149 lines
4.9 KiB
EmacsLisp
149 lines
4.9 KiB
EmacsLisp
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;;; lv.el --- Other echo area
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;; Copyright (C) 2015 Free Software Foundation, Inc.
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;; Author: Oleh Krehel
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;; This package provides `lv-message' intended to be used in place of
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;; `message' when semi-permanent hints are needed, in order to not
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;; interfere with Echo Area.
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;;
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;; "Я тихо-тихо пiдглядаю,
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;; І тiшуся собi, як бачу то,
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;; Шо страшить i не пiдпускає,
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;; А iншi п’ють тебе, як воду пiсок."
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;; -- Андрій Кузьменко, L.V.
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;;; Code:
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(require 'cl-lib)
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(defgroup lv nil
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"The other echo area."
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:group 'minibuffer
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:group 'hydra)
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(defcustom lv-use-separator nil
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"Whether to draw a line between the LV window and the Echo Area."
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:group 'lv
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:type 'boolean)
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(defcustom lv-use-padding nil
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"Whether to use horizontal padding in the LV window."
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:group 'lv
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:type 'boolean)
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(defface lv-separator
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'((((class color) (background light)) :background "grey80")
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(((class color) (background dark)) :background "grey30"))
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"Face used to draw line between the lv window and the echo area.
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This is only used if option `lv-use-separator' is non-nil.
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Only the background color is significant."
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:group 'lv)
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(defvar lv-wnd nil
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"Holds the current LV window.")
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(defvar display-line-numbers)
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(defvar display-fill-column-indicator)
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(defvar tab-line-format)
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(defvar lv-window-hook nil
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"Hook to run by `lv-window' when a new window is created.")
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(defun lv-window ()
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"Ensure that LV window is live and return it."
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(if (window-live-p lv-wnd)
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lv-wnd
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(let ((ori (selected-window))
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buf)
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(prog1 (setq lv-wnd
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(select-window
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(let ((ignore-window-parameters t))
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(split-window
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(frame-root-window) -1 'below))
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'norecord))
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(if (setq buf (get-buffer " *LV*"))
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(switch-to-buffer buf 'norecord)
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(switch-to-buffer " *LV*" 'norecord)
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(fundamental-mode)
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(set-window-hscroll lv-wnd 0)
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(setq window-size-fixed t)
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(setq mode-line-format nil)
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(setq header-line-format nil)
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(setq tab-line-format nil)
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(setq cursor-type nil)
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(setq display-line-numbers nil)
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(setq display-fill-column-indicator nil)
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(set-window-dedicated-p lv-wnd t)
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(set-window-parameter lv-wnd 'no-other-window t)
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(run-hooks 'lv-window-hook))
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(select-window ori 'norecord)))))
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(defvar golden-ratio-mode)
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(defvar lv-force-update nil
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"When non-nil, `lv-message' will refresh even for the same string.")
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(defun lv--pad-to-center (str width)
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"Pad STR with spaces on the left to be centered to WIDTH."
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(let* ((strs (split-string str "\n"))
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(padding (make-string
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(/ (- width (length (car strs))) 2)
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?\ )))
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(mapconcat (lambda (s) (concat padding s)) strs "\n")))
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(defun lv-message (format-string &rest args)
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"Set LV window contents to (`format' FORMAT-STRING ARGS)."
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(let* ((str (apply #'format format-string args))
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(n-lines (cl-count ?\n str))
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deactivate-mark
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golden-ratio-mode)
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(with-selected-window (lv-window)
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(when lv-use-padding
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(setq str (lv--pad-to-center str (window-width))))
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(unless (and (string= (buffer-string) str)
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(null lv-force-update))
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(delete-region (point-min) (point-max))
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(insert str)
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(when (and (window-system) lv-use-separator)
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(unless (looking-back "\n" nil)
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(insert "\n"))
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(insert
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(propertize "__" 'face 'lv-separator 'display '(space :height (1)))
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(propertize "\n" 'face 'lv-separator 'line-height t)))
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(set (make-local-variable 'window-min-height) n-lines)
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(setq truncate-lines (> n-lines 1))
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(let ((window-resize-pixelwise t)
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(window-size-fixed nil))
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(fit-window-to-buffer nil nil 1)))
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(goto-char (point-min)))))
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(defun lv-delete-window ()
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"Delete LV window and kill its buffer."
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(when (window-live-p lv-wnd)
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(let ((buf (window-buffer lv-wnd)))
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(delete-window lv-wnd)
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(kill-buffer buf))))
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(provide 'lv)
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;;; lv.el ends here
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