From 76de8f411590519de6b17115453149ef040b6969 Mon Sep 17 00:00:00 2001
From: lat9nq <22451773+lat9nq@users.noreply.github.com>
Date: Wed, 17 Jan 2024 16:16:04 -0500
Subject: [PATCH] cmake: Add option to specify custom zoneinfo

Enables developers to use a different zoneinfo source than the included submodule.
---
 CMakeLists.txt              |  2 +
 externals/tz/CMakeLists.txt | 73 +++++++++++++++++++++----------------
 2 files changed, 44 insertions(+), 31 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9986f6d..e15cb29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,8 @@ cmake_minimum_required(VERSION 3.10)
 
 project(tzdb2nx VERSION 1.0)
 
+option(TZDB2NX_ZONEINFO_DIR "Specify a custom zoneinfo directory containing time zone data you wish to use" "")
+
 set(CMAKE_CXX_STANDARD 20)
 
 if (APPLE)
diff --git a/externals/tz/CMakeLists.txt b/externals/tz/CMakeLists.txt
index 48bc9c0..c3ceeda 100644
--- a/externals/tz/CMakeLists.txt
+++ b/externals/tz/CMakeLists.txt
@@ -1,48 +1,59 @@
 set(TZ_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/tz" CACHE PATH "Time zone source directory")
 set(TZ_DIR "${CMAKE_CURRENT_BINARY_DIR}/tz")
 set(TZ_TMP_SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/tmpsrc")
-set(TZ_ZONEINFO_DIR "${TZ_DIR}/usr/share/zoneinfo" CACHE PATH "Time zone info data directory")
 set(TZIF_LIST_FILE "${CMAKE_CURRENT_BINARY_DIR}/tzif_list.txt" CACHE PATH "List of zone info files")
+if (TZDB2NX_ZONEINFO_DIR)
+    set(TZ_ZONEINFO_DIR "${TZDB2NX_ZONEINFO_DIR}" CACHE PATH "Time zone info data directory")
+else()
+    set(TZ_ZONEINFO_DIR "${TZ_DIR}/usr/share/zoneinfo" CACHE PATH "Time zone info data directory")
+endif()
 
 find_program(GNU_MAKE make)
 if (NOT GNU_MAKE)
     message(FATAL_ERROR "GNU make not found")
 endif()
 
+find_program(GIT_PROGRAM git)
+if (NOT GIT_PROGRAM)
+    message(FATAL_ERROR "git program not found")
+endif()
+
 if (NOT EXISTS "${TZ_DIR}" OR NOT EXISTS "${TZIF_LIST_FILE}")
-    # tz's makefile can only build in-tree, so copy the whole source tree to a
-    # separate directory before building.
-    execute_process(
-        COMMAND
-            ${GIT_PROGRAM} clone --depth 1 "file://${TZ_SOURCE_DIR}" "${TZ_TMP_SOURCE_DIR}"
-        COMMAND_ERROR_IS_FATAL ANY
-    )
+    if (NOT TZDB2NX_ZONEINFO_DIR)
+        # tz's makefile can only build in-tree, so copy the whole source tree to a
+        # separate directory before building.
+        execute_process(
+            COMMAND
+                ${GIT_PROGRAM} clone --depth 1 "file://${TZ_SOURCE_DIR}" "${TZ_TMP_SOURCE_DIR}"
+            COMMAND_ERROR_IS_FATAL ANY
+        )
 
-    if (APPLE)
-        set(TZ_MAKEFLAGS "LDLIBS=${Intl_LIBRARY}")
-    else()
-        set(TZ_MAKEFLAGS)
+        if (APPLE)
+            set(TZ_MAKEFLAGS "LDLIBS=${Intl_LIBRARY}")
+        else()
+            set(TZ_MAKEFLAGS)
+        endif()
+
+        execute_process(
+            COMMAND
+                ${GNU_MAKE} DESTDIR=${TZ_DIR} ${TZ_MAKEFLAGS} install
+            WORKING_DIRECTORY 
+                ${TZ_TMP_SOURCE_DIR}
+            COMMAND_ERROR_IS_FATAL ANY
+        )
+
+        unset(TZ_MAKEFLAGS)
+
+        # Step taken by Arch Linux packaging, but Nintendo apparently skips it
+        # execute_process(
+        #     COMMAND
+        #         "${TZDB_LOCATION}/zic" -b fat -d ${TZDB_ZONEINFO} africa antarctica asia australasia europe northamerica southamerica etcetera backward factory
+        #     WORKING_DIRECTORY
+        #         "${TZDB_LOCATION}"
+        #     COMMAND_ERROR_IS_FATAL ANY
+        # )
     endif()
 
-    execute_process(
-        COMMAND
-            ${GNU_MAKE} DESTDIR=${TZ_DIR} ${TZ_MAKEFLAGS} install
-        WORKING_DIRECTORY 
-            ${TZ_TMP_SOURCE_DIR}
-        COMMAND_ERROR_IS_FATAL ANY
-    )
-
-    unset(TZ_MAKEFLAGS)
-
-    # Step taken by Arch Linux packaging, but Nintendo apparently skips it
-    # execute_process(
-    #     COMMAND
-    #         "${TZDB_LOCATION}/zic" -b fat -d ${TZDB_ZONEINFO} africa antarctica asia australasia europe northamerica southamerica etcetera backward factory
-    #     WORKING_DIRECTORY
-    #         "${TZDB_LOCATION}"
-    #     COMMAND_ERROR_IS_FATAL ANY
-    # )
-
     execute_process(
         COMMAND
            ${CMAKE_COMMAND} -P ${PROJECT_SOURCE_DIR}/CMakeModules/list_directory.cmake false ON