Modify parsing functions and config structs to accept hcl changes

Signed-off-by: Patrick Van Stee <patrick@vanstee.me>

vendor/github.com/zclconf/go-cty/cty/function/stdlib/general.go

@@ -0,0 +1,107 @@
+package stdlib
+
+import (
+	"fmt"
+
+	"github.com/zclconf/go-cty/cty"
+	"github.com/zclconf/go-cty/cty/convert"
+	"github.com/zclconf/go-cty/cty/function"
+)
+
+var EqualFunc = function.New(&function.Spec{
+	Params: []function.Parameter{
+		{
+			Name:             "a",
+			Type:             cty.DynamicPseudoType,
+			AllowUnknown:     true,
+			AllowDynamicType: true,
+			AllowNull:        true,
+		},
+		{
+			Name:             "b",
+			Type:             cty.DynamicPseudoType,
+			AllowUnknown:     true,
+			AllowDynamicType: true,
+			AllowNull:        true,
+		},
+	},
+	Type: function.StaticReturnType(cty.Bool),
+	Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
+		return args[0].Equals(args[1]), nil
+	},
+})
+
+var NotEqualFunc = function.New(&function.Spec{
+	Params: []function.Parameter{
+		{
+			Name:             "a",
+			Type:             cty.DynamicPseudoType,
+			AllowUnknown:     true,
+			AllowDynamicType: true,
+			AllowNull:        true,
+		},
+		{
+			Name:             "b",
+			Type:             cty.DynamicPseudoType,
+			AllowUnknown:     true,
+			AllowDynamicType: true,
+			AllowNull:        true,
+		},
+	},
+	Type: function.StaticReturnType(cty.Bool),
+	Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
+		return args[0].Equals(args[1]).Not(), nil
+	},
+})
+
+var CoalesceFunc = function.New(&function.Spec{
+	Params: []function.Parameter{},
+	VarParam: &function.Parameter{
+		Name:             "vals",
+		Type:             cty.DynamicPseudoType,
+		AllowUnknown:     true,
+		AllowDynamicType: true,
+		AllowNull:        true,
+	},
+	Type: func(args []cty.Value) (ret cty.Type, err error) {
+		argTypes := make([]cty.Type, len(args))
+		for i, val := range args {
+			argTypes[i] = val.Type()
+		}
+		retType, _ := convert.UnifyUnsafe(argTypes)
+		if retType == cty.NilType {
+			return cty.NilType, fmt.Errorf("all arguments must have the same type")
+		}
+		return retType, nil
+	},
+	Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
+		for _, argVal := range args {
+			if !argVal.IsKnown() {
+				return cty.UnknownVal(retType), nil
+			}
+			if argVal.IsNull() {
+				continue
+			}
+
+			return convert.Convert(argVal, retType)
+		}
+		return cty.NilVal, fmt.Errorf("no non-null arguments")
+	},
+})
+
+// Equal determines whether the two given values are equal, returning a
+// bool value.
+func Equal(a cty.Value, b cty.Value) (cty.Value, error) {
+	return EqualFunc.Call([]cty.Value{a, b})
+}
+
+// NotEqual is the opposite of Equal.
+func NotEqual(a cty.Value, b cty.Value) (cty.Value, error) {
+	return NotEqualFunc.Call([]cty.Value{a, b})
+}
+
+// Coalesce returns the first of the given arguments that is not null. If
+// all arguments are null, an error is produced.
+func Coalesce(vals ...cty.Value) (cty.Value, error) {
+	return CoalesceFunc.Call(vals)
+}