Add welcome command (#10)

Add welcome command

Signed-off-by: Etzelia <etzelia@hotmail.com>

Reviewed-on: https://git.etztech.xyz/Etzelia/sedbot/pulls/10

discord/welcome.go

@@ -0,0 +1,53 @@
+package discord
+
+import (
+	"fmt"
+
+	"github.com/bwmarrin/discordgo"
+)
+
+func init() {
+	commands["welcome"] = command{
+		validate: func(cmd commandInit) bool {
+			return isStaff(cmd.message.Member.Roles, cmd.config.StaffRoles)
+		},
+		run: func(cmd commandInit) (string, error) {
+			if err := cmd.session.ChannelMessageDelete(cmd.message.ChannelID, cmd.message.ID); err != nil {
+				return "", err
+			}
+
+			orphans := make([]*discordgo.Member, 0)
+
+			members, err := cmd.session.GuildMembers(cmd.message.GuildID, "", 1000)
+			if err != nil {
+				return "", err
+			}
+			for _, member := range members {
+				if len(member.Roles) == 0 {
+					orphans = append(orphans, member)
+				}
+			}
+
+			resp := "There are no members without roles!"
+			if len(orphans) > 0 {
+				resp = "```\n"
+				for _, orphan := range orphans {
+					resp += fmt.Sprintf("<@%s>\n", orphan.User.ID)
+				}
+				resp += "```"
+			}
+
+			channel, err := cmd.session.UserChannelCreate(cmd.message.Author.ID)
+			if err != nil {
+				return "", nil
+			}
+
+			if _, err := cmd.session.ChannelMessageSend(channel.ID, resp); err != nil {
+				return "", nil
+			}
+
+			return "", nil
+		},
+		help: "Get a list of people with no roles",
+	}
+}