cgit: Render org mode README files.

* guix/forge/cgit.scm: Import emacs-minimal from (gnu packages emacs).
(%cgit-readme): Add README.org.
(about-filter-gexp): Render org mode README files.
* guix/forge/org2html.el: New file.
* doc/forge.skb (Services)[Git web viewers]{cgit service}: Document
support for org mode README files.

1 files changed, 35 insertions, 0 deletions

diff --git a/guix/forge/org2html.el b/guix/forge/org2html.el
new file mode 100644
index 0000000..b311331
--- /dev/null
+++ b/guix/forge/org2html.el
@@ -0,0 +1,35 @@
+;;; guix-forge --- Guix software forge meta-service
+;;; Copyright © 2023 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of guix-forge.
+;;;
+;;; guix-forge 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.
+;;;
+;;; guix-forge 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 guix-forge.  If not, see
+;;; <https://www.gnu.org/licenses/>.
+
+(require 'ox-html)
+
+(setq org-export-with-section-numbers nil
+      org-export-with-toc nil)
+
+(defun pipe-stdin-into-current-buffer ()
+  (when-let (line (ignore-errors
+		    (read-from-minibuffer "")))
+    (insert line "\n")
+    (pipe-stdin-into-current-buffer)))
+
+;; TODO: Syntax highlight src code blocks using emacs-htmlize.
+(with-temp-buffer
+  (pipe-stdin-into-current-buffer)
+  (org-html-export-as-html nil nil nil t)
+  (princ (buffer-string)))