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You could implement the 2 transformations using any language you like, and then hook into your editor of choice's on-load/on-save API, to pipe the text through the external programs.

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Aha! I had not thought to look for such a hook. Are they common? This is very close to what I'm looking for, thank you. Then, to toggle, I guess I would automate closing and reopening the file.

Edit: Oops. Now I'm thinking this would probably break all code analysis features. It would be nice if there was a notion of a 'view' that is very superficial and doesn't impact the code analysis.

All programmer editors should at least have some mechanism to notify you when loads/saves occur. But you might need to use whatever the editor's embedded scripting language is to do the actual child process launching and to do something non-standard with their output.

In Sublime Text for example, the above would be writing a Python class that handles some of these events:

https://www.sublimetext.com/docs/3/api_reference.html#sublim...

...probably by making use of the subprocess module from Python's standard library:

https://docs.python.org/3.3/library/subprocess.html

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