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;; bug-reference.el --- buttonize bug references -*- lexical-binding: t; -*-
;; Copyright (C) 2008-2020 Free Software Foundation, Inc.
;; Author: Tom Tromey <tromey@redhat.com>
;; Created: 21 Mar 2007
;; Keywords: 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:
;; This file provides minor modes for putting clickable overlays on
;; references to bugs. A bug reference is text like "PR foo/29292";
;; this is mapped to a URL using a user-supplied format.
;; Two minor modes are provided. One works on any text in the buffer;
;; the other operates only on comments and strings.
;;; Code:
(defgroup bug-reference nil
"Hyperlinking references to bug reports"
;; Somewhat arbitrary, by analogy with eg goto-address.
:group 'comm)
(defvar bug-reference-map
(let ((map (make-sparse-keymap)))
(define-key map [mouse-2] 'bug-reference-push-button)
(define-key map (kbd "C-c RET") 'bug-reference-push-button)
map)
"Keymap used by bug reference buttons.")
;; E.g., "https://gcc.gnu.org/PR%s"
(defvar bug-reference-url-format nil
"Format used to turn a bug number into a URL.
The bug number is supplied as a string, so this should have a single %s.
This can also be a function designator; it is called without arguments
and should return a string.
It can use `match-string' to get parts matched against
`bug-reference-bug-regexp', specifically:
1. issue kind (bug, patch, rfe &c)
2. issue number.
There is no default setting for this, it must be set per file.
If you set it to a symbol in the file Local Variables section,
you need to add a `bug-reference-url-format' property to it:
\(put \\='my-bug-reference-url-format \\='bug-reference-url-format t)
so that it is considered safe, see `enable-local-variables'.")
;;;###autoload
(put 'bug-reference-url-format 'safe-local-variable
(lambda (s)
(or (stringp s)
(and (symbolp s)
(get s 'bug-reference-url-format)))))
(defcustom bug-reference-bug-regexp
"\\([Bb]ug ?#?\\|[Pp]atch ?#\\|RFE ?#\\|PR [a-z+-]+/\\)\\([0-9]+\\(?:#[0-9]+\\)?\\)"
"Regular expression matching bug references.
The second subexpression should match the bug reference (usually a number)."
:type 'string
:version "24.3" ; previously defconst
:group 'bug-reference)
;;;###autoload
(put 'bug-reference-bug-regexp 'safe-local-variable 'stringp)
(defun bug-reference-set-overlay-properties ()
"Set properties of bug reference overlays."
(put 'bug-reference 'evaporate t)
(put 'bug-reference 'face 'link)
(put 'bug-reference 'mouse-face 'highlight)
(put 'bug-reference 'help-echo "mouse-1, C-c RET: visit this bug")
(put 'bug-reference 'keymap bug-reference-map)
(put 'bug-reference 'follow-link t))
(bug-reference-set-overlay-properties)
(defun bug-reference-unfontify (start end)
"Remove bug reference overlays from the region between START and END."
(dolist (o (overlays-in start end))
(when (eq (overlay-get o 'category) 'bug-reference)
(delete-overlay o))))
(defvar bug-reference-prog-mode)
(defun bug-reference-fontify (start end)
"Apply bug reference overlays to the region between START and END."
(save-excursion
(let ((beg-line (progn (goto-char start) (line-beginning-position)))
(end-line (progn (goto-char end) (line-end-position))))
;; Remove old overlays.
(bug-reference-unfontify beg-line end-line)
(goto-char beg-line)
(while (and (< (point) end-line)
(re-search-forward bug-reference-bug-regexp end-line 'move))
(when (or (not bug-reference-prog-mode)
;; This tests for both comment and string syntax.
(nth 8 (syntax-ppss)))
(let ((overlay (make-overlay (match-beginning 0) (match-end 0)
nil t nil)))
(overlay-put overlay 'category 'bug-reference)
;; Don't put a link if format is undefined
(when bug-reference-url-format
(overlay-put overlay 'bug-reference-url
(if (stringp bug-reference-url-format)
(format bug-reference-url-format
(match-string-no-properties 2))
(funcall bug-reference-url-format))))))))))
;; Taken from button.el.
(defun bug-reference-push-button (&optional pos _use-mouse-action)
"Open URL corresponding to the bug reference at POS."
(interactive
(list (if (integerp last-command-event) (point) last-command-event)))
(if (and (not (integerp pos)) (eventp pos))
;; POS is a mouse event; switch to the proper window/buffer
(let ((posn (event-start pos)))
(with-current-buffer (window-buffer (posn-window posn))
(bug-reference-push-button (posn-point posn) t)))
;; POS is just normal position.
(dolist (o (overlays-at pos))
;; It should only be possible to have one URL overlay.
(let ((url (overlay-get o 'bug-reference-url)))
(when url
(browse-url url))))))
;;;###autoload
(define-minor-mode bug-reference-mode
"Toggle hyperlinking bug references in the buffer (Bug Reference mode)."
nil
""
nil
(if bug-reference-mode
(jit-lock-register #'bug-reference-fontify)
(jit-lock-unregister #'bug-reference-fontify)
(save-restriction
(widen)
(bug-reference-unfontify (point-min) (point-max)))))
;;;###autoload
(define-minor-mode bug-reference-prog-mode
"Like `bug-reference-mode', but only buttonize in comments and strings."
nil
""
nil
(if bug-reference-prog-mode
(jit-lock-register #'bug-reference-fontify)
(jit-lock-unregister #'bug-reference-fontify)
(save-restriction
(widen)
(bug-reference-unfontify (point-min) (point-max)))))
(provide 'bug-reference)
;;; bug-reference.el ends here
|
