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{lib, ...}: let
fmt = val:
# nil
if val == null
then "nil"
# boolean
else if builtins.isBool val
then
if val
then "true"
else "false"
# number
else if builtins.isInt val || builtins.isFloat val
then toString val
# string
else if builtins.isString val
then "'${val}'"
# table (array)
else if builtins.isList val
then "{ " + (lib.concatStringsSep ", " (map fmt val)) + " }"
# table (object)
else if builtins.isAttrs val
then
"{ "
+ (lib.concatStringsSep ", "
(lib.mapAttrsToList (k: v: "${k} = ${fmt v}") val))
+ " }"
# invalid
else throw "Unsupported value: ${toString val}";
in {
fmt = fmt;
}
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