Method: ALib::AbstractMain#usage

Defined in:
lib/alib-0.5.0/main.rb

#usage(port = STDERR) ⇒ Object

–}}}



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# File 'lib/alib-0.5.0/main.rb', line 501

def usage port = STDERR
#--{{{
  port << klass::usage << "\n" if(klass::usage and not klass::usage.empty?)
  port << klass::examples << "\n" if(klass::examples and not klass::examples.empty?)

  if klass::optspec 
    port << 'OPTIONS' << "\n"

    klass::optspec.each do |os| 
      a, b, c = os
      long, short, desc = nil
      [a,b,c].each do |word|
        next unless word
        word.strip!
        case word
          when %r/^--[^-]/o
            long = word
          when %r/^-[^-]/o
            short = word
          else
            desc = word
        end
      end

      spec = ((long and short) ? [long, short] : [long])

      if spec
        port << Util::columnize(spec.join(', '), :width => 80, :indent => 2)
        port << "\n"
      end

      if desc
        port << Util::columnize(desc, :width => 80, :indent => 8)
        port << "\n"
      end
    end

    port << "\n"
  end

  port
#--}}}
end