create native file engine bindings for TUI/Blitz

packages/html/src/native_bind/mod.rs

@@ -0,0 +1,3 @@
+mod native_file_engine;
+
+pub use native_file_engine::*;

packages/html/src/native_bind/native_file_engine.rs

@@ -0,0 +1,43 @@
+use std::path::PathBuf;
+
+use crate::FileEngine;
+use tokio::fs::File;
+use tokio::io::AsyncReadExt;
+
+pub struct NativeFileEngine {
+    files: Vec<PathBuf>,
+}
+
+impl NativeFileEngine {
+    pub fn new(files: Vec<PathBuf>) -> Self {
+        Self { files }
+    }
+}
+
+#[async_trait::async_trait(?Send)]
+impl FileEngine for NativeFileEngine {
+    fn files(&self) -> Vec<String> {
+        self.files
+            .iter()
+            .filter_map(|f| Some(f.to_str()?.to_string()))
+            .collect()
+    }
+
+    async fn read_file(&self, file: &str) -> Option<Vec<u8>> {
+        let mut file = File::open(file).await.ok()?;
+
+        let mut contents = Vec::new();
+        file.read_to_end(&mut contents).await.ok()?;
+
+        Some(contents)
+    }
+
+    async fn read_file_to_string(&self, file: &str) -> Option<String> {
+        let mut file = File::open(file).await.ok()?;
+
+        let mut contents = String::new();
+        file.read_to_string(&mut contents).await.ok()?;
+
+        Some(contents)
+    }
+}