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> In more concise languages that whole piece would look like a single line:

---

  env.lines = [line for line in env.lines if not line.startswith("+++")]
---

I don't think that's what its actually doing. I think its actually return all the lines after the first line that starts with "+++". Or maybe all those lines but the first.

(I don't think its a good example of clear FP code, either.)



Yeah, in Haskell I'd probably have done something like

    dropWhile (not . T.isPrefixOf "+++") >>> \case
        [] -> return ()
        (line:lines) -> do
            header env line
            modified env 0 lines
edited to add: code above assumes LambdaCase and OverloadedStrings extensions, and that you've imported Data.Text qualified as T


lambdacase is one of my favorite extensions :D


I really like ScopedTypeVariables


To this Haskeller it appears to be keeping state as well.


Certainly some information is moving behind the scenes, given the "header ... ; modified ..."




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