Add main layout view and status bar

Fix #4

src/ui/statusbar.rs

@@ -0,0 +1,78 @@
+use std::sync::Arc;
+
+use cursive::align::HAlign;
+use cursive::theme::{ColorStyle, ColorType, Color, BaseColor};
+use cursive::traits::View;
+use cursive::vec::Vec2;
+use cursive::Printer;
+use unicode_width::UnicodeWidthStr;
+
+use spotify::{PlayerStatus, Spotify};
+
+pub struct StatusBar {
+    spotify: Arc<Spotify>
+}
+
+impl StatusBar {
+    pub fn new(spotify: Arc<Spotify>) -> StatusBar {
+        StatusBar {
+            spotify: spotify
+        }
+    }
+}
+
+impl View for StatusBar {
+    fn draw(&self, printer: &Printer<'_, '_>) {
+        if printer.size.x == 0 {
+            return;
+        }
+
+        let front = ColorType::Color(Color::Dark(BaseColor::Black));
+        let back = ColorType::Color(Color::Dark(BaseColor::Green));
+        let style = ColorStyle::new(front, back);
+
+        printer.print((0, 0), &vec![' '; printer.size.x].into_iter().collect::<String>());
+        printer.with_color(style, |printer| {
+            printer.print((0, 1), &vec![' '; printer.size.x].into_iter().collect::<String>());
+        });
+
+        let state_icon = match self.spotify.get_current_status() {
+            PlayerStatus::Playing => " ▶ ",
+            PlayerStatus::Paused => " ▮▮ ",
+            PlayerStatus::Stopped => " ◼  ",
+        }.to_string();
+
+        printer.with_color(style, |printer| {
+            printer.print((0, 1), &state_icon);
+        });
+
+        if let Some(ref t) = self.spotify.get_current_track() {
+            let name = format!("{} - {}",
+                t.artists.iter().map(|ref artist| artist.name.clone()).collect::<Vec<String>>().join(", "),
+                t.name).to_string();
+
+            let minutes = t.duration_ms / 60000;
+            let seconds = (t.duration_ms % 60000) / 1000;
+            let formatted_duration = format!("{:02}:{:02}", minutes, seconds);
+
+            let elapsed = self.spotify.get_current_progress();
+            let formatted_elapsed = format!("{:02}:{:02}", elapsed.as_secs() / 60, elapsed.as_secs() % 60);
+
+            let duration = format!("{} / {} ", formatted_elapsed, formatted_duration);
+            let offset = HAlign::Right.get_offset(duration.width(), printer.size.x);
+
+            printer.with_color(style, |printer| {
+                printer.print((4, 1), &name);
+                printer.print((offset, 1), &duration);
+            });
+
+            printer.with_color(ColorStyle::new(back, front), |printer| {
+                printer.print_hline((0, 0), (((printer.size.x as u32) * (elapsed.as_millis() as u32)) / t.duration_ms) as usize, "=")
+            });
+        }
+    }
+
+    fn required_size(&mut self, constraint: Vec2) -> Vec2 {
+        Vec2::new(constraint.x, 2)
+    }
+}