Module: MiscHacks

Defined in:
lib/mischacks.rb,
lib/mischacks.rb

Overview

mischacks – Miscellaneous methods that may or may not be useful Copyright © 2009 Johan Kiviniemi

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Defined Under Namespace

Modules: ExceptionMixin Classes: ChildError

Constant Summary collapse

VERSION = 
'0.0.3'

Class Method Summary collapse

Class Method Details

.catching_exit(final_proc, fallthrough_status) ⇒ Object 



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# File 'lib/mischacks.rb', line 39

def self.catching_exit final_proc, fallthrough_status
  status = fallthrough_status

  begin
    yield
  rescue SystemExit => e
    status = e.status
  ensure
    final_proc.call status
  end

  status
end

.do_and_exit(status = 1, &block) ⇒ Object 



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# File 'lib/mischacks.rb', line 53

def self.do_and_exit status=1, &block
  catching_exit method(:exit), status, &block
end

.do_and_exit!(status = 1, &block) ⇒ Object 



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# File 'lib/mischacks.rb', line 57

def self.do_and_exit! status=1, &block
  catching_exit method(:exit!), status, &block
end

.fork_and_check ⇒ Object 



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# File 'lib/mischacks.rb', line 28

def self.fork_and_check
  fork do
    yield
  end.tap do |pid|
    _, status = Process.wait2 pid
    raise ChildError, status.exitstatus if status.exitstatus != 0
  end

  nil
end

.sh(cmd, *args) ⇒ Object 



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# File 'lib/mischacks.rb', line 61

def self.sh cmd, *args
  env = if args.last.is_a? Hash then args.pop else {} end

  fork_and_check do
    do_and_exit! do
      begin
        env.each_pair do |k, v| ENV[k.to_s] = v.to_s end
        exec *(%W{sh -e -c #{cmd} sh} + args.map {|a| a.to_s })
      rescue Exception => e
        warn e.to_formatted_string
      end
    end
  end

  nil
end