Recently I came across the need to parse a bit of a config file, in this kind of format: “Category=filetype;…” Here is how one would do such a thing using split, inject and map.

raw_config = "Image=jpg,tiff,png;Document=docx,doc,pdf;Other=rb,cs,c;"
 
config = raw_config.split(";").inject({}) do |result, fragment|
  type, extensions = fragment.split("=")
  result[type.strip.downcase.to_sym] = extensions.split(",").map{ |s| s.strip }
  result
end

The result is a hash where you can get an array of the file extensions for a given category like this
config[:image]
and the resulting hash looks like this:

{
  :image => ["jpg", "tiff", "png"],
  :document => ["docx", "doc", "pdf"],
  :other => ["rb", "cs", "c"]
}

Let me know in the comments if you have a better way!

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