func main() {
var conf Config
//parser := args.Parser(args.WarnUnknownArgs(), args.UsageName("my-program"))
parser := args.Parser()
// Positional Argument, there can be more than one argument and the result will be an array
parser.Pos("count", args.Append(), args.IsInt(), args.Help("Count the numbers provided"))
// Optional Positional Argument, the order the positional arguments are
// defined is the order they are expected on the command line
parser.Pos("infile", args.Optional(), args.IsString(), args.Help("Output file, If none supplied reads from stdin"))
parser.Pos("outfile", args.Optional(), args.IsString(), args.Help("Input file, If none supplied writes to stdout"))
// Counts the number of instances a flag is seen and stores the count as an integer
parser.Opt("--verbose", args.Alias("-v"), args.Count(),
args.Help("Prints Stuff and things"))
// String with default option and Environment option (VarName defines the help message value name)
parser.Opt("--bind", args.Alias("-b"), args.IsString(), args.VarName("ADDRESS"), args.Default("localhost:8080"),
args.Env("BIND_ADDRESS"), args.Store(&conf.Bind), args.Help("The network interface to bind too"))
// Unusual option indicators
parser.Opt("++unusual", args.Alias("+u"), args.IsBool(), args.Default(false),
args.Help("Unusual option indicator"))
parser.Opt("-short", args.Alias("-s"), args.IsBool(), args.Default(false),
args.Help("Short option indicator"))
// Booleans
parser.Opt("--debug", args.Alias("-d"), args.IsBool(), args.Default(false),
args.Help("Turns on debug messages"))
// Append stores an array, and appends each argument value to the array. This allows an option to be specified multiple times.
parser.Opt("--endpoint", args.Alias("-e"), args.Append(), args.IsString(),
args.Default([]string{"http://google.com"}), args.Help("The endpoints to proxy for"))
// Take an option and split the arguments IE: --terms one,two,three
parser.Opt("--terms", args.Alias("-t"), args.Array(), args.IsString(),
args.Default([]string{"foo", "bar"}), args.Help("The terms used to search google with"))
// Give the user choices
parser.Opt("--choice", args.Alias("-c"), args.Choice(), args.IsInt(),
args.Default([]int{1, 2, 3}), args.Help("You can only choose 1,2 or 3"))
// Give the option is required (Required options can not have defaults)
parser.Opt("--required", args.Alias("-r"), args.Required(), args.IsString(),
args.Help("This option is required"))
// Display Help
parser.Opt("--help", args.Alias("-h"), args.IsBool(), args.Help("Display this help message"))
//opts, err := parser.ParseArgs([]string{"-p", "-vvv"})
opts, err := parser.Parse()
if err != nil {
fmt.Println("-- %s", err.Error())
opts.PrintUsage()
os.Exit(-1)
}
// If user asked for --help or there were no options passed
if opts.NoArgs() && opts.Bool("help") {
opts.PrintHelp()
os.Exit(-1)
}
fmt.Printf("Bind Address from opts: %s", opts.String("bind"))
fmt.Printf("Bind Address from Config struct: %s", conf.Bind)
fmt.Printf("Verbose Count: %d", opts.Int("verbose"))
fmt.Printf("Debug Boolean: %b", opts.Bool("debug"))
for _, endpoint := range opts.Array("endpoint").([]string) {
fmt.Println("Endpoint: %s", endpoint)
}
// Parent that provides shared options
parent := args.Parser()
parent.Opt("verbose", args.Alias("-v"), args.Count(), args.Help("Be verbose"))
// Sub Parser, Any arguments past the positional arg 'sub1' will be considered by this sub
sub := parser.SubParser("volume")
// parser and will inherit all the opts from the parent parser
list := sub.SubParser("list", args.Inherit(parent))
list.Opt("filter", args.Alias("-f"), args.IsBool(), args.Help("Filter the list by this thingy"))
}
Expect(opt.Int("verbose")).To(Equal(1))
})
It("Should count three times", func() {
parser := args.Parser()
cmdLine := []string{"--verbose", "--verbose", "--verbose"}
parser.Opt("--verbose", args.Count())
opt, err := parser.ParseArgs(&cmdLine)
Expect(err).To(BeNil())
Expect(opt.Int("verbose")).To(Equal(3))
})
})
Describe("args.IsInt()", func() {
It("Should ensure value supplied is an integer", func() {
parser := args.Parser()
parser.Opt("--power-level", args.IsInt())
cmdLine := []string{"--power-level", "10000"}
opt, err := parser.ParseArgs(&cmdLine)
Expect(err).To(BeNil())
Expect(opt.Int("power-level")).To(Equal(10000))
})
It("Should set err if the option value is not parsable as an integer", func() {
parser := args.Parser()
cmdLine := []string{"--power-level", "over-ten-thousand"}
parser.Opt("--power-level", args.IsInt())
_, err := parser.ParseArgs(&cmdLine)
Expect(err).ToNot(BeNil())
Expect(err.Error()).To(Equal("Invalid value for '--power-level' - 'over-ten-thousand' is not an Integer"))
//Expect(opt.Int("power-level")).To(Equal(0))