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# frozen_string_literal: true
module Mercenary
class Presenter
attr_accessor :command
# Public: Make a new Presenter
#
# command - a Mercenary::Command to present
#
# Returns nothing
def initialize(command)
@command = command
end
# Public: Builds a string representation of the command usage
#
# Returns the string representation of the command usage
def usage_presentation
" #{command.syntax}"
end
# Public: Builds a string representation of the options
#
# Returns the string representation of the options
def options_presentation
return nil unless command_options_presentation || parent_command_options_presentation
[command_options_presentation, parent_command_options_presentation].compact.join("\n")
end
def command_options_presentation
return nil if command.options.empty?
options = command.options
options -= command.parent.options if command.parent
options.map(&:to_s).join("\n")
end
# Public: Builds a string representation of the options for parent
# commands
#
# Returns the string representation of the options for parent commands
def parent_command_options_presentation
return nil unless command.parent
Presenter.new(command.parent).options_presentation
end
# Public: Builds a string representation of the subcommands
#
# Returns the string representation of the subcommands
def subcommands_presentation
return nil if command.commands.empty?
command.commands.values.uniq.map(&:summarize).join("\n")
end
# Public: Builds the command header, including the command identity and description
#
# Returns the command header as a String
def command_header
header = command.identity.to_s
header << " -- #{command.description}" if command.description
header
end
# Public: Builds a string representation of the whole command
#
# Returns the string representation of the whole command
def command_presentation
msg = []
msg << command_header
msg << "Usage:"
msg << usage_presentation
if opts = options_presentation
msg << "Options:\n#{opts}"
end
if subcommands = subcommands_presentation
msg << "Subcommands:\n#{subcommands_presentation}"
end
msg.join("\n\n")
end
# Public: Turn a print_* into a *_presentation or freak out
#
# meth - the method being called
# args - an array of arguments passed to the missing method
# block - the block passed to the missing method
#
# Returns the value of whatever function is called
def method_missing(meth, *args, &block)
if meth.to_s =~ %r!^print_(.+)$!
send("#{Regexp.last_match(1).downcase}_presentation")
else
# You *must* call super if you don't handle the method,
# otherwise you'll mess up Ruby's method lookup.
super
end
end
end
end
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