lang: funcs: Move standalone functions into core

Everything should be all together.

lang/core/panic.go

@@ -0,0 +1,93 @@
+// Mgmt
+// Copyright (C) 2013-2024+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Additional permission under GNU GPL version 3 section 7
+//
+// If you modify this program, or any covered work, by linking or combining it
+// with embedded mcl code and modules (and that the embedded mcl code and
+// modules which link with this program, contain a copy of their source code in
+// the authoritative form) containing parts covered by the terms of any other
+// license, the licensors of this program grant you additional permission to
+// convey the resulting work. Furthermore, the licensors of this program grant
+// the original author, James Shubin, additional permission to update this
+// additional permission if he deems it necessary to achieve the goals of this
+// additional permission.
+
+package core
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/purpleidea/mgmt/lang/funcs/simple"
+	"github.com/purpleidea/mgmt/lang/types"
+)
+
+func init() {
+	simple.Register("panic", &simple.Scaffold{
+		T: types.NewType("func(x ?1) bool"), // ?1 is bool or str
+		C: simple.TypeMatch([]string{
+			"func(x bool) bool",
+			"func(x str) bool",
+		}),
+		//C: func(typ *types.Type) error {
+		//	if typ == nil {
+		//		return fmt.Errorf("nil type")
+		//	}
+		//	if typ.Kind != types.KindFunc {
+		//		return fmt.Errorf("not a func")
+		//	}
+		//	if len(typ.Map) != 1 || len(typ.Ord) != 1 {
+		//		return fmt.Errorf("arg count wrong")
+		//	}
+		//	if err := typ.Out.Cmp(types.TypeBool); err != nil {
+		//		return err
+		//	}
+		//	t := typ.Map[typ.Ord[0]]
+		//	if t.Cmp(types.TypeBool) == nil {
+		//		return nil // func(bool) int
+		//	}
+		//	if t.Cmp(types.TypeStr) == nil {
+		//		return nil // func(str) int
+		//	}
+		//	return fmt.Errorf("can't check type of: %s", t)
+		//},
+		F: Panic,
+	})
+}
+
+// Panic returns an error when it receives a non-empty string or a true boolean.
+// The error should cause the function engine to shutdown. If there's no error,
+// it returns false.
+func Panic(ctx context.Context, input []types.Value) (types.Value, error) {
+	switch k := input[0].Type().Kind; k {
+	case types.KindBool:
+		if input[0].Bool() {
+			return nil, fmt.Errorf("bool panic occurred")
+		}
+	case types.KindStr:
+		if s := input[0].Str(); s != "" {
+			return nil, fmt.Errorf("str panic occurred: %s", s)
+		}
+	default:
+		return nil, fmt.Errorf("unsupported kind: %+v", k)
+	}
+
+	return &types.BoolValue{
+		V: false,
+	}, nil
+}