Add sparkline widget and fix warnings

Cargo.toml

@@ -8,4 +8,7 @@ termion = "1.1.1"
 bitflags = "0.7"
 cassowary = "0.2.0"
 log = "0.3"
+
+[dev-dependencies]
 log4rs = "*"
+rand = "0.3"

examples/prototype.rs

@@ -3,23 +3,23 @@ extern crate tui;
 extern crate log;
 extern crate log4rs;
 extern crate termion;
+extern crate rand;
 
 use std::thread;
 use std::time;
 use std::sync::mpsc;
-use std::io::{Write, stdin};
+use std::io::stdin;
 
 use termion::event;
 use termion::input::TermRead;
 
 use log::LogLevelFilter;
-use log4rs::append::console::ConsoleAppender;
 use log4rs::append::file::FileAppender;
 use log4rs::encode::pattern::PatternEncoder;
 use log4rs::config::{Appender, Config, Logger, Root};
 
 use tui::Terminal;
-use tui::widgets::{Widget, Block, List, Gauge, border};
+use tui::widgets::{Widget, Block, List, Gauge, Sparkline, border};
 use tui::layout::{Group, Direction, Alignment, Size};
 
 struct App {
@@ -29,6 +29,7 @@ struct App {
     selected: usize,
     show_episodes: bool,
     progress: u16,
+    data: Vec<u64>,
 }
 
 enum Event {
@@ -58,6 +59,7 @@ fn main() {
         selected: 0,
         show_episodes: false,
         progress: 0,
+        data: (0..100).map(|_| rand::random::<u8>() as u64).collect(),
     };
     let (tx, rx) = mpsc::channel();
     let input_tx = tx.clone();
@@ -115,6 +117,8 @@ fn main() {
                 if app.progress > 100 {
                     app.progress = 0;
                 }
+                app.data.insert(0, rand::random::<u8>() as u64);
+                app.data.pop();
             }
         }
     }
@@ -128,6 +132,7 @@ fn draw(terminal: &mut Terminal, app: &App) {
         .alignment(Alignment::Left)
         .chunks(&[Size::Fixed(5), Size::Percent(80), Size::Fixed(10)])
         .render(&terminal.area(), |chunks, tree| {
+            info!("{:?}", terminal.area());
             tree.add(Block::default().borders(border::ALL).title("Gauges").render(&chunks[0]));
             tree.add(Group::default()
                 .direction(Direction::Vertical)
@@ -138,14 +143,14 @@ fn draw(terminal: &mut Terminal, app: &App) {
                     tree.add(Gauge::new()
                         .percent(app.progress)
                         .render(&chunks[0]));
-                    tree.add(Gauge::new()
-                        .percent(app.progress)
+                    tree.add(Sparkline::new()
+                        .data(&app.data)
                         .render(&chunks[2]));
                 }));
             let sizes = if app.show_episodes {
                 vec![Size::Percent(50), Size::Percent(50)]
             } else {
-                vec![Size::Percent(50), Size::Percent(50)]
+                vec![Size::Percent(100)]
             };
             tree.add(Group::default()
                 .direction(Direction::Horizontal)
@@ -153,9 +158,7 @@ fn draw(terminal: &mut Terminal, app: &App) {
                 .chunks(&sizes)
                 .render(&chunks[1], |chunks, tree| {
                     tree.add(List::default()
-                        .block(|b| {
-                            b.borders(border::ALL).title("Podcasts");
-                        })
+                        .block(*Block::default().borders(border::ALL).title("Podcasts"))
                         .items(&app.items)
                         .select(app.selected)
                         .formatter(|i, s| {

src/.lib.rs.rustfmt

@@ -1,22 +0,0 @@
-extern crate termion;
-#[macro_use]
-extern crate bitflags;
-#[macro_use]
-extern crate log;
-extern crate cassowary;
-
-mod buffer;
-mod util;
-pub mod symbols;
-pub mod terminal;
-pub mod widgets;
-pub mod style;
-pub mod layout;
-
-pub use self::terminal::Terminal;
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {}
-}

src/layout.rs

@@ -121,6 +121,7 @@ pub enum Size {
 /// }
 ///
 /// ```
+#[allow(unused_variables)]
 pub fn split(area: &Rect,
              dir: &Direction,
              align: &Alignment,

src/symbols.rs

@@ -8,3 +8,14 @@ pub mod block {
     pub const ONE_QUATER: char = '▎';
     pub const ONE_EIGHTH: char = '▏';
 }
+
+pub mod bar {
+    pub const FULL: char = '█';
+    pub const SEVEN_EIGHTHS: char = '▇';
+    pub const THREE_QUATERS: char = '▆';
+    pub const FIVE_EIGHTHS: char = '▅';
+    pub const HALF: char = '▄';
+    pub const THREE_EIGHTHS: char = '▃';
+    pub const ONE_QUATER: char = '▂';
+    pub const ONE_EIGHTH: char = '▁';
+}

src/terminal.rs

@@ -59,7 +59,7 @@ impl Terminal {
             }
             previous.insert((node.widget_type, area), node.hash);
         }
-        for (&(t, a), h) in &self.previous {
+        for (&(t, a), _h) in &self.previous {
             buffers.insert(0, Buffer::empty(a));
             debug!("Erased {:?} at {:?}", t, a);
         }

src/util.rs

@@ -1,10 +1,12 @@
-use std::hash::{Hash, SipHasher, Hasher};
+use std::collections::hash_map::RandomState;
+use std::hash::{Hash, Hasher, BuildHasher};
 
 use layout::Rect;
 
 pub fn hash<T: Hash>(t: &T, area: &Rect) -> u64 {
-    let mut s = SipHasher::new();
-    t.hash(&mut s);
-    area.hash(&mut s);
-    s.finish()
+    let state = RandomState::new();
+    let mut hasher = state.build_hasher();
+    t.hash(&mut hasher);
+    area.hash(&mut hasher);
+    hasher.finish()
 }

src/widgets/block.rs

@@ -36,7 +36,7 @@ impl<'a> Block<'a> {
 }
 
 impl<'a> Widget for Block<'a> {
-    fn _buffer(&self, area: &Rect) -> Buffer {
+    fn buffer(&self, area: &Rect) -> Buffer {
 
         let mut buf = Buffer::empty(*area);
 

src/widgets/gauge.rs

@@ -47,9 +47,9 @@ impl<'a> Gauge<'a> {
 }
 
 impl<'a> Widget for Gauge<'a> {
-    fn _buffer(&self, area: &Rect) -> Buffer {
+    fn buffer(&self, area: &Rect) -> Buffer {
         let (mut buf, gauge_area) = match self.block {
-            Some(ref b) => (b._buffer(area), area.inner(1)),
+            Some(ref b) => (b.buffer(area), area.inner(1)),
             None => (Buffer::empty(*area), *area),
         };
         if gauge_area.height < 1 {

src/widgets/list.rs

@@ -7,7 +7,7 @@ use widgets::{Widget, WidgetType, Block};
 use layout::Rect;
 
 pub struct List<'a, T> {
-    block: Block<'a>,
+    block: Option<Block<'a>>,
     selected: usize,
     formatter: Box<Fn(&T, bool) -> String>,
     items: Vec<T>,
@@ -26,7 +26,7 @@ impl<'a, T> Hash for List<'a, T>
 impl<'a, T> Default for List<'a, T> {
     fn default() -> List<'a, T> {
         List {
-            block: Block::default(),
+            block: None,
             selected: 0,
             formatter: Box::new(|_, _| String::from("")),
             items: Vec::new(),
@@ -37,10 +37,8 @@ impl<'a, T> Default for List<'a, T> {
 impl<'a, T> List<'a, T>
     where T: Clone
 {
-    pub fn block<F>(&'a mut self, f: F) -> &mut List<'a, T>
-        where F: Fn(&mut Block)
-    {
-        f(&mut self.block);
+    pub fn block(&'a mut self, block: Block<'a>) -> &mut List<'a, T> {
+        self.block = Some(block);
         self
     }
 
@@ -65,14 +63,14 @@ impl<'a, T> List<'a, T>
 impl<'a, T> Widget for List<'a, T>
     where T: Display + Hash
 {
-    fn _buffer(&self, area: &Rect) -> Buffer {
-        let mut buf = self.block.buffer(area);
-        if area.area() == 0 {
-            return buf;
-        }
+    fn buffer(&self, area: &Rect) -> Buffer {
+
+        let (mut buf, list_area) = match self.block {
+            Some(ref b) => (b.buffer(area), area.inner(1)),
+            None => (Buffer::empty(*area), *area),
+        };
 
         let list_length = self.items.len();
-        let list_area = area.inner(1);
         let list_height = list_area.height as usize;
         let bound = min(list_height, list_length);
         let offset = if self.selected > list_height {

src/widgets/mod.rs

@@ -1,10 +1,12 @@
 mod block;
 mod list;
 mod gauge;
+mod sparkline;
 
 pub use self::block::Block;
 pub use self::list::List;
 pub use self::gauge::Gauge;
+pub use self::sparkline::Sparkline;
 
 use std::hash::Hash;
 
@@ -13,6 +15,7 @@ use buffer::{Buffer, Cell};
 use layout::{Rect, Tree, Leaf};
 use style::Color;
 
+#[allow(dead_code)]
 enum Line {
     Horizontal,
     Vertical,
@@ -88,16 +91,11 @@ pub enum WidgetType {
     Block,
     List,
     Gauge,
+    Sparkline,
 }
 
 pub trait Widget: Hash {
-    fn _buffer(&self, area: &Rect) -> Buffer;
-    fn buffer(&self, area: &Rect) -> Buffer {
-        match area.area() {
-            0 => Buffer::empty(*area),
-            _ => self._buffer(area),
-        }
-    }
+    fn buffer(&self, area: &Rect) -> Buffer;
     fn widget_type(&self) -> WidgetType;
     fn render(&self, area: &Rect) -> Tree {
         let widget_type = self.widget_type();

src/widgets/sparkline.rs

@@ -0,0 +1,84 @@
+use std::cmp::min;
+
+use layout::Rect;
+use buffer::Buffer;
+use widgets::{Widget, WidgetType, Block};
+use style::Color;
+use symbols::bar;
+
+#[derive(Hash)]
+pub struct Sparkline<'a> {
+    block: Option<Block<'a>>,
+    color: Color,
+    data: Vec<u64>,
+}
+
+impl<'a> Sparkline<'a> {
+    pub fn new() -> Sparkline<'a> {
+        Sparkline {
+            block: None,
+            color: Color::White,
+            data: Vec::new(),
+        }
+    }
+
+    pub fn block(&mut self, block: Block<'a>) -> &mut Sparkline<'a> {
+        self.block = Some(block);
+        self
+    }
+
+    pub fn color(&mut self, color: Color) -> &mut Sparkline<'a> {
+        self.color = color;
+        self
+    }
+
+    pub fn data(&mut self, data: &[u64]) -> &mut Sparkline<'a> {
+        self.data = data.to_vec();
+        self
+    }
+}
+
+impl<'a> Widget for Sparkline<'a> {
+    fn buffer(&self, area: &Rect) -> Buffer {
+        let (mut buf, spark_area) = match self.block {
+            Some(ref b) => (b.buffer(area), area.inner(1)),
+            None => (Buffer::empty(*area), *area),
+        };
+        if spark_area.height < 1 {
+            return buf;
+        } else {
+            let margin = spark_area.x - area.x;
+            match self.data.iter().max() {
+                Some(max_value) => {
+                    let max_index = min(spark_area.width as usize, self.data.len());
+                    let line = self.data
+                        .iter()
+                        .take(max_index)
+                        .filter_map(|e| {
+                            let value = e * 8 / max_value;
+                            match value {
+                                0 => Some(' '),
+                                1 => Some(bar::ONE_EIGHTH),
+                                2 => Some(bar::ONE_QUATER),
+                                3 => Some(bar::THREE_EIGHTHS),
+                                4 => Some(bar::HALF),
+                                5 => Some(bar::FIVE_EIGHTHS),
+                                6 => Some(bar::THREE_EIGHTHS),
+                                7 => Some(bar::THREE_QUATERS),
+                                8 => Some(bar::FULL),
+                                _ => None,
+                            }
+                        })
+                        .collect::<String>();
+                    buf.set_string(margin, margin, &line);
+                }
+                None => {}
+            }
+        }
+        buf
+    }
+
+    fn widget_type(&self) -> WidgetType {
+        WidgetType::Sparkline
+    }
+}