Feature request: New target: replace active editor

[Strauman]

Motivation

If used to process the entire file, then instead of doing inplace processing, one would have the possibility to execute said file-processor when the file is not saved, as well as be able to process the contents without automatically overwriting the file.

Example usage

I'm using process-palette to do, amongst other things, prettifying of code. E.g. via autopep8 (prettifier for python).
Say I have a pretty big python file and run the implemented autopep8, then I might want to see what it does to my file before it does it. Then this feature would now take the text in the editor as input and return a replacement of all the text in the input, without the file getting saved.

Implementation thoughts

I imagine that it should be quite straight forward to just add a "Delete all contents"-instruction before doing the regular "Write to active editor" target?

[morassman]

This should be quite straight forward. I'll add this to the next version. I just can't promise a release date though.

[datavectors]

I have found that outboard processes (such as running file content in a different editor session) can be launched from Atom through process-palette command (I call it Run Proxy). Simply pass {Atom-variables} as args using Python module argsparse. I keep my external (proxy) scripts in ~/.atom-scripts/ and the process-palette custom command runs the external script.