From f464ae84ce5b1acd355a43b37156fcab476ac3e7 Mon Sep 17 00:00:00 2001
From: Itamar <itamar8910@gmail.com>
Date: Fri, 7 Jan 2022 16:31:48 +0200
Subject: [PATCH] CMake: Add HACKSTUDIO_BUILD option for building from Hack
 Studio

If this option is set, we will not build all components.
Instead, we include an external CMake file passed in via a variable
named HACKSTUDIO_BUILD_CMAKE_FILE.

This will be used to build serenity components from Hack Studio.
---
 CMakeLists.txt                  | 35 ++++++++++++++++++++++-----------
 Meta/CMake/common_options.cmake |  2 ++
 2 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 728b1d69edd..db125297306 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,13 +47,17 @@ if(CCACHE_PROGRAM)
     set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE_PROGRAM}" CACHE FILEPATH "Path to a compiler launcher program, e.g. ccache")
 endif()
 
-# FIXME: With cmake 3.18, we can change unzip/untar steps to use
-#        file(ARCHIVE_EXTRACT) instead
-find_program(UNZIP unzip REQUIRED)
-find_program(TAR tar REQUIRED)
+if (NOT HACKSTUDIO_BUILD)
 
-# Host tools, required to generate files for the build
-find_package(Lagom CONFIG REQUIRED)
+    # FIXME: With cmake 3.18, we can change unzip/untar steps to use
+    #        file(  ARCHIVE_EXTRACT) instead
+    find_program(UNZIP unzip REQUIRED)
+    find_program(TAR tar REQUIRED)
+
+    # Host tools, required to generate files for the build
+    find_package(Lagom CONFIG REQUIRED)
+
+endif()
 
 # Meta target to run all code-gen steps in the build.
 add_custom_target(all_generated)
@@ -109,11 +113,15 @@ add_custom_target(install-ports
     USES_TERMINAL
 )
 
-add_custom_target(configure-components
-    COMMAND "$<TARGET_FILE:Lagom::ConfigureComponents>"
-    USES_TERMINAL
-)
-add_dependencies(configure-components Lagom::ConfigureComponents)
+if (NOT HACKSTUDIO_BUILD)
+
+    add_custom_target(configure-components
+        COMMAND "$<TARGET_FILE:Lagom::ConfigureComponents>"
+        USES_TERMINAL
+    )
+    add_dependencies(configure-components Lagom::ConfigureComponents)
+
+endif()
 
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -251,6 +259,11 @@ serenity_component(
     RECOMMENDED
 )
 
+if (HACKSTUDIO_BUILD)
+    include(${HACKSTUDIO_BUILD_CMAKE_FILE})
+    return()
+endif()
+
 add_subdirectory(AK)
 add_subdirectory(Kernel)
 if(NOT "${SERENITY_ARCH}" STREQUAL "aarch64")
diff --git a/Meta/CMake/common_options.cmake b/Meta/CMake/common_options.cmake
index 3a1f9ef409a..eb516be7fc9 100644
--- a/Meta/CMake/common_options.cmake
+++ b/Meta/CMake/common_options.cmake
@@ -12,3 +12,5 @@ serenity_option(ENABLE_COMPILETIME_HEADER_CHECK OFF CACHE BOOL "Enable compileti
 serenity_option(ENABLE_TIME_ZONE_DATABASE_DOWNLOAD ON CACHE BOOL "Enable download of the IANA Time Zone Database at build time")
 serenity_option(ENABLE_UNICODE_DATABASE_DOWNLOAD ON CACHE BOOL "Enable download of Unicode UCD and CLDR files at build time")
 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")