[Base] Added Listing directories and filtering filenames by regex

Author: Gliniak

src/xenia/base/filesystem.h

@@ -13,6 +13,7 @@
 #include <filesystem>
 #include <iterator>
 #include <memory>
+#include <regex>
 #include <string>
 #include <string_view>
 #include <vector>
@@ -123,6 +124,9 @@ struct FileInfo {
 };
 bool GetInfo(const std::filesystem::path& path, FileInfo* out_info);
 std::vector<FileInfo> ListFiles(const std::filesystem::path& path);
+std::vector<FileInfo> ListDirectories(const std::filesystem::path& path);
+std::vector<FileInfo> FilterByName(const std::vector<FileInfo> files,
+                                   const std::regex pattern);
 
 #if XE_PLATFORM_ANDROID
 void AndroidInitialize();

src/xenia/base/filesystem_win.cc

@@ -261,5 +261,29 @@ std::vector<FileInfo> ListFiles(const std::filesystem::path& path) {
   return result;
 }
 
+std::vector<FileInfo> ListDirectories(const std::filesystem::path& path) {
+  std::vector<FileInfo> files = ListFiles(path);
+  std::vector<FileInfo> directories = {};
+
+  std::copy_if(
+      files.cbegin(), files.cend(), std::back_inserter(directories),
+      [](FileInfo file) { return file.type == FileInfo::Type::kDirectory; });
+
+  return directories;
+}
+
+std::vector<FileInfo> FilterByName(const std::vector<FileInfo>& files,
+                                   const std::regex pattern) {
+  std::vector<FileInfo> filtered_entries = {};
+
+  std::copy_if(files.cbegin(), files.cend(),
+               std::back_inserter(filtered_entries), [pattern](FileInfo file) {
+                 return std::regex_match(file.name.filename().string(),
+                                         pattern);
+               });
+
+  return filtered_entries;
+}
+
 }  // namespace filesystem
 }  // namespace xe