Added Guild Members Search Function (#1150)

* Added Guild Members Search Function

* Updated method name to be consistent with other endpoints

* Refactored and moved GuildMembersSearch method for consistency

endpoints.go

@@ -72,6 +72,7 @@ var (
 	EndpointGuildPreview             = func(gID string) string { return EndpointGuilds + gID + "/preview" }
 	EndpointGuildChannels            = func(gID string) string { return EndpointGuilds + gID + "/channels" }
 	EndpointGuildMembers             = func(gID string) string { return EndpointGuilds + gID + "/members" }
+	EndpointGuildMembersSearch       = func(gID string) string { return EndpointGuildMembers(gID) + "/search" }
 	EndpointGuildMember              = func(gID, uID string) string { return EndpointGuilds + gID + "/members/" + uID }
 	EndpointGuildMemberRole          = func(gID, uID, rID string) string { return EndpointGuilds + gID + "/members/" + uID + "/roles/" + rID }
 	EndpointGuildBans                = func(gID string) string { return EndpointGuilds + gID + "/bans" }

restapi.go

@@ -696,6 +696,29 @@ func (s *Session) GuildMembers(guildID string, after string, limit int) (st []*M
 	return
 }
 
+// GuildMembersSearch returns a list of guild member objects whose username or nickname starts with a provided string
+// guildID  : The ID of a Guild
+// query    : Query string to match username(s) and nickname(s) against
+// limit    : Max number of members to return (default 1, min 1, max 1000)
+func (s *Session) GuildMembersSearch(guildID, query string, limit int) (st []*Member, err error) {
+
+	uri := EndpointGuildMembersSearch(guildID)
+
+	queryParams := url.Values{}
+	queryParams.Set("query", query)
+	if limit > 1 {
+		queryParams.Set("limit", strconv.Itoa(limit))
+	}
+
+	body, err := s.RequestWithBucketID("GET", uri+"?"+queryParams.Encode(), nil, uri)
+	if err != nil {
+		return
+	}
+
+	err = unmarshal(body, &st)
+	return
+}
+
 // GuildMember returns a member of a guild.
 //  guildID   : The ID of a Guild.
 //  userID    : The ID of a User