gistfile1.rb

# Simplest (?) console action parsing that doesn't use gems.
# The idea, in a nutshell:
# 
# $ mycommand foo 
# 
# * Calls `foo` or a default method as per the ACTIONS constant (see below).
#
# $ mycommand foo bar
#
# * Calls `foo` with "bar" as a parameter.
#
# For a more complete example, check Shining's `shine` command at
# https://github.com/juliocesar/shining/blob/master/bin/shine
# Tres' is still a work in progress.


# A mapping for methods => <means to call method>. So if the user goes
# 
# $ mycommand server
#
# It'll map to the `server` method defined below. Arguments are passed directly
# to the method as they're laid in the console. So:
#
# $ mycommand init blah
#
# Will call the `init` method with "blah" being passed as argument.
ACTIONS = {
  :server   => %w(server),
  :new_at   => %w(build)
  :init     => %w(init start)
}

# Exit with status -2 and print a reason to the console
def bail! reason
  puts reason
  exit -2
end

# Core method that checks the console input, checks if there's a corresponding
# method in `ACTIONS`, and runs the respective method. Run the `new_at` method
# by default if passed a non-recognised parameter, so when you run
#
# $ mycommand facebook_killer
#
# it'll run `new_at` with "facebook_killer" as a parameter.
def figure_what_to_do!
  help_and_exit if ARGV.empty?
  if ACTIONS.values.flatten.include? ARGV.first
    action = ACTIONS.select { |action, args| args.include? ARGV.first }.flatten.first
    send action, *ARGV[1..(ARGV.length - 1)]
  else
    new_at ARGV.first
  end
end

# Prints usage help and exits with status -1.
def help_and_exit!
  STDERR.puts <<-HELP
Tres  \|/
  Usage:
    tres new <directory>
  Example:
    tres new myapp
  Other commands:
    help        shows this menu
    version     shows the current version of Tres you have installed
  HELP
  exit -1
end


# Define your own methods here.
def new_at
end

def server
end

def init
end

# Boot it!
figure_what_to_do!