111 lines
3.5 KiB
EmacsLisp
111 lines
3.5 KiB
EmacsLisp
;;; expander.el --- Text expander interface
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;; Copyright (C) 2009 Tomohiro Matsuyama
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;; Author: Tomohiro Matsuyama <m2ym.pub@gmail.com>
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;; Keywords: lisp
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;; This program 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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;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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(eval-when-compile
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(require 'cl))
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(defface expander-face
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'((t (:background "darkblue" :foreground "white")))
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"Default face for expander.")
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(defstruct expander
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face overlay marker)
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(defun* expander-create (&optional (face 'expander-face))
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(make-expander :face face
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:marker (make-marker)))
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(defun expander-delete (expander)
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(when (expander-live-p expander)
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(expander-hide expander)
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(delete-overlay (expander-overlay expander))
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(setf (expander-overlay expander))))
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(defun expander-live-p (expander)
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(and expander (expander-overlay expander) t))
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(defun expander-show (expander point string)
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(save-excursion
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(let ((overlay (expander-overlay expander))
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(width 0)
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(string-width (string-width string))
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(original-string string))
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;; Calculate string space to show completion
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(goto-char point)
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(while (and (not (eolp))
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(< width string-width))
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(incf width (char-width (char-after)))
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(forward-char))
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;; Show completion
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(goto-char point)
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(cond
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((= width 0)
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(set-marker (expander-marker expander) point)
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(let ((buffer-undo-list t))
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(insert " "))
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(setq width 1))
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((<= width string-width)
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;; No space to show
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;; Do nothing
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)
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((> width string-width)
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;; Need to fill space
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(setq string (concat string (make-string (- width string-width) ? )))))
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(setq string (propertize string 'face (expander-face expander)))
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(if overlay
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(progn
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(move-overlay overlay point (+ point width))
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(overlay-put overlay 'invisible nil))
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(setq overlay (make-overlay point (+ point width)))
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(setf (expander-overlay expander) overlay)
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(overlay-put overlay 'priority 9999))
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(overlay-put overlay 'display (substring string 0 1))
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;; TODO no width but char
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(overlay-put overlay 'after-string (substring string 1))
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(overlay-put overlay 'string original-string))))
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(defun expander-hide (expander)
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(let ((overlay (expander-overlay expander))
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(marker (expander-marker expander))
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(buffer-undo-list t))
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(when overlay
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(when (marker-position marker)
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(save-excursion
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(goto-char marker)
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(delete-char 1)
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(set-marker marker nil)))
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(move-overlay overlay (point-min) (point-min))
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(overlay-put overlay 'invisible t)
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(overlay-put overlay 'display nil)
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(overlay-put overlay 'after-string nil))))
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(defun expander-string (expander)
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(overlay-get (expander-overlay expander) 'string))
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(provide 'expander)
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;;; expander.el ends here
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