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lib/strings: add a toInt helper (close #11242)

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While the function itself is pretty easy, it's not straitforward to find a way to convert string to int with nix.
This commit is contained in:
Christian Zagrodnick 2015-11-24 10:00:44 +01:00 • committed by Vladimír Čunát
parent 882344e480
commit 1cdacc6aa2
2 changed files with 24 additions and 6 deletions
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8
lib/strings.nix
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@ -223,4 +223,12 @@ rec {
# Check whether a value is a store path.
isStorePath = x: builtins.substring 0 1 (toString x) == "/" && dirOf (builtins.toPath x) == builtins.storeDir;
# Convert string to int
# Obviously, it is a bit hacky to use fromJSON that way.
toInt = str:
let may_be_int = builtins.fromJSON str; in
if builtins.isInt may_be_int
then may_be_int
else throw "Could not convert ${str} to int.";
}