Native Windows support (#102)

This pull request introduces support for native Windows by adding Windows-specific implementations and conditional compilation to various parts of the codebase. The changes ensure compatibility with Windows systems while maintaining functionality on other platforms.

### Build System Updates:
* Added a Windows runner (`windows-latest`) to the GitHub Actions workflow in `.github/workflows/cmake.yml`. Updated CMake configuration, build, and test steps to handle Windows-specific paths and commands.

### Codebase Updates for Windows Compatibility:
* **CMake Adjustments**: Introduced conditional flags for MSVC in `cmake/CXXSniffer.cmake` to set appropriate compiler flags for Windows (`/W4`) versus other platforms (`-Wall -Wextra`).
* **Datetime Handling**: Updated `Datetime::timegm` in `src/Datetime.cpp` to use `_putenv_s` and `_tzset` for setting the time zone on Windows. [[1]](diffhunk://#diff-87bf33523de4b0db7b37702262674dbf849e9f79686761c334c1cd04412b295eR3127-R3136) [[2]](diffhunk://#diff-87bf33523de4b0db7b37702262674dbf849e9f79686761c334c1cd04412b295eR3145)

### Filesystem (`FS.cpp`) Enhancements:
* **Platform-Specific Includes and Macros**: Added Windows-specific headers and macros for filesystem operations, such as `_mkdir`, `_unlink`, and `FlushFileBuffers`. [[1]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR37-L45) [[2]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR74-R83)
* **Path Operations**: Implemented Windows-specific logic for `Path::realpath`, `Path::expand`, and `Path::glob` to handle Windows paths and environment variables like `USERPROFILE`. [[1]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR181-R211) [[2]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR358-R388) [[3]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR426) [[4]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR437-R441)
* **File and Directory Operations**: Added Windows-compatible implementations for file creation, removal, locking, unlocking, truncating, and directory operations like `create` and `remove_directory`. [[1]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR509-R511) [[2]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR522-R526) [[3]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR773-R779) [[4]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR1049-R1053) [[5]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR1065) [[6]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR1212) [[7]](diffhunk://#diff-46a62fa5a3343b36a9aae12dd7292196103643bcbee4e56901c9ed12ee8f87abR1251-R1275)

### Header File Updates:
* Updated `src/FS.h` to include Windows-specific headers and define `mode_t` for compatibility.

These changes collectively enable the codebase to function seamlessly on Windows platforms while preserving its behavior on Unix-like systems.

Author: mekwall

.github/workflows/cmake.yml

@@ -22,20 +22,40 @@ jobs:
             runner: macos-14
           - name: "macOS 13"
             runner: macos-13
+          - name: "Windows"
+            runner: windows-latest
     runs-on: ${{ matrix.runner }}
 
     steps:
-    - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
 
-    # Configure in-source build and tests
-    - name: Configure CMake
-      run: cmake -S . -B . -DCMAKE_BUILD_TYPE=${BUILD_TYPE}
+      # Configure in-source build and tests
+      - name: Configure CMake
+        shell: bash
+        run: |
+          if [ "$RUNNER_OS" = "Windows" ]; then
+            cmake -S . -B build -DCMAKE_BUILD_TYPE=${BUILD_TYPE}
+          else
+            cmake -S . -B . -DCMAKE_BUILD_TYPE=${BUILD_TYPE}
+          fi
 
-    - name: Build project
-      run: cmake --build .
+      - name: Build project
+        shell: bash
+        run: |
+          if [ "$RUNNER_OS" = "Windows" ]; then
+            cmake --build build
+          else
+            cmake --build .
+          fi
 
-    - name: Test project
-      run: make test
+      - name: Test project
+        shell: bash
+        run: |
+          if [ "$RUNNER_OS" = "Windows" ]; then
+            cd build && ctest --output-on-failure
+          else
+            make test
+          fi
 
   integration-test:
     needs: build

cmake/CXXSniffer.cmake

@@ -25,4 +25,8 @@ else (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
   set (UNKNOWN true)
 endif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
 
-set (CMAKE_CXX_FLAGS "-Wall -Wextra -Wsign-compare -Wreturn-type ${CMAKE_CXX_FLAGS}")
+if (NOT MSVC)
+  set (CMAKE_CXX_FLAGS "-Wall -Wextra -Wsign-compare -Wreturn-type ${CMAKE_CXX_FLAGS}")
+else()
+  set (CMAKE_CXX_FLAGS "/W4 ${CMAKE_CXX_FLAGS}")
+endif()

src/Datetime.cpp

@@ -3124,6 +3124,16 @@ time_t Datetime::timegm(struct tm* tm) {
   time_t ret;
   char* tz;
   tz = getenv("TZ");
+#ifdef _WIN32
+  _putenv_s("TZ", "UTC");
+  _tzset();
+  ret = mktime(tm);
+  if (tz)
+    _putenv_s("TZ", tz);
+  else
+    _putenv_s("TZ", "");
+  _tzset();
+#else
   setenv("TZ", "UTC", 1);
   tzset();
   ret = mktime(tm);
@@ -3132,6 +3142,7 @@ time_t Datetime::timegm(struct tm* tm) {
   else
     unsetenv("TZ");
   tzset();
+#endif
   return ret;
 }
 #endif