// ExecuteHelpTemplate() prints the command line help using the given template and exits.
func executeHelpTemplate(errMsg string) {
buff := bytes.Buffer{}
flag.VisitAll(func(f *flag.Flag) {
buff.WriteString(fmt.Sprintf("\t-%-8s%s\n", f.Name, f.Usage))
})
data := struct {
BuildInfo string
Flags string
Error string
}{
core.BuildInfo(),
buff.String(),
errMsg,
}
t, _ := template.New("help").Parse(helpTemplate)
t.Execute(os.Stdout, data)
os.Exit(1)
}
func main() {
opts := config()
if opts.PrintHelp {
executeHelpTemplate("")
} else if opts.PrintVersion {
fmt.Println(core.BuildInfo())
os.Exit(0)
}
switch opts.Mode {
case "cli":
if anyEmptyString(opts.InFile, opts.OutFile, opts.ThumbType) {
executeHelpTemplate("Missing InFile, OutFile, or ThumbType.")
}
if !inArrayString(opts.ThumbType, core.ValidThumbTypes) {
executeHelpTemplate("Invalid thumbnail type.")
}
cli.Go()
case "http":
http.Go()
default:
executeHelpTemplate("Invalid mode.")
}
}