1 files changed, 115 insertions, 0 deletions
diff --git a/vendor/github.com/urfave/cli/errors.go b/vendor/github.com/urfave/cli/errors.go
new file mode 100644
index 000000000..562b2953c
--- /dev/null
+++ b/vendor/github.com/urfave/cli/errors.go
@@ -0,0 +1,115 @@
+package cli
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+// OsExiter is the function used when the app exits. If not set defaults to os.Exit.
+var OsExiter = os.Exit
+
+// ErrWriter is used to write errors to the user. This can be anything
+// implementing the io.Writer interface and defaults to os.Stderr.
+var ErrWriter io.Writer = os.Stderr
+
+// MultiError is an error that wraps multiple errors.
+type MultiError struct {
+	Errors []error
+}
+
+// NewMultiError creates a new MultiError. Pass in one or more errors.
+func NewMultiError(err ...error) MultiError {
+	return MultiError{Errors: err}
+}
+
+// Error implements the error interface.
+func (m MultiError) Error() string {
+	errs := make([]string, len(m.Errors))
+	for i, err := range m.Errors {
+		errs[i] = err.Error()
+	}
+
+	return strings.Join(errs, "\n")
+}
+
+type ErrorFormatter interface {
+	Format(s fmt.State, verb rune)
+}
+
+// ExitCoder is the interface checked by `App` and `Command` for a custom exit
+// code
+type ExitCoder interface {
+	error
+	ExitCode() int
+}
+
+// ExitError fulfills both the builtin `error` interface and `ExitCoder`
+type ExitError struct {
+	exitCode int
+	message  interface{}
+}
+
+// NewExitError makes a new *ExitError
+func NewExitError(message interface{}, exitCode int) *ExitError {
+	return &ExitError{
+		exitCode: exitCode,
+		message:  message,
+	}
+}
+
+// Error returns the string message, fulfilling the interface required by
+// `error`
+func (ee *ExitError) Error() string {
+	return fmt.Sprintf("%v", ee.message)
+}
+
+// ExitCode returns the exit code, fulfilling the interface required by
+// `ExitCoder`
+func (ee *ExitError) ExitCode() int {
+	return ee.exitCode
+}
+
+// HandleExitCoder checks if the error fulfills the ExitCoder interface, and if
+// so prints the error to stderr (if it is non-empty) and calls OsExiter with the
+// given exit code.  If the given error is a MultiError, then this func is
+// called on all members of the Errors slice and calls OsExiter with the last exit code.
+func HandleExitCoder(err error) {
+	if err == nil {
+		return
+	}
+
+	if exitErr, ok := err.(ExitCoder); ok {
+		if err.Error() != "" {
+			if _, ok := exitErr.(ErrorFormatter); ok {
+				fmt.Fprintf(ErrWriter, "%+v\n", err)
+			} else {
+				fmt.Fprintln(ErrWriter, err)
+			}
+		}
+		OsExiter(exitErr.ExitCode())
+		return
+	}
+
+	if multiErr, ok := err.(MultiError); ok {
+		code := handleMultiError(multiErr)
+		OsExiter(code)
+		return
+	}
+}
+
+func handleMultiError(multiErr MultiError) int {
+	code := 1
+	for _, merr := range multiErr.Errors {
+		if multiErr2, ok := merr.(MultiError); ok {
+			code = handleMultiError(multiErr2)
+		} else {
+			fmt.Fprintln(ErrWriter, merr)
+			if exitErr, ok := merr.(ExitCoder); ok {
+				code = exitErr.ExitCode()
+			}
+		}
+	}
+	return code
+}