modules/lib/strings.nix


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{ lib }:

with lib;

{
  # Figures out a valid Nix store name for the given path.
  storeFileName = path:
    let
      # All characters that are considered safe. Note "-" is not
      # included to avoid "-" followed by digit being interpreted as a
      # version.
      safeChars =
        [ "+" "." "_" "?" "=" ]
        ++ lowerChars
        ++ upperChars
        ++ stringToCharacters "0123456789";

      empties = l: genList (x: "") (length l);

      unsafeInName = stringToCharacters (
        replaceStrings safeChars (empties safeChars) path
      );

      safeName = replaceStrings unsafeInName (empties unsafeInName) path;
    in
      "hm_" + safeName;
}