Fix two time run

src/main.rs

@@ -40,14 +40,17 @@ fn main() {
 fn activate(app: &gtk::Application) {
     ui::UI.with(|ui_cell| {
         let mut ui = ui_cell.borrow_mut();
-        ui.init(app);
+        if !ui.initialized {
+            ui.init(app);
 
-        let path = nvim_bin_path(std::env::args());
-        let open_arg = open_arg();
-        nvim::initialize(&mut *ui, path.as_ref(), open_arg.as_ref())
-            .expect("Can't start nvim instance");
+            let path = nvim_bin_path(std::env::args());
+            nvim::initialize(&mut *ui, path.as_ref())
+                .expect("Can't start nvim instance");
 
-        guard_dispatch_thread(&mut *ui);
+            guard_dispatch_thread(&mut *ui);
+        }
+
+        nvim::open_file(ui.nvim(), open_arg().as_ref());
     });
 }
 

src/nvim.rs

@@ -65,8 +65,7 @@ macro_rules! try_uint {
 }
 
 pub fn initialize(ui: &mut Ui,
-                  nvim_bin_path: Option<&String>,
-                  open_arg: Option<&String>)
+                  nvim_bin_path: Option<&String>)
                   -> Result<()> {
     let session = if let Some(path) = nvim_bin_path {
         Session::new_child_path(path)?
@@ -84,13 +83,15 @@ pub fn initialize(ui: &mut Ui,
     nvim.ui_attach(80, 24, UiAttachOptions::new()).map_err(|e| Error::new(ErrorKind::Other, e))?;
     nvim.command("runtime! ginit.vim").map_err(|e| Error::new(ErrorKind::Other, e))?;
 
-    if let Some(ref file) = open_arg {
-        nvim.command(&format!("e {}", file)).report_err(nvim);
-    }
-
     Ok(())
 }
 
+pub fn open_file(nvim: &mut NeovimApi, file: Option<&String>) {
+    if let Some(file_name) = file {
+        nvim.command(&format!("e {}", file_name)).report_err(nvim);
+    }
+}
+
 fn nvim_cb(method: &str, params: Vec<Value>) {
     match method {
         "redraw" => {

src/ui.rs

@@ -46,6 +46,7 @@ enum NvimMode {
 
 pub struct Ui {
     pub model: UiModel,
+    pub initialized: bool,
     nvim: Option<Neovim>,
     drawing_area: DrawingArea,
     window: Option<ApplicationWindow>,
@@ -82,6 +83,7 @@ impl Ui {
             mouse_enabled: false,
             mouse_pressed: false,
             font_desc: FontDescription::from_string(FONT_NAME),
+            initialized: false,
         }
     }
 
@@ -98,6 +100,11 @@ impl Ui {
     }
 
     pub fn init(&mut self, app: &gtk::Application) {
+        if self.initialized { 
+            return
+        }
+        self.initialized = true;
+
         SET.with(|settings| {
             let mut settings = settings.borrow_mut();
             settings.init(self);