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require File.dirname(__FILE__) + '/options'
module Rails
module Generator
module Scripts
# Generator scripts handle command-line invocation. Each script
# responds to an invoke! class method which handles option parsing
# and generator invocation.
class Base
include Options
default_options :collision => :ask, :quiet => false
# Run the generator script. Takes an array of unparsed arguments
# and a hash of parsed arguments, takes the generator as an option
# or first remaining argument, and invokes the requested command.
def run(args = [], runtime_options = {})
begin
parse!(args.dup, runtime_options)
rescue OptionParser::InvalidOption => e
# Don't cry, script. Generators want what you think is invalid.
end
# Generator name is the only required option.
unless options[:generator]
usage if args.empty?
options[:generator] ||= args.shift
end
# Look up generator instance and invoke command on it.
Rails::Generator::Base.instance(options[:generator], args, options).command(options[:command]).invoke!
rescue => e
puts e
puts " #{e.backtrace.join("\n ")}\n" if options[:backtrace]
raise SystemExit
end
protected
# Override with your own script usage banner.
def banner
"Usage: #{$0} generator [options] [args]"
end
def usage_message
usage = "\nInstalled Generators\n"
Rails::Generator::Base.sources.inject([]) do |mem, source|
# Using an association list instead of a hash to preserve order,
# for aesthetic reasons more than anything else.
label = source.label.to_s.capitalize
pair = mem.assoc(label)
mem << (pair = [label, []]) if pair.nil?
pair[1] |= source.names
mem
end.each do |label, names|
usage << " #{label}: #{names.join(', ')}\n" unless names.empty?
end
usage << <<end_blurb
You can also install additional generators for your own use:
1. Download, for example, login_generator.zip
2. Unzip to directory #{Dir.user_home}/.rails/generators/login
to use the generator with all your Rails apps
end_blurb
if Object.const_defined?(:RAILS_ROOT)
usage << <<end_blurb
or to #{File.expand_path(RAILS_ROOT)}/lib/generators/login
to use with this app only.
end_blurb
end
usage << <<end_blurb
3. Run generate with no arguments for usage information
#{$0} login
Generator gems are also available:
1. gem search -r generator
2. gem install login_generator
3. #{$0} login
end_blurb
return usage
end
end # Base
end
end
end
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