70 lines
2.2 KiB
EmacsLisp
70 lines
2.2 KiB
EmacsLisp
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;;; racket-show.el -*- lexical-binding: t -*-
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;; Copyright (c) 2013-2020 by Greg Hendershott.
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;; Portions Copyright (C) 1985-1986, 1999-2013 Free Software Foundation, Inc.
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;; Author: Greg Hendershott
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;; URL: https://github.com/greghendershott/racket-mode
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;; License:
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;; This is free software; you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version. This is distributed in the hope that it will be
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;; useful, but without any warranty; without even the implied warranty
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;; of merchantability or fitness for a particular purpose. See the GNU
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;; General Public License for more details. See
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;; http://www.gnu.org/licenses/ for details.
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(require 'racket-util)
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(require 'racket-custom)
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(require 'pos-tip)
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(defun racket-show (val &optional pos)
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(dolist (f racket-show-functions)
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(funcall f val pos)))
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(defun racket-show-echo-area (v &optional _pos)
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"Show things in the echo area.
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A value for the variable `racket-show-functions'."
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(if v
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(message "%s" v)
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(message "")))
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(defun racket-show-header-line (v &optional _pos)
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"Show things using a buffer header line.
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A value for the variable `racket-show-functions'.
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When there is nothing to show, keep a blank header-line. That
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way, the buffer below doesn't \"jump up and down\" by a line as
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messages appear and disappear. Only when V is nil do we remove
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the header line."
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(setq-local header-line-format
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(and v (format "%s" (racket--only-first-line v)))))
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(defun racket--only-first-line (str)
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(save-match-data
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(string-match (rx (group (* (not (any ?\n))))) str)
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(match-string 1 str)))
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(defun racket-show-pos-tip (v &optional pos)
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"Show things using `pos-tip-show' if available.
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A value for the variable `racket-show-functions'."
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(when (racket--pos-tip-available-p)
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(if (racket--non-empty-string-p v)
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(pos-tip-show v nil pos)
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(pos-tip-hide))))
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(defun racket--pos-tip-available-p ()
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"Is `pos-tip' available and expected to work on current frame?"
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(and (fboundp 'x-hide-tip)
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(fboundp 'x-show-tip)
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(not (memq window-system (list nil 'pc)))))
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(provide 'racket-show)
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;; racket-show.el ends here
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