Update to tengo v2 (#976)

vendor/github.com/d5/tengo/v2/stdlib/os_file.go

@@ -0,0 +1,117 @@
+package stdlib
+
+import (
+	"os"
+
+	"github.com/d5/tengo/v2"
+)
+
+func makeOSFile(file *os.File) *tengo.ImmutableMap {
+	return &tengo.ImmutableMap{
+		Value: map[string]tengo.Object{
+			// chdir() => true/error
+			"chdir": &tengo.UserFunction{
+				Name:  "chdir",
+				Value: FuncARE(file.Chdir),
+			}, //
+			// chown(uid int, gid int) => true/error
+			"chown": &tengo.UserFunction{
+				Name:  "chown",
+				Value: FuncAIIRE(file.Chown),
+			}, //
+			// close() => error
+			"close": &tengo.UserFunction{
+				Name:  "close",
+				Value: FuncARE(file.Close),
+			}, //
+			// name() => string
+			"name": &tengo.UserFunction{
+				Name:  "name",
+				Value: FuncARS(file.Name),
+			}, //
+			// readdirnames(n int) => array(string)/error
+			"readdirnames": &tengo.UserFunction{
+				Name:  "readdirnames",
+				Value: FuncAIRSsE(file.Readdirnames),
+			}, //
+			// sync() => error
+			"sync": &tengo.UserFunction{
+				Name:  "sync",
+				Value: FuncARE(file.Sync),
+			}, //
+			// write(bytes) => int/error
+			"write": &tengo.UserFunction{
+				Name:  "write",
+				Value: FuncAYRIE(file.Write),
+			}, //
+			// write(string) => int/error
+			"write_string": &tengo.UserFunction{
+				Name:  "write_string",
+				Value: FuncASRIE(file.WriteString),
+			}, //
+			// read(bytes) => int/error
+			"read": &tengo.UserFunction{
+				Name:  "read",
+				Value: FuncAYRIE(file.Read),
+			}, //
+			// chmod(mode int) => error
+			"chmod": &tengo.UserFunction{
+				Name: "chmod",
+				Value: func(args ...tengo.Object) (tengo.Object, error) {
+					if len(args) != 1 {
+						return nil, tengo.ErrWrongNumArguments
+					}
+					i1, ok := tengo.ToInt64(args[0])
+					if !ok {
+						return nil, tengo.ErrInvalidArgumentType{
+							Name:     "first",
+							Expected: "int(compatible)",
+							Found:    args[0].TypeName(),
+						}
+					}
+					return wrapError(file.Chmod(os.FileMode(i1))), nil
+				},
+			},
+			// seek(offset int, whence int) => int/error
+			"seek": &tengo.UserFunction{
+				Name: "seek",
+				Value: func(args ...tengo.Object) (tengo.Object, error) {
+					if len(args) != 2 {
+						return nil, tengo.ErrWrongNumArguments
+					}
+					i1, ok := tengo.ToInt64(args[0])
+					if !ok {
+						return nil, tengo.ErrInvalidArgumentType{
+							Name:     "first",
+							Expected: "int(compatible)",
+							Found:    args[0].TypeName(),
+						}
+					}
+					i2, ok := tengo.ToInt(args[1])
+					if !ok {
+						return nil, tengo.ErrInvalidArgumentType{
+							Name:     "second",
+							Expected: "int(compatible)",
+							Found:    args[1].TypeName(),
+						}
+					}
+					res, err := file.Seek(i1, i2)
+					if err != nil {
+						return wrapError(err), nil
+					}
+					return &tengo.Int{Value: res}, nil
+				},
+			},
+			// stat() => imap(fileinfo)/error
+			"stat": &tengo.UserFunction{
+				Name: "stat",
+				Value: func(args ...tengo.Object) (tengo.Object, error) {
+					if len(args) != 0 {
+						return nil, tengo.ErrWrongNumArguments
+					}
+					return osStat(&tengo.String{Value: file.Name()})
+				},
+			},
+		},
+	}
+}