Added install procedure in CMake

Author: EduMenges

CMakeLists.txt

@@ -12,6 +12,7 @@ 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")
@@ -26,6 +27,32 @@ project(SQLiteModernCpp LANGUAGES CXX)
 hunter_add_package(sqlite3)
 find_package(sqlite3 CONFIG REQUIRED)
 
+add_library(SQLiteModernCpp INTERFACE)
+
+target_include_directories(SQLiteModernCpp INTERFACE
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/hdr>
+)
+
+include(GNUInstallDirs)
+
+if(ENABLE_INSTALL)
+    install(
+        TARGETS SQLiteModernCpp
+        EXPORT SQLiteModernCppConfig
+        INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+    )
+
+    install(
+        EXPORT SQLiteModernCppConfig
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/SQLiteModernCpp"
+        NAMESPACE SQLiteModernCpp::
+    )
+
+    install(
+        DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/hdr/
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+    )
+endif()
 
 if(BUILD_TESTING)
     hunter_add_package(Catch)
@@ -34,22 +61,22 @@ if(BUILD_TESTING)
     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)
+    IF(NOT ENABLE_SQLCIPHER_TESTS)
+        list(REMOVE_ITEM TEST_SOURCES ${TEST_SOURCE_DIR}/sqlcipher.cc)
+    ENDIF(NOT ENABLE_SQLCIPHER_TESTS)
 
-enable_testing()
+    enable_testing()
 
-add_executable(tests_runner ${TEST_SOURCES})
-target_include_directories(tests_runner INTERFACE ${SQLITE3_INCLUDE_DIRS})
+    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()
+    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)
+    catch_discover_tests(tests_runner)
 
     target_compile_options(tests_runner PUBLIC $<$<CXX_COMPILER_ID:MSVC>:/Zc:__cplusplus>)
 endif()
@@ -58,7 +85,7 @@ endif()
 # 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
-  )
+        ${CMAKE_BINARY_DIR}/compile_commands.json
+        ${CMAKE_SOURCE_DIR}/compile_commands.json
+    )
 ENDIF()