Texmate command: open markdown links

Follow Hyperlink.tmCommand.rb

#!/usr/bin/env ruby
# Texmate command: open markdown links
# <http://macromates.com/>
# [My favorite editor](http://macromates.com/)

idx = ENV['TM_LINE_INDEX'].to_i
line = ENV['TM_CURRENT_LINE']
alt_tokens = line.include?('<') && line.include?('>') 
b_token = alt_tokens ? '<' : '('
e_token = alt_tokens ? '>' : ')'
beginning = (idx - line[0,idx].reverse.index(b_token))
ending = line[idx,line.length].index(e_token) + idx - 1
link = line[beginning..ending]
`open #{link}`
 
# Input: Selected Text OR Scope
# Output: Discard
# Activation: Key Equivalent ^↘
# Scope Selector: markup.underline.link.markdown