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router.go
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router.go
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package dgc
import (
"regexp"
"strings"
"github.com/bwmarrin/discordgo"
)
// regexSplitting represents the regex to split the arguments at
var regexSplitting = regexp.MustCompile("\\s+")
// Router represents a DiscordGo command router
type Router struct {
Prefixes []string
IgnorePrefixCase bool
BotsAllowed bool
Commands []*Command
Middlewares []Middleware
PingHandler ExecutionHandler
Storage map[string]*ObjectsMap
}
// Create makes sure all maps get initialized
func Create(router *Router) *Router {
router.Storage = make(map[string]*ObjectsMap)
return router
}
// RegisterCmd registers a new command
func (router *Router) RegisterCmd(command *Command) {
router.Commands = append(router.Commands, command)
}
// GetCmd returns the command with the given name if it exists
func (router *Router) GetCmd(name string) *Command {
// Loop through all commands to find the correct one
for _, command := range router.Commands {
// Define the slice to check
toCheck := make([]string, len(command.Aliases)+1)
toCheck = append(toCheck, command.Name)
toCheck = append(toCheck, command.Aliases...)
// Check the prefix of the string
if stringArrayContains(toCheck, name, command.IgnoreCase) {
return command
}
}
return nil
}
// RegisterMiddleware registers a new middleware
func (router *Router) RegisterMiddleware(middleware Middleware) {
router.Middlewares = append(router.Middlewares, middleware)
}
// InitializeStorage initializes a storage map
func (router *Router) InitializeStorage(name string) {
router.Storage[name] = newObjectsMap()
}
// Initialize initializes the message event listener
func (router *Router) Initialize(session *discordgo.Session) {
session.AddHandler(router.Handler())
}
// Handler provides the discordgo handler for the given router
func (router *Router) Handler() func(*discordgo.Session, *discordgo.MessageCreate) {
return func(session *discordgo.Session, event *discordgo.MessageCreate) {
// Define useful variables
message := event.Message
content := message.Content
// Check if the message was sent by a bot
if message.Author.Bot && !router.BotsAllowed {
return
}
// Execute the ping handler if the message equals the current bot's mention
if (content == "<@!"+session.State.User.ID+">" || content == "<@"+session.State.User.ID+">") && router.PingHandler != nil {
router.PingHandler(&Ctx{
Session: session,
Event: event,
Arguments: ParseArguments(""),
Router: router,
})
return
}
// Check if the message starts with one of the defined prefixes
hasPrefix, content := stringHasPrefix(content, router.Prefixes, router.IgnorePrefixCase)
if !hasPrefix {
return
}
// Get rid of additional spaces
content = strings.Trim(content, " ")
// Check if the message is empty after the prefix processing
if content == "" {
return
}
// Split the messages at any whitespace
parts := regexSplitting.Split(content, -1)
// Check if the message starts with a command name
for _, command := range router.Commands {
// Check if the first part is the current command
if !stringArrayContains(getIdentifiers(command), parts[0], command.IgnoreCase) {
continue
}
content = strings.Join(parts[1:], " ")
// Define the command context
ctx := &Ctx{
Session: session,
Event: event,
Arguments: ParseArguments(content),
CustomObjects: newObjectsMap(),
Router: router,
Command: command,
}
// Trigger the command
command.trigger(ctx)
}
}
}
func getIdentifiers(command *Command) []string {
// Define an array containing the commands name and the aliases
toCheck := make([]string, len(command.Aliases)+1)
toCheck = append(toCheck, command.Name)
toCheck = append(toCheck, command.Aliases...)
return toCheck
}