add files for windows

Author: cxxxr

.github/workflows/build-windows.yml

@@ -0,0 +1,58 @@
+name: Build Windows DLL (lib/windows/x64)
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - ".github/workflows/build-windows.yml"
+      - "c/windows/**"
+
+permissions:
+  contents: write
+
+jobs:
+  win-x64:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up MSVC env
+        uses: ilammy/msvc-dev-cmd@v1
+        with:
+          arch: x64
+
+      - name: Configure (CMake, x64, Release)
+        run: >
+          cmake
+          -S c/windows
+          -B build
+          -G "Visual Studio 17 2022"
+          -A x64
+          -D CMAKE_BUILD_TYPE=Release
+
+      - name: Build
+        run: cmake --build build --config Release --parallel
+
+      - name: Prepare lib/windows/x64
+        shell: pwsh
+        run: |
+          New-Item -ItemType Directory -Path lib/windows/x64 -Force | Out-Null
+          Copy-Item build/bin/Release/webview.dll lib/windows/x64/
+          if (Test-Path build/lib/Release/webview.lib) {
+            Copy-Item build/lib/Release/webview.lib lib/windows/x64/
+          } elseif (Test-Path build/bin/Release/webview.lib) {
+            Copy-Item build/bin/Release/webview.lib lib/windows/x64/
+          }
+          if (Test-Path build/bin/Release/webview.pdb) {
+            Copy-Item build/bin/Release/webview.pdb lib/windows/x64/
+          }
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: webview-windows-x64
+          path: lib/windows/x64/

c/windows/CMakeLists.txt

@@ -0,0 +1,51 @@
+cmake_minimum_required(VERSION 3.20)
+project(cl-webview-win LANGUAGES C CXX)
+
+# x64 前提
+if (NOT MSVC OR NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
+  message(FATAL_ERROR "This build expects MSVC on 64-bit (x64) Windows.")
+endif()
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+
+include(FetchContent)
+# 上流 webview を取得（必要に応じてタグ固定）
+FetchContent_Declare(
+  webview
+  GIT_REPOSITORY https://github.com/webview/webview
+  GIT_TAG        0.12.0
+)
+FetchContent_MakeAvailable(webview)
+
+# C API を DLL 化（CFFI からロードする想定）
+add_library(webview SHARED)
+
+# 上流の C API 実装（パスは上流リポ構成に追従）
+target_sources(webview PRIVATE
+  ${webview_SOURCE_DIR}/webview/webview_capi.cpp
+)
+
+# 上流のコアにリンク
+target_link_libraries(webview PRIVATE webview::core)
+
+# 必要に応じて DLL 名を固定したい場合は有効化
+# set_target_properties(webview PROPERTIES OUTPUT_NAME "libwebview")
+
+# 出力先
+set_target_properties(webview PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
+  ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
+  LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
+)
+
+if (MSVC)
+  target_compile_definitions(webview PRIVATE -DUNICODE -D_UNICODE)
+  # 静的ランタイム (/MT) にしたい場合は以下を有効化
+  # foreach(flag_var  CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS_RELEASE)
+  #   string(REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
+  # endforeach()
+endif()
+
+target_compile_definitions(webview PRIVATE WEBVIEW_LISP_BINDING=1)