CMake: Add features for docs, unit tests

- A new CMake option, ENABLE_TESTS, is created and defaults ON
  (Legacy -DDISABLE_TESTS=1 on the command line will override)
- Target info for docs and tests is shown in the FeatureSummary

CMakeLists.txt

@@ -73,9 +73,14 @@ include(FeatureSummary)
 # Optional build settings for libopenshot
 option(USE_SYSTEM_JSONCPP "Use system installed JsonCpp, if found" ON)
 option(DISABLE_BUNDLED_JSONCPP "Don't fall back to bundled JsonCpp" OFF)
-option(DISABLE_TESTS "Don't build unit tests" OFF)
 option(ENABLE_IWYU "Enable 'Include What You Use' scanner (CMake 3.3+)" OFF)
-option(ENABLE_COVERAGE "Enable coverage reporting" OFF)
+option(ENABLE_TESTS "Build unit tests (requires UnitTest++)" ON)
+option(ENABLE_DOCS "Build API documentation (requires Doxygen)" ON)
+
+# Legacy commandline override
+if (DISABLE_TESTS)
+  set(ENABLE_TESTS OFF CACHE BOOL "Build unit tests (requires UnitTest++)" FORCE)
+endif()
 
 ########## Configure Version.h header ##############
 configure_file(include/OpenShotVersion.h.in include/OpenShotVersion.h @ONLY)
@@ -124,27 +129,32 @@ add_subdirectory(src)
 
 ################### DOCUMENTATION ###################
 # Find Doxygen (used for documentation)
-include(cmake/Modules/UseDoxygen.cmake)
-
-# Doxygen was found
-if (TARGET doc)
-	message(STATUS "Doxygen found, documentation target enabled")
-	message("\nTo compile documentation in doc/html, run: 'make doc'")
-
-  # Install docs, if the user builds them with `make doc`
-  install(CODE "MESSAGE(\"Checking for documentation files to install...\")")
-  install(CODE "MESSAGE(\"(Compile with 'make doc' command, requires Doxygen)\")")
-
-  install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/doc/html/
-          DESTINATION ${CMAKE_INSTALL_DOCDIR}/API
-          MESSAGE_NEVER # Don't spew about file copies
-          OPTIONAL )    # No error if the docs aren't found
+set(DOCS_ENABLED FALSE) # Only set true if Doxygen is found and configured
+if (ENABLE_DOCS)
+  include(cmake/Modules/UseDoxygen.cmake)
+
+  # Doxygen was found
+  if (TARGET doc)
+  	message(STATUS "Doxygen found, documentation target enabled")
+  	set(DOCS_ENABLED TRUE)
+
+    # Install docs, if the user builds them with `make doc`
+    install(CODE "MESSAGE(\"Checking for documentation files to install...\")")
+    install(CODE "MESSAGE(\"(Compile with 'make doc' command, requires Doxygen)\")")
+
+    install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/doc/html/
+            DESTINATION ${CMAKE_INSTALL_DOCDIR}/API
+            MESSAGE_NEVER # Don't spew about file copies
+            OPTIONAL )    # No error if the docs aren't found
+  endif()
 endif()
+add_feature_info("Documentation" DOCS_ENABLED "Build API documentation with 'make doc'")
 
 ############# PROCESS tests/ DIRECTORY ##############
-if(NOT DISABLE_TESTS)
+if(ENABLE_TESTS)
   add_subdirectory(tests)
 endif()
+add_feature_info("Unit tests" ENABLE_TESTS "Compile unit tests for library functions")
 
 ############## COVERAGE REPORTING #################
 if (ENABLE_COVERAGE)

tests/CMakeLists.txt

@@ -125,7 +125,6 @@ target_link_libraries(openshot-test openshot ${UNITTEST++_LIBRARY})
 ##### RUNNING TESTS (make os_test / make test) #####
 # Hook up the 'make os_test' target to the 'openshot-test' executable
 ADD_CUSTOM_TARGET(os_test COMMAND openshot-test)
-list(APPEND OS_TEST_CMDS "'make os_test'")
 
 # Also hook up 'make test', if possible
 # This requires CMake 3.11+, where the CMP0037 policy
@@ -137,8 +136,8 @@ endif()
 if (CMAKE_VERSION VERSION_GREATER 3.11)
 	message(STATUS "Cmake 3.11+ detected, enabling 'test' target")
 	add_custom_target(test COMMAND openshot-test)
-	list(APPEND OS_TEST_CMDS " or " "'make test'")
+	set(TEST_TARGET_NAME "test")
+else()
+  set(TEST_TARGET_NAME "os_test")
 endif()
-
-string(CONCAT t ${OS_TEST_CMDS})
-message("\nTo run unit tests, use: ${t}")
+add_feature_info("Testrunner" ENABLE_TESTS "Run unit tests with 'make ${TEST_TARGET_NAME}'")