Enable cache again

Author: mgreter

src/file.cpp

@@ -2,6 +2,12 @@
 // __EXTENSIONS__ fix on Solaris.
 #include "sass.hpp"
 
+#if defined (_MSC_VER) // Visual studio
+#define thread_local __declspec( thread )
+#elif defined (__GCC__) // GCC
+#define thread_local __thread
+#endif
+
 #ifdef _WIN32
 # ifdef __MINGW32__
 #  ifndef off64_t
@@ -76,18 +82,18 @@ namespace Sass {
     }
 
 
-    // static thread_local std::unordered_map<
-    //   sass::string, bool> cached;
+    static thread_local std::unordered_map<
+      sass::string, bool> cached;
 
     // test if path exists and is a file
     // ToDo: Move the cache to context for thread safety
     bool file_exists(const sass::string& path, const sass::string& CWD)
     {
-      // auto it = cached.find(path);
-      // if (it != cached.end()) {
-      //   // std::cerr << "cached reg " << path << "\n";
-      //   return it->second;
-      // }
+      auto it = cached.find(path);
+      if (it != cached.end()) {
+        // std::cerr << "cached reg " << path << "\n";
+        return it->second;
+      }
       #ifdef _WIN32
         wchar_t resolved[32768];
         // windows unicode filepaths are encoded in utf16
@@ -110,13 +116,13 @@ namespace Sass {
         bool result = (dwAttrib != INVALID_FILE_ATTRIBUTES
           && (!(dwAttrib & FILE_ATTRIBUTE_DIRECTORY)));
         // cached[abspath] = result;
-        // cached[path] = result;
+        cached[path] = result;
         return result;
       #else
         struct stat st_buf;
         bool result = (stat (path.c_str(), &st_buf) == 0)
           && (!S_ISDIR (st_buf.st_mode));
-        // cached[path] = result;
+        cached[path] = result;
         return result;
 #endif
     }