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# Opts
Opts is a simple Go library implementing unicode-aware getopt(3)- and
getopt_long(3) flag parsing in Go. For details, check out the godoc
documentation.
Note that unlike the `getopt()` C function, the ‘:’ and ‘?’ flags are not
returned on errors — the errors are instead returned via the `err` return
value of `opts.Get()` and `opts.GetLong()`. Additionally, a leading ‘:’
in the opt-string provided to `opts.Get()` is not supported; you are
responsible for your own I/O.
## Example Usage
The following demonstrates an example usage of the `opts.Get()` function…
```go
package main
import (
"fmt"
"os"
"git.sr.ht/~mango/opts"
)
func usage() {
fmt.Fprintf(os.Stderr, "Usage: %s [-ßλ] [-a arg]\n", os.Args[0])
os.Exit(1)
}
func main() {
flags, optind, err := opts.Get(os.Args, "a:ßλ")
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
usage()
}
for _, opt := range opts {
switch opt.Key {
case 'a':
fmt.Println("-a given with argument", opt.Value)
case 'ß':
fmt.Println("-ß given")
case 'λ':
fmt.Println("-λ given")
}
}
// The remaining arguments
rest := os.Args[optind:]
}
```
…and the following demonstrates an example usage of the `opts.GetLong()`
function:
```go
package main
import (
"fmt"
"os"
"git.sr.ht/~mango/opts"
)
const noShortFlag = -1
func usage() {
fmt.Fprintf(os.Stderr, "Usage: %s [-ßλ] [-a arg] [--no-short]\n", os.Args[0])
os.Exit(1)
}
func main() {
flags, optind, err := opts.GetLong(os.Args, []opts.LongOpt{
{Short: 'a', Long: "add", Arg: Required},
{Short: 'ß', Long: "sheiße", Arg: None},
{Short: 'λ', Long: "λεωνίδας", Arg: None},
{Short: noShortFlag, Long: "no-short", Arg: None},
})
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
usage()
}
for _, opt := range opts {
switch opt.Key {
case 'a':
fmt.Println("-a or --add given with argument", opt.Value)
case 'ß':
fmt.Println("-ß or --sheiße given")
case 'λ':
fmt.Println("-λ or --λεωνίδας given")
case noShortFlag:
fmt.Println("--no-short given")
}
}
// The remaining arguments
rest := os.Args[optind:]
}
```
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