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;;; piem-lei.el --- lei integration for piem -*- lexical-binding: t; -*-
;; Copyright (C) 2021 Kyle Meyer <kyle@kyleam.com>
;; Author: Kyle Meyer <kyle@kyleam.com>
;; Keywords: vc, tools
;; Package-Requires: ((emacs "26.3"))
;; 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 <https://www.gnu.org/licenses/>.
;;; Code:
(require 'message)
(require 'piem)
(defgroup piem-lei nil
"lei integration for piem."
:group 'piem)
;;;; Message display
(defface piem-lei-show-header-name
'((t :inherit message-header-name))
"Face for header names in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-header-from
;; Given it's focused on sending, message.el unsurprisingly doesn't
;; define a -from.
'((t :inherit message-header-to))
"Face for From headers in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-header-to
'((t :inherit message-header-to))
"Face for To headers in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-header-cc
'((t :inherit message-header-cc))
"Face for Cc headers in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-header-other
'((t :inherit message-header-other))
"Face for all other headers in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-header-subject
'((t :inherit message-header-subject))
"Face for Subject headers in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-cited-text-1
'((t :inherit message-cited-text-1))
"Face for 1st-level cited text in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-cited-text-2
'((t :inherit message-cited-text-2))
"Face for 2nd-level cited text in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-cited-text-3
'((t :inherit message-cited-text-3))
"Face for 3rd-level cited text in `piem-lei-show-mode' buffers.")
(defface piem-lei-show-cited-text-4
'((t :inherit message-cited-text-4))
"Face for 4th-level cited text in `piem-lei-show-mode' buffers.")
(defun piem-lei-show--fontify-headers ()
(save-excursion
(let (last-value-face)
(while (looking-at
(rx line-start
(group (one-or-more (not (or ":" "\n"))) ":")
(group (one-or-more not-newline))))
(put-text-property
(match-beginning 1) (match-end 1)
'font-lock-face 'piem-lei-show-header-name)
(put-text-property
(match-beginning 2) (match-end 2)
'font-lock-face
(setq last-value-face
(pcase (downcase (match-string 1))
("cc:" 'piem-lei-show-header-cc)
("from:" 'piem-lei-show-header-from)
("subject:" 'piem-lei-show-header-subject)
("to:" 'piem-lei-show-header-to)
(_ 'piem-lei-show-header-other))))
(forward-line)
;; Handle values that continue onto next line.
(while (eq (char-after) ?\t)
(save-excursion
(skip-chars-forward "\t")
(put-text-property (point) (line-end-position)
'font-lock-face last-value-face))
(forward-line))))))
(defun piem-lei-show (mid &optional display)
"Show message for MID.
When called non-interactively, return the buffer but do not display it
unless DISPLAY is non-nil."
(interactive
(list (read-string "Message ID: " nil nil (piem-mid))
'display))
(with-current-buffer (get-buffer-create "*lei-show*")
(let ((inhibit-read-only t))
(erase-buffer)
(call-process "lei" nil '(t nil) nil
"q" "--format=text" (concat "m:" mid))
(goto-char (point-min))
(when (looking-at-p "# blob:")
(delete-region (line-beginning-position)
(1+ (line-end-position))))
(piem-lei-show-mode)
(piem-lei-show--fontify-headers))
(if display
(pop-to-buffer (current-buffer))
(current-buffer))))
(defvar piem-lei-show-mode-font-lock-keywords
'(("^> \\(.*\\)" 0 'piem-lei-show-cited-text-1)
("^>> \\(.*\\)" 0 'piem-lei-show-cited-text-2)
("^>>> \\(.*\\)" 0 'piem-lei-show-cited-text-3)
("^>>>> \\(.*\\)" 0 'piem-lei-show-cited-text-4))
"Font lock keywords for `piem-lei-show-mode'.")
(define-derived-mode piem-lei-show-mode special-mode "lei-show"
"Major mode for displaying message via lei."
:group 'piem-lei
(buffer-disable-undo)
(setq truncate-lines t)
(setq buffer-read-only t)
(setq font-lock-defaults (list piem-lei-show-mode-font-lock-keywords t))
(setq-local line-move-visual t))
;;; piem-lei.el ends here
(provide 'piem-lei)
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