Class: OptionParser

Inherits:
Object
  • Object
show all
Defined in:
lib/option_parser.rb

Constant Summary collapse

LEFT = 
2
MIDDLE = 
30

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = ARGV) ⇒ OptionParser 



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# File 'lib/option_parser.rb', line 19

def initialize(args = ARGV)
    @args = args
    @banner = nil
    @flags = Array.new
end

Instance Attribute Details

#args ⇒ Object (readonly)

Returns the value of attribute args.



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# File 'lib/option_parser.rb', line 6

def args
  @args
end

Class Method Details

.get_empty_spaces ⇒ Object 



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# File 'lib/option_parser.rb', line 74

def self.get_empty_spaces
    " " * (MIDDLE + LEFT)
end

.last_arg(args = ARGV) ⇒ Object 



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# File 'lib/option_parser.rb', line 15

def self.last_arg(args = ARGV)
    args.length >= 1 ? args[args.length - 1] : nil
end

.parse(args = ARGV) {|parser| ... } ⇒ Object

Yields:

  • (parser) 


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# File 'lib/option_parser.rb', line 8

def self.parse(args = ARGV)
    parser = OptionParser.new
    yield parser
    parser.process args
    parser
end

Instance Method Details



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# File 'lib/option_parser.rb', line 25

def banner(banner)
    @banner = banner
end

#on(short_flag, long_flag, description, &block) ⇒ Object 



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# File 'lib/option_parser.rb', line 29

def on(short_flag, long_flag, description, &block)
    @flags << { short_flag: short_flag || '', long_flag: long_flag || '',
        description: description || '', block: block }
end

#process(args = ARGV) ⇒ Object 



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# File 'lib/option_parser.rb', line 34

def process( args = ARGV )
    unless args.length == 0
        args.each_with_index do |arg, i|
            @flags.each do |flag|
                name = -> (type_flag) do
                    flag[type_flag].gsub( /[a-z -]/, '' )
                end

                flag_strip = -> (type_flag) do
                    flag[type_flag].sub( name.(type_flag), '' ).strip()
                end
                has_flag = -> (type_flag) { arg == flag_strip.(type_flag) }

                if has_flag.(:short_flag) or
                has_flag.(:long_flag)

                    has_name = -> (type_flag) do
                        name.(type_flag) != ""
                    end
                    value = nil

                    if has_name.(:short_flag) or
                    has_name.(:long_flag)
                        value = args[i + 1]
                    end

                    flag[:block].call( value )
                end
            end
        end
    else
        @flags.each do |flag|
            if flag[:short_flag] == '-h' or flag[:long_flag] == '--help'
                flag[:block].call
                break
            end
        end
    end
end

#to_s ⇒ Object 



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# File 'lib/option_parser.rb', line 78

def to_s()
    io = Array.new
    if banner = @banner
        io << banner
        io << "\n"
    end
    
    @flags.each do |flag|
        l_flag = !flag[:long_flag].empty? ? ", #{flag[:long_flag]}" : ""
			flags = "#{flag[:short_flag]}#{l_flag}".ljust(MIDDLE)
			desc = flag[:description].gsub("\n", "\n#{OptionParser.get_empty_spaces}")
        io << "".ljust(LEFT) + flags + desc
        io << "\n"
    end

    io.join
end