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Contents
module UserChoices
# A template class. Subclasses describe all the choices a user may
# make to affect the execution of the command, and the sources for
# those choices (such as the command line).
class Command
attr_reader :user_choices
def initialize
builder = ChoicesBuilder.new
add_sources(builder)
add_choices(builder)
@user_choices = builder.build
postprocess_user_choices
end
# Add sources such as EnvironmentSource, XmlConfigFileSource,
# and CommandLineSource to the ChoicesBuilder.
#
# Must be defined in a subclass.
def add_sources(builder); subclass_responsibility; end
# Add choices to the ChoicesBuilder. A choice is a symbol that ends up in the
# @user_choices hash. It may have a :default value and a :type, as well
# as an OptionParser-style description of command-line arguments.
#
# Must be defined in a subclass.
def add_choices(builder); subclass_responsibility; end
# After choices from all sources are collected into @user_choices, this
# method is called to do any postprocessing. Does nothing unless
# overridden.
def postprocess_user_choices
end
# Execute the command, using @user_choices for parameterization.
#
# Must be defined in a subclass.
def execute; subclass_responsibility; end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems