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Versions: 14
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Contents
module Boxes
# Standardise handling the stdout and stderr from Open3.
#
# @example Print the values returned to stdout and stderr
# Boxes::Utils::Subprocess.run 'ls' do |stdout, stderr, thread|
# puts stdout unless stdout == nil
# puts stderr unless stderr == nil
# end
#
class Subprocess
# Create a new subprocess with a command, with a block for the response.
#
# @param cmd [String] the command to run
# @yield [stdout, stderr, thread] Gives the stdout, stderr and process
# thread to the block.
def self.run(command) # rubocop:disable Metrics/MethodLength
# see: http://stackoverflow.com/a/1162850/83386
Open3.popen3(command) do |_stdin, stdout, stderr, thread|
# read each stream from a new thread
{ out: stdout, err: stderr }.each do |key, stream|
Thread.new do
stream.each_line do |line|
# yield the block depending on the stream
if key == :out
yield line, nil, thread if block_given?
else
yield nil, line, thread if block_given?
end
end
end
end
thread.join # don't exit until the external process is done
thread.value
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems