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