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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package script
import (
"errors"
"fmt"
)
// ErrUnexpectedSuccess indicates that a script command that was expected to
// fail (as indicated by a "!" prefix) instead completed successfully.
var ErrUnexpectedSuccess = errors.New("unexpected success")
// A CommandError describes an error resulting from attempting to execute a
// specific command.
type CommandError struct {
File string
Line int
Op string
Args []string
Err error
}
func cmdError(cmd *command, err error) *CommandError {
return &CommandError{
File: cmd.file,
Line: cmd.line,
Op: cmd.name,
Args: cmd.args,
Err: err,
}
}
func (e *CommandError) Error() string {
if len(e.Args) == 0 {
return fmt.Sprintf("%s:%d: %s: %v", e.File, e.Line, e.Op, e.Err)
}
return fmt.Sprintf("%s:%d: %s %s: %v", e.File, e.Line, e.Op, quoteArgs(e.Args), e.Err)
}
func (e *CommandError) Unwrap() error { return e.Err }
// A UsageError reports the valid arguments for a command.
//
// It may be returned in response to invalid arguments.
type UsageError struct {
Name string
Command Cmd
}
func (e *UsageError) Error() string {
usage := e.Command.Usage()
suffix := ""
if usage.Async {
suffix = " [&]"
}
return fmt.Sprintf("usage: %s %s%s", e.Name, usage.Args, suffix)
}
// ErrUsage may be returned by a Command to indicate that it was called with
// invalid arguments; its Usage method may be called to obtain details.
var ErrUsage = errors.New("invalid usage")