Fix tree-wide clippy lints

Signed-off-by: Christoph Heiss <christoph@c8h4.io>

src/commands/buffer.rs

@@ -22,7 +22,7 @@ pub fn save(app: &mut Application) -> Result {
         .path
         .clone(); // clone instead of borrow as we call another command later
 
-    if path.is_some() {
+    if let Some(path) = path {
         // Save the buffer.
         app.workspace
             .current_buffer
@@ -32,7 +32,7 @@ pub fn save(app: &mut Application) -> Result {
             .chain_err(|| BUFFER_SAVE_FAILED)?;
 
         // Run the format command if one is defined.
-        if app.preferences.borrow().format_on_save(&path.unwrap()) {
+        if app.preferences.borrow().format_on_save(&path) {
             format(app)?;
 
             // Save the buffer again. We intentionally save twice because we
@@ -914,7 +914,7 @@ pub fn insert_tab(app: &mut Application) -> Result {
         .ok_or(BUFFER_MISSING)?;
     let tab_content = app.preferences.borrow().tab_content(buffer.path.as_ref());
     let tab_content_width = tab_content.chars().count();
-    buffer.insert(tab_content.clone());
+    buffer.insert(tab_content);
 
     // Move the cursor to the end of the inserted content.
     for _ in 0..tab_content_width {

src/commands/selection.rs

@@ -63,7 +63,7 @@ fn copy_to_clipboard(app: &mut Application) -> Result {
             let selected_range = Range::new(cursor_position, select_mode.anchor);
 
             let data = buffer
-                .read(&selected_range.clone())
+                .read(&selected_range)
                 .ok_or("Couldn't read selected data from buffer")?;
             app.clipboard.set_content(ClipboardContent::Inline(data))?;
         }
@@ -72,7 +72,7 @@ fn copy_to_clipboard(app: &mut Application) -> Result {
                 util::inclusive_range(&LineRange::new(mode.anchor, buffer.cursor.line), buffer);
 
             let data = buffer
-                .read(&selected_range.clone())
+                .read(&selected_range)
                 .ok_or("Couldn't read selected data from buffer")?;
             app.clipboard.set_content(ClipboardContent::Block(data))?;
         }

src/input/key_map/mod.rs

@@ -66,7 +66,7 @@ impl KeyMap {
         let default_keymap_data = YamlLoader::load_from_str(KeyMap::default_data())
             .chain_err(|| "Couldn't parse default keymap")?
             .into_iter()
-            .nth(0)
+            .next()
             .ok_or("Couldn't locate a document in the default keymap")?;
 
         KeyMap::from(default_keymap_data.as_hash().unwrap())

src/models/application/clipboard.rs

@@ -77,8 +77,8 @@ impl Clipboard {
         };
 
         // Update the in-app clipboard if we've found newer content.
-        if new_content.is_some() {
-            self.content = new_content.unwrap();
+        if let Some(new_content) = new_content {
+            self.content = new_content;
         }
 
         &self.content