Meta+Userland: Add jakt as an optional Lagom Tool

We can now use ENABLE_JAKT to pull jakt as a host tool and use it to
pre-process .jakt files into .cpp files for use in serenity applications

Meta/CMake/code_generators.cmake

@@ -62,3 +62,25 @@ function(generate_state_machine source header)
         add_dependencies(all_generated ${target_name})
     endif()
 endfunction()
+
+function(compile_jakt source)
+    set(source ${CMAKE_CURRENT_SOURCE_DIR}/${source})
+    get_filename_component(source_base ${source} NAME_WE)
+    set(output "${source_base}.cpp")
+    add_custom_command(
+        OUTPUT ${output}
+        COMMAND $<TARGET_FILE:Lagom::jakt> -o "${CMAKE_CURRENT_BINARY_DIR}/jakt_tmp" ${source}
+        COMMAND "${CMAKE_COMMAND}" -E copy_if_different "${CMAKE_CURRENT_BINARY_DIR}/jakt_tmp/${output}" ${output}
+        COMMAND "${CMAKE_COMMAND}" -E remove "${CMAKE_CURRENT_BINARY_DIR}/jakt_tmp/${output}"
+        VERBATIM
+        DEPENDS Lagom::jakt
+        MAIN_DEPENDENCY ${source}
+    )
+    get_property(JAKT_INCLUDE_DIR TARGET Lagom::jakt PROPERTY IMPORTED_INCLUDE_DIRECTORIES)
+    set_source_files_properties("${output}" PROPERTIES
+        INCLUDE_DIRECTORIES "${JAKT_INCLUDE_DIR};${JAKT_INCLUDE_DIR}/runtime"
+        COMPILE_FLAGS "-Wno-unused-local-typedefs")
+    get_filename_component(output_name ${output} NAME)
+    add_custom_target(generate_${output_name} DEPENDS ${output})
+    add_dependencies(all_generated generate_${output_name})
+endfunction()

Meta/CMake/common_options.cmake

@@ -14,3 +14,6 @@ serenity_option(ENABLE_UNICODE_DATABASE_DOWNLOAD ON CACHE BOOL "Enable download
 serenity_option(INCLUDE_WASM_SPEC_TESTS OFF CACHE BOOL "Download and include the WebAssembly spec testsuite")
 
 serenity_option(HACKSTUDIO_BUILD OFF CACHE BOOL "Automatically enabled when building from HackStudio")
+
+serenity_option(ENABLE_JAKT OFF CACHE BOOL "Enable building jakt files")
+serenity_option(JAKT_SOURCE_DIR "" CACHE STRING "Pre-existing jakt language source directory")

Meta/CMake/jakt.cmake

@@ -0,0 +1,39 @@
+#
+# Builds the jakt bootstrap compiler as a host tool for Lagom to compile files written in jakt
+#
+
+include(FetchContent)
+
+FetchContent_Declare(
+  Corrosion
+  GIT_REPOSITORY https://github.com/corrosion-rs/corrosion.git
+  GIT_TAG v0.2.1
+)
+
+FetchContent_MakeAvailable(Corrosion)
+
+FetchContent_Declare(jakt
+    GIT_REPOSITORY https://github.com/SerenityOS/jakt.git
+    GIT_TAG main
+    GIT_SHALLOW TRUE
+)
+
+# Allow developers to skip download/update steps with local checkout
+if (JAKT_SOURCE_DIR)
+    set(FETCHCONTENT_SOURCE_DIR_JAKT ${JAKT_SOURCE_DIR} CACHE PATH "Developer's pre-existing jakt source directory" FORCE)
+    message(STATUS "Using pre-existing JAKT_SOURCE_DIR: ${JAKT_SOURCE_DIR}")
+endif()
+
+FetchContent_GetProperties(jakt)
+if (NOT jakt_POPULATED)
+    FetchContent_Populate(jakt)
+    corrosion_import_crate(MANIFEST_PATH "${jakt_SOURCE_DIR}/Cargo.toml")
+    corrosion_set_hostbuild(jakt)
+    add_executable(Lagom::jakt ALIAS jakt)
+    corrosion_install(TARGETS jakt RUNTIME COMPONENT Lagom_Runtime)
+    # NOTE: See lagom-install-config.cmake for hax required to get Lagom::jakt to show up on install
+    install(DIRECTORY "${jakt_SOURCE_DIR}/runtime"
+            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/jakt
+            FILES_MATCHING PATTERN "*.h"
+                           PATTERN "*.cpp")
+endif()

Meta/CMake/lagom-install-config.cmake

@@ -1 +0,0 @@
-include("${CMAKE_CURRENT_LIST_DIR}/LagomTargets.cmake")

Meta/CMake/lagom-install-config.cmake.in

@@ -0,0 +1,31 @@
+include("${CMAKE_CURRENT_LIST_DIR}/LagomTargets.cmake")
+
+if (@ENABLE_JAKT@)
+    # FIXME: corrosion does not support corrosion_install(TARGETS  <targets>... EXPORT <export-name>)
+    #        Instead, hack up the magic sauce using the imported location of IPCCompiler
+
+    # Create imported target Lagom::jakt
+    add_executable(Lagom::jakt IMPORTED)
+
+    # Figure out where the binary directory of the install tree is
+    get_property(_IMPORTED_BINDIR
+        TARGET Lagom::IPCCompiler
+        PROPERTY LOCATION
+    )
+    get_filename_component(_IMPORTED_BINDIR "${_IMPORTED_BINDIR}" DIRECTORY)
+    get_filename_component(_IMPORTED_INCLUDEDIR "${_IMPORTED_BINDIR}" DIRECTORY)
+    set(_IMPORTED_INCLUDEDIR "${_IMPORTED_INCLUDEDIR}/include")
+
+    # Set the imported location of the tool
+    set_target_properties(Lagom::jakt PROPERTIES
+        IMPORTED_LOCATION "${_IMPORTED_BINDIR}/jakt"
+        IMPORTED_INCLUDE_DIRECTORIES "${_IMPORTED_INCLUDEDIR}/jakt"
+    )
+
+    if (NOT EXISTS "${_IMPORTED_BINDIR}/jakt")
+        message(FATAL_ERROR "The imported target \"jakt\" references the file \"${_IMPORTED_BINDIR}/jakt\" but this file does not exist.")
+    endif()
+
+    unset(_IMPORTED_BINDIR)
+    unset(_IMPORTED_INCLUDEDIR)
+endif()

Meta/Lagom/CMakeLists.txt

@@ -147,10 +147,10 @@ set(Lagom_INSTALL_CMAKEDIR "${CMAKE_INSTALL_DATADIR}/${package}"
     CACHE PATH "CMake package config location relative to the install prefix")
 mark_as_advanced(Lagom_INSTALL_CMAKEDIR)
 
+configure_file("${SERENITY_PROJECT_ROOT}/Meta/CMake/lagom-install-config.cmake.in" "${package}Config.cmake" @ONLY)
 install(
-    FILES "${SERENITY_PROJECT_ROOT}/Meta/CMake/lagom-install-config.cmake"
+    FILES "${CMAKE_CURRENT_BINARY_DIR}/${package}Config.cmake"
     DESTINATION "${Lagom_INSTALL_CMAKEDIR}"
-    RENAME "${package}Config.cmake"
     COMPONENT Lagom_Development
 )
 

Meta/Lagom/Tools/CMakeLists.txt

@@ -14,3 +14,7 @@ endfunction()
 add_subdirectory(CodeGenerators)
 add_subdirectory(ConfigureComponents)
 add_subdirectory(IPCMagicLinter)
+
+if (ENABLE_JAKT)
+    include(jakt)
+endif()