From 414757188e1ea9f74eeffb547f8b4f5544f371cf Mon Sep 17 00:00:00 2001
From: Dustin Pianalto <dustin@djpianalto.com>
Date: Sun, 24 Jan 2021 01:05:16 -0900
Subject: [PATCH] remove duplicate prefixes

---
 internal/exts/guild/guild.go |  4 ++++
 internal/utils/utils.go      | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/internal/exts/guild/guild.go b/internal/exts/guild/guild.go
index ef2cb44..cd6fb52 100644
--- a/internal/exts/guild/guild.go
+++ b/internal/exts/guild/guild.go
@@ -8,6 +8,7 @@ import (
 	"github.com/dustinpianalto/geeksbot"
 	"github.com/dustinpianalto/geeksbot/internal/discord_utils"
 	"github.com/dustinpianalto/geeksbot/internal/services"
+	"github.com/dustinpianalto/geeksbot/internal/utils"
 )
 
 var AddPrefixCommand = &disgoman.Command{
@@ -39,6 +40,7 @@ func addPrefixCommandFunc(ctx disgoman.Context, args []string) {
 		}
 	} else {
 		guild.Prefixes = append(guild.Prefixes, args...)
+		guild.Prefixes = utils.RemoveDuplicateStrings(guild.Prefixes)
 		guild, err = services.GuildService.UpdateGuild(guild)
 		if err != nil {
 			discord_utils.SendErrorMessage(ctx, "Error adding prefixes to guild.", err)
@@ -92,6 +94,8 @@ func removePrefixCommandFunc(ctx disgoman.Context, args []string) {
 				}
 			}
 		}
+		removed = utils.RemoveDuplicateStrings(removed)
+		guild.Prefixes = utils.RemoveDuplicateStrings(guild.Prefixes)
 		guild, err = services.GuildService.UpdateGuild(guild)
 		if err != nil {
 			discord_utils.SendErrorMessage(ctx, "Error removing prefixes from guild.", err)
diff --git a/internal/utils/utils.go b/internal/utils/utils.go
index d4b585b..8b8b330 100644
--- a/internal/utils/utils.go
+++ b/internal/utils/utils.go
@@ -1 +1,14 @@
 package utils
+
+func RemoveDuplicateStrings(s []string) []string {
+	keys := make(map[string]bool)
+	o := []string{}
+
+	for _, e := range s {
+		if _, v := keys[e]; !v {
+			keys[e] = true
+			o = append(o, e)
+		}
+	}
+	return o
+}