home-manager/modules/lib/strings.nix

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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;
}