helper.coffee

# accessor: returns the article "a" or "an" depending on the context string. Eg. "Computer" will return "a"
# and "Elephant" will return "an". Can pass a hash option `capitalize` which will capitalize the article.
# usage: {{#article}}string{{/article}} outputs "a string"
Handlebars.registerHelper "article", (options) ->
   # options:  pass `capitalize` true to get a capital article
   string = options.fn(@)
   vowels = ['a', 'e', 'i', 'o', 'u']
   vowel = false
   letter = string.toLowerCase()[0]
   vowel = true for v in vowels when letter == v
   article = 'an ' if vowel
   article = 'a ' if not vowel
   article = _.str.capitalize(article) if options.hash?.capitalize
   return article + string