undo-list nil)
   (run-hooks 'text-mode-hook 'mq-edit-mode-hook))
   
 (defun mq-refresh-edit ()
   "Refresh the topmost applied patch, editing the patch description."
   (interactive)
   (while mq-prev-buffer
     (set-buffer mq-prev-buffer))
   (let ((root (hg-root))
 	(prev-buffer (current-buffer))
 	(patch (mq-patch-info "qtop")))
     (hg-sync-buffers root)
     (let ((buf-name (format "*MQ: Edit description of %s*" patch)))
       (switch-to-buffer (get-buffer-create buf-name))
       (when (= (point-min) (point-max))
 	(set (make-local-variable 'hg-root) root)
 	(set (make-local-variable 'mq-top) patch)
 	(setq mq-prev-buffer prev-buffer)
 	(insert (hg-run0 "qheader"))
 	(goto-char (point-min)))
       (mq-edit-mode)
       (cd root)))
   (message "Type `C-c C-c' to finish editing and refresh the patch."))
 
 (defun mq-new (name)
   "Create a new empty patch named NAME.
 The patch is applied on top of the current topmost patch.
 With a prefix argument, forcibly create the patch even if the working
 directory is modified."
   (interactive (list (mq-read-patch-name "qseries" " to create" t)))
   (message "Creating patch...")
   (let ((ret (if current-prefix-arg
 		 (hg-run "qnew" "-f" name)
 	       (hg-run "qnew" name))))
     (if (equal (car ret) 0)
 	(progn
 	  (hg-update-mode-lines (buffer-file-name))
 	  (message "Creating patch... done."))
       (error "Creating patch... %s" (hg-chomp (cdr ret))))))
 
 (defun mq-edit-series ()
   "Edit the MQ series file directly."
   (interactive)
   (let ((root (hg-root)))
     (unless root
       (error "Not in an MQ repository!"))
     (find-file (concat root ".hg/patches/series"))))
 
 (defun mq-diff (&optional git)
   "Display a diff of the topmost applied patch.
 With a prefix argument, display a git-compatible diff."
   (interactive "P")
   (hg-view-output ((format "MQ: Diff of %s" (mq-patch-info "qtop")))
     (if git
 	(call-process (hg-binary) nil t nil "qdiff" "--git")
     (call-process (hg-binary) nil t nil "qdiff"))
     (diff-mode)
     (font-lock-fontify-buffer)))
 
 
 (provide 'mq)
 
 
 ;;; Local Variables:
 ;;; prompt-to-byte-compile: nil
 ;;; end: