diff --git a/src/lib.rs b/src/lib.rs
index 2140d20..74401b4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,10 +16,10 @@
 
 use im::Vector;
 
-use serde::{Serialize, Deserialize};
-use serde::ser::{Serializer};
-use serde::de::{Deserializer, Visitor, SeqAccess};
-use std::vec::{Vec};
+use serde::de::{Deserializer, SeqAccess, Visitor};
+use serde::ser::Serializer;
+use serde::{Deserialize, Serialize};
+use std::vec::Vec;
 
 #[derive(Debug, Clone, druid::Data)]
 pub struct Path {
@@ -147,7 +147,7 @@ impl<'de> Visitor<'de> for PathDeserializer {
 
     fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
     where
-        A: SeqAccess<'de>
+        A: SeqAccess<'de>,
     {
         use druid::kurbo::BezPath;
 
@@ -162,14 +162,14 @@ impl<'de> Visitor<'de> for PathDeserializer {
             }
         }
 
-        Ok(Path{ kurbo_path })
+        Ok(Path { kurbo_path })
     }
 }
 
 impl<'de> Deserialize<'de> for Path {
     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where
-        D: Deserializer<'de>
+        D: Deserializer<'de>,
     {
         deserializer.deserialize_seq(PathDeserializer)
     }
@@ -180,17 +180,13 @@ impl Serialize for Path {
     where
         S: Serializer,
     {
-        use druid::kurbo::{PathEl};
+        use druid::kurbo::PathEl;
 
-        serializer.collect_seq(
-            self.kurbo_path.iter()
-                .filter_map(|path_el| {
-                    match path_el {
-                        PathEl::MoveTo(pt) => Some(Into::<(f64, f64)>::into(pt)),
-                        PathEl::LineTo(pt) => Some(Into::<(f64, f64)>::into(pt)),
-                        _ => None
-                    }
-                }))
+        serializer.collect_seq(self.kurbo_path.iter().filter_map(|path_el| match path_el {
+            PathEl::MoveTo(pt) => Some(Into::<(f64, f64)>::into(pt)),
+            PathEl::LineTo(pt) => Some(Into::<(f64, f64)>::into(pt)),
+            _ => None,
+        }))
     }
 }
 
diff --git a/src/main.rs b/src/main.rs
index 618fa99..89d7424 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,13 +16,16 @@
 
 use log::{info, warn};
 
+use druid::commands;
 use druid::im::{vector, Vector};
 use druid::kurbo::BezPath;
 use druid::widget::prelude::*;
-use druid::{AppLauncher, Color, Data, Event, LocalizedString, WindowDesc, AppDelegate, Target, Env, DelegateCtx, FileDialogOptions, FileSpec, Command};
-use druid::commands;
+use druid::{
+    AppDelegate, AppLauncher, Color, Command, Data, DelegateCtx, Env, Event, FileDialogOptions,
+    FileSpec, LocalizedString, Target, WindowDesc,
+};
 
-use stiletto::{CanvasElement, VersionedCanvas, Canvas, DocumentSnapshot};
+use stiletto::{Canvas, CanvasElement, DocumentSnapshot, VersionedCanvas};
 
 struct Delegate;
 
@@ -51,7 +54,7 @@ impl CanvasData {
 
     fn get_document_snapshot(&self) -> DocumentSnapshot {
         DocumentSnapshot {
-            canvas_elements: self.elements.get().iter().cloned().collect()
+            canvas_elements: self.elements.get().iter().cloned().collect(),
         }
     }
 
@@ -88,11 +91,9 @@ impl Widget<CanvasData> for CanvasWidget {
             Event::MouseUp(_) => {
                 if data.is_drawing() {
                     if let Some(current_element) = data.current_element.take() {
-
                         data.elements.update(move |canvas: &mut Canvas| {
                             canvas.push_back(current_element);
                         });
-
                     }
                 }
             }
@@ -167,12 +168,15 @@ impl Widget<CanvasData> for CanvasWidget {
 
 fn build_ui() -> impl Widget<CanvasData> {
     use druid::widget::{Align, Button, CrossAxisAlignment, Flex, SizedBox};
-    let history_buttons = Flex::row()
-        .cross_axis_alignment(CrossAxisAlignment::Center)
-        .with_child(
-            Button::new("Undo").on_click(|_ctx: &mut EventCtx, data: &mut CanvasData, _env: &Env| data.perform_undo())
-        )
-        .with_child(Button::new("Redo").on_click(|_ctx: &mut EventCtx, data: &mut CanvasData, _env: &Env| data.perform_redo()));
+    let history_buttons =
+        Flex::row()
+            .cross_axis_alignment(CrossAxisAlignment::Center)
+            .with_child(Button::new("Undo").on_click(
+                |_ctx: &mut EventCtx, data: &mut CanvasData, _env: &Env| data.perform_undo(),
+            ))
+            .with_child(Button::new("Redo").on_click(
+                |_ctx: &mut EventCtx, data: &mut CanvasData, _env: &Env| data.perform_redo(),
+            ));
 
     let stlt = FileSpec::new("Stiletto notebook", &["stlt"]);
     let save_dialog_options = FileDialogOptions::new()
@@ -182,29 +186,24 @@ fn build_ui() -> impl Widget<CanvasData> {
 
     let save_buttons = Flex::row()
         .cross_axis_alignment(CrossAxisAlignment::Center)
-        .with_child(
-            Button::new("Open")
-                .on_click(move |ctx, _, _| {
-                    ctx.submit_command(
-                        Command::new(
-                            druid::commands::SHOW_OPEN_PANEL,
-                            open_dialog_options.clone(),
-                        ),
-                        None,
-                    )
-                }))
-        .with_child(
-            Button::new("Save")
-                .on_click(move |ctx, _, _| {
-                    ctx.submit_command(
-                        Command::new(
-                            druid::commands::SHOW_SAVE_PANEL,
-                            save_dialog_options.clone(),
-                        ),
-                        None,
-                    )
-                }));
-
+        .with_child(Button::new("Open").on_click(move |ctx, _, _| {
+            ctx.submit_command(
+                Command::new(
+                    druid::commands::SHOW_OPEN_PANEL,
+                    open_dialog_options.clone(),
+                ),
+                None,
+            )
+        }))
+        .with_child(Button::new("Save").on_click(move |ctx, _, _| {
+            ctx.submit_command(
+                Command::new(
+                    druid::commands::SHOW_SAVE_PANEL,
+                    save_dialog_options.clone(),
+                ),
+                None,
+            )
+        }));
 
     let toolbar = Flex::row()
         .cross_axis_alignment(CrossAxisAlignment::Center)
@@ -264,7 +263,8 @@ impl AppDelegate<CanvasData> for Delegate {
         }
         if let Some(file_info) = cmd.get(commands::OPEN_FILE) {
             if let Ok(f) = File::open(file_info.path()) {
-                let res_snapshot: Result<DocumentSnapshot, serde_json::Error> = serde_json::from_reader(f);
+                let res_snapshot: Result<DocumentSnapshot, serde_json::Error> =
+                    serde_json::from_reader(f);
                 if let Ok(document_snapshot) = res_snapshot {
                     data.set_from_snapshot(document_snapshot);
                     info!("Loaded file {}", file_info.path().display());