adding reaction support (#2)

- some rework of structure to allow for more puposeful response usage
- react and response now live on the message itself
- message structs split into own file
- readme updated to use new methods

Reviewed-on: #2
Co-authored-by: jake <jake.young.dev@gmail.com>
Co-committed-by: jake <jake.young.dev@gmail.com>

README.md

@@ -1,28 +1,49 @@
 # bolt
 
-The nuts and bolts of a Discord bots. Bolt is a wrapper for [discordgo](https://github.com/bwmarrin/discordgo) that provides very quick bootstrapping for simple Discord bots. 
+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. Any roles in the Command struct can run the command, if the Roles field is empty anyone can run the command.
+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 the command
+	Roles   []string      //roles that can use command, if none are set anyone can run
 }
 ```
 
 ### Payload
-Payload functions are executed when a command is detected, if no errors are returned and the returned string is not empty, then the returned string is sent in reply to the command message.
+Payload functions are executed when a command is detected
 ```go
-type Payload func(msg Message) (string, error)
+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
@@ -32,7 +53,6 @@ import (
 	"time"
 
 	"code.jakeyoungdev.com/jake/bolt"
-	_ "github.com/joho/godotenv/autoload"
 )
 
 func main() {
@@ -41,26 +61,33 @@ func main() {
 	b := bolt.New(bolt.WithLogLevel(bolt.LogLevelCmd))
 
 	b.AddCommands(
-        // .ping can be run at any time by anyone and will respond with 'pong'
+		// 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) (string, error) {
+			Payload: func(msg bolt.Message) error {
-				return "pong", nil //any strings returned will be sent in response to the Discord message
+				return msg.Respond("pong")
 			},
 		},
-        // .time can be run every 25 seconds by anyone and will respond with 'yer'
+		// .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) (string, error) {
+			Payload: func(msg bolt.Message) error {
-				return "yer", nil
+				return msg.Respond(time.Now().String())
 			},
 			Timeout: time.Second * 25,
 		},
-        // .role can be run every 10 seconds by anyone with the 'admin' role and will respond with 'hi'
+		// .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) (string, error) {
+			Payload: func(msg bolt.Message) error {
-				return "hi", nil
+				return msg.Respond("admin")
 			},
 			Timeout: time.Second * 10,
 			Roles:   []string{"admin"},

bolt.go

@@ -126,10 +126,10 @@ func (b *bolt) messageHandler(s *dg.Session, msg *dg.MessageCreate) {
 		return
 	}
 
-	//if there is no content it is likely an image or a GIF, updating message content for
+	//if there is no content it is likely an image, gif, or sticker, updating message content for
 	//better logging and to avoid confusion
 	if len(msg.Content) == 0 {
-		msg.Content = "GIF/IMAGE"
+		msg.Content = "[Embedded Content]"
 	}
 
 	if b.logLvl == LogLevelAll {
@@ -190,28 +190,44 @@ func (b *bolt) handleCommand(msg *dg.MessageCreate, s *dg.Session, server *dg.Gu
 		}
 	}
 
-	//run command payload
+	plMsg := Message{
-	res, err := run.Payload(Message{
 		Author:    msg.Author.Username,
 		ID:        msg.Author.ID,
+		msgID:     msg.ID,
 		Words:     words,
 		Content:   msg.Content,
 		Channel:   channel.Name,
+		channelID: msg.ChannelID,
 		Server:    server.Name,
+		serverID:  server.ID,
+		sesh:      b,
+	}
+
+	//check for file attachments
+	if len(msg.Attachments) > 0 {
+		var att []MessageAttachment
+		for _, a := range msg.Attachments {
+			att = append(att, MessageAttachment{
+				ID:           a.ID,
+				URL:          a.URL,
+				ProxyURL:     a.ProxyURL,
+				Filename:     a.Filename,
+				ContentType:  a.ContentType,
+				Width:        a.Width,
+				Height:       a.Height,
+				Size:         a.Size,
+				DurationSecs: a.DurationSecs,
 			})
-
-	if err != nil {
-		return err
 		}
 
-	//if a reply is returned send back to Discord
+		plMsg.Attachments = att
-	if res != "" {
+	}
-		reply := b.createReply(res, msg.ID, msg.ChannelID, msg.GuildID)
+
-		_, err := s.ChannelMessageSendComplex(msg.ChannelID, reply)
+	//run command payload
+	err = run.Payload(plMsg)
 	if err != nil {
 		return err
 	}
-	}
 
 	//update run time
 	run.lastRun = time.Now()

command.go

@@ -1,6 +1,8 @@
 package bolt
 
-import "time"
+import (
+	"time"
+)
 
 // custom Discord commands
 type Command struct {
@@ -12,14 +14,4 @@ type Command struct {
 }
 
 // command payload functions, any strings returned are sent as a response to the command
-type Payload func(msg Message) (string, error)
+type Payload func(msg Message) error
-
-// message information passed to payload function
-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
-}

message.go

@@ -0,0 +1,57 @@
+package bolt
+
+import "fmt"
+
+//built-in Discord reactions
+type Reaction string
+
+const (
+	ReactionThumbsUp      Reaction = ":+1:"
+	ReactionThumbsDown    Reaction = ":-1:"
+	ReactionPointUp       Reaction = ":point_up:"
+	ReactionPointDown     Reaction = ":point_down:"
+	ReactionHotdog        Reaction = ":hotdog:"
+	ReactionGiraffe       Reaction = ":giraffe:"
+	ReactionWatermelon    Reaction = ":watermelon:"
+	ReactionNoPedestrians Reaction = ":no_pedestrian:"
+)
+
+// information about attachments to messages
+type MessageAttachment struct {
+	ID           string
+	URL          string
+	ProxyURL     string
+	Filename     string
+	ContentType  string
+	Width        int
+	Height       int
+	Size         int
+	DurationSecs float64
+}
+
+// represents a Discord message
+type Message struct {
+	Author      string   //username of message author
+	ID          string   //discord ID of message author
+	msgID       string   //id string of message
+	Words       []string //words from message split on whitespace
+	Content     string   //entire message content
+	Channel     string   //message channel
+	channelID   string   //id of channel message was sent in
+	Server      string   //message guild
+	serverID    string   //id of guild message was sent in
+	Attachments []MessageAttachment
+	sesh        *bolt
+}
+
+// applies reaction to message
+func (m *Message) React(emoji Reaction) error {
+	return m.sesh.MessageReactionAdd(m.channelID, m.msgID, fmt.Sprint(emoji))
+}
+
+// sends the value of res in response to the message
+func (m *Message) Respond(res string) error {
+	rep := m.sesh.createReply(res, m.msgID, m.channelID, m.serverID)
+	_, err := m.sesh.ChannelMessageSendComplex(m.channelID, rep)
+	return err
+}