# bolt

The nuts-and-bolts of Discord bots. Bolt is a wrapper for [discordgo](https://github.com/bwmarrin/discordgo) that provides quick and easy bootstrapping for simple Discord bots.

## Usage
### Token
Bolt requires a Discord bot token to run, the token must be set as an environment variable labeled "DISCORD_TOKEN"

### Commands
Commands are represented by the command struct and contain all needed information for bolt to handle the command payload. Including the command timeout as well as the Roles allowed to run the command.
```go
type Command struct {
	Trigger string        //command that triggers payload NOT including the indicator
	Payload Payload       //payload function to run when a command is detected
	Timeout time.Duration //the amount of time before command can be run again
	lastRun time.Time     //timestamp of last command run
	Roles   []string      //roles that can use command, if none are set anyone can run
}
```

### Payload
Payload functions are executed when a command is detected
```go
type Payload func(msg Message) error
```
Payload functions are given a Message argument containing the needed data for handling commands
```go
type Message struct {
	Author      string   //username of message author
	ID          string   //discord ID of message author
	Words       []string //words from message split on whitespace
	Content     string   //entire message content
	Channel     string   //message channel
	Server      string   //message guild
	Attachments []MessageAttachment //message attachments
}
```
The Message struct also exposes some methods to support replying to, or acknowledging command messages
```go
func (m *Message) React(emoji Reaction) error
```
The React method will react to the command message by adding the requested emoji as a reaction. Bolt comes with a few preset emoji's for easy handling but any valid emoji string can be passed.
```go
func (m *Message) Respond(res string) error
```
The Respond method will send the value of <b>res</b> in response to the command message.

### Example
```go
package main

import (
	"time"

	"code.jakeyoungdev.com/jake/bolt"
)

func main() {
	//bolt defaults the command indicator to '.' however that can be changed with the options
	//Example: bolt.New(bolt.WithIndicator('!')) would support commands like !ping
	b := bolt.New(bolt.WithLogLevel(bolt.LogLevelCmd))

	b.AddCommands(
		// basic ping pong command, .ping can be run at anytime by anyone and will reply "pong"
		bolt.Command{
			Trigger: "ping",
			Payload: func(msg bolt.Message) error {
				return msg.Respond("pong")
			},
		},
		// .react will add a +1 reaction to the command message, .react can be run by anyone at any rate
		bolt.Command{
			Trigger: "react",
			Payload: func(msg bolt.Message) error {
				return msg.React(bolt.ReactionThumbsUp)
			},
		},
		// .time responds with the current date/time, .time can be run once every 25 seconds by any role
		bolt.Command{
			Trigger: "time",
			Payload: func(msg bolt.Message) error {
				return msg.Respond(time.Now().String())
			},
			Timeout: time.Second * 25,
		},
		// .role command can be ran every 10 seconds by anyone with the admin role and will return the string "admin"
		bolt.Command{
			Trigger: "role",
			Payload: func(msg bolt.Message) error {
				return msg.Respond("admin")
			},
			Timeout: time.Second * 10,
			Roles:   []string{"admin"},
		},
	)

	//start is a blocking call that handles safe-shutdown, all configuration and setup should be done before calling Start()
	err := b.Start()
	if err != nil {
		panic(err)
	}
}
```

## Development
bolt is in development at the moment and may break occasionally before a v1 release