Merge commit 'e342c330807fdd09adba974611122d1c95bdf07d' from hydra

[gnu-emacs-elpa] / packages / hydra / lv.el

diff --git a/packages/hydra/lv.el b/packages/hydra/lv.el
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+;;; lv.el --- Other echo area
+
+;; Copyright (C) 2015  Free Software Foundation, Inc.
+
+;; Author: Oleh Krehel
+
+;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; This package provides `lv-message' intended to be used in place of
+;; `message' when semi-permanent hints are needed, in order to not
+;; interfere with Echo Area.
+;;
+;;    "Я тихо-тихо пiдглядаю,
+;;     І тiшуся собi, як бачу то,
+;;     Шо страшить i не пiдпускає,
+;;     А iншi п’ють тебе, як воду пiсок."
+;;     --  Андрій Кузьменко, L.V.
+
+;;; Code:
+
+(defvar lv-wnd nil
+  "Holds the current LV window.")
+
+(defun lv-window ()
+  "Ensure that LV window is live and return it."
+  (if (window-live-p lv-wnd)
+      lv-wnd
+    (let ((ori (selected-window))
+          (golden-ratio-mode nil)
+          buf)
+      (prog1 (setq lv-wnd
+                   (select-window
+                    (split-window
+                     (frame-root-window) -1 'below)))
+        (if (setq buf (get-buffer "*LV*"))
+            (switch-to-buffer buf)
+          (switch-to-buffer "*LV*")
+          (setq truncate-lines nil)
+          (setq mode-line-format nil)
+          (setq cursor-type nil)
+          (set-window-dedicated-p lv-wnd t)
+          (set-window-parameter lv-wnd 'no-other-window t))
+        (select-window ori)))))
+
+(defun lv-message (format-string &rest args)
+  "Set LV window contents to (`format' FORMAT-STRING ARGS)."
+  (let ((ori (selected-window))
+        (str (apply #'format format-string args))
+        deactivate-mark)
+    (select-window (lv-window))
+    (unless (string= (buffer-string) str)
+      (delete-region (point-min) (point-max))
+      (insert str)
+      (fit-window-to-buffer nil nil 1))
+    (goto-char (point-min))
+    (select-window ori)))
+
+(provide 'lv)
+
+;;; lv.el ends here