Matching subset patterns in split string results - ruby

Question

Here's a more complex one for me:
I have content like this being pulled into a jekyll post:
# Lorem ipsum dolor sit amet.
Consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore.
~
# Et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation.
~
# Ullamco laboris nisi.
Ut aliquip ex ea commodo consequat.
~
I'm pulling this into my layout like this: {{ post.content | jekreged: 1 | markdownify }}
Jekreged is a custom liquid plugin I wrote that splits the content based on the ~ and then specifies which piece to include. The layout requires ripping apart a post like that.
I am trying to adapt this to then run a subset of match commands that I can call specifically from the liquid tag.
here's the example (and the one not working) that I am trying to troubleshoot.
module Jekyll
module AssetFilter
def jekreged(input, chunk)
drugs = input.split("~")[chunk]
title = (drugs).match(/^#{1}.+$/)
jekreged = "#{title}"
end
end
end
Liquid::Template.register_filter(Jekyll::AssetFilter)
I get no output from this. What I would ideally like is to be able to specify "title" as a parameter from the liquid tag but I'm not sure how to connect that through into the plugin.
Long range version I'll have something like title = regmatch for title, body = ..., img = ...
Thanks for any and all help!

Answer 1

took a shot at it (in the future, some example inputs/outputs would go a long way).
module Jekyll
module AssetFilter
def jekreged(input, matcher)
titles = input.split("\n~\n").select { |title| title.include? matcher }
if titles.size > 1
raise "Can't determine title from #{matcher.inspect}, found #{titles.inspect}"
elsif titles.size.zero?
raise "#{matcher.inspect} didn't match any of #{titles.inspect}"
end
titles.first
end
end
end
describe 'jekreged' do
include Jekyll::AssetFilter
let(:titles) { <<-TITLES.gsub /^ /, "" }
# Lorem ipsum dolor sit amet.
Consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore.
~
# Et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation.
~
# Ullamco laboris nisi.
Ut aliquip ex ea commodo consequat.
~
TITLES
it 'finds the title that has the string in it' do
jekreged(titles, "Consectetur" ).should == "# Lorem ipsum dolor sit amet.\nConsectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore."
jekreged(titles, "minim veniam").should == "# Et dolore magna aliqua.\nUt enim ad minim veniam, quis nostrud exercitation."
jekreged(titles, "aliquip" ).should == "# Ullamco laboris nisi.\nUt aliquip ex ea commodo consequat."
end
it 'raises an error if there is more than one title that matches' do
expect { jekreged titles, 'Ut' }.to raise_error /Can't determine title/
end
it 'raises an error if there are no titles that match' do
expect { jekreged titles, 'asdfasdfasdf' }.to raise_error /didn't match/
end
end