namespace :guides do

desc 'Generate guides (for authors), use ONLY=foo to process just "foo.md"'
task :generate => 'generate:html'

namespace :generate do

  desc "Generate HTML guides"
  task :html do
    ENV["WARN_BROKEN_LINKS"] = "1" # authors can't disable this
    ruby "rails_guides.rb"
  end

  desc "Generate .mobi file. The kindlegen executable must be in your PATH. You can get it for free from http://www.amazon.com/kindlepublishing"
  task :kindle do
    unless `kindlerb -v 2> /dev/null` =~ /kindlerb 0.1.1/
      abort "Please `gem install kindlerb` and make sure you have `kindlegen` in your PATH"
    end
    unless `convert` =~ /convert/  
      abort "Please install ImageMagick`"
    end
    ENV['KINDLE'] = '1'
    Rake::Task['guides:generate:html'].invoke
  end
end

# Validate guides -------------------------------------------------------------------------
desc 'Validate guides, use ONLY=foo to process just "foo.html"'
task :validate do
  ruby "w3c_validator.rb"
end

desc "Show help"
task :help do
  puts <<-help

Guides are taken from the source directory, and the result goes into the output directory. Assets are stored under files, and copied to output/files as part of the generation process.

You can generate HTML, Kindle or both formats using the `guides:generate` task.

All this process is handled via rake tasks, here's a full list of them:

#{%x[rake -T]} Some arguments may be passed via environment variables:

WARNINGS=1
  Internal links (anchors) are checked, also detects duplicated IDs.

ALL=1
  Force generation of all guides.

ONLY=name
  Useful if you want to generate only one or a set of guides.

  Generate only association_basics.html:
    ONLY=assoc

  Separate many using commas:
    ONLY=assoc,migrations

GUIDES_LANGUAGE
  Use it when you want to generate translated guides in
  source/<GUIDES_LANGUAGE> folder (such as source/es)

EDGE=1
  Indicate generated guides should be marked as edge.

Examples:

$ rake guides:generate ALL=1
$ rake guides:generate EDGE=1
$ rake guides:generate:kindle EDGE=1
$ rake guides:generate GUIDES_LANGUAGE=es
  help
end

end

task :default => 'guides:help'