style: fix clippy warnings

examples/canvas.rs

@@ -11,7 +11,7 @@ use termion::screen::AlternateScreen;
 use tui::backend::TermionBackend;
 use tui::layout::{Constraint, Direction, Layout, Rect};
 use tui::style::Color;
-use tui::widgets::canvas::{Canvas, Line, Map, MapResolution, Rectangle};
+use tui::widgets::canvas::{Canvas, Map, MapResolution, Rectangle};
 use tui::widgets::{Block, Borders, Widget};
 use tui::Terminal;
 

src/backend/crossterm.rs

@@ -10,12 +10,18 @@ pub struct CrosstermBackend {
     screen: crossterm::Screen,
 }
 
-impl CrosstermBackend {
-    pub fn new() -> CrosstermBackend {
+impl Default for CrosstermBackend {
+    fn default() -> CrosstermBackend {
         CrosstermBackend {
             screen: crossterm::Screen::default(),
         }
     }
+}
+
+impl CrosstermBackend {
+    pub fn new() -> CrosstermBackend {
+        CrosstermBackend::default()
+    }
 
     pub fn screen(&self) -> &crossterm::Screen {
         &self.screen

src/backend/rustbox.rs

@@ -13,7 +13,7 @@ pub struct RustboxBackend {
 impl RustboxBackend {
     pub fn new() -> Result<RustboxBackend, rustbox::InitError> {
         let rustbox = r#try!(rustbox::RustBox::init(Default::default()));
-        Ok(RustboxBackend { rustbox: rustbox })
+        Ok(RustboxBackend { rustbox })
     }
 
     pub fn with_rustbox(instance: rustbox::RustBox) -> RustboxBackend {

src/buffer.rs

@@ -187,10 +187,8 @@ impl Buffer {
             width,
             height,
         });
-        let mut y = 0;
-        for line in &lines {
-            buffer.set_string(0, y, line, Style::default());
-            y += 1;
+        for (y, line) in lines.iter().enumerate() {
+            buffer.set_string(0, y as u16, line, Style::default());
         }
         buffer
     }

src/widgets/barchart.rs

@@ -120,7 +120,7 @@ impl<'a> Widget for BarChart<'a> {
             return;
         }
 
-        self.background(&chart_area, buf, self.style.bg);
+        self.background(chart_area, buf, self.style.bg);
 
         let max = self
             .max

src/widgets/block.rs

@@ -103,7 +103,7 @@ impl<'a> Widget for Block<'a> {
             return;
         }
 
-        self.background(&area, buf, self.style.bg);
+        self.background(area, buf, self.style.bg);
 
         // Sides
         if self.borders.intersects(Borders::LEFT) {

src/widgets/chart.rs

@@ -356,7 +356,7 @@ where
             return;
         }
 
-        self.background(&chart_area, buf, self.style.bg);
+        self.background(chart_area, buf, self.style.bg);
 
         if let Some((x, y)) = layout.title_x {
             let title = self.x_axis.title.unwrap();

src/widgets/gauge.rs

@@ -87,7 +87,7 @@ impl<'a> Widget for Gauge<'a> {
         }
 
         if self.style.bg != Color::Reset {
-            self.background(&gauge_area, buf, self.style.bg);
+            self.background(gauge_area, buf, self.style.bg);
         }
 
         let center = gauge_area.height / 2 + gauge_area.top();

src/widgets/list.rs

@@ -86,7 +86,7 @@ where
             return;
         }
 
-        self.background(&list_area, buf, self.style.bg);
+        self.background(list_area, buf, self.style.bg);
 
         for (i, item) in self
             .items

src/widgets/mod.rs

@@ -68,7 +68,7 @@ pub trait Widget {
     /// implement a custom widget.
     fn draw(&mut self, area: Rect, buf: &mut Buffer);
     /// Helper method to quickly set the background of all cells inside the specified area.
-    fn background(&self, area: &Rect, buf: &mut Buffer, color: Color) {
+    fn background(&self, area: Rect, buf: &mut Buffer, color: Color) {
         for y in area.top()..area.bottom() {
             for x in area.left()..area.right() {
                 buf.get_mut(x, y).set_bg(color);

src/widgets/paragraph.rs

@@ -120,7 +120,7 @@ where
             return;
         }
 
-        self.background(&text_area, buf, self.style.bg);
+        self.background(text_area, buf, self.style.bg);
 
         let style = self.style;
         let mut styled = self.text.by_ref().flat_map(|t| match *t {

src/widgets/table.rs

@@ -167,7 +167,7 @@ where
         };
 
         // Set the background
-        self.background(&table_area, buf, self.style.bg);
+        self.background(table_area, buf, self.style.bg);
 
         // Save widths of the columns that will fit in the given area
         let mut x = 0;

src/widgets/tabs.rs

@@ -109,7 +109,7 @@ where
             return;
         }
 
-        self.background(&tabs_area, buf, self.style.bg);
+        self.background(tabs_area, buf, self.style.bg);
 
         let mut x = tabs_area.left();
         let titles_length = self.titles.len();