/
godzil.go
54 lines (48 loc) · 1.14 KB
/
godzil.go
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package godzil
import (
"context"
"errors"
"flag"
"fmt"
"io"
"log"
)
// Run the godzil
func Run(ctx context.Context, argv []string, outStream, errStream io.Writer) error {
log.SetOutput(errStream)
log.SetPrefix("[godzil] ")
fs := flag.NewFlagSet(
fmt.Sprintf("godzil (v%s rev:%s)", version, revision), flag.ContinueOnError)
fs.SetOutput(errStream)
ver := fs.Bool("version", false, "display version")
if err := fs.Parse(argv); err != nil {
return err
}
if *ver {
return printVersion(outStream)
}
argv = fs.Args()
if len(argv) < 1 {
return errors.New("no subcommand specified")
}
rnr, ok := dispatch[argv[0]]
if !ok {
return fmt.Errorf("unknown subcommand: %s", argv[0])
}
return rnr.run(argv[1:], outStream, errStream)
}
func printVersion(out io.Writer) error {
_, err := fmt.Fprintf(out, "godzil v%s (rev:%s)\n", version, revision)
return err
}
var dispatch = map[string]runner{
"release": &release{},
"new": &new{},
"show-version": &showVersion{},
"changelog": &changelog{},
"crossbuild": &crossbuild{},
"credits": &credits{},
}
type runner interface {
run([]string, io.Writer, io.Writer) error
}