Preprocessor for a selected text sending to REPL

[aqjune]

Hi,

When I want to run a selected text in REPL, sometimes I cannot use "Evaluate Selection" because the text must be properly preprocessed somehow.
For example, in an application called HOL Light, I often want to evaluate some selected expression expr in a function called e so that the actual sentence I want to run in REPL is e(expr);;.

Would it be a good idea if there is a new command, say "Evaluate Selection Using Custom Preprocessor", that runs a user-specified Javascript file on the input and runs its output (which is the preprocessed text) in REPL?

[aqjune]

Let me write a patch for this in my spare time.