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jmail-font-lock.el
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jmail-font-lock.el
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;;; jmail-font-lock.el --- XXXX
;; Copyright (C) 2019 Julien Masson.
;; Author: Julien Masson
;; URL: https://github.com/JulienMasson/jmail
;; Created: 2019-07-12
;;; License
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'diff-mode)
(require 'message)
;;; Faces
(defface jmail-font-lock-cited-0-face
'((t :inherit font-lock-variable-name-face :bold nil :italic t))
"Face for cited message parts (level 0)."
:group 'jmail)
(defface jmail-font-lock-cited-1-face
'((t :inherit font-lock-preprocessor-face :bold nil :italic t))
"Face for cited message parts (level 1)."
:group 'jmail)
(defface jmail-font-lock-cited-2-face
'((t :inherit font-lock-constant-face :bold nil :italic t))
"Face for cited message parts (level 2)."
:group 'jmail)
(defface jmail-font-lock-cited-3-face
'((t :inherit font-lock-function-name-face :bold nil :italic t))
"Face for cited message parts (level 3)."
:group 'jmail)
(defface jmail-font-lock-cited-4-face
'((t :inherit font-lock-type-face :bold nil :italic t))
"Face for cited message parts (level 4)."
:group 'jmail)
(defface jmail-font-lock-cited-5-face
'((t :inherit font-lock-comment-face :bold nil :italic t))
"Face for cited message parts (level 5)."
:group 'jmail)
(defface jmail-font-lock-cited-6-face
'((t :inherit font-lock-comment-delimiter-face :bold nil :italic t))
"Face for cited message parts (level 6)."
:group 'jmail)
;;; Internal Functions
(defun jmail-font-lock--diff-beginning ()
(save-excursion
(goto-char (jmail-view-eoh-mail-point))
(re-search-forward "^diff \-\-git" nil t)))
(defun jmail-font-lock--diff-matcher (regexp)
`(lambda (limit)
(when-let ((diff-beg (jmail-font-lock--diff-beginning)))
(and (> (point) diff-beg)
(re-search-forward ,regexp limit t)))))
(defun jmail-font-lock--cited-face ()
(when-let* ((str (buffer-substring (line-beginning-position) (point)))
(level (mod (string-width (replace-regexp-in-string
"^\\(>*\\).*" "\\1" str)) 7)))
(intern-soft (format "jmail-font-lock-cited-%d-face" level))))
;;; External Variables
(defun jmail-message-match-to-eoh (_limit)
(let ((eoh (jmail-view-eoh-mail-point)))
(when (< (point) eoh)
(set-match-data (list (point) eoh))
(point))))
(defvar jmail-font-lock-message
(let ((content "[ \t]*\\(.+\\(\n[ \t].*\\)*\\)\n?"))
`((jmail-message-match-to-eoh
(,(concat "^\\([Tt]o:\\)" content)
(progn (goto-char (match-beginning 0)) (match-end 0)) nil
(1 'message-header-name)
(2 'message-header-to nil t))
(,(concat "^\\(^[GBF]?[Cc][Cc]:\\|^[Rr]eply-[Tt]o:\\)" content)
(progn (goto-char (match-beginning 0)) (match-end 0)) nil
(1 'message-header-name)
(2 'message-header-cc nil t))
(,(concat "^\\([Ss]ubject:\\)" content)
(progn (goto-char (match-beginning 0)) (match-end 0)) nil
(1 'message-header-name)
(2 'message-header-subject nil t))
(,(concat "^\\([Nn]ewsgroups:\\|Followup-[Tt]o:\\)" content)
(progn (goto-char (match-beginning 0)) (match-end 0)) nil
(1 'message-header-name)
(2 'message-header-newsgroups nil t))
(,(concat "^\\(X-[A-Za-z0-9-]+:\\|In-Reply-To:\\)" content)
(progn (goto-char (match-beginning 0)) (match-end 0)) nil
(1 'message-header-name)
(2 'message-header-xheader))
(,(concat "^\\([A-Z][^: \n\t]+:\\)" content)
(progn (goto-char (match-beginning 0)) (match-end 0)) nil
(1 'message-header-name)
(2 'message-header-other nil t)))
,@(if (and mail-header-separator
(not (equal mail-header-separator "")))
`((,(concat "^\\(" (regexp-quote mail-header-separator) "\\)$")
1 'message-separator))
nil)
("<#/?\\(multipart\\|part\\|external\\|mml\\|secure\\)[^>]*>"
(0 'message-mml)))))
(defvar jmail-font-lock-diff
`((,(jmail-font-lock--diff-matcher "^\\(---\\|\\+\\+\\+\\).*")
(0 'diff-file-header))
(,(jmail-font-lock--diff-matcher "^@@.*")
(0 'diff-header))
(,(jmail-font-lock--diff-matcher "^\\+.*")
(0 'diff-added))
(,(jmail-font-lock--diff-matcher "^\\-.*")
(0 'diff-removed))))
(defvar jmail-font-lock-cited
`(((lambda (limit)
(let ((body-beg (jmail-view-eoh-mail-point))
(regexp (concat "^\\(" message-cite-prefix-regexp "\\).*")))
(and (> (point) body-beg)
(re-search-forward regexp limit t))))
(0 (jmail-font-lock--cited-face)))))
(defvar jmail-font-lock (append jmail-font-lock-cited
jmail-font-lock-diff
jmail-font-lock-message))
(provide 'jmail-font-lock)