Add blog section

- Add a ‘posts/index.org’ that just includes all of the posts and only exports
  headings tagged with ‘summary’.

- Add summaries to all posts.

- Rename posts to include the date and time in the file name.

- Add an RSS feed from the new ‘posts/index.org’

Unfortunately generating an RSS feed from the ‘index.org’ doesn't work, so this
experiment is at a dead end for now.

.gitignore

@@ -1,7 +1,6 @@
 /.cask
 /public
 /.org-timestamps
-/posts/index.org*
 
 # Added automatically by `eldev init'.
 /.eldev

posts/20160221-0000-wdocker-compose.org

@@ -3,6 +3,7 @@
 #+STARTUP: showall
 #+FILETAGS: wdocker docker docker-compose
 #+OPTIONS: num:nil toc:nil
+#+exclude_tags: summary
 
 [[https://github.com/babab/wdocker][wdocker]] is a little utility written by a [[https://benjamin.althu.es][friend]] and former colleague
 of mine. It allows you to define commands for it in a
@@ -159,3 +160,9 @@ before:
   variables becomes too much for you, you can call the wdocker command
   without arguments to see the commands you defined and the shell
   commands they'll run.
+
+* Making docker-compose easier with wdocker               :summary:
+
+So easy!
+
+[[file:20160221-0000-wdocker-compose.org][Read More]]

posts/20191006-1255-new-blog.org

@@ -1,10 +1,17 @@
 #+TITLE: New Blog
 #+DATE: <2019-10-06 Sun 12:55>
+#+exclude_tags: summary
+
+* New Blog                                                :summary:
 
 It's that time again... I've started a new project to build and maintain my site
 and of course it has to come with a new blog post. I'm trying to have it
 generate an index based on the files in this directory.
 
+[[file:20191006-1255-new-blog.org][Read More]]
+
+* All the meta
+
 I don't want it to include anything beyond the first paragraph, though. Now I
 need to write some content so that it doesn't stay at a 1 minute read. If the
 average reading speed is 225 words per minute (it's probably not, but that's

posts/20191006-1818-my-new-emacs-configuration.org

@@ -0,0 +1,15 @@
+#+TITLE: My new Emacs configuration
+#+DATE: <2019-10-06 Sun 18:18>
+#+FILETAGS: draft
+#+exclude_tags: summary
+
+* My new Emacs configuration                              :summary:
+
+I'm still working on this one.
+
+[[file:20191006-1818-my-new-emacs-configuration.org][Read More]]
+
+* Setup
+
+foo bar baz
+ soo

posts/20200223-1828-a-very-important-blog-post.org

@@ -0,0 +1,13 @@
+#+TITLE: A very important blog post
+#+DATE: <2020-02-23 Sun 18:28>
+#+exclude_tags: summary
+
+* A very important blog post                              :summary:
+
+Very important business here.
+
+[[file:20200223-1828-a-very-important-blog-post.org][Read More]]
+
+* Other content
+
+There is more here than what you can see.

posts/20230412-0702-paredit-and-ielm.org

@@ -2,8 +2,10 @@
 #+TAGS: emacs
 #+COMMENT_STATUS: closed
 #+STATUS: publish
-#+DATE: Wed, 12 Apr 2023 07:02:45 GMT
+# #+DATE: Wed, 12 Apr 2023 07:02:45 GMT
+#+DATE: <2023-04-12 Wed 07:02>
 #+UPDATE_URL: /admin/modify-post/2023%252f04%252f12%252fielm-paredit
+#+exclude_tags: summary
 
 For a while I've been bothered by being unable to use IELM to evaluate Emacs Lisp expressions. Then [[https://www.n16f.net/blog/making-ielm-more-comfortable/][Making IELM More Comfortable]] pointed out that using paredit in IELM causes the =RET= and =C-j= keybindings to be bound to the wrong functions and proposes to fix them. The given fix, however, appears to change the keybindings for all buffers using paredit. I don't want that, and Emacs can do better!
 
@@ -24,3 +26,9 @@ A quick search yielded [[https://stackoverflow.com/a/13102821][Buffer-locally ov
 #+end_src
 
 Defining =RET= and =C-j= as =nil= means that the keybinding defaults back to the major-mode keybinding.
+
+* IELM & Paredit                                          :summary:
+
+I couldn't use IELM for a while because of Paredit. So I fixed it.
+
+[[file:20230412-0702-paredit-and-ielm.org][Read More]]

posts/20230610-0556-switch-todo-state-when-clocking-in.org

@@ -6,6 +6,7 @@
 #+status: publish
 #+UPDATE_URL: /admin/modify-post/2023%252f07%252f10%252fswitch-todo-state-when-clocking-in
 #+DATE: Mon, 10 Jul 2023 05:56:39 GMT
+#+exclude_tags: summary
 
 This Emacs configuration snippet for org-mode changes a task's state from whatever “head” state it's in into the next state in its sequence when you clock in to a task. I do this by setting the =org-clock-in-switch-to-state= variable.
 
@@ -76,6 +77,12 @@ Finally you just set this function as the value of =org-clock-in-switch-to-state
   (setq org-clock-in-switch-to-state #'oni-org-maybe-change-todo-state)
 #+end_src
 
+* Switch TODO state when clocking in                      :summary:
+
+For a while I wanted to automatically mark a task as in progress whenever I clocked in to it.
+
+[[file:20230610-0556-switch-todo-state-when-clocking-in.org][Read More]]
+
 * Footnotes
 
 [fn:1] By which I mean by pressing =C-c C-t= when =org-use-fast-todo-selection= is =nil= or pressing =C-S-<right>= on the headline.

posts/a-very-important-blog-post.org

@@ -1,4 +0,0 @@
-#+TITLE: A very important blog post
-#+DATE: <2020-02-23 Sun 18:28>
-
-Very important business here.

posts/index.org

@@ -0,0 +1,10 @@
+#+title: posts
+#+select_tags: summary
+#+options: tags:nil num:nil
+
+#+include: "./20230610-0556-switch-todo-state-when-clocking-in.org::*Switch TODO state when clocking in"
+#+include: "./20230412-0702-paredit-and-ielm.org::*IELM & Paredit"
+#+include: "./20200223-1828-a-very-important-blog-post.org::*A very important blog post"
+#+include: "./20191006-1818-my-new-emacs-configuration.org::*My new Emacs configuration"
+#+include: "./20191006-1255-new-blog.org::*New Blog"
+#+include: "./20160221-0000-wdocker-compose.org::*Making docker-compose easier with wdocker"

posts/my-new-emacs-configuration.org

@@ -1,8 +0,0 @@
-#+TITLE: My new Emacs configuration
-#+DATE: <2019-10-06 Sun 18:18>
-#+FILETAGS: draft
-
-I'm still working on this one.
-
-foo bar baz
- soo

publish.el

@@ -5,7 +5,7 @@
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords:
 ;; Version: 1
-;; Package-Requires: (dockerfile-mode htmlize org org-contrib rainbow-delimiters)
+;; Package-Requires: (dockerfile-mode htmlize org org-contrib rainbow-delimiters ox-rss)
 
 ;; 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
@@ -29,6 +29,7 @@
 (require 'dockerfile-mode)
 (require 'ob-dot)
 (require 'ox-publish)
+(require 'ox-rss)
 (require 'rainbow-delimiters)
 (require 'subr-x)
 
@@ -90,10 +91,20 @@
          :html-head "<link rel=\"stylesheet\" href=\"/assets/css/main.css\" type=\"text/css\"/>"
          :html-preamble (lambda (project)
                           (let ((buffer (find-file-noselect (buffer-file-name))))
-                            (unless (string= "ryuslash.org"
-                                             (car (org-publish-find-property (buffer-file-name) :title project)))
+                            (unless (member (car (org-publish-find-property (buffer-file-name) :title project))
+                                             '("ryuslash.org" "posts"))
                               (publish-format-reading-time
                                (publish-calculate-reading-time buffer))))))
+        ("rss"
+         :base-directory "posts/"
+         :base-extension "org"
+         :rss-extension "xml"
+         :publishing-directory "public/posts/"
+         :publishing-function (org-rss-publish-to-rss)
+         :section-numbers nil
+         :exclude ".*"
+         :include ("index.org")
+         :table-of-contents nil)
         ("assets"
          :base-directory "."
          :recursive t
@@ -101,7 +112,7 @@
          :base-extension "svg\\|png\\|jpg"
          :publishing-function org-publish-attachment
          :publishing-directory "public/")
-        ("all" :components ("index" "assets"))))
+        ("all" :components ("index" "posts" "rss" "assets"))))
 
 (defvar publish-feed-url-format
   ;"https://gitlab.com/ryuslash/ryuslash.org/-/commits/master/%s?feed_token=Rf8otgpS8YEiYakJN4NR&format=atom"