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#!/usr/bin/env ruby
#
# Base class for importers written in Ruby
#
# Copyright (C) 2014 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
require 'json'
require 'logger'
require 'optparse'
require 'yaml'
module Importer
class Base
private
def create_option_parser(banner, description)
opts = OptionParser.new
opts.banner = banner
opts.on('-?', '--help', 'print this help') do
puts opts
print "\n", description
exit 255
end
end
def log
@logger ||= create_logger
end
def error(message)
log.error(message)
STDERR.puts(message)
end
def local_data_path(file)
# Return the path to 'file' relative to the currently running program.
# Used as a simple mechanism of finding local data files.
script_dir = File.dirname(__FILE__)
File.join(script_dir, file)
end
def write_lorry(file, lorry)
format_options = { :indent => ' ' }
file.puts(JSON.pretty_generate(lorry, format_options))
end
def write_morph(file, morph)
file.write(YAML.dump(morph))
end
def write_dependencies(file, dependencies)
format_options = { :indent => ' ' }
file.puts(JSON.pretty_generate(dependencies, format_options))
end
def create_logger
# Use the logger that was passed in from the 'main' import process, if
# detected.
log_fd = ENV['MORPH_LOG_FD']
if log_fd
log_stream = IO.new(Integer(log_fd), 'w')
logger = Logger.new(log_stream)
logger.level = Logger::DEBUG
logger.formatter = proc { |severity, datetime, progname, msg| "#{msg}\n" }
else
logger = Logger.new('/dev/null')
end
logger
end
end
end
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