fs: implement filesystem access

1 files changed, 30 insertions, 0 deletions

diff --git a/src/filesystem.cpp b/src/filesystem.cpp
new file mode 100644
index 0000000..4dfa183
--- /dev/null
+++ b/src/filesystem.cpp
@@ -0,0 +1,30 @@
+#include "filesystem.hpp"
+
+#include <boost/iterator/filter_iterator.hpp>
+
+#include <random>
+
+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 first = boost::make_filter_iterator(filter, std::filesystem::recursive_directory_iterator{source});
+    auto last = boost::make_filter_iterator(filter, std::filesystem::recursive_directory_iterator{});
+    return path_list{first, last};
+}
+
+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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