Add bin and edit workflow

bin/gems/mercenary-0.4.0/lib/mercenary/presenter.rb

@@ -0,0 +1,103 @@
+# 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