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require 'external_command'
module AlaveteliExternalCommand
class << self
def run(program_name, *args)
# Run an external program, and return its output.
# Standard error is suppressed unless the program
# fails (i.e. returns a non-zero exit status).
opts = {}
if !args.empty? && args[-1].is_a?(Hash)
opts = args.pop
end
xc = ExternalCommand.new(program_name, *args)
if opts.has_key? :append_to
xc.out = opts[:append_to]
end
xc.run()
if xc.status != 0
# Error
$stderr.puts("Error from #{program_name} #{args.join(' ')}:")
$stderr.print(xc.err)
return nil
else
if opts.has_key? :append_to
opts[:append_to] << "\n\n"
else
return xc.out
end
end
end
end
end
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