| // Copyright 2019 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 main |
| |
| import ( |
| "flag" |
| "fmt" |
| "os/exec" |
| "strings" |
| |
| "golang.org/x/mod/module" |
| "golang.org/x/xerrors" |
| ) |
| |
| type usageError struct { |
| err error |
| } |
| |
| func usageErrorf(format string, args ...interface{}) error { |
| return &usageError{err: fmt.Errorf(format, args...)} |
| } |
| |
| const usageText = `usage: gorelease -base=version [-version=version]` |
| |
| func (e *usageError) Error() string { |
| msg := "" |
| if !xerrors.Is(e.err, flag.ErrHelp) { |
| msg = e.err.Error() |
| } |
| return usageText + "\n" + msg + "\nFor more information, run go doc golang.org/x/exp/cmd/gorelease" |
| } |
| |
| type downloadError struct { |
| m module.Version |
| err error |
| } |
| |
| func (e *downloadError) Error() string { |
| var msg string |
| if xerr, ok := e.err.(*exec.ExitError); ok { |
| msg = strings.TrimSpace(string(xerr.Stderr)) |
| } else { |
| msg = e.err.Error() |
| } |
| sep := " " |
| if strings.Contains(msg, "\n") { |
| sep = "\n" |
| } |
| return fmt.Sprintf("error downloading module %s@%s:%s%s", e.m.Path, e.m.Version, sep, msg) |
| } |