mirror of https://github.com/golang/go.git
41 lines
1008 B
Go
41 lines
1008 B
Go
// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cmd
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import (
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"context"
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"flag"
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"fmt"
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"golang.org/x/tools/internal/tool"
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)
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// subcommands is a helper that may be embedded for commands that delegate to
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// subcommands.
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type subcommands []tool.Application
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func (s subcommands) DetailedHelp(f *flag.FlagSet) {
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fmt.Fprint(f.Output(), "\nsubcommands:\n")
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for _, c := range s {
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fmt.Fprintf(f.Output(), " %s: %s\n", c.Name(), c.ShortHelp())
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}
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f.PrintDefaults()
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}
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func (s subcommands) Usage() string { return "<subcommand> [args...]" }
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func (s subcommands) Run(ctx context.Context, args ...string) error {
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if len(args) == 0 {
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return tool.CommandLineErrorf("must provide subcommand")
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}
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command, args := args[0], args[1:]
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for _, c := range s {
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if c.Name() == command {
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return tool.Run(ctx, c, args)
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}
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}
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return tool.CommandLineErrorf("unknown subcommand %v", command)
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}
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