Reopen changed files

src/basic/filesystem.h

@@ -26,13 +26,14 @@ void     Advance(FileIter *it);
 FileIter IterateFiles(Allocator allocator, String path);
 void     InitOS(void (*error_proc)(const char *, ...));
 
-String GetExePath(Allocator allocator);
-String GetExeDir(Allocator allocator);
-bool   FileExists(String path);
-bool   IsDir(String path);
-bool   IsFile(String path);
-String GetWorkingDir(Allocator arena);
-bool   IsAbsolute(String path);
+String  GetExePath(Allocator allocator);
+String  GetExeDir(Allocator allocator);
+bool    FileExists(String path);
+bool    IsDir(String path);
+bool    IsFile(String path);
+String  GetWorkingDir(Allocator arena);
+bool    IsAbsolute(String path);
+int64_t GetFileModTime(String file);
 
 struct Process {
     bool is_valid;

src/basic/win32.cpp

@@ -262,6 +262,21 @@ bool DeleteFile(String path) {
     return result;
 }
 
+int64_t GetFileModTime(String file) {
+    Scratch          scratch;
+    String16         string16 = ToString16(scratch, file);
+    WIN32_FIND_DATAW data;
+    HANDLE           handle = FindFirstFileW(string16.data, &data);
+    if (handle != INVALID_HANDLE_VALUE) {
+        FindClose(handle);
+        FILETIME time   = data.ftLastWriteTime;
+        int64_t  result = (int64_t)time.dwHighDateTime << 32 | time.dwLowDateTime;
+        return result;
+    } else {
+        return -1;
+    }
+}
+
 struct Win32Process {
     HANDLE handle;
     HANDLE child_stdout_read;