Common/FileUtil: Add CreateDirs() function as a wrapper around std::filesystem::create_directories().

Source/Core/Common/FileUtil.cpp

@@ -193,7 +193,6 @@ bool Delete(const std::string& filename, IfAbsentBehavior behavior)
   return true;
 }
 
-// Returns true if successful, or path already exists.
 bool CreateDir(const std::string& path)
 {
   DEBUG_LOG_FMT(COMMON, "{}: directory {}", __func__, path);
@@ -209,6 +208,22 @@ bool CreateDir(const std::string& path)
   return success;
 }
 
+bool CreateDirs(std::string_view path)
+{
+  DEBUG_LOG_FMT(COMMON, "{}: directory {}", __func__, path);
+
+  std::error_code error;
+  auto native_path = StringToPath(path);
+  bool success = fs::create_directories(native_path, error);
+  // If the path was not created, check if it was a pre-existing directory
+  std::error_code error_ignored;
+  if (!success && fs::is_directory(native_path, error_ignored))
+    success = true;
+  if (!success)
+    ERROR_LOG_FMT(COMMON, "{}: failed on {}: {}", __func__, path, error.message());
+  return success;
+}
+
 bool CreateFullPath(std::string_view fullPath)
 {
   DEBUG_LOG_FMT(COMMON, "{}: path {}", __func__, fullPath);

Source/Core/Common/FileUtil.h

@@ -140,9 +140,12 @@ u64 GetSize(const std::string& path);
 // Overloaded GetSize, accepts FILE*
 u64 GetSize(FILE* f);
 
-// Returns true if successful, or path already exists.
+// Creates a single directory. Returns true if successful or if the path already exists.
 bool CreateDir(const std::string& filename);
 
+// Creates directories recursively. Returns true if successful or if the path already exists.
+bool CreateDirs(std::string_view filename);
+
 // Creates the full path to the file given in fullPath.
 // That is, for path '/a/b/c.bin', creates folders '/a' and '/a/b'.
 // Returns true if creation is successful or if the path already exists.