From 71183fb9ba82bd7b177408bf58781d02bdcb3311 Mon Sep 17 00:00:00 2001
From: topazus <topazus@outlook.com>
Date: Sun, 24 Dec 2023 15:15:48 +0800
Subject: [PATCH] CMake: add cmake installation; add SIMPLEINI_USE_SYSTEM_GTEST
 option

---
 CMakeLists.txt           | 34 +++++++++++++++++++++++++++++++++-
 SimpleIniConfig.cmake.in |  8 ++++++++
 tests/CMakeLists.txt     | 20 ++++++++++++--------
 3 files changed, 53 insertions(+), 9 deletions(-)
 create mode 100644 SimpleIniConfig.cmake.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3fac8bf..bb03ab2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,8 @@ else()
 	set(IS_TOPLEVEL_PROJECT FALSE)
 endif()
 
+option(SIMPLEINI_USE_SYSTEM_GTEST "Use system GoogleTest dependency" OFF)
+
 # Disable in-source builds:
 get_filename_component(srcdir "${CMAKE_SOURCE_DIR}" REALPATH)
 get_filename_component(bindir "${CMAKE_BINARY_DIR}" REALPATH)
@@ -33,7 +35,37 @@ set(HEADERS SimpleIni.h)
 add_library(${PROJECT_NAME} INTERFACE)
 add_library(${EXPORT_NAMESPACE}${PROJECT_NAME} ALIAS ${PROJECT_NAME})
 
-target_include_directories(${PROJECT_NAME} INTERFACE .)
+include(GNUInstallDirs)
+
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+	VERSION ${PROJECT_VERSION}
+	COMPATIBILITY SameMajorVersion
+)
+configure_package_config_file(${PROJECT_NAME}Config.cmake.in
+	${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+	INSTALL_DESTINATION ${CMAKE_INSTALL_DATADIR}/cmake/${PROJECT_NAME}
+)
+
+install(FILES SimpleIni.h
+	DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}
+)
+
+install(TARGETS ${PROJECT_NAME}
+	EXPORT ${PROJECT_NAME}Targets
+)
+
+install(FILES
+		${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+		${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+	DESTINATION ${CMAKE_INSTALL_DATADIR}/cmake/${PROJECT_NAME}
+)
+install(EXPORT ${PROJECT_NAME}Targets
+	DESTINATION ${CMAKE_INSTALL_DATADIR}/cmake/${PROJECT_NAME}
+	NAMESPACE EXPORT_NAMESPACE
+)
+
+target_include_directories(${PROJECT_NAME} INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
 
 if(IS_TOPLEVEL_PROJECT)
 	enable_testing()
diff --git a/SimpleIniConfig.cmake.in b/SimpleIniConfig.cmake.in
new file mode 100644
index 0000000..8481e98
--- /dev/null
+++ b/SimpleIniConfig.cmake.in
@@ -0,0 +1,8 @@
+@PACKAGE_INIT@
+
+# prevent repeatedly including the targets
+if(NOT TARGET @PROJECT_NAME@::@PROJECT_NAME@)
+    include(${CMAKE_CURRENT_LIST_DIR}/SimpleIniTargets.cmake)
+endif()
+
+message(STATUS "Found @PROJECT_NAME@, version: ${@PROJECT_NAME@_VERSION}")
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 45caa17..48205f4 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,10 +1,14 @@
-include(FetchContent)
-FetchContent_Declare(
-	googletest
-	URL https://github.com/google/googletest/archive/refs/tags/v1.14.0.zip
-	URL_HASH SHA1=0ac421f2ec11af38b0fff0f1992184032731a8bc
-	DOWNLOAD_EXTRACT_TIMESTAMP ON)
-FetchContent_MakeAvailable(googletest)
+if(SIMPLEINI_USE_SYSTEM_GTEST)
+	find_package(GTest REQUIRED)
+else()
+	include(FetchContent)
+	FetchContent_Declare(
+		googletest
+		URL https://github.com/google/googletest/archive/refs/tags/v1.14.0.zip
+		URL_HASH SHA1=0ac421f2ec11af38b0fff0f1992184032731a8bc
+		DOWNLOAD_EXTRACT_TIMESTAMP ON)
+	FetchContent_MakeAvailable(googletest)
+endif()
 
 add_executable(tests
 	ts-bugfix.cpp
@@ -15,7 +19,7 @@ add_executable(tests
 	ts-utf8.cpp)
 
 add_test(NAME tests COMMAND tests)
-target_link_libraries(tests PRIVATE ${PROJECT_NAME} gtest_main)
+target_link_libraries(tests PRIVATE ${PROJECT_NAME} GTest::gtest_main)
 
 add_custom_command(
 	TARGET tests POST_BUILD