1 files changed, 87 insertions, 0 deletions
diff --git a/src/tangara/lua/file_iterator.cpp b/src/tangara/lua/file_iterator.cpp
new file mode 100644
index 00000000..194859a6
--- /dev/null
+++ b/src/tangara/lua/file_iterator.cpp
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2023 ailurux <ailuruxx@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+#include "file_iterator.hpp"
+#include "esp_log.h"
+
+#include <string>
+
+#include "ff.h"
+#include "spi.hpp"
+
+namespace database {
+
+[[maybe_unused]] static const char* kTag = "FileIterator";
+
+FileIterator::FileIterator(std::string filepath) 
+: original_path_(filepath),
+  current_(),
+  offset_(-1)
+ {
+  auto lock = drivers::acquire_spi();
+
+  const TCHAR* path = static_cast<const TCHAR*>(filepath.c_str());
+  FRESULT res = f_opendir(&dir_, path);
+  if (res != FR_OK) {
+    ESP_LOGE(kTag, "Error opening directory: %s", filepath.c_str());
+  }
+}
+
+FileIterator::~FileIterator() {
+  auto lock = drivers::acquire_spi();
+  f_closedir(&dir_);
+}
+
+auto FileIterator::value() const -> const std::optional<FileEntry>& {
+  return current_;
+}
+
+auto FileIterator::next() -> void {
+  iterate(false);
+}
+
+auto FileIterator::prev() -> void {
+  if (offset_ == 0) {
+    current_.reset();
+    return;
+  }
+  f_rewinddir(&dir_);
+  auto new_offset = offset_-1;
+  offset_ = -1;
+  for (int i = 0; i <= new_offset; i++) {
+    iterate(false);
+  }
+}
+
+auto FileIterator::iterate(bool reverse) -> bool {
+    FILINFO info;
+    {
+      auto lock = drivers::acquire_spi();
+      auto res = f_readdir(&dir_, &info);
+      if (res != FR_OK) {
+        ESP_LOGE(kTag, "Error reading directory. Error: %d", res);
+        return false;
+      }
+    }
+    if (info.fname[0] == 0) {
+      // End of directory
+      // Set value to nil
+      current_.reset();
+    } else {
+      // Update current value
+      offset_++;
+      current_ = FileEntry{
+        .index = offset_,
+        .isHidden = (info.fattrib & AM_HID) > 0,
+        .isDirectory = (info.fattrib & AM_DIR) > 0,
+        .isTrack = false, // TODO
+        .filepath = original_path_ + (original_path_.size()>0?"/":"") + info.fname,
+
+      };
+    }
+    return true;
+}
+
+}  // namespace database
+\ No newline at end of file