145 lines
5.1 KiB
EmacsLisp
145 lines
5.1 KiB
EmacsLisp
;;; gemini-mode.el --- A simple highlighting package for text/gemini -*- lexical-binding: t; -*-
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;; Copyright (C) 2020 Jason McBrayer
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;; Author: Jason McBrayer <jmcbray@carcosa.net>, tastytea <tastytea@tastytea.de>
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;; Created: 20 May 2020
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;; Version: 0.4.0
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;; Keywords: languages
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;; Homepage: https://git.carcosa.net/jmcbray/gemini.el
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;; Package-Requires: ((emacs "24.3"))
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;;; Commentary:
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;; This package provides a major mode for editing text/gemini files.
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;; Currently, it only provides syntax-highlighting support.
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;; This file is not part of GNU Emacs.
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU Affero General Public License as
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;; published by the Free Software Foundation, either version 3 of the
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;; License, or (at your option) any later version.
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;; This program 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 Affero General Public License for more details.
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;; You should have received a copy of the GNU Affero General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Code:
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(require 'cl-lib)
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(defface gemini-heading-face-1
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'((t :inherit bold :height 1.8))
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"Face for Gemini headings level 1"
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:group 'gemini-mode)
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(defface gemini-heading-face-2
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'((t :inherit bold :height 1.4))
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"Face for Gemini headings level 2"
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:group 'gemini-mode)
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(defface gemini-heading-face-3
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'((t :inherit bold :height 1.2))
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"Face for Gemini headings level 3"
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:group 'gemini-mode)
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(defface gemini-heading-face-rest
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'((t :inherit bold))
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"Face for Gemini headings below level 3"
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:group 'gemini-mode)
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(defvar gemini-highlights
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(let* ((gemini-heading-3-regexp "^###\s.*$")
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(gemini-heading-2-regexp "^##\s.*$")
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(gemini-heading-1-regexp "^#\s.*$")
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(gemini-heading-rest-regexp "^###+\s.*$")
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(gemini-link-regexp "^=>.*$")
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(gemini-ulist-regexp "^\\*")
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(gemini-preformatted-regexp "^```"))
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`((,gemini-heading-rest-regexp . 'gemini-heading-face-rest)
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(,gemini-heading-3-regexp . 'gemini-heading-face-3)
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(,gemini-heading-2-regexp . 'gemini-heading-face-2)
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(,gemini-heading-1-regexp . 'gemini-heading-face-1)
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(,gemini-link-regexp . 'link)
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(,gemini-ulist-regexp . 'font-lock-keyword-face)
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(,gemini-preformatted-regexp . 'font-lock-builtin-face)))
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"Font lock keywords for `gemini-mode'.")
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(defvar gemini-mode-map
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(let ((map (make-keymap)))
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(define-key map (kbd "C-c C-l") #'gemini-insert-link)
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(define-key map (kbd "C-c RET") #'gemini-insert-list-item)
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map)
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"Keymap for `gemini-mode'.")
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;; See RFC 3986 (URI).
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(defconst gemini-regex-uri
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"\\([a-zA-z0-9+-.]+:[^]\t\n\r<>,;() ]+\\)"
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"Regular expression for matching URIs.")
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(defun gemini-get-used-uris ()
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"Return a list of all used URIs in the buffer."
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(save-excursion
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(goto-char (point-min))
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(let (uris)
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(while (re-search-forward gemini-regex-uri nil t)
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(push (match-string 1) uris))
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uris)))
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(defun gemini-insert-link ()
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"Insert new link, with interactive prompts.
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If there is an active region, use the text as the default URL, if
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it seems to be a URL, or link text value otherwise."
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(interactive)
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(cl-multiple-value-bind (begin end text uri)
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(if (use-region-p)
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;; Use region as either link text or URL as appropriate.
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(let ((region (buffer-substring-no-properties
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(region-beginning) (region-end))))
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(if (string-match gemini-regex-uri region)
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;; Region contains a URL; use it as such.
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(list (region-beginning) (region-end)
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nil (match-string 1 region))
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;; Region doesn't contain a URL, so use it as text.
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(list (region-beginning) (region-end)
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region nil))))
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(let* ((used-uris (gemini-get-used-uris))
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(uri (completing-read "URL: "
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used-uris nil nil uri))
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(text (completing-read "Link text (blank for plain URL): "
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nil nil nil text)))
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(when (and begin end)
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(delete-region begin end))
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(insert "=> " uri)
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(unless (string= text "")
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(insert " " text)))))
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(defun gemini-insert-list-item ()
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"Insert a new list item.
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If at the beginning of a line, just insert it. Otherwise
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go to the end of the current line, insert a newline, and
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insert a list item."
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(interactive)
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(if (equal (line-beginning-position) (point))
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(insert "* ")
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(end-of-line)
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(newline)
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(insert "* ")))
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;;;###autoload
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(define-derived-mode gemini-mode text-mode "gemini"
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"Major mode for editing text/gemini 'geminimap' documents"
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(setq font-lock-defaults '(gemini-highlights))
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(visual-line-mode 1))
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;;;###autoload
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(progn
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(add-to-list 'auto-mode-alist '("\\.gmi\\'" . gemini-mode))
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(add-to-list 'auto-mode-alist '("\\.gemini\\'" . gemini-mode))
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(add-to-list 'auto-mode-alist '("\\.geminimap\\'" . gemini-mode)))
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(provide 'gemini-mode)
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;;; gemini-mode.el ends here
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