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80 lines
3.0 KiB
EmacsLisp
80 lines
3.0 KiB
EmacsLisp
;;; mb-depth.el --- Indicate minibuffer-depth in prompt -*- lexical-binding: t -*-
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;;
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;; Copyright (C) 2006-2018 Free Software Foundation, Inc.
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;;
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;; Author: Miles Bader <miles@gnu.org>
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;; Keywords: convenience
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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 <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;; Defines the minor mode `minibuffer-depth-indicate-mode'.
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;;
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;; When active, any recursive use of the minibuffer will show
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;; the recursion depth in the minibuffer prompt. This is only
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;; useful if `enable-recursive-minibuffers' is non-nil.
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;;; Code:
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(defvar minibuffer-depth-indicator-function nil
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"If non-nil, function to set up the minibuffer depth indicator.
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It is called with one argument, the minibuffer depth,
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and must return a string.")
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;; An overlay covering the prompt. This is a buffer-local variable in
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;; each affected minibuffer.
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;;
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(defvar minibuffer-depth-overlay)
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(make-variable-buffer-local 'minibuffer-depth-overlay)
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;; This function goes on minibuffer-setup-hook
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(defun minibuffer-depth-setup ()
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"Set up a minibuffer for `minibuffer-depth-indicate-mode'.
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The prompt should already have been inserted."
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(let ((depth (minibuffer-depth)))
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(when (> depth 1)
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(let ((pos (point-min)))
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(setq minibuffer-depth-overlay (make-overlay pos (1+ pos))))
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(overlay-put minibuffer-depth-overlay 'before-string
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(if minibuffer-depth-indicator-function
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(funcall minibuffer-depth-indicator-function depth)
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(propertize (format "[%d]" depth) 'face 'highlight)))
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(overlay-put minibuffer-depth-overlay 'evaporate t))))
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;;;###autoload
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(define-minor-mode minibuffer-depth-indicate-mode
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"Toggle Minibuffer Depth Indication mode.
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With a prefix argument ARG, enable Minibuffer Depth Indication
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mode if ARG is positive, and disable it otherwise. If called
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from Lisp, enable the mode if ARG is omitted or nil.
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Minibuffer Depth Indication mode is a global minor mode. When
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enabled, any recursive use of the minibuffer will show the
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recursion depth in the minibuffer prompt. This is only useful if
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`enable-recursive-minibuffers' is non-nil."
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:global t
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:group 'minibuffer
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(if minibuffer-depth-indicate-mode
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;; Enable the mode
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(add-hook 'minibuffer-setup-hook 'minibuffer-depth-setup)
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;; Disable the mode
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(remove-hook 'minibuffer-setup-hook 'minibuffer-depth-setup)))
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(provide 'mb-depth)
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;;; mb-depth.el ends here
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