source: clean up structure

1 files changed, 31 insertions, 0 deletions

diff --git a/source/lib/src/filesystem.cpp b/source/lib/src/filesystem.cpp
new file mode 100644
index 0000000..35b6b40
--- /dev/null
+++ b/source/lib/src/filesystem.cpp
@@ -0,0 +1,31 @@
+#include "wanda/filesystem.hpp"
+
+#include <random>
+#include <ranges>
+
+namespace wanda
+{
+  std::optional<path_list> scan(std::filesystem::path source, bool(filter)(std::filesystem::path const &))
+  {
+    if (!std::filesystem::is_directory(source))
+    {
+      return std::nullopt;
+    }
+    auto entries = std::filesystem::recursive_directory_iterator{source};
+    auto result = path_list{};
+    for (auto & entry : entries | std::views::filter(filter))
+    {
+      result.push_back(entry.path());
+    }
+    return result;
+  }
+
+  std::filesystem::path random_pick(path_list const & paths)
+  {
+    static auto generator = std::mt19937{std::random_device{}()};
+    auto distribution = std::uniform_int_distribution<std::size_t>{0, paths.size() - 1};
+
+    return paths[distribution(generator)];
+  }
+
+}  // namespace wanda
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