reed

reed

A Markdown-based blogging core backed by Redis and the filesystem.

Features:

• Asynchronously turn all markdown (.md) files in a directory into a blog stored in the hyper-fast Redis database.
• Files are watched for changes and the Redis store is automagically updated.
• Transparently access Redis or the filesystem to find a blog post.
• Markdown metadata to describe your blog posts.
• Fully event-based programming paradigm.

In the works:

• Comments

What is reed?

Reed is a (very) lightweight blogging core that turns markdown files in a directory into a blog. It is not a fully featured blogging system. If you are looking for that, check out Wheat or another blog engine.

Reed is intended for developers who want to integrate simple blogging functionality into their node.js website or application. It makes as little assumptions as possible about your environment in order to give maximum flexibility.

How to use reed

First, install it:

npm install reed

Make sure Redis 2.2 or greater is also installed and running. Currently, reed only supports the basic (non-authenticated) model for Redis. After Redis and reed are installed, use it thus:

var reed = require("reed");
reed.on("ready", function() {
	//ready.
	reed.get("a post", function(err, metadata, html) {
		//you have a post.
	});
});

reed.open("."); //looks for .md files in current directory.

In the above example, .md files will be pulled out of the current directory and indexed into the Redis database by the index function. After having indexed them, we can list the titles in order of post/updated date (that is, last modified date).

To retrieve an individual post and its associated metadata, use the get function:

reed.get("First Post", function(err, metadata, htmlContent) {
	console.log(JSON.stringify(metadata);
	console.log(htmlContent);
});

If retrieval of the post was successful, err will be null. metadata will be an object containing a markdown property that stores the original markdown text, a lastModified property that stores the last modified date as UNIX epoch time, plus any user-defined information (see below). htmlContent will be the post content, converted from markdown to HTML.

If the post could not be retrieved, err will be an object containing error information (exactly what depends on the error thrown), and other two objects will be undefined.

Note that the get function will hit the Redis database first, and then look on the filesystem for a title. So, if you have a new post that has not yet been indexed, it will get automagically added to the index via get.

Article Naming and Metadata

Every article in the blog is a markdown file in the specified directory. The filename is considered the "id" or "slug" of the article, and must be named accordingly. Reed article ids must have no spaces. Instead, spaces are mapped from -s:

"the first post" -> the-first-post.md

These ids are case sensitive, so The-First-Post.md is different than the-first-post.md.

Metadata

Like Wheat, articles support user-defined metadata at the top of the article. These take the form of simple headers. They are transferred into the metadata object as properties.

the-first-post.md:

Title: The First Post
Author: me
SomeOtherField: 123skidoo

The headers will be accessible thus:

• metadata.title
• metadata.author
• metadata.someotherfield

Field names can only alphabetical characters. So, "Some-Other-Field" is not a valid article header.

API

Reed exposes the following functions:

• open(dir): Opens the given path for reed. When first opened, reed will scan the directory for .md files and add them to redis.
• close(): Closes reed, shuts down the Redis connection, stops watching all .md files, and clears up state.
• get(id, callback): Retrieves a blog post. The callback receives error, metadata, and htmlContent.
• getMetadata(id, callback): Retrieves only the metadata for a blog post. The callback receives error (if there was an error), and metadata, an object containing the metadata from the blog post.
• list(callback): Retrieves all post IDs, sorted by last modified date. The callback receives error if there was an error, and titles, which is a list of post IDs.
• remove(id, callback): Removes a blog post. The callback receives error, if an error occurred.
• removeAll(callback): Removes all blog posts. The callback is called after all posts have been deleted, and receives error if there was an error during deletion. This deletion is not transactional!
• index(callback): Forces a full refresh of the opened directory. This should usually not be necessary, as reed should automatically take care of posts being added and updated. The callback receives error if indexing was prematurely interrupted by an error.

Note: get, list, index, remove, and removeAll asynchronously block until reed is in a ready state. This means they can be called before open, and they will run after opening has completed.

Reed exposes the following events:

• error: Fired when there is an error in certain internal procedures. Usually, inspecting the error object of a callback will be sufficient.
• ready: Fired when reed has loaded.
• add: Fired when a post is added to the blog. Note: posts updated while reed is not running are currently considered add events.
• update: Fired when a blog post is updated while reed is running. Note; posts updated while reed is not running are currently considered add events.