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lib/generators: add toDhall

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This commit is contained in:
Emery Hemingway 2021-03-24 11:20:36 +01:00
parent 9d0e4e9192
commit 1cd48efa96
1 changed files with 24 additions and 0 deletions
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24
lib/generators.nix
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@ -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;
}