Add basic support for Elfeed

2 files changed, 79 insertions, 0 deletions

diff --git a/piem-elfeed.el b/piem-elfeed.el
new file mode 100644
index 0000000..e03104f
--- /dev/null
+++ b/piem-elfeed.el
@@ -0,0 +1,75 @@
+;;; piem-elfeed.el --- Elfeed integration for piem  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020  Kyle Meyer
+
+;; Author: Kyle Meyer <kyle@kyleam.com>
+;; Keywords: vc, tools
+;; Version: 0.0.0
+;; 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/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'elfeed)
+(require 'piem)
+
+(defgroup piem-elfeed nil
+  "Elfeed integration for piem."
+  :link '(info-link "(piem)Elfeed integration")
+  :group 'piem)
+
+(defvar piem-elfeed--link-re
+  (rx "/" (group (one-or-more (not (any "/" "\n"))))
+      "/" (group (one-or-more (not (any "/" "\n"))))
+      "/" string-end))
+
+(defun piem-elfeed-get-inbox ()
+  "Return inbox name from an `elfeed-show-mode' buffer."
+  (when (derived-mode-p 'elfeed-show-mode)
+    (when-let ((link (elfeed-entry-link elfeed-show-entry)))
+      (and (string-match piem-elfeed--link-re link)
+           (match-string 1 link)))))
+
+(defun piem-elfeed-get-mid ()
+  "Return the message ID of an `elfeed-show-mode' buffer."
+  (when (derived-mode-p 'elfeed-show-mode)
+    (when-let ((link (elfeed-entry-link elfeed-show-entry)))
+      (and (string-match piem-elfeed--link-re link)
+           (match-string 2 link)))))
+
+;; No function is defined for `piem-mid-to-thread-functions'.  All
+;; callers should fall back to getting the thread from a public-inbox
+;; instance.
+
+(define-minor-mode piem-elfeed-mode
+  "Toggle Elfeed support for piem.
+With a prefix argument ARG, enable piem-elfeed mode if ARG is
+positive, and disable it otherwise.  If called from Lisp, enable
+the mode if ARG is omitted or nil."
+  :global t
+  :init-value nil
+  (if piem-elfeed-mode
+      (progn
+        (add-hook 'piem-get-inbox-functions #'piem-elfeed-get-inbox)
+        (add-hook 'piem-get-mid-functions #'piem-elfeed-get-mid))
+    (remove-hook 'piem-get-inbox-functions #'piem-elfeed-get-inbox)
+    (remove-hook 'piem-get-mid-functions #'piem-elfeed-get-mid)))
+
+;;; piem-elfeed.el ends here
+(provide 'piem-elfeed)
diff --git a/piem.texi b/piem.texi
index c778cd2..e861bb8 100644
--- a/piem.texi
+++ b/piem.texi
@@ -48,6 +48,7 @@ This manual is for piem version @value{VERSION}.
 * b4 interface::
 * Notmuch integration::
 * Gnus integration::
+* Elfeed integration::
 * Related tools::
 * Contributing::
 
@@ -76,6 +77,9 @@ Indices
 @node Gnus integration
 @chapter Gnus integration
 
+@node Elfeed integration
+@chapter Elfeed integration
+
 @node Related tools
 @chapter Related tools