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115 lines
2.6 KiB
115 lines
2.6 KiB
package cli
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import (
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"fmt"
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"io"
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"os"
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"strings"
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)
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// OsExiter is the function used when the app exits. If not set defaults to os.Exit.
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var OsExiter = os.Exit
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// ErrWriter is used to write errors to the user. This can be anything
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// implementing the io.Writer interface and defaults to os.Stderr.
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var ErrWriter io.Writer = os.Stderr
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// MultiError is an error that wraps multiple errors.
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type MultiError struct {
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Errors []error
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}
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// NewMultiError creates a new MultiError. Pass in one or more errors.
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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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// Error implements the error interface.
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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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type ErrorFormatter interface {
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Format(s fmt.State, verb rune)
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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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error
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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 interface{}
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}
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// NewExitError makes a new *ExitError
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func NewExitError(message interface{}, 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 fmt.Sprintf("%v", 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 OsExiter 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 and calls OsExiter with the last exit code.
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func HandleExitCoder(err error) {
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if err == nil {
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return
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}
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if exitErr, ok := err.(ExitCoder); ok {
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if err.Error() != "" {
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if _, ok := exitErr.(ErrorFormatter); ok {
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fmt.Fprintf(ErrWriter, "%+v\n", err)
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} else {
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fmt.Fprintln(ErrWriter, err)
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}
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}
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OsExiter(exitErr.ExitCode())
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return
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}
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if multiErr, ok := err.(MultiError); ok {
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code := handleMultiError(multiErr)
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OsExiter(code)
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return
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}
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}
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func handleMultiError(multiErr MultiError) int {
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code := 1
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for _, merr := range multiErr.Errors {
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if multiErr2, ok := merr.(MultiError); ok {
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code = handleMultiError(multiErr2)
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} else {
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fmt.Fprintln(ErrWriter, merr)
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if exitErr, ok := merr.(ExitCoder); ok {
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code = exitErr.ExitCode()
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}
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}
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}
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return code
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}
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