Add install procedure to CMake and make finding tests optional

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.22)
 option(ENABLE_SQLCIPHER_TESTS "enable sqlchipher test")
 
 # Creates the file compile_commands.json in the build directory.
@@ -7,6 +7,13 @@ set(CMAKE_CXX_STANDARD 17)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
 set(HUNTER_TLS_VERIFY ON)
+
+option(HUNTER_ENABLED "Enable Hunter package manager support" ON)
+
+set(IS_MAIN_FILE CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+option(BUILD_TESTING "Enable build of tests" IS_MAIN_FILE)
+option(ENABLE_INSTALL "Enable the installation of the library" "NOT IS_MAIN_FILE")
+
 include("cmake/HunterGate.cmake")
 include("cmake/Catch.cmake")
 
@@ -15,42 +22,70 @@ HunterGate(
     SHA1 "8010d63d5ae611c564889d5fe12d3cb7a45703ac"
 )
 
-project(SqliteModernCpp)
+project(SQLiteModernCpp LANGUAGES CXX)
 
-hunter_add_package(Catch)
 hunter_add_package(sqlite3)
-
-find_package(Catch2 CONFIG REQUIRED)
 find_package(sqlite3 CONFIG REQUIRED)
 
-set(TEST_SOURCE_DIR             ${CMAKE_CURRENT_SOURCE_DIR}/tests)
-file(GLOB TEST_SOURCES          ${TEST_SOURCE_DIR}/*.cc)
+add_library(SQLiteModernCpp INTERFACE)
 
-IF(NOT ENABLE_SQLCIPHER_TESTS)
-    list(REMOVE_ITEM TEST_SOURCES ${TEST_SOURCE_DIR}/sqlcipher.cc)
-ENDIF(NOT ENABLE_SQLCIPHER_TESTS)
+target_include_directories(SQLiteModernCpp INTERFACE
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/hdr>
+)
+
+include(GNUInstallDirs)
 
-enable_testing()
+if(ENABLE_INSTALL)
+    install(
+        TARGETS SQLiteModernCpp
+        EXPORT SQLiteModernCppConfig
+        INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+    )
 
-add_library (sqlite_modern_cpp INTERFACE)
-target_include_directories(sqlite_modern_cpp INTERFACE hdr/)
+    install(
+        EXPORT SQLiteModernCppConfig
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/SQLiteModernCpp"
+        NAMESPACE SQLiteModernCpp::
+    )
 
-add_executable(tests_runner ${TEST_SOURCES})
-target_include_directories(tests_runner INTERFACE ${SQLITE3_INCLUDE_DIRS})
-if(ENABLE_SQLCIPHER_TESTS)
-    target_link_libraries(tests_runner Catch2::Catch2 sqlite_modern_cpp sqlite3::sqlite3 -lsqlcipher)
-else()
-    target_link_libraries(tests_runner Catch2::Catch2 sqlite_modern_cpp sqlite3::sqlite3)
+    install(
+        DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/hdr/
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+    )
 endif()
 
-catch_discover_tests(tests_runner)
-target_compile_options(tests_runner PUBLIC $<$<CXX_COMPILER_ID:MSVC>:/Zc:__cplusplus> )
+if(BUILD_TESTING)
+    hunter_add_package(Catch)
+    find_package(Catch2 CONFIG REQUIRED)
+
+    set(TEST_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/tests)
+    file(GLOB TEST_SOURCES ${TEST_SOURCE_DIR}/*.cc)
+
+    IF(NOT ENABLE_SQLCIPHER_TESTS)
+        list(REMOVE_ITEM TEST_SOURCES ${TEST_SOURCE_DIR}/sqlcipher.cc)
+    ENDIF(NOT ENABLE_SQLCIPHER_TESTS)
+
+    enable_testing()
+
+    add_executable(tests_runner ${TEST_SOURCES})
+    target_include_directories(tests_runner INTERFACE ${SQLITE3_INCLUDE_DIRS})
+
+    if(ENABLE_SQLCIPHER_TESTS)
+        target_link_libraries(tests_runner Catch2::Catch2 sqlite_modern_cpp sqlite3::sqlite3 -lsqlcipher)
+    else()
+        target_link_libraries(tests_runner Catch2::Catch2 sqlite_modern_cpp sqlite3::sqlite3)
+    endif()
+
+    catch_discover_tests(tests_runner)
+
+    target_compile_options(tests_runner PUBLIC $<$<CXX_COMPILER_ID:MSVC>:/Zc:__cplusplus>)
+endif()
 
 # Place the file in the source directory, permitting us to place a single configuration file for YCM there.
 # YCM is the code-completion engine for (neo)vim https://github.com/Valloric/YouCompleteMe
 IF(EXISTS "${CMAKE_BINARY_DIR}/compile_commands.json")
-  EXECUTE_PROCESS( COMMAND ${CMAKE_COMMAND} -E copy_if_different
-    ${CMAKE_BINARY_DIR}/compile_commands.json
-    ${CMAKE_SOURCE_DIR}/compile_commands.json
-  )
-ENDIF()
+    EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_BINARY_DIR}/compile_commands.json
+        ${CMAKE_SOURCE_DIR}/compile_commands.json
+    )
+ENDIF()

cmake/HunterGate.cmake

@@ -42,7 +42,6 @@
 #     * https://github.com/hunter-packages/gate/
 #     * https://github.com/ruslo/hunter
 
-option(HUNTER_ENABLED "Enable Hunter package manager support" ON)
 if(HUNTER_ENABLED)
   if(CMAKE_VERSION VERSION_LESS "3.0")
     message(FATAL_ERROR "At least CMake version 3.0 required for hunter dependency management."