Add CMake and tests

- Port tests to GitLab
- Add GitLab CI test matrix
- Remove gtest submodule

cmake/FindDkToolScripts.cmake

@@ -0,0 +1,88 @@
+# Recommendation: Place this file in source control.
+# Auto-generated by `./dk dksdk.project.new` of DkHelloWorld.
+
+include(FetchContent)
+
+function(parse_dktool_command_line)
+    # The first argument is <command>. All dots will be replaced with a
+    # triple underscore as a convenience and to be pretty for the user.
+    if(ARGC EQUAL 0)
+        message(FATAL_ERROR "Missing <command>. Usage: ./dk <command> [args]")
+    endif()
+    set(command ${ARGV0})
+    string(REPLACE "." "___" function_name ${command})
+
+    # Set policies (we are in a new EVAL CODE context)
+    #   Included scripts do automatic cmake_policy PUSH and POP
+    if(POLICY CMP0011)
+        cmake_policy(SET CMP0011 NEW)
+    endif()
+
+    # Setup the binary directory
+    if(NOT DKTOOL_WORKDIR)
+        message(FATAL_ERROR "Illegal state. Expecting DKTOOL_WORKDIR")
+    endif()
+    set(CMAKE_BINARY_DIR ${DKTOOL_WORKDIR})
+    set(CMAKE_CURRENT_BINARY_DIR  ${CMAKE_BINARY_DIR})
+
+    # Include all the user scripts
+    file(GLOB_RECURSE command_files LIST_DIRECTORIES FALSE
+            cmake/scripts/*.cmake)
+    foreach(command_file IN LISTS command_files)
+        include(${command_file})
+    endforeach()
+
+    # Include all the system scripts.
+    # - Since the system scripts come after the user scripts, the user scripts
+    #   don't override the system scripts unless the user scripts use deferred
+    #   hooks or redefine CMake built-in functions.
+    if(NOT IS_DIRECTORY cmake/scripts/dksdk)
+        # If this project (ex. DkHelloWorld) has the system scripts, it must
+        # have all of them. Otherwise we download the system scripts.
+        FetchContent_Populate(DkHelloWorld
+            QUIET
+            GIT_REPOSITORY https://gitlab.com/diskuv/samples/DkHelloWorld.git
+            GIT_TAG 1.0
+        )
+        file(GLOB_RECURSE system_command_files LIST_DIRECTORIES FALSE
+                ${dkhelloworld_SOURCE_DIR}/cmake/scripts/dksdk/*.cmake)
+        list(APPEND command_files ${system_command_files})
+        foreach(command_file IN LISTS system_command_files)
+            include(${command_file})
+        endforeach()
+    endif()
+
+    # Validate the <command> exists
+    if(NOT COMMAND ${function_name})
+        set(pretty_command_files ${command_files})
+        list(TRANSFORM pretty_command_files PREPEND "  ")
+        list(TRANSFORM pretty_command_files APPEND "\n")
+        string(JOIN "" str_pretty_command_files ${pretty_command_files})
+        message(FATAL_ERROR "No command '${command}' exists. The function '${function_name}' was searched in the following locations:
+${str_pretty_command_files}")
+    endif()
+
+    # Parse the remainder of the arguments [args]
+    # * Use technique from [Professional CMake: A Practical Guide - Forwarding Command Arguments]
+    #   to forward arguments correctly to an inner function (the <command> function).
+    cmake_parse_arguments(PARSE_ARGV 1 FWD "" "" "")
+    set(quotedArgs "")
+    foreach(arg IN LISTS FWD_UNPARSED_ARGUMENTS)
+        string(APPEND quotedArgs " [===[${arg}]===]")
+    endforeach()
+
+    # Call the <command> function
+    cmake_language(EVAL CODE "${function_name}(${quotedArgs})")
+endfunction()
+
+# DkSDK data home
+if(WIN32)
+    set(DKSDK_DATA_HOME "$ENV{LOCALAPPDATA}/Programs/DkSDK")
+elseif(DEFINED ENV{XDG_DATA_HOME})
+    set(DKSDK_DATA_HOME "$ENV{XDG_DATA_HOME}/dksdk")
+else()
+    set(DKSDK_DATA_HOME "$ENV{HOME}/.local/share/dksdk")
+endif()
+
+# Splat DKTOOL_CMDLINE
+cmake_language(EVAL CODE "parse_dktool_command_line(${DKTOOL_CMDLINE})")