Stack has
stack build --file-watch
which automatically recompiles a Haskell project whenever files change. Does nix have something analogous with nix-build, or is there a well-known tool which can help achieve these?
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George
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Not a feature of `nix-build`, but perhaps a different tool could be used to call `nix-build`, such as these suggestions: "FAQ: I want to run arbitrary commands when arbitrary files change..." https://github.com/ndmitchell/ghcid#i-want-to-run-arbitrary-commands-when-arbitrary-files-change – Peter Becich Nov 19 '22 at 08:14
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For Haskell and Nix this https://stackoverflow.com/q/67312833/1007926 may be relevant – Peter Becich Nov 19 '22 at 08:15
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Nix does not provide this functionality by itself. Lorri comes close, but its focus is on providing an instant "nix-shell" via direnv. It is not currently suitable for building and testing your project like stack build --file-watch does. If you're interested, you could create an issue to discuss such a feature with the authors.
Robert Hensing
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