[Commands] Add #findlanguage Command (#3434)

# Notes
- Add `#findlanguage` command.

zone/command.cpp

@@ -143,6 +143,7 @@ int command_init(void)
 		command_add("findclass", "[Search Criteria] - Search for a class", AccountStatus::Guide, command_findclass) ||
 		command_add("findcurrency", "[Search Criteria] - Search for an alternate currency", AccountStatus::Guide, command_findcurrency) ||
 		command_add("findfaction", "[Search Criteria] - Search for a faction", AccountStatus::Guide, command_findfaction) ||
+		command_add("findlanguage", "[Search Criteria] - Search for a language", AccountStatus::Guide, command_findlanguage) ||
 		command_add("findnpctype", "[Search Criteria] - Search database NPC types", AccountStatus::GMAdmin, command_findnpctype) ||
 		command_add("findrace", "[Search Criteria] - Search for a race", AccountStatus::Guide, command_findrace) ||
 		command_add("findrecipe", "[Search Criteria] - Search for a recipe", AccountStatus::Guide, command_findrecipe) ||
@@ -985,6 +986,7 @@ void command_bot(Client *c, const Seperator *sep)
 #include "gm_commands/findclass.cpp"
 #include "gm_commands/findcurrency.cpp"
 #include "gm_commands/findfaction.cpp"
+#include "gm_commands/findlanguage.cpp"
 #include "gm_commands/findnpctype.cpp"
 #include "gm_commands/findrace.cpp"
 #include "gm_commands/findrecipe.cpp"

zone/command.h

@@ -93,6 +93,7 @@ void command_findcharacter(Client *c, const Seperator *sep);
 void command_findclass(Client *c, const Seperator *sep);
 void command_findcurrency(Client *c, const Seperator *sep);
 void command_findfaction(Client *c, const Seperator *sep);
+void command_findlanguage(Client *c, const Seperator *sep);
 void command_findnpctype(Client *c, const Seperator *sep);
 void command_findrace(Client *c, const Seperator *sep);
 void command_findrecipe(Client *c, const Seperator *sep);

zone/gm_commands/findlanguage.cpp

@@ -0,0 +1,77 @@
+#include "../client.h"
+#include "../../common/languages.h"
+
+void command_findlanguage(Client *c, const Seperator *sep)
+{
+	const auto arguments = sep->argnum;
+	if (!arguments) {
+		c->Message(Chat::White, "Command Syntax: #findlanguage [Search Criteria]");
+		return;
+	}
+
+	if (sep->IsNumber(1)) {
+		const auto language_id = Strings::ToInt(sep->arg[1]);
+		if (EQ::ValueWithin(language_id, LANG_COMMON_TONGUE, LANG_UNKNOWN)) {
+			c->Message(
+				Chat::White,
+				fmt::format(
+					"Language {} | {}",
+					language_id,
+					EQ::constants::GetLanguageName(language_id)
+				).c_str()
+			);
+			return;
+		}
+
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"Language ID {} was not found.",
+				language_id
+			).c_str()
+		);
+		return;
+	}
+
+	const auto& search_criteria = Strings::ToLower(sep->argplus[1]);
+	if (!search_criteria.empty()) {
+		const auto& m = EQ::constants::GetLanguageMap();
+		auto found_count = 0;
+		for (const auto& l : m) {
+			const auto& language_name_lower = Strings::ToLower(l.second);
+			if (Strings::Contains(language_name_lower, search_criteria)) {
+				continue;
+			}
+
+			c->Message(
+				Chat::White,
+				fmt::format(
+					"Language {} | {}",
+					l.first,
+					l.second
+				).c_str()
+			);
+
+			found_count++;
+		}
+
+		auto language_message = (
+			found_count > 0 ?
+			(
+				found_count == 1 ?
+				"A Language was" :
+				fmt::format("{} Languages were", found_count)
+			) :
+			"No Languages were"
+		);
+
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"{} found.",
+				language_message
+			).c_str()
+		);
+	}
+}
+