mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-23 22:20:51 +00:00
39 lines
993 B
Nix
39 lines
993 B
Nix
|
/* `dhallToNix` is a utility function to convert expressions in the Dhall
|
||
|
|
configuration language to their corresponding Nix expressions.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
dhallToNix "{ foo = 1, bar = True }"
|
||
|
|
=> { foo = 1; bar = true; }
|
||
|
|
dhallToNix "λ(x : Bool) → x == False"
|
||
|
|
=> x : x == false
|
||
|
|
dhallToNix "λ(x : Bool) → x == False" false
|
||
|
|
=> true
|
||
|
|
|
||
|
|
See https://hackage.haskell.org/package/dhall-nix/docs/Dhall-Nix.html for
|
||
|
|
a longer tutorial
|
||
|
|
|
||
|
|
Note that this uses "import from derivation", meaning that Nix will perform
|
||
|
|
a build during the evaluation phase if you use this `dhallToNix` utility
|
||
|
|
*/
|
||
|
|
{ stdenv, dhall-nix }:
|
||
|
|
|
||
|
|
let
|
||
|
|
dhallToNix = code :
|
||
|
|
let
|
||
|
|
file = builtins.toFile "dhall-expression" code;
|
||
|
|
|
||
|
|
drv = stdenv.mkDerivation {
|
||
|
|
name = "dhall-compiled.nix";
|
||
|
|
|
||
|
|
buildCommand = ''
|
||
|
|
dhall-to-nix <<< "${file}" > $out
|
||
|
|
'';
|
||
|
|
|
||
|
|
buildInputs = [ dhall-nix ];
|
||
|
|
};
|
||
|
|
|
||
|
|
in
|
||
|
|
import "${drv}";
|
||
|
|
in
|
||
|
|
dhallToNix
|