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avdi/gist:6131832

Created August 1, 2013 14:23
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gistfile1.rb
Open3.pipeline_r(
%W[xmllint --xinclude --xmlout #{spine_file}],
# In order to clean up extraneous namespace declarations we need a second
# xmllint process
%W[xmllint --format --nsclean --xmlout -]) do |output, wait_thr|
open(codex_file, 'w') do |f|
IO.copy_stream(output, f)
end
end
@kennethkalmer
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kennethkalmer commented Aug 1, 2013

That is awesome, see http://www.ruby-doc.org/stdlib-2.0/libdoc/open3/rdoc/Open3.html#method-c-pipeline_r for more details.

@rwjblue
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rwjblue commented Aug 1, 2013

So it is basically piping the output from the first command into the input of the second command then passing the output of the last command to the block.

So command_one | command_two > OUTPUT

Right?

@avdi
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avdi commented Aug 1, 2013

Yep. And then IO.copy_stream pipes the output into a file. Yay!

@avdi
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avdi commented Aug 1, 2013

The important thing is that these are real pipes - it's not collecting all the output from the first before it starts executing the second process.

@bf4
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bf4 commented Aug 1, 2013

I use your capture_stream block in metric_fu, but I still am in copypasta land with pipes. https://github.com/metricfu/metric_fu/pull/108/files#L2R37 https://github.com/metricfu/metric_fu/blob/297c64/lib/metric_fu/logging/mf_debugger.rb#L26

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