Quick links to crop pages in Markdown.

lib/haml/filters/growstuff_markdown.rb

@@ -0,0 +1,31 @@
+require 'bluecloth'
+include ActionDispatch::Routing
+include Rails.application.routes.url_helpers
+
+module Haml::Filters
+  module GrowstuffMarkdown
+    include Haml::Filters::Base
+
+    def render(text)
+      bc = BlueCloth.new(text)
+      orig = bc.text
+
+      # turn [tomato](crop) into [tomato](http://growstuff.org/crops/tomato)
+      return orig.gsub(/\[(.*?)\]\(crop\)/) do |m|
+        crop_str = $1
+        crop = Crop.find_by_system_name(crop_str)
+        if crop
+          url = url_for(crop_path(crop))
+          "[#{crop_str}](#{url})"
+        else
+          crop_str
+        end
+      end
+    end
+  end
+
+# Register it as the handler for the :growstuff_markdown HAML command.
+# The automatic system gives us :growstuffmarkdown, which is ugly.
+defined['growstuff_markdown'] = GrowstuffMarkdown
+
+end

spec/lib/haml/filters/growstuff_markdown_spec.rb

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+require 'spec_helper'
+require 'haml/filters'
+require 'haml/filters/growstuff_markdown'
+# require 'haml/helpers'
+
+def input_link(name)
+  return "[#{name}](crop)"
+end
+
+def output_link(crop)
+  return "[#{crop.system_name}](#{crop_path(crop)})"
+end
+
+describe 'Haml::Filters::Growstuff_Markdown' do
+   it 'is registered as the handler for :growstuff_markdown' do
+     Haml::Filters::defined['growstuff_markdown'].should ==
+       Haml::Filters::GrowstuffMarkdown
+   end
+
+  it 'converts quick crop links' do
+    @crop = FactoryGirl.create(:crop)
+    rendered = Haml::Filters::GrowstuffMarkdown.render(input_link(@crop.system_name))
+    rendered.should eq output_link(@crop)
+  end
+
+  it "doesn't convert nonexistent crops" do
+    rendered = Haml::Filters::GrowstuffMarkdown.render(input_link("not a crop"))
+    rendered.should eq "not a crop"
+  end
+
+  it "handles multiple crop links" do
+    tomato = FactoryGirl.create(:tomato)
+    maize = FactoryGirl.create(:maize)
+    string = "#{input_link(tomato)} #{input_link(maize)}"
+    rendered = Haml::Filters::GrowstuffMarkdown.render(string)
+    rendered.should eq "#{output_link(tomato)} #{output_link(maize)}"
+  end
+
+end