Class: Enparallel::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/enparallel/cli.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts, stdin) ⇒ CLI 



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# File 'lib/enparallel/cli.rb', line 3

def initialize(opts, stdin)
    @opts = opts
    @stdin = stdin
end

Class Method Details

.parse(argv, stdin) ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 16

def self.parse(argv, stdin)
    opts = Docopt.docopt(usage, argv: argv)

    if opts['--version']
        puts VERSION
        exit
    end

    new(opts, stdin)
end

.pick_default ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 12

def self.pick_default
    'sequential'
end

.program_name ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 27

def self.program_name
    File.basename($PROGRAM_NAME)
end

.usage ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 31

def self.usage
    "        Usage:\n            \#{program_name} [options] [--] <command>...\n            \#{program_name} --version\n\n        Description:\n            \#{program_name} operates by reading lines from standard input, and executing\n            <command> once per entry, in parallel.\n\n            The placeholder \"{}\", if present, is replaced with each line of input in turn.\n\n            seq 1 10 | enparallel sleep {}\n\n            To run a more complex command or to make use of shell functions or constructs\n            (enparallel runs its argument as a program) use a call to \"bash -c\". Note that\n            because of the \"-c\" you need to prefix the command with \"--\" to indicate the\n            end of parameters to enparallel.\n\n            seq 1 10 | enparallel -- bash -c \"sleep {} && echo Slept for {}\"\n\n        Options:\n            -w, --workers <n>   Batch into a pool of <n> workers [default: \#{workers_default}]\n            -p, --pick <type>   Task-picking rule (see \"Types\") [default: \#{pick_default}]\n            -v, --version       Show version\n\n        Types:\n            sequential          The order in which the tasks were queued\n            random              Random order\n    EOF\nend\n"

.workers_default ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 8

def self.workers_default
    Util.processor_count
end

Instance Method Details

#command ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 67

def command
    Command.from_a(@opts['<command>'])
end

#inputs ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 63

def inputs
    @inputs ||= @stdin.each_line.map(&:chomp)
end

#pick ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 75

def pick
    @opts['--pick'] || pick_default
end

#workers ⇒ Object 



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# File 'lib/enparallel/cli.rb', line 71

def workers
    @opts['--workers'].to_i || workers_default
end