Better Jekyll Excerpts
When you use the built-in excerpt feature, Jekyll returns the first paragraph of text. It does this by looking for something called the excerpt_separator. The excerpt_separator defaults to
\n\n, which is ideal for most short posts.
Back in my LiveWriter days, it would use an HTML comment like
<!--more--> to designate where to break for an excerpt. Jekyll supports this as well. In your _config.yml file you can add:
Unfortunately, this now means that on every post, you need to enter
<!--more-->, even if you are OK with the default of the first paragraph. The alternative is to add
excerpt_separator: <!--more--> for each post you want to control the excerpt.
Adding the excerpt_separator when needed is slightly better, but still too manual for my tastes.
Instead, I wrote a small plugin you can drop in your _plugins directory.
Jekyll::Hooks.register :posts, :pre_render do |post|
if post.data['excerpt_separator'].nil? && post.content =~ /^(<!--\s*more\s*-->)$/
post.data["excerpt_separator"] = $1
post.data['excerpt'] = Jekyll::Excerpt.new(post)
For each post, when building, it looks to see if there is a
<!--more--> in the body. If it is found it sets it as the excerpt_separator. Otherwise, it uses the default