Created
November 7, 2012 02:34
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capturing stdout and stderr
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def capture(options={}) | |
out = options[:out] | |
err = options[:err] || :out | |
stdout_old = $stdout.dup | |
stderr_old = $stderr.dup | |
$stdout.reopen out | |
err = $stdout if err == :out | |
$stderr.reopen err | |
yield | |
ensure | |
$stdout.flush | |
$stderr.flush | |
$stdout.reopen stdout_old | |
$stderr.reopen stderr_old | |
end | |
if __FILE__ == $0 | |
capture(:out => open('a.txt', 'w')) do | |
STDOUT.puts 'STDOUT.puts' | |
system 'echo "system"' | |
STDERR.puts 'STDERR.puts' | |
end | |
end | |
__END__ | |
$ cat a.txt | |
STDOUT.puts | |
system | |
STDERR.puts |
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