| commit | bf0a1263d6872aed011ac39b533b7c086c560440 | [log] [tgz] |
|---|---|---|
| author | Kalyan Namburi <nvsnkalyan@gmail.com> | Fri Sep 30 15:55:10 2016 +0200 |
| committer | Kalyan Namburi <nvsnkalyan@gmail.com> | Fri Sep 30 15:55:10 2016 +0200 |
| tree | b5688e8702c76a03731f5a616e21f2a533bae81d | |
| parent | 1c7173745a6001f67d8d96ab4e178284c77f7759 [diff] |
Move golang.org/x/net/context to context Fixes #4
Subcommands is a Go package that implements a simple way for a single command to have many subcommands, each of which takes arguments and so forth.
This is not an official Google product.
Set up a ‘print’ subcommand:
import (
"flag"
"fmt"
"os"
"strings"
"github.com/google/subcommands"
"golang.org/x/net/context"
)
type printCmd struct {
capitalize bool
}
func (*printCmd) Name() string { return "print" }
func (*printCmd) Synopsis() string { return "Print args to stdout." }
func (*printCmd) Usage() string {
return `print [-capitalize] <some text>:
Print args to stdout.
`
}
func (p *printCmd) SetFlags(f *flag.FlagSet) {
f.BoolVar(&p.capitalize, "capitalize", false, "capitalize output")
}
func (p *printCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
for _, arg := range f.Args() {
if p.capitalize {
arg = strings.ToUpper(arg)
}
fmt.Printf("%s ", arg)
}
fmt.Println()
return subcommands.ExitSuccess
}
Register using the default Commander, also use some built in subcommands, finally run Execute using ExitStatus as the exit code:
func main() {
subcommands.Register(subcommands.HelpCommand(), "")
subcommands.Register(subcommands.FlagsCommand(), "")
subcommands.Register(subcommands.CommandsCommand(), "")
subcommands.Register(&printCmd{}, "")
flag.Parse()
ctx := context.Background()
os.Exit(int(subcommands.Execute(ctx)))
}