go-utils/utils/go-flags/main.go

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2020-07-20 02:06:17 +00:00
package main
import (
"fmt"
"github.com/jessevdk/go-flags"
)
func main() {
// Callback which will invoke callto:<argument> to call a number.
// Note that this works just on OS X (and probably only with
// Skype) but it shows the idea.
// opts.Call = func(num string) {
// cmd := exec.Command("open", "callto:"+num)
// cmd.Start()
// cmd.Process.Release()
// }
// Make some fake arguments to parse.
// args := []string{
// "-vv",
// "--offset=5",
// "-n", "Me",
// "-p", "3",
// "-s", "hello",
// "-s", "world",
// "--ptrslice", "hello",
// "--ptrslice", "world",
// "--intmap", "a:1",
// "--intmap", "b:5",
// "--filename", "hello.go",
// "id",
// "10",
// "remaining1",
// "remaining2",
// }
// Parse flags from `args'. Note that here we use flags.ParseArgs for
// the sake of making a working example. Normally, you would simply use
// flags.Parse(&opts) which uses os.Args
// _, err := flags.ParseArgs(&opts, args)
_, err := flags.Parse(&opts)
if err != nil {
panic(err)
}
fmt.Printf("Verbosity: %v\n", opts.Verbose)
fmt.Printf("Offset: %d\n", opts.Offset)
fmt.Printf("Name: %s\n", opts.Name)
// fmt.Printf("Ptr: %d\n", *opts.Ptr)
// fmt.Printf("StringSlice: %v\n", opts.StringSlice)
// fmt.Printf("PtrSlice: [%v %v]\n", *opts.PtrSlice[0], *opts.PtrSlice[1])
// fmt.Printf("IntMap: [a:%v b:%v]\n", opts.IntMap["a"], opts.IntMap["b"])
// fmt.Printf("Filename: %v\n", opts.Filename)
// fmt.Printf("Args.ID: %s\n", opts.Args.ID)
// fmt.Printf("Args.Num: %d\n", opts.Args.Num)
// fmt.Printf("Args.Rest: %v\n", opts.Args.Rest)
}
var opts struct {
// Slice of bool will append 'true' each time the option
// is encountered (can be set multiple times, like -vvv)
Verbose []bool `short:"v" long:"verbose" description:"Show verbose debug information"`
// Example of automatic marshalling to desired type (uint)
Offset uint `long:"offset" description:"Offset"`
// Example of a callback, called each time the option is found.
// Call func(string) `short:"c" description:"Call phone number"`
// Example of a required flag
Name string `short:"n" long:"name" description:"A name" required:"true" env:"ENV_NAME"`
}