2017-11-12 23:48:21 +01:00
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;;; blog.el --- A simple org-mode & elnode blog software.
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;;; -*- lexical-binding: t; -*-
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(require 'elnode)
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(require 'f)
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2017-11-13 00:16:26 +01:00
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;; Definition of customization options
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(defgroup elblog nil
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"Configuration for the Emacs Lisp blog software"
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:link '(url-link "https://github.com/tazjin/elblog"))
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(defcustom elblog-port 8010
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"Port to run elblog's HTTP server on"
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:group 'elblog
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:type 'integer)
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(defcustom elblog-host "localhost"
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"Host for elblog's HTTP server to listen on"
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:group 'elblog
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:type 'string)
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2017-11-13 00:57:20 +01:00
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;; org-mode settings need to be configured a certain way for elblog's HTML
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;; templating to work correctly.
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(defun configure-org-html-export ()
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(setq org-html-postamble t)
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(setq org-html-doctype "html5")
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(setq org-html-head-include-scripts nil)
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(setq org-html-style-default (f-read-text "blog.css"))
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(setq org-html-preamble-format
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'(("en" "<header><h1><a class=\"unstyled-link\" href=\"/\">Tazjin's blog</a></h1><hr></header>")))
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(setq org-html-postamble-format `(("en" ,(f-read-text "postamble.html")))))
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2017-11-13 00:16:26 +01:00
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;; Article fetching & rendering functions
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2017-11-12 23:48:21 +01:00
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(defun render-org-buffer (buffer &optional force)
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"Renders an org-mode buffer as HTML and returns the name of the output buffer."
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(letrec ((input-buffer (get-buffer buffer))
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(output-buffer (concat buffer "-rendered"))
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;; Don't re-render articles unless forced.
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(must-render (or force
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(not (get-buffer output-buffer)))))
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(if (and input-buffer must-render)
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(with-current-buffer input-buffer
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(org-export-to-buffer 'html output-buffer nil nil t)))
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(if input-buffer output-buffer nil)))
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(defun get-buffer-string (buffer)
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"Returns the contents of the specified buffer as a string."
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(with-current-buffer (get-buffer buffer)
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(buffer-string)))
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(defvar-local article-not-found
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'(404 . "<html><body><p>Oh no, the article was not found.</p></body></html>"))
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(defvar-local text-html '("Content-Type" . "text/html"))
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(defun render-article (article)
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"Renders an article, if it exists."
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2017-11-13 00:57:20 +01:00
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(let ((output-buffer (render-org-buffer (concat article ".org") t)))
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2017-11-12 23:48:21 +01:00
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(if output-buffer `(200 . ,(get-buffer-string output-buffer))
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article-not-found)))
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(defun blog-post-handler (httpcon)
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"This handler servers a blog post from the configured blog post directory."
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(let ((response (render-article (elnode-http-mapping httpcon 1))))
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(elnode-http-start httpcon (car response) text-html)
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(elnode-http-return httpcon (cdr response))))
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2017-11-13 00:16:26 +01:00
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;; Web server implementation
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2017-11-12 23:48:21 +01:00
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(defvar-local elblog-routes
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'(("^.*//en/\\(.*\\)" . blog-post-handler)))
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(defun elblog-handler (httpcon)
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(elnode-hostpath-dispatcher httpcon elblog-routes))
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2017-11-12 23:56:27 +01:00
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(defun start-elblog ()
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(interactive)
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2017-11-13 00:57:20 +01:00
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(configure-org-html-export)
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2017-11-12 23:56:27 +01:00
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(elnode-start 'elblog-handler
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2017-11-13 00:16:26 +01:00
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:port elblog-port
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:host elblog-host))
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2017-11-12 23:56:27 +01:00
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(defun stop-elblog ()
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(interactive)
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2017-11-13 00:16:26 +01:00
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(elnode-stop elblog-port))
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