77 lines
2.5 KiB
EmacsLisp
77 lines
2.5 KiB
EmacsLisp
;;; indent-aux.el --- Autoloaded indentation commands for Emacs -*- lexical-binding:t -*-
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;; Copyright (C) 2023-2024 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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;; Package: emacs
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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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;; Autoloaded commands for making and changing indentation in text and
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;; killed text
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;;; Code:
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;; Indent Filter mode. When enabled, this minor mode filters all
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;; killed text to remove leading indentation.
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(defun kill-ring-deindent-buffer-substring-function (beg end delete)
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"Save the text within BEG and END to kill-ring, decreasing indentation.
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Delete the saved text if DELETE is non-nil.
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In the saved copy of the text, remove some of the indentation, such
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that the buffer position at BEG will be at column zero when the text
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is yanked."
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(let ((a beg)
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(b end))
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(setq beg (min a b)
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end (max a b)))
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(let ((indentation (save-excursion (goto-char beg)
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(current-column)))
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(text (if delete
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(delete-and-extract-region beg end)
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(buffer-substring beg end))))
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(with-temp-buffer
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(insert text)
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(indent-rigidly (point-min) (point-max)
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(- indentation))
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(buffer-string))))
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;;;###autoload
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(define-minor-mode kill-ring-deindent-mode
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"Toggle removal of indentation from text saved to the kill ring.
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When this minor mode is enabled, text saved into the kill ring is
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indented towards the left by the column number at the start of
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that text."
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:global 't
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:group 'killing
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(if kill-ring-deindent-mode
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(add-function :override filter-buffer-substring-function
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#'kill-ring-deindent-buffer-substring-function
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'(:depth 100))
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(remove-function filter-buffer-substring-function
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#'kill-ring-deindent-buffer-substring-function)))
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(provide 'indent-aux)
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;;; indent-aux.el ends here.
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