source: code/trunk/service.go@ 117

package soju

import (
        "fmt"
        "strings"

        "github.com/google/shlex"
        "gopkg.in/irc.v3"
)

const serviceNick = "BouncerServ"

type serviceCommand struct {
        usage  string
        desc   string
        handle func(dc *downstreamConn, params []string) error
}

func sendServicePRIVMSG(dc *downstreamConn, text string) {
        dc.SendMessage(&irc.Message{
                Prefix:  &irc.Prefix{Name: serviceNick},
                Command: "PRIVMSG",
                Params:  []string{dc.nick, text},
        })
}

func handleServicePRIVMSG(dc *downstreamConn, text string) {
        words, err := shlex.Split(text)
        if err != nil {
                sendServicePRIVMSG(dc, fmt.Sprintf("error: failed to parse command: %v", err))
                return
        }

        var name string
        var params []string
        if len(words) > 0 {
                name = strings.ToLower(words[0])
                params = words[1:]
        }

        cmd, ok := serviceCommands[name]
        if !ok {
                sendServicePRIVMSG(dc, fmt.Sprintf(`error: unknown command %q (type "help" for a list of commands)`, name))
                return
        }

        if err := cmd.handle(dc, params); err != nil {
                sendServicePRIVMSG(dc, fmt.Sprintf("error: %v", err))
        }
}

var serviceCommands map[string]serviceCommand

func init() {
        serviceCommands = map[string]serviceCommand{
                "help": {
                        usage:  "[command]",
                        desc:   "print help message",
                        handle: handleServiceHelp,
                },
        }
}

func handleServiceHelp(dc *downstreamConn, params []string) error {
        if len(params) > 0 {
                name := strings.ToLower(params[0])
                cmd, ok := serviceCommands[name]
                if !ok {
                        return fmt.Errorf("unknown command %q", name)
                }

                text := name
                if cmd.usage != "" {
                        text += " " + cmd.usage
                }
                text += ": " + cmd.desc

                sendServicePRIVMSG(dc, text)
        } else {
                var l []string
                for name := range serviceCommands {
                        l = append(l, name)
                }
                sendServicePRIVMSG(dc, "available commands: "+strings.Join(l, ", "))
        }
        return nil
}