#!/usr/bin/env ruby

# @todo danielp 2013-07-29: I am tempted to assume mk is on RUBYLIB, but that
# doesn't work running from source; OTOH, this doesn't work if we *are*
# installed such that mk is on RUBYLIB, but we are in, eg, `/usr/bin`...
#
# So many ways this can go wrong. This seems the least-worst compromise to me.
begin
  require 'mk/script'
rescue LoadError
  require_relative '../lib/mk/script'
end

def usage(outcome, message = nil)
  message and puts message, ""

  puts <<EOT
usage: mk <command> [...]

Invoke an MK script command, and exit.  Available commands:

 * register

Register this node with the Razor server.  This submits facts and, if the
server has an action to be carried out, executes it locally.

 * execute <command> [args...]

Execute a Razor command.  This is used to run commands returned by the Razor
server, but could also be used to locally test custom commands.

 * config <value>

Print the <value> from the config system.

EOT
  exit outcome
end

# Figure out, and dispatch, to our command.
command = ARGV.shift or usage(false, 'No command was supplied')
MK::Script.respond_to?(command) or usage(false, "Unknown command #{command.inspect}")

result = false

begin
  result = MK::Script.send(command, *ARGV)
rescue Exception => e
  # This would otherwise catch SystemExit, which we kind of don't want to do.
  usage(false, "error running #{command}: #{e}")
end

exit result