Message

All of the things you type and send will be messages

Field

Field	Description
.Message.ID	ID of the message.
.Message.ChannelID	Channel ID this message is in.
.Message.GuildID	Guild ID in which the message is.
.Message.Content	Text content on this message.
.Message.Timestamp	Timestamp of the message in type discordgo.Timestamp (use .Message.Timestamp.Parse to get type time.Time and .Parse.String method returns type string).
.Message.EditedTimestamp	The time at which the last edit of the message occurred, if it has been edited.
.Message.MentionRoles	The roles mentioned in the message.
.Message.MentionEveryone	Whether the message mentions everyone.
.Message.Author	Author of the message (User object).
.Message.Attachments	Attachments to this message (slice of attachment objects).
.Message.Embeds	Embeds on this message (slice of embed objects).
.Message.Mentions	Users this message mentions.
.Message.Reactions	Reactions on this message (only available from getMessage).
.Message.Type	The type of the message.
.Message.Pinned	Whether this message is pinned.
.Args	List of everything that is passed to .Message.Content. .Args is a slice of type string. Example here.
.Cmd	.Cmd is of type string and shows all arguments that trigger custom command, part of .Args. Starting from {{index .Args 0}}. Example here.
.CmdArgs	List of all the arguments passed after .Cmd (.Cmd is the actual trigger) .CmdArgs is a slice of type string. Example here.
.StrippedMsg	"Strips" or cuts off the triggering part of the message and prints out everything else after that. Bear in mind, when using regex as trigger, for example "day" and input message is "Have a nice day my dear YAG!" output will be "my dear YAG!" - rest is cut off. Example here.

Example:

• We will demonstrate .Args, .Cmd, .CmdArgs, and .StrippedMsg.

Now your whole trigger: -hello and you type in -hello the world.
.Args will returns: {{.Args}}, and it is of type {{printf "%T" .Args}}. Its length is {{len .Args}}.
.Cmd will returns: {{.Cmd}}, and it is of type {{printf "%T" .Cmd}}. Its length is {{len .Cmd}}.
.CmdArgs will returns: {{.CmdArgs}}, and it is of type {{printf "%T" .CmdArgs}}. Its length is {{len .CmdArgs}}.
.StrippedMsg will returns: {{.StrippedMsg}}, and it is of type {{printf "%T" .StrippedMsg}}. Its length is **{{len .StrippedMsg}}.
Index the .Args and .CmdArgs:
.Args: {{index .Args 0}} | {{index .Args 1}} | {{index .Args 2}}
.CmdArgs: {{index .CmdArgs 0}} | {{index .CmdArgs 1}}

The outputs of the command.

Message object in Discord documentation (read it if you want to write complex codes).

More Info

You can fetch a message by ID or use the trigger message and get some information about it. Message returns the following things that you can access with it:

Field	Type
.Message.ID	Int
.Message.ChannelID	Int
.Message.Author	User Object
.Message.Timestamp	String
.Message.Attachments	Array of Attachments
.Message.Embeds	Array of Embed
.Message.Mentions	Array of User Object
.Message.Reactions	Array of Reactions
.Message.Content	String

Attachment

Either starts with (index .Message.Attachments 0). or a variable with the attachment type.

Field	Type	Description
ID	Int	The ID of the attachment
URL	String	cdn.discordapp.com URL
ProxyURL	String	media.discordapp.com URL
Filename	String	Filename of the attachment
Width	Int	Width of the attachment (if image) in pixels
Height	Int	Height of the attachment (if image) in pixels
Size	Int	Size of the attachment in bytes

Reaction

Either starts with (index .Message.Reactions 0) or a variable with the reaction type.

Field	Type	Description
Count	Int	Times this emoji has been used to react
Emoji	Emoji	The emoji used in the reaction

Emoji

Either starts with (index .Message.Reactions 0).Emoji or a variable of the reaction type.

Field	Type	Description
ID	Int	ID of the emoji
Name	String	Name of the emoji (if Unicode emoji this will be the emote)
Animated	Boolean	Whether the emoji is animated or not

There are more fields which can be used, but they are either obsolete or only used with Global Emotes. Example to fetch the name of the first reaction on a message provided through the getMessage template:

{{$message := getMessage nil (index .Args 1)}}
{{if $message}}
{{if $message.Reactions}}
Name of the first reaction: {{(index $message.Reactions 0).Emoji.Name}}
{{else}}No reactions on this message{{end}}
{{else}}Unknown message{{end}}