mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-15 09:47:20 +00:00
65990f47cc
* lisp/elide-head.el: Use lexical-binding. (elide-head-headers-to-hide): Remove redundant :group arg. (elide-head-overlay): Use `defvar-local'. (elide-head-show): Fix docstring. * test/lisp/elide-head-tests.el: New file with tests for elide-head.el.
120 lines
4.1 KiB
EmacsLisp
120 lines
4.1 KiB
EmacsLisp
;;; elide-head.el --- hide headers in files -*- lexical-binding: t; -*-
|
|
|
|
;; Copyright (C) 1999, 2001-2020 Free Software Foundation, Inc.
|
|
|
|
;; Author: Dave Love <fx@gnu.org>
|
|
;; Keywords: outlines tools
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software: you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation, either version 3 of the License, or
|
|
;; (at your option) any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;; Functionality for eliding boilerplate text (normally copyright
|
|
;; notices) in file headers to avoid clutter when you know what it
|
|
;; says.
|
|
;;
|
|
;; `elide-head-headers-to-hide' controls what is elided by the command
|
|
;; `elide-head'. A buffer-local invisible overlay manages the
|
|
;; elision.
|
|
|
|
;; You might add `elide-head' to appropriate major mode hooks or to
|
|
;; `find-file-hook'. Please do not do this in site init files. If
|
|
;; you do, information may be hidden from users who don't know it
|
|
;; already.
|
|
|
|
;; Note that `hs-minor-mode' will do a similar job by default, but
|
|
;; it's not selective about what leading commentary it hides.
|
|
|
|
;; Inspired by jwz's hide-copyleft.el, for which we don't have an
|
|
;; assignment.
|
|
|
|
;;; Code:
|
|
|
|
(defgroup elide-head nil
|
|
"Eliding copyright headers and the like in source files."
|
|
:version "21.1"
|
|
:prefix "elide-head"
|
|
:group 'tools)
|
|
|
|
(defcustom elide-head-headers-to-hide
|
|
'(("is free software[:;] you can redistribute it" . ; GNU boilerplate
|
|
"\\(Boston, MA 0211\\(1-1307\\|0-1301\\), USA\\|\
|
|
If not, see <https?://www\\.gnu\\.org/licenses/>\\)\\.")
|
|
("The Regents of the University of California\\. All rights reserved\\." .
|
|
"SUCH DAMAGE\\.") ; BSD
|
|
("Permission is hereby granted, free of charge" . ; X11
|
|
"authorization from the X Consortium\\."))
|
|
"Alist of regexps defining start and end of text to elide.
|
|
|
|
The cars of elements of the list are searched for in order. Text is
|
|
elided with an invisible overlay from the end of the line where the
|
|
first match is found to the end of the match for the corresponding
|
|
cdr."
|
|
:type '(alist :key-type (regexp :tag "Start regexp")
|
|
:value-type (regexp :tag "End regexp")))
|
|
|
|
(defvar-local elide-head-overlay nil)
|
|
|
|
;;;###autoload
|
|
(defun elide-head (&optional arg)
|
|
"Hide header material in buffer according to `elide-head-headers-to-hide'.
|
|
|
|
The header is made invisible with an overlay. With a prefix arg, show
|
|
an elided material again.
|
|
|
|
This is suitable as an entry on `find-file-hook' or appropriate mode hooks."
|
|
(interactive "P")
|
|
(if arg
|
|
(elide-head-show)
|
|
(save-excursion
|
|
(save-restriction
|
|
(let ((rest elide-head-headers-to-hide)
|
|
beg end)
|
|
(widen)
|
|
(goto-char (point-min))
|
|
(while rest
|
|
(save-excursion
|
|
(when (re-search-forward (caar rest) nil t)
|
|
(setq beg (point))
|
|
(when (re-search-forward (cdar rest) nil t)
|
|
(setq end (point-marker)
|
|
rest nil))))
|
|
(if rest (setq rest (cdr rest))))
|
|
(if (not (and beg end))
|
|
(if (called-interactively-p 'interactive)
|
|
(message "No header found"))
|
|
(goto-char beg)
|
|
(end-of-line)
|
|
(if (overlayp elide-head-overlay)
|
|
(move-overlay elide-head-overlay (point-marker) end)
|
|
(setq elide-head-overlay (make-overlay (point-marker) end)))
|
|
(overlay-put elide-head-overlay 'invisible t)
|
|
(overlay-put elide-head-overlay 'evaporate t)
|
|
(overlay-put elide-head-overlay 'after-string "...")))))))
|
|
|
|
(defun elide-head-show ()
|
|
"Show a header in the current buffer elided by \\[elide-head]."
|
|
(interactive)
|
|
(if (and (overlayp elide-head-overlay)
|
|
(overlay-buffer elide-head-overlay))
|
|
(delete-overlay elide-head-overlay)
|
|
(if (called-interactively-p 'interactive)
|
|
(message "No header hidden"))))
|
|
|
|
(provide 'elide-head)
|
|
|
|
;;; elide-head.el ends here
|