convert markdown to hatena on coffee-script

md2hatena.coffee

#!/usr/bin/env node
 
content = []
 
process.stdin.setEncoding "utf8"
process.stdin.resume()
process.stdin.on "data", (chunk) ->
  content.push chunk
 
process.stdin.on "end", () ->
  process.stdout.write md2hatena content.join ""
  process.exit()
 
md2hatena = (text) ->
  # table none
  text = text.replace /((\|[:-]+?)+\|\n)/mg, (match) ->
    ""
 
  # pre none
  text = text.replace /^```(\w*)\n([\s\S]*?)\n```$/mg, (match, lang, content) ->
    ">|#{ lang }|\n#{ content }\n||<\n"
 
  # blockquote
  text = text.replace /^> ([\s\S]*?)\n\n/mg, (match, content) ->
    ">>\n#{ content }\n<<\n"
 
  # list
  text = text.replace /^((?:[ ]{2})+)\*/mg, (match, content) ->
    "#{ content.replace /[ ]{2}/g, '*' }-"
  text = text.replace /^([ ]{2})?(?:\*)/mg, (match, content) ->
    "#{ if content? then content.repalce /[ ]{2}/g, '*' else ''}-"
 
  text = text.replace /^((?:[ ]{2})+)\-/mg, (match, content) ->
    "#{ content.repalce /[ ]{2}/g, '-' }-"
  text = text.replace /^([ ]{2})?(?:[0-9]+\.)/mg, (match, content) ->
    "#{ if content then content.repalce /[ ]{2}/g, '+' else ''}+"
 
  # link
  text = text.replace /\[(.*?)\]\((https?:\/\/.*?)\)/mg, (match, label, href) ->
    "[#{ href }:title=#{ label }]"
 
  # headers
  text = text.replace /^([\#]{1,4})/mg, (match) -> match.replace(/#/g, '*')
 
  text