hclcontext

var EnvFunc = function.New(&function.Spec{
	Params: []function.Parameter{
		{
			Name:             "str",
			Type:             cty.String,
			AllowDynamicType: true,
		},
	},
	Type: function.StaticReturnType(cty.String),
	Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
		in := args[0].AsString()
		out := os.Getenv(in)
		return cty.StringVal(out), nil
	},
})