76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
package cli
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import (
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"fmt"
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"os"
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"strings"
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)
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type MultiError struct {
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Errors []error
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}
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func NewMultiError(err ...error) MultiError {
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return MultiError{Errors: err}
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}
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func (m MultiError) Error() string {
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errs := make([]string, len(m.Errors))
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for i, err := range m.Errors {
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errs[i] = err.Error()
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}
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return strings.Join(errs, "\n")
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}
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// ExitCoder is the interface checked by `App` and `Command` for a custom exit
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// code
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type ExitCoder interface {
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ExitCode() int
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}
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// ExitError fulfills both the builtin `error` interface and `ExitCoder`
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type ExitError struct {
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exitCode int
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message string
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}
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// NewExitError makes a new *ExitError
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func NewExitError(message string, exitCode int) *ExitError {
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return &ExitError{
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exitCode: exitCode,
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message: message,
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}
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}
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// Error returns the string message, fulfilling the interface required by
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// `error`
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func (ee *ExitError) Error() string {
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return ee.message
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}
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// ExitCode returns the exit code, fulfilling the interface required by
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// `ExitCoder`
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func (ee *ExitError) ExitCode() int {
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return ee.exitCode
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}
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// HandleExitCoder checks if the error fulfills the ExitCoder interface, and if
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// so prints the error to stderr (if it is non-empty) and calls os.Exit with the
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// given exit code. If the given error is a MultiError, then this func is
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// called on all members of the Errors slice.
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func HandleExitCoder(err error) {
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if exitErr, ok := err.(ExitCoder); ok {
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if err.Error() != "" {
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fmt.Fprintln(os.Stderr, err)
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}
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os.Exit(exitErr.ExitCode())
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}
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if multiErr, ok := err.(MultiError); ok {
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for _, merr := range multiErr.Errors {
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HandleExitCoder(merr)
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}
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}
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}
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