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|
package control
import (
"fmt"
"log"
"os"
"strings"
)
type Description struct {
Short string
Usage []string
}
type Command interface {
Name() string
Description() Description
Execute(args []string) error
}
var (
commandRegistry = make(map[string]Command)
ctllog = log.New(os.Stderr, "v2ctl> ", 0)
)
func RegisterCommand(cmd Command) error {
entry := strings.ToLower(cmd.Name())
if entry == "" {
return newError("empty command name")
}
commandRegistry[entry] = cmd
return nil
}
func GetCommand(name string) Command {
cmd, found := commandRegistry[name]
if !found {
return nil
}
return cmd
}
type hiddenCommand interface {
Hidden() bool
}
func PrintUsage() {
for name, cmd := range commandRegistry {
if _, ok := cmd.(hiddenCommand); ok {
continue
}
fmt.Println(" ", name, "\t\t\t", cmd.Description())
}
}
|
