Go GetOpt

go get gitee.com/go-getopt/go-getopt

package main

import (
    "fmt"
    "os"

    // We use . to use GetOpt, Get and Shift functions conveniently.
    // You can also use common import with package name, if needed
    . "gitee.com/go-getopt/go-getopt"
)

func main() {
    // Pass os.Args, options, and longOptions string
    err := GetOpt(os.Args, "ab:c::", "a-long,b-long:,c-long::")
    if err != nil {
        fmt.Fprintln(os.Stderr, err)
        os.Exit(1)
    }

    // Args is an exported global variable that stores all parsed arguments
    fmt.Println("Arguments:", Args)
    fmt.Println("Program name:", Args[0])

    // a for loop to deal with each arg like shell script does
    for loop := true; loop; {
        switch Get(1) {
        case "-a", "--a-long":
            fmt.Println("Option a")
            Shift(1)
        case "-b", "--b-long":
            fmt.Println("Option b, argument '" + Get(2) + "'")
            Shift(2)
        case "-c", "--c-long":
            if Get(2) == "" {
                fmt.Println("Option c, no argument")
            } else {
                fmt.Println("Option c with arg '" + Get(2) + "'")
            }
            Shift(2)
        case "--":
            Shift(1)
            loop = false
        default:
            fmt.Fprintln(os.Stderr, "Error: wrong argument '"+arg1+"'")
            os.Exit(1)
        }
    }
    fmt.Println("Remains:", Args[1:])
}

getopt --test > /dev/null

[ $? -ne 4 ] &&
    echo "Error: command 'getopt --test' failed in this environment." &&
    exit 1

options=ab:c::
longOptions=a-long,b-long:,c-long::

parsed=$(getopt --options=$options --longoptions=$longOptions --name "$0" -- "$@")

[ $? -ne 0 ] &&
    echo "Error: failed to parse cmd arguments" &&
    exit 1

eval "set -- $parsed"

while true; do
    case "$1" in
        -a|--a-long)
            echo 'Option a'
            shift
        ;;
        -b|--b-long)
            echo "Option b, argument '$2'"
            shift 2
        ;;
        -c|--c-long)
            [ -n "$2" ] &&
            echo "Option c, argument '$2'" ||
            echo 'Option c, no argument'
            shift 2
        --)
            shift
            break
        *)
            echo "Error: wrong argument '$1'"
            exit 1
            ;;
    esac
done
echo "Remains: $@"

# git

# Check if $1 is "push". If so, shift $1 and pass $@ to git-push script
[ "$1" == "push" ] && shift && git-push "$@" && exit

# If not, continue getopt git command

if len(os.Args) >= 2 && os.Args[1] == "push" {
    gitPushArgs := make([]string, 0, len(os.Args)-1)
    gitPushArgs = append(gitPushArgs, "git-push")
    gitPushArgs = append(gitPushArgs, os.Args[2:]...)
    GetOpt(gitPushArgs, options, longOptions)
    // for loop of "git-push"
    return
}
GetOpt(os.Args, options, longOptions)
// for loop of "git"