I understand that a process that I spawn with require('child_process').spawn()
*has* three streams: stdin, stdout, stderr.
http://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options
But I've now read about require('stream').Transform and it feels like for
certain types of programs (compression programs like bzip2 or image conversion
programs like ImageMagick) I would want the spawned process to *be* a stream --
a transform stream.
http://nodejs.org/api/stream.html#stream_class_stream_transform
I've tried to find examples of how to wrap a spawned child process in a
transform stream, and I haven't found any, which makes me think I'm going about
this the wrong way.
I want to be able to do something like this:
var rs; // a readable stream, maybe a file
var ws; // a writable stream, maybe an http response
var convert; // a transform stream that uses ImageMagick's convert program
rs.pipe(convert).pipe(ws);
Am I wrong to want this?
If not, how to I do this?
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