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author | Alyssa Ross <hi@alyssa.is> | 2021-04-09 18:28:16 +0000 |
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committer | Alyssa Ross <hi@alyssa.is> | 2021-04-12 18:46:15 +0000 |
commit | fd2e737e0678ee7d8081baef05b305146a2c0034 (patch) | |
tree | ac3e9b27576a0382335532d126f9a66d486bc638 /nixpkgs/lib/generators.nix | |
parent | cc207d720b6aa836e256c1ee9842bc739e630a8a (diff) | |
parent | 9e377a6ce42dccd9b624ae4ce8f978dc892ba0e2 (diff) | |
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Merge remote-tracking branch 'nixpkgs/nixos-unstable'
Diffstat (limited to 'nixpkgs/lib/generators.nix')
-rw-r--r-- | nixpkgs/lib/generators.nix | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/nixpkgs/lib/generators.nix b/nixpkgs/lib/generators.nix index 501a23599f45..c8144db50ac8 100644 --- a/nixpkgs/lib/generators.nix +++ b/nixpkgs/lib/generators.nix @@ -307,4 +307,28 @@ rec { ${expr "" v} </plist>''; + /* Translate a simple Nix expression to Dhall notation. + * Note that integers are translated to Integer and never + * the Natural type. + */ + toDhall = { }@args: v: + with builtins; + let concatItems = lib.strings.concatStringsSep ", "; + in if isAttrs v then + "{ ${ + concatItems (lib.attrsets.mapAttrsToList + (key: value: "${key} = ${toDhall args value}") v) + } }" + else if isList v then + "[ ${concatItems (map (toDhall args) v)} ]" + else if isInt v then + "${if v < 0 then "" else "+"}${toString v}" + else if isBool v then + (if v then "True" else "False") + else if isFunction v then + abort "generators.toDhall: cannot convert a function to Dhall" + else if isNull v then + abort "generators.toDhall: cannot convert a null to Dhall" + else + builtins.toJSON v; } |