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command.go
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command.go
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package chat
// FIXME: Would be sweet if we could piggyback on a cli parser or something.
import (
"bytes"
"errors"
"fmt"
"strings"
"github.com/themester/ssh-chat/chat/message"
"github.com/themester/ssh-chat/set"
)
// The error returned when an invalid command is issued.
var ErrInvalidCommand = errors.New("invalid command")
// The error returned when a command is given without an owner.
var ErrNoOwner = errors.New("command without owner")
// The error returned when a command is performed without the necessary number
// of arguments.
var ErrMissingArg = errors.New("missing argument")
// The error returned when a command is added without a prefix.
var ErrMissingPrefix = errors.New("command missing prefix")
// Command is a definition of a handler for a command.
type Command struct {
// The command's key, such as /foo
Prefix string
// Extra help regarding arguments
PrefixHelp string
// If omitted, command is hidden from /help
Help string
Handler func(*Room, message.CommandMsg) error
// Command requires Op permissions
Op bool
// command requires Admin permissions
Admin bool
}
// Commands is a registry of available commands.
type Commands map[string]*Command
// Add will register a command. If help string is empty, it will be hidden from
// Help().
func (c Commands) Add(cmd Command) error {
if cmd.Prefix == "" {
return ErrMissingPrefix
}
c[cmd.Prefix] = &cmd
return nil
}
// Alias will add another command for the same handler, won't get added to help.
func (c Commands) Alias(command string, alias string) error {
cmd, ok := c[command]
if !ok {
return ErrInvalidCommand
}
c[alias] = cmd
return nil
}
// Run executes a command message.
func (c Commands) Run(room *Room, msg message.CommandMsg) error {
if msg.From() == nil {
return ErrNoOwner
}
cmd, ok := c[msg.Command()[1:]]
if !ok {
return ErrInvalidCommand
}
return cmd.Handler(room, msg)
}
// Help will return collated help text as one string.
func (c Commands) Help(showOp, showAdmin bool) string {
// Filter by op
op := []*Command{}
admin := []*Command{}
normal := []*Command{}
for _, cmd := range c {
if cmd.Op {
op = append(op, cmd)
}
if cmd.Admin {
admin = append(admin, cmd)
}
if !cmd.Op && !cmd.Admin {
normal = append(normal, cmd)
}
}
help := "Available commands:" + message.Newline + NewCommandsHelp(normal).String()
if showOp {
help += message.Newline + "-> Operator commands:" + message.Newline + NewCommandsHelp(op).String()
}
if showAdmin {
help += message.Newline + "-> Admin commands:" + message.Newline + NewCommandsHelp(admin).String()
}
return help
}
var defaultCommands *Commands
func init() {
defaultCommands = &Commands{}
InitCommands(defaultCommands)
}
// InitCommands injects default commands into a Commands registry.
func InitCommands(c *Commands) {
c.Add(Command{
Prefix: "help",
Handler: func(room *Room, msg message.CommandMsg) error {
op := room.IsOp(msg.From())
admin := room.IsMaster(msg.From())
room.Send(message.NewSystemMsg(room.commands.Help(op, admin), msg.From()))
return nil
},
})
c.Add(Command{
Prefix: "me",
Handler: func(room *Room, msg message.CommandMsg) error {
me := strings.TrimLeft(msg.Body(), "/me")
if me == "" {
me = "is at a loss for words."
} else {
me = me[1:]
}
room.Send(message.NewEmoteMsg(me, msg.From()))
return nil
},
})
c.Add(Command{
Prefix: "exit",
Help: "Exit the chat.",
Handler: func(room *Room, msg message.CommandMsg) error {
msg.From().Close()
return nil
},
})
c.Alias("exit", "quit")
c.Alias("q", "quit")
c.Add(Command{
Prefix: "nick",
PrefixHelp: "NAME",
Help: "Rename yourself.",
Handler: func(room *Room, msg message.CommandMsg) error {
args := msg.Args()
if len(args) != 1 {
return ErrMissingArg
}
u := msg.From()
member, ok := room.MemberByID(u.ID())
if !ok {
return errors.New("failed to find member")
}
oldID := member.ID()
newID := SanitizeName(args[0])
if newID == oldID {
return errors.New("new name is the same as the original")
}
member.SetID(newID)
err := room.Rename(oldID, member)
if err != nil {
member.SetID(oldID)
return err
}
return nil
},
})
c.Add(Command{
Admin: true,
Prefix: "setnick",
PrefixHelp: "NAME ANOTHER",
Help: "Rename NAME to ANOTHER username",
Handler: func(room *Room, msg message.CommandMsg) error {
args := msg.Args()
if len(args) < 2 {
return errors.New("invalid arguments")
}
member, ok := room.MemberByID(args[0])
if !ok {
return errors.New("failed to find member")
}
oldID := member.ID()
newID := SanitizeName(args[1])
if newID == oldID {
return errors.New("new name is the same as the original")
}
member.SetID(newID)
err := room.Rename(oldID, member)
if err != nil {
member.SetID(oldID)
return err
}
return nil
},
})
c.Add(Command{
Prefix: "names",
Help: "List users who are connected.",
Handler: func(room *Room, msg message.CommandMsg) error {
theme := msg.From().Config().Theme
colorize := func(u *message.User) string {
return theme.ColorName(u)
}
if theme == nil {
colorize = func(u *message.User) string {
return u.Name()
}
}
names := room.Members.ListPrefix("")
colNames := make([]string, len(names))
for i, uname := range names {
colNames[i] = colorize(uname.Value().(*Member).User)
}
body := fmt.Sprintf("%d connected: %s", len(colNames), strings.Join(colNames, ", "))
room.Send(message.NewSystemMsg(body, msg.From()))
return nil
},
})
c.Alias("names", "list")
c.Add(Command{
Prefix: "theme",
PrefixHelp: "[colors|...]",
Help: "Set your color theme.",
Handler: func(room *Room, msg message.CommandMsg) error {
user := msg.From()
args := msg.Args()
cfg := user.Config()
if len(args) == 0 {
theme := "plain"
if cfg.Theme != nil {
theme = cfg.Theme.ID()
}
var output bytes.Buffer
fmt.Fprintf(&output, "Current theme: %s%s", theme, message.Newline)
fmt.Fprintf(&output, " Themes available: ")
for i, t := range message.Themes {
fmt.Fprintf(&output, t.ID())
if i < len(message.Themes)-1 {
fmt.Fprintf(&output, ", ")
}
}
room.Send(message.NewSystemMsg(output.String(), user))
return nil
}
id := args[0]
for _, t := range message.Themes {
if t.ID() == id {
cfg.Theme = &t
user.SetConfig(cfg)
body := fmt.Sprintf("Set theme: %s", id)
room.Send(message.NewSystemMsg(body, user))
return nil
}
}
return errors.New("theme not found")
},
})
c.Add(Command{
Prefix: "quiet",
Help: "Silence room announcements.",
Handler: func(room *Room, msg message.CommandMsg) error {
u := msg.From()
cfg := u.Config()
cfg.Quiet = !cfg.Quiet
u.SetConfig(cfg)
var body string
if cfg.Quiet {
body = "Quiet mode is toggled ON"
} else {
body = "Quiet mode is toggled OFF"
}
room.Send(message.NewSystemMsg(body, u))
return nil
},
})
c.Add(Command{
Prefix: "slap",
PrefixHelp: "NAME",
Handler: func(room *Room, msg message.CommandMsg) error {
var me string
args := msg.Args()
if len(args) == 0 {
me = "slaps themselves around a bit with a large trout."
} else {
me = fmt.Sprintf("slaps %s around a bit with a large trout.", strings.Join(args, " "))
}
room.Send(message.NewEmoteMsg(me, msg.From()))
return nil
},
})
c.Add(Command{
Prefix: "ignore",
PrefixHelp: "[USER]",
Help: "Hide messages from USER, /unignore USER to stop hiding.",
Handler: func(room *Room, msg message.CommandMsg) error {
id := strings.TrimSpace(strings.TrimLeft(msg.Body(), "/ignore"))
if id == "" {
// Print ignored names, if any.
var names []string
msg.From().Ignored.Each(func(_ string, item set.Item) error {
names = append(names, item.Key())
return nil
})
var systemMsg string
if len(names) == 0 {
systemMsg = "0 users ignored."
} else {
systemMsg = fmt.Sprintf("%d ignored: %s", len(names), strings.Join(names, ", "))
}
room.Send(message.NewSystemMsg(systemMsg, msg.From()))
return nil
}
if id == msg.From().ID() {
return errors.New("cannot ignore self")
}
target, ok := room.MemberByID(id)
if !ok {
return fmt.Errorf("user not found: %s", id)
}
err := msg.From().Ignored.Add(set.Itemize(id, target))
if err == set.ErrCollision {
return fmt.Errorf("user already ignored: %s", id)
} else if err != nil {
return err
}
room.Send(message.NewSystemMsg(fmt.Sprintf("Ignoring: %s", target.Name()), msg.From()))
return nil
},
})
c.Add(Command{
Prefix: "unignore",
PrefixHelp: "USER",
Handler: func(room *Room, msg message.CommandMsg) error {
id := strings.TrimSpace(strings.TrimLeft(msg.Body(), "/unignore"))
if id == "" {
return errors.New("must specify user")
}
if err := msg.From().Ignored.Remove(id); err != nil {
return err
}
room.Send(message.NewSystemMsg(fmt.Sprintf("No longer ignoring: %s", id), msg.From()))
return nil
},
})
}