From 9b1eb1e1675cb4abe5b2232e11593738beef69e6 Mon Sep 17 00:00:00 2001
From: Galarius <galarius.is@gmail.com>
Date: Mon, 28 Aug 2023 19:57:41 +0300
Subject: [PATCH] Add libclang caching

---
 .github/workflows/build.yml | 12 ++++++++---
 libclang/CMakeLists.txt     | 41 +++++++++++++++++++++++++------------
 libclang/libclang-urls.txt  |  3 +++
 3 files changed, 40 insertions(+), 16 deletions(-)
 create mode 100644 libclang/libclang-urls.txt

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bba2d2d..25b020a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -61,6 +61,15 @@ jobs:
       run: |
         python3 build.py conan-install --with-tests
     
+    - name: Cache libclang
+      id: cache-libclang
+      uses: actions/cache@v3
+      env:
+        cache-name: cache-libclang
+      with:
+        path: .build/_deps/libclang-subbuild/libclang-populate-prefix/src/*.7z
+        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('libclang/libclang-urls.txt') }}
+
     - name: Configure
       run: |
         python3 build.py configure --with-tests
@@ -73,6 +82,3 @@ jobs:
       run: |
         cd .build
         ctest --verbose --output-on-failure
-
-# TODO: cache prebuilt libraries like in 
-# https://github.com/cristianadam/qt5/blob/eb958d8c1a9d22ebc94502fc30d56e77dbebb580/.github/workflows/qmake_build.yml#L83
\ No newline at end of file
diff --git a/libclang/CMakeLists.txt b/libclang/CMakeLists.txt
index 2c0f43b..966628b 100644
--- a/libclang/CMakeLists.txt
+++ b/libclang/CMakeLists.txt
@@ -24,27 +24,42 @@ if(DEFINED LLVM_ROOT_DIR AND NOT LLVM_ROOT_DIR STREQUAL "")
 else()
 
   # Download prebuilt static llvm & clang libraries
-
   include(FetchContent)
   set(FETCHCONTENT_QUIET OFF)
 
-  if(APPLE)
-    set(LIBCLANG_URL "https://download.qt.io/development_releases/prebuilt/libclang/qt/libclang-release_15.0.0-based-mac.7z")
-    set(LIBCLANG_HASH "8a944b4b65d2dca883fe539af5e5eef9a67e2abca91b28258fb08c46e3bb05b6")
-  elseif(WIN32)
-    set(LIBCLANG_URL "https://download.qt.io/development_releases/prebuilt/libclang/qt/libclang-release_15.0.0-based-windows-vs2019_64.7z")
-    set(LIBCLANG_HASH "3cd73b31be503ec7281f1f8907f95392d1c8bd0a8c2c92c39dc177f8c3d02baf")
-  else()
-    set(LIBCLANG_URL "https://download.qt.io/development_releases/prebuilt/libclang/qt/libclang-release_15.0.0-based-linux-Ubuntu20.04-gcc9.3-x86_64.7z")
-    set(LIBCLANG_HASH "0cfdf3387b8917e99fbd81358a142daeb3bcb84c107c96f1508f257ee2082bda")
-  endif()
+  file(STRINGS ${CMAKE_CURRENT_SOURCE_DIR}/libclang-urls.txt libclang_entries)
+
+  message(STATUS "Parsing ${CMAKE_CURRENT_SOURCE_DIR}/libclang-urls.txt...")
+  foreach(entry ${libclang_entries})
+    # Parse platform, URL, and hash
+    list(GET entry 0 platform)
+    list(GET entry 1 url_value)
+    list(GET entry 2 hash_value)
+
+    if(platform STREQUAL "APPLE" AND APPLE)
+      set(libclang_url ${url_value})
+      set(libclang_hash ${hash_value})
+      break()
+    elseif(platform STREQUAL "WIN32" AND WIN32)
+      set(libclang_url ${url_value})
+      set(libclang_hash ${hash_value})
+      break()
+    elseif(platform STREQUAL "LINUX" AND LINUX)
+      set(libclang_url ${url_value})
+      set(libclang_hash ${hash_value})
+      break()
+    endif()
+  endforeach()
+
+  message(STATUS "LIBCLANG URL: ${libclang_url}")
+  message(STATUS "LIBCLANG HASH: ${libclang_hash}")
 
   FetchContent_Declare(libclang
       SOURCE_DIR prebuild
       DOWNLOAD_EXTRACT_TIMESTAMP TRUE
       TLS_VERIFY TRUE
-      URL ${LIBCLANG_URL}
-      URL_HASH SHA256=${LIBCLANG_HASH}
+      URL ${libclang_url}
+      URL_HASH SHA256=${libclang_hash}
     )
     FetchContent_MakeAvailable(libclang)
     set(LLVM_ROOT_DIR ${libclang_SOURCE_DIR})
diff --git a/libclang/libclang-urls.txt b/libclang/libclang-urls.txt
new file mode 100644
index 0000000..fdaf7cf
--- /dev/null
+++ b/libclang/libclang-urls.txt
@@ -0,0 +1,3 @@
+APPLE;https://download.qt.io/development_releases/prebuilt/libclang/qt/libclang-release_15.0.0-based-mac.7z;8a944b4b65d2dca883fe539af5e5eef9a67e2abca91b28258fb08c46e3bb05b6
+WIN32;https://download.qt.io/development_releases/prebuilt/libclang/qt/libclang-release_15.0.0-based-windows-vs2019_64.7z;3cd73b31be503ec7281f1f8907f95392d1c8bd0a8c2c92c39dc177f8c3d02baf
+LINUX;https://download.qt.io/development_releases/prebuilt/libclang/qt/libclang-release_15.0.0-based-linux-Ubuntu20.04-gcc9.3-x86_64.7z;0cfdf3387b8917e99fbd81358a142daeb3bcb84c107c96f1508f257ee2082bda