init

src/idbfs.rs

@@ -0,0 +1,82 @@
+#[cfg(target_os = "emscripten")]
+use std::ffi::CString;
+
+fn normalize_mount_path(path: &str) -> String {
+    let trimmed = path.trim();
+    let no_slash = trimmed.trim_end_matches('/');
+    let no_dot = no_slash.strip_prefix("./").unwrap_or(no_slash);
+
+    if no_dot.is_empty() {
+        "/".to_string()
+    } else if no_dot.starts_with('/') {
+        no_dot.to_string()
+    } else {
+        format!("/{no_dot}")
+    }
+}
+
+#[cfg(target_os = "emscripten")]
+unsafe extern "C" {
+    fn emscripten_run_script(script: *const core::ffi::c_char);
+}
+
+#[cfg(target_os = "emscripten")]
+fn run_script(script: &str) -> Result<(), String> {
+    let script = CString::new(script).map_err(|e| format!("invalid JS script: {e}"))?;
+    unsafe {
+        emscripten_run_script(script.as_ptr());
+    }
+    Ok(())
+}
+
+#[cfg(not(target_os = "emscripten"))]
+fn run_script(_script: &str) -> Result<(), String> {
+    Ok(())
+}
+
+pub fn init_idbfs_for_path(path: &str) -> Result<String, String> {
+    let mount_path = normalize_mount_path(path);
+    let script = format!(
+        r#"(function() {{
+  if (typeof FS === 'undefined' || typeof IDBFS === 'undefined') {{
+    console.warn('[anisette-rs] FS/IDBFS unavailable');
+    return;
+  }}
+  var mp = "{mount_path}";
+  try {{ FS.mkdirTree(mp); }} catch (_e) {{}}
+  try {{ FS.mount(IDBFS, {{}}, mp); }} catch (_e) {{}}
+  FS.syncfs(true, function(err) {{
+    if (err) {{
+      console.error('[anisette-rs] IDBFS initial sync failed', err);
+    }} else {{
+      console.log('[anisette-rs] IDBFS ready at ' + mp);
+    }}
+  }});
+}})();"#,
+    );
+    run_script(&script)?;
+    Ok(mount_path)
+}
+
+pub fn sync_idbfs(populate_from_storage: bool) -> Result<(), String> {
+    let populate = if populate_from_storage {
+        "true"
+    } else {
+        "false"
+    };
+    let script = format!(
+        r#"(function() {{
+  if (typeof FS === 'undefined') {{
+    return;
+  }}
+  FS.syncfs({populate}, function(err) {{
+    if (err) {{
+      console.error('[anisette-rs] IDBFS sync failed', err);
+    }} else {{
+      console.log('[anisette-rs] IDBFS sync done');
+    }}
+  }});
+}})();"#,
+    );
+    run_script(&script)
+}