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// Copyright 2021 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// releaser is a tool for maintaining rules_go and Gazelle. It automates
// multiple tasks related to preparing releases, like upgrading dependencies,
// and uploading release artifacts.
package main
import (
"context"
"errors"
"fmt"
"io"
"os"
"os/signal"
)
func main() {
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
defer cancel()
if err := run(ctx, os.Stderr, os.Args[1:]); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
type command struct {
name, description, help string
run func(context.Context, io.Writer, []string) error
}
var commands = []*command{
&helpCmd,
&prepareCmd,
&upgradeDepCmd,
}
func run(ctx context.Context, stderr io.Writer, args []string) error {
if len(args) == 0 {
return errors.New("no command specified. For a list of commands, run:\n\treleaser help")
}
name, args := args[0], args[1:]
for _, arg := range args {
if arg == "-h" || name == "-help" || name == "--help" {
return helpCmd.run(ctx, stderr, args)
}
}
for _, cmd := range commands {
if cmd.name == name {
return cmd.run(ctx, stderr, args)
}
}
return fmt.Errorf("unknown command %q. For a list of commands, run:\n\treleaser help", name)
}
var helpCmd = command{
name: "help",
description: "prints information on how to use any subcommand",
help: `releaser help [subcommand]
The help sub-command prints information on how to use any subcommand. Run help
without arguments for a list of all subcommands.
`,
}
func init() {
// break init cycle
helpCmd.run = runHelp
}
func runHelp(ctx context.Context, stderr io.Writer, args []string) error {
if len(args) > 1 {
return usageErrorf(&helpCmd, "help accepts at most one argument.")
}
if len(args) == 1 {
name := args[0]
for _, cmd := range commands {
if cmd.name == name {
fmt.Fprintf(stderr, "%s\n\n%s\n", cmd.description, cmd.help)
return nil
}
}
return fmt.Errorf("Unknown command %s. For a list of supported subcommands, run:\n\treleaser help", name)
}
fmt.Fprint(stderr, "releaser supports the following subcommands:\n\n")
maxNameLen := 0
for _, cmd := range commands {
if len(cmd.name) > maxNameLen {
maxNameLen = len(cmd.name)
}
}
for _, cmd := range commands {
fmt.Fprintf(stderr, "\t%-*s %s\n", maxNameLen, cmd.name, cmd.description)
}
fmt.Fprintf(stderr, "\nRun 'releaser help <subcommand>' for more information on any command.\n")
return nil
}
type usageError struct {
cmd *command
err error
}
func (e *usageError) Error() string {
return fmt.Sprintf("%v. For usage info, run:\n\treleaser help %s", e.err, e.cmd.name)
}
func (e *usageError) Unwrap() error {
return e.err
}
func usageErrorf(cmd *command, format string, args ...interface{}) error {
return &usageError{cmd: cmd, err: fmt.Errorf(format, args...)}
}
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