whatever.go

package main                               
                                           
import (                                   
    "fmt"                                  
    "flag"                                 
)                                          
                                           
func help(args []string) {                 
    help := []string{                      
        "YO",                              
        "THIS",                            
    }                                      
    for _, line := range help {            
        fmt.Println(line)                  
    }                                      
}                                          
                                           
func test(args []string) {                 
    fmt.Println("test:", args)             
}                                          
                                           
func main() {                              
    commands := map[string]func([]string){ 
        "help": help,                      
        "test": test,                      
    }                                      
    flag.Parse()                           
    cmd := flag.Arg(0)                     
    if cmd == "" {                         
        cmd = "help"                       
    }                                      
    if f, ok := commands[cmd]; ok {        
        // Includes current `cmd`.         
        f(flag.Args())                     
    } else {                               
        help([]string{})                   
    }                                      
}