source: code/trunk/service.go@ 206

package soju

import (
        "flag"
        "fmt"
        "io/ioutil"
        "strings"

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

const serviceNick = "BouncerServ"

type serviceCommandSet map[string]*serviceCommand

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

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
        }

        cmd, params, err := serviceCommands.Get(words)
        if err != nil {
                sendServicePRIVMSG(dc, fmt.Sprintf(`error: %v (type "help" for a list of commands)`, err))
                return
        }

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

func (cmds serviceCommandSet) Get(params []string) (*serviceCommand, []string, error) {
        if len(params) == 0 {
                return nil, nil, fmt.Errorf("no command specified")
        }

        name := params[0]
        params = params[1:]

        cmd, ok := cmds[name]
        if !ok {
                for k := range cmds {
                        if !strings.HasPrefix(k, name) {
                                continue
                        }
                        if cmd != nil {
                                return nil, params, fmt.Errorf("command %q is ambiguous", name)
                        }
                        cmd = cmds[k]
                }
        }
        if cmd == nil {
                return nil, params, fmt.Errorf("command %q not found", name)
        }

        if len(params) == 0 || len(cmd.children) == 0 {
                return cmd, params, nil
        }
        return cmd.children.Get(params)
}

var serviceCommands serviceCommandSet

func init() {
        serviceCommands = serviceCommandSet{
                "help": {
                        usage:  "[command]",
                        desc:   "print help message",
                        handle: handleServiceHelp,
                },
                "network": {
                        children: serviceCommandSet{
                                "create": {
                                        usage:  "-addr <addr> [-name name] [-username username] [-pass pass] [-realname realname] [-nick nick]",
                                        desc:   "add a new network",
                                        handle: handleServiceCreateNetwork,
                                },
                                "status": {
                                        desc:   "show a list of saved networks and their current status",
                                        handle: handleServiceNetworkStatus,
                                },
                                "delete": {
                                        usage:  "<name>",
                                        desc:   "delete a network",
                                        handle: handleServiceNetworkDelete,
                                },
                        },
                },
        }
}

func appendServiceCommandSetHelp(cmds serviceCommandSet, prefix []string, l *[]string) {
        for name, cmd := range cmds {
                words := append(prefix, name)
                if len(cmd.children) == 0 {
                        s := strings.Join(words, " ")
                        *l = append(*l, s)
                } else {
                        appendServiceCommandSetHelp(cmd.children, words, l)
                }
        }
}

func handleServiceHelp(dc *downstreamConn, params []string) error {
        if len(params) > 0 {
                cmd, rest, err := serviceCommands.Get(params)
                if err != nil {
                        return err
                }
                words := params[:len(params)-len(rest)]

                if len(cmd.children) > 0 {
                        var l []string
                        appendServiceCommandSetHelp(cmd.children, words, &l)
                        sendServicePRIVMSG(dc, "available commands: "+strings.Join(l, ", "))
                } else {
                        text := strings.Join(words, " ")
                        if cmd.usage != "" {
                                text += " " + cmd.usage
                        }
                        text += ": " + cmd.desc

                        sendServicePRIVMSG(dc, text)
                }
        } else {
                var l []string
                appendServiceCommandSetHelp(serviceCommands, nil, &l)
                sendServicePRIVMSG(dc, "available commands: "+strings.Join(l, ", "))
        }
        return nil
}

func newFlagSet() *flag.FlagSet {
        fs := flag.NewFlagSet("", flag.ContinueOnError)
        fs.SetOutput(ioutil.Discard)
        return fs
}

func handleServiceCreateNetwork(dc *downstreamConn, params []string) error {
        fs := newFlagSet()
        addr := fs.String("addr", "", "")
        name := fs.String("name", "", "")
        username := fs.String("username", "", "")
        pass := fs.String("pass", "", "")
        realname := fs.String("realname", "", "")
        nick := fs.String("nick", "", "")

        if err := fs.Parse(params); err != nil {
                return err
        }
        if *addr == "" {
                return fmt.Errorf("flag -addr is required")
        }

        if *nick == "" {
                *nick = dc.nick
        }

        var err error
        network, err := dc.user.createNetwork(&Network{
                Addr:     *addr,
                Name:     *name,
                Username: *username,
                Pass:     *pass,
                Realname: *realname,
                Nick:     *nick,
        })
        if err != nil {
                return fmt.Errorf("could not create network: %v", err)
        }

        sendServicePRIVMSG(dc, fmt.Sprintf("created network %q", network.GetName()))
        return nil
}

func handleServiceNetworkStatus(dc *downstreamConn, params []string) error {
        dc.user.forEachNetwork(func(net *network) {
                var statuses []string
                var details string
                if uc := net.upstream(); uc != nil {
                        statuses = append(statuses, "connected as "+uc.nick)
                        details = fmt.Sprintf("%v channels", len(uc.channels))
                } else {
                        statuses = append(statuses, "disconnected")
                }

                if net == dc.network {
                        statuses = append(statuses, "current")
                }

                s := fmt.Sprintf("%v (%v) [%v]", net.GetName(), net.Addr, strings.Join(statuses, ", "))
                if details != "" {
                        s += ": " + details
                }
                sendServicePRIVMSG(dc, s)
        })
        return nil
}

func handleServiceNetworkDelete(dc *downstreamConn, params []string) error {
        if len(params) != 1 {
                return fmt.Errorf("expected exactly one argument")
        }

        net := dc.user.getNetwork(params[0])
        if net == nil {
                return fmt.Errorf("unknown network %q", params[0])
        }

        if err := dc.user.deleteNetwork(net.ID); err != nil {
                return err
        }

        sendServicePRIVMSG(dc, fmt.Sprintf("deleted network %q", net.GetName()))
        return nil
}