Also resize pty

README.md

@@ -0,0 +1,60 @@
+# multiview-rs
+
+*Run many commands and watch all outputs in a single terminal*
+
+![multiview preview](/screenshots/row-major.png)
+
+## Installation
+
+If rust is not already installed, [install rust](https://www.rust-lang.org/tools/install).
+
+Then run:
+
+```sh
+cargo install --git https://gitea.tforgione.fr/tforgione/multiview
+```
+
+## Usage
+
+Split your terminal in two rows, the first containing three columns, and the second containing one column:
+```sh
+multiview cmd1 :: cmd2 :: cmd3 // cmd4 :: cmd5
+```
+
+![multiview row major preview](/screenshots/row-major.png)
+
+Split your terminal in two columns, the first containing three rows, and the second containing one row:
+```sh
+multiview cmd1 // cmd2 // cmd3 :: cmd4 // cmd5
+```
+
+![multiview col major preview](/screenshots/col-major.png)
+
+## Colors
+
+Most well written programs will disable colors when running from multiview, in order to force them to use colors, you
+can use the `unbuffer` command from the [`expect` package](https://packages.ubuntu.com/search?keywords=expect).
+
+```sh
+multiview unbuffer cmd1 :: unbuffer cmd2
+```
+
+## Shortcuts
+
+  - `k`: kills the current tile
+  - `K`: kills all tiles
+  - `r`: restarts the current tile
+  - `R`: restarts all tiles
+  - `l`: draw a line on the current tile
+  - `L`: draw a line on all tiles
+  - `q`: quits
+
+## History
+
+This is my attempt to rewrite [arjunmehta's multiview](https://github.com/arjunmehta/multiview) in rust.
+
+Their version has many features that I don't use, but is missing a few things that I need:
+  - line wrapping: when a line is bigger than the terminal size, the end is just not displayed
+  - scroll: if your output has more lines than your terminal height, there is no way (to my knowledge) to scroll up
+
+

examples/demo2.sh

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
+echo -en "0"
 for i in `seq 1 100`; do
-    sleep 0.05s
+    sleep 0.005s
     echo -en "\n$i"
 done

examples/demo3.sh

@@ -1,9 +1,8 @@
 #!/usr/bin/env bash
 
-width=$(stty size | cut -d ' ' -f 2)
-
 for c in a b c d  e f g h i j k l m n o p q r s t u v w x y z A B C D  E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9; do
-for i in `seq 1 $width`; do
+for i in `seq 1 $(stty size | cut -d ' ' -f 2)`; do
     echo -n $c
 done
+sleep 2s
 done

src/lib.rs

@@ -10,10 +10,12 @@ use termion::screen::IntoAlternateScreen;
 use termion::terminal_size;
 use termion::{clear, cursor};
 
+use tile::{Tile, TileBuilder};
+
 pub mod tile;
 pub mod utils;
 
-use tile::{Tile, TileBuilder};
+const DELAY: Duration = Duration::from_millis(20);
 
 /// Multiple applications running in a single terminal.
 struct Multiview<W: Write> {
@@ -29,6 +31,9 @@ struct Multiview<W: Write> {
     /// Whether we need to refresh the UI.
     pub refresh_ui: bool,
 
+    /// Whether we need to refresh the tiles.
+    pub refresh_tiles: bool,
+
     /// Last time when the rendering was performed.
     pub last_render: Instant,
 }
@@ -41,6 +46,7 @@ impl<W: Write> Multiview<W> {
             tiles,
             selected: (0, 0),
             refresh_ui: true,
+            refresh_tiles: false,
             last_render: Instant::now(),
         };
 
@@ -68,11 +74,17 @@ impl<W: Write> Multiview<W> {
     }
 
     /// Sets the selected tile from (x, y) coordinates.
-    pub fn select_tile(&mut self, (x, y): (u16, u16), term_size: (u16, u16)) {
-        let w = term_size.0 / self.tiles[0].len() as u16;
-        let h = term_size.1 / self.tiles.len() as u16;
-
-        self.selected = (y / h, x / w);
+    pub fn select_tile(&mut self, (x, y): (u16, u16)) {
+        // Ugly but working
+        for (i, row) in self.tiles.iter().enumerate() {
+            for (j, tile) in row.iter().enumerate() {
+                if tile.outer_position.0 <= x && x < tile.outer_position.0 + tile.outer_size.0 {
+                    if tile.outer_position.1 <= y && y < tile.outer_position.1 + tile.outer_size.1 {
+                        self.selected = (i as u16, j as u16);
+                    }
+                }
+            }
+        }
         self.refresh_ui = true;
     }
 
@@ -85,21 +97,31 @@ impl<W: Write> Multiview<W> {
     /// Renders the (x, y) tile.
     pub fn render_tile_content(&mut self, (i, j): (u16, u16)) -> String {
         let tile = self.tile((i, j));
-        tile.render_content()
+        tile.render_content(self.selected == (i, j))
     }
 
     /// Renders all the tiles of the multiview.
-    pub fn render(&mut self) -> io::Result<()> {
-        // let now = Instant::now();
+    pub fn render(&mut self, force: bool) -> io::Result<()> {
+        if !self.refresh_tiles {
+            return Ok(());
+        }
 
-        // if now.duration_since(self.last_render) < Duration::from_millis(20) {
-        //     return Ok(());
-        // }
+        let now = Instant::now();
+
+        if now.duration_since(self.last_render) < DELAY && !force {
+            return Ok(());
+        }
+
+        self.last_render = now;
+
+        let mut buffer = if self.refresh_ui {
+            vec![format!("{}", clear::All)]
+        } else {
+            vec![]
+        };
 
-        // self.last_render = now;
-        let mut buffer = vec![];
         for i in 0..self.tiles.len() {
-            for j in 0..self.tiles[0].len() {
+            for j in 0..self.tiles[i].len() {
                 if self.refresh_ui {
                     buffer.push(self.render_tile_border((i as u16, j as u16)));
                 }
@@ -108,6 +130,7 @@ impl<W: Write> Multiview<W> {
         }
 
         self.refresh_ui = false;
+        self.refresh_tiles = false;
         write!(self.stdout, "{}", buffer.join(""))?;
         self.stdout.flush()?;
 
@@ -115,15 +138,15 @@ impl<W: Write> Multiview<W> {
     }
 
     /// Scrolls down the current selected tile.
-    pub fn scroll_down(&mut self) {
+    pub fn scroll_down(&mut self, step: isize) {
         let tile = self.tile_mut(self.selected);
-        tile.scroll_down();
+        tile.scroll_down(step);
     }
 
     /// Scrolls up the current selected tile.
-    pub fn scroll_up(&mut self) {
+    pub fn scroll_up(&mut self, step: isize) {
         let tile = self.tile_mut(self.selected);
-        tile.scroll_up();
+        tile.scroll_up(step);
     }
 
     /// Scrolls down to the bottom of the current selected tile.
@@ -150,37 +173,54 @@ impl<W: Write> Multiview<W> {
     }
 
     /// Restarts the selected tile.
-    pub fn restart(&mut self) -> io::Result<()> {
+    pub fn restart(&mut self) {
         let tile = self.tile_mut(self.selected);
-        tile.restart()
+        tile.restart();
     }
 
     /// Restarts all tiles.
-    pub fn restart_all(&mut self) -> io::Result<()> {
+    pub fn restart_all(&mut self) {
         for row in &mut self.tiles {
             for tile in row {
-                tile.restart()?;
+                tile.restart();
             }
         }
-
-        Ok(())
     }
 
     /// Kills the selected tile.
-    pub fn kill(&mut self) -> io::Result<()> {
+    pub fn kill(&mut self) {
         let tile = self.tile_mut(self.selected);
-        tile.kill()
+        tile.kill();
     }
 
     /// Kills all tiles.
-    pub fn kill_all(&mut self) -> io::Result<()> {
+    pub fn kill_all(&mut self) {
         for row in &mut self.tiles {
             for tile in row {
-                tile.kill()?;
+                tile.kill();
             }
         }
+    }
 
-        Ok(())
+    /// Adds a line to the current tile.
+    pub fn add_line(&mut self) {
+        let tile = self.tile_mut(self.selected);
+        tile.add_line();
+    }
+
+    /// Adds a line to every tile.
+    pub fn add_line_all(&mut self) {
+        for row in &mut self.tiles {
+            for tile in row {
+                tile.add_line();
+            }
+        }
+    }
+
+    /// Adds a finish line to the specified tile.
+    pub fn add_finish_line(&mut self, coords: (u16, u16), success: bool) {
+        let tile = self.tile_mut(coords);
+        tile.add_finish_line(success);
     }
 
     /// Exits.
@@ -189,10 +229,35 @@ impl<W: Write> Multiview<W> {
 
         for row in &mut self.tiles {
             for tile in row {
-                tile.kill().ok();
+                tile.kill()
             }
         }
     }
+
+    /// Treats a message.
+    pub fn manage_msg(&mut self, msg: Msg) -> io::Result<()> {
+        self.refresh_tiles = true;
+
+        match msg {
+            Msg::Stdout(coords, line) => self.push_stdout(coords, line),
+            Msg::Stderr(coords, line) => self.push_stderr(coords, line),
+            Msg::Click(x, y) => self.select_tile((x, y)),
+            Msg::Restart => self.restart(),
+            Msg::RestartAll => self.restart_all(),
+            Msg::Kill => self.kill(),
+            Msg::KillAll => self.kill_all(),
+            Msg::ScrollDown(step) => self.scroll_down(step),
+            Msg::ScrollUp(step) => self.scroll_up(step),
+            Msg::ScrollFullDown => self.scroll_full_down(),
+            Msg::ScrollFullUp => self.scroll_full_up(),
+            Msg::AddLine => self.add_line(),
+            Msg::AddLineAll => self.add_line_all(),
+            Msg::AddFinishLine(coords, success) => self.add_finish_line(coords, success),
+            Msg::Exit => self.exit(),
+        }
+
+        Ok(())
+    }
 }
 
 impl<W: Write> Drop for Multiview<W> {
@@ -202,6 +267,7 @@ impl<W: Write> Drop for Multiview<W> {
 }
 
 /// An event that can be sent in channels.
+#[derive(PartialEq, Eq)]
 pub enum Msg {
     /// An stdout line arrived.
     Stdout((u16, u16), String),
@@ -225,10 +291,10 @@ pub enum Msg {
     KillAll,
 
     /// Scroll up one line.
-    ScrollUp,
+    ScrollUp(isize),
 
     /// Scroll down one line.
-    ScrollDown,
+    ScrollDown(isize),
 
     /// Scroll to the top of the log.
     ScrollFullUp,
@@ -236,6 +302,15 @@ pub enum Msg {
     /// Scroll to the bottom of the log.
     ScrollFullDown,
 
+    /// Adds a line to the current tile.
+    AddLine,
+
+    /// Adds a line to every tile.
+    AddLineAll,
+
+    /// Adds the finish line to the tile.
+    AddFinishLine((u16, u16), bool),
+
     /// The program was asked to exit.
     Exit,
 }
@@ -246,9 +321,33 @@ pub fn main() -> io::Result<()> {
 
     let args = env::args().skip(1).collect::<Vec<_>>();
 
+    let mut is_row_major = true;
+
+    for arg in &args {
+        if arg == "//" {
+            is_row_major = false;
+            break;
+        }
+
+        if arg == "::" {
+            is_row_major = true;
+            break;
+        }
+    }
+
+    let (first_split, second_split) = if is_row_major {
+        ("//", "::")
+    } else {
+        ("::", "//")
+    };
+
     let tiles = args
-        .split(|x| x == "//")
-        .map(|x| x.split(|y| y == "::").enumerate().collect::<Vec<_>>())
+        .split(|x| x == first_split)
+        .map(|x| {
+            x.split(|y| y == second_split)
+                .enumerate()
+                .collect::<Vec<_>>()
+        })
         .enumerate()
         .map(|(i, tiles)| {
             tiles
@@ -258,22 +357,29 @@ pub fn main() -> io::Result<()> {
         })
         .collect::<Vec<_>>();
 
-    let term_size = terminal_size()?;
+    let mut term_size = terminal_size()?;
 
-    let tile_size = (
-        term_size.0 / tiles[0].len() as u16,
-        term_size.1 / tiles.len() as u16,
-    );
+    let col_len = tiles.len() as u16;
 
     let tiles = tiles
         .into_iter()
         .map(|row| {
+            let row_len = row.len() as u16;
+
+            let tile_size = if is_row_major {
+                (term_size.0 / row_len, term_size.1 / col_len)
+            } else {
+                (term_size.0 / col_len, term_size.1 / row_len)
+            };
+
             row.into_iter()
                 .map(|((i, j), tile)| {
+                    let (p_i, p_j) = if is_row_major { (i, j) } else { (j, i) };
+
                     TileBuilder::new()
                         .command(tile.into())
                         .coords((i as u16, j as u16))
-                        .position((j as u16 * tile_size.0 + 1, i as u16 * tile_size.1 + 1))
+                        .position((p_j as u16 * tile_size.0 + 1, p_i as u16 * tile_size.1 + 1))
                         .size(tile_size)
                         .sender(sender.clone())
                         .build()
@@ -289,7 +395,7 @@ pub fn main() -> io::Result<()> {
     let stdout = MouseTerminal::from(stdout);
 
     let mut multiview = Multiview::new(stdout, tiles)?;
-    multiview.render()?;
+    multiview.render(true)?;
 
     for row in &mut multiview.tiles {
         for tile in row {
@@ -306,13 +412,15 @@ pub fn main() -> io::Result<()> {
                 Event::Key(Key::Char('R')) => sender.send(Msg::RestartAll).unwrap(),
                 Event::Key(Key::Char('k')) => sender.send(Msg::Kill).unwrap(),
                 Event::Key(Key::Char('K')) => sender.send(Msg::KillAll).unwrap(),
-                Event::Key(Key::Down) => sender.send(Msg::ScrollDown).unwrap(),
-                Event::Key(Key::Up) => sender.send(Msg::ScrollUp).unwrap(),
+                Event::Key(Key::Char('l')) => sender.send(Msg::AddLine).unwrap(),
+                Event::Key(Key::Char('L')) => sender.send(Msg::AddLineAll).unwrap(),
+                Event::Key(Key::Down) => sender.send(Msg::ScrollDown(1)).unwrap(),
+                Event::Key(Key::Up) => sender.send(Msg::ScrollUp(1)).unwrap(),
                 Event::Key(Key::End) => sender.send(Msg::ScrollFullDown).unwrap(),
                 Event::Key(Key::Home) => sender.send(Msg::ScrollFullUp).unwrap(),
                 Event::Mouse(MouseEvent::Press(p, x, y)) => match p {
-                    MouseButton::WheelUp => sender.send(Msg::ScrollUp).unwrap(),
-                    MouseButton::WheelDown => sender.send(Msg::ScrollDown).unwrap(),
+                    MouseButton::WheelUp => sender.send(Msg::ScrollUp(3)).unwrap(),
+                    MouseButton::WheelDown => sender.send(Msg::ScrollDown(3)).unwrap(),
                     MouseButton::Left => sender.send(Msg::Click(x, y)).unwrap(),
                     _ => (),
                 },
@@ -323,26 +431,40 @@ pub fn main() -> io::Result<()> {
     });
 
     loop {
-        match receiver.recv() {
-            Ok(Msg::Stdout(coords, line)) => multiview.push_stdout(coords, line),
-            Ok(Msg::Stderr(coords, line)) => multiview.push_stderr(coords, line),
-            Ok(Msg::Click(x, y)) => multiview.select_tile((x, y), term_size),
-            Ok(Msg::ScrollDown) => multiview.scroll_down(),
-            Ok(Msg::Restart) => multiview.restart()?,
-            Ok(Msg::RestartAll) => multiview.restart_all()?,
-            Ok(Msg::Kill) => multiview.kill()?,
-            Ok(Msg::KillAll) => multiview.kill_all()?,
-            Ok(Msg::ScrollUp) => multiview.scroll_up(),
-            Ok(Msg::ScrollFullDown) => multiview.scroll_full_down(),
-            Ok(Msg::ScrollFullUp) => multiview.scroll_full_up(),
-            Ok(Msg::Exit) => {
-                multiview.exit();
+        if let Ok(msg) = receiver.recv_timeout(DELAY) {
+            let is_exit = msg == Msg::Exit;
+            multiview.manage_msg(msg)?;
+            if is_exit {
                 break;
             }
-            Err(_) => (),
         }
 
-        multiview.render()?;
+        let new_term_size = terminal_size()?;
+
+        if term_size != new_term_size {
+            term_size = new_term_size;
+
+            for (i, row) in multiview.tiles.iter_mut().enumerate() {
+                let row_len = row.len() as u16;
+
+                let tile_size = if is_row_major {
+                    (term_size.0 / row_len, term_size.1 / col_len)
+                } else {
+                    (term_size.0 / col_len, term_size.1 / row_len)
+                };
+
+                for (j, tile) in row.iter_mut().enumerate() {
+                    let (p_i, p_j) = if is_row_major { (i, j) } else { (j, i) };
+                    tile.reposition((p_j as u16 * tile_size.0 + 1, p_i as u16 * tile_size.1 + 1));
+                    tile.resize(tile_size);
+                }
+            }
+
+            multiview.refresh_tiles = true;
+            multiview.refresh_ui = true;
+        }
+
+        multiview.render(false)?;
     }
 
     Ok(())

src/tile.rs

@@ -1,7 +1,7 @@
 //! This module contains everything related to tiles.
 
-use std::io::{self, Read};
-use std::process::{Child, Stdio};
+use std::io::Read;
+use std::process::Stdio;
 use std::sync::mpsc::Sender;
 use std::thread;
 
@@ -96,7 +96,8 @@ impl TileBuilder {
             scroll: 0,
             counting: true,
             column_number: 0,
-            child: None,
+            pty: None,
+            sticky: true,
         })
     }
 }
@@ -140,8 +141,11 @@ pub struct Tile {
     /// The number of the current column.
     pub column_number: u16,
 
-    /// The PTY and the child process of the command running in the tile.
-    pub child: Option<(Pty, Child)>,
+    /// The PTY of the command running in the tile.
+    pub pty: Option<Pty>,
+
+    /// Whether the tile should autoscroll.
+    pub sticky: bool,
 }
 
 impl Tile {
@@ -161,12 +165,44 @@ impl Tile {
         let pty = Pty::new().unwrap();
         pty.resize(pty_process::Size::new(size.1, size.0)).unwrap();
 
-        let mut child = Command::new(&clone[0])
+        let child = Command::new(&clone[0])
             .args(&clone[1..])
             .stdout(Stdio::piped())
             .stderr(Stdio::piped())
-            .spawn(&pty.pts().unwrap())
-            .unwrap();
+            .spawn(&pty.pts().unwrap());
+
+        let mut child = match child {
+            Ok(c) => c,
+            Err(e) => {
+                let exit_string = format!(
+                    "{}{}Couldn't run command: {}\r{}",
+                    style::Bold,
+                    color::Red.fg_str(),
+                    e,
+                    style::Reset,
+                );
+
+                sender.send(Msg::Stdout(coords, exit_string)).unwrap();
+
+                let mut line = String::new();
+                for _ in 0..size.0 - 1 {
+                    line.push('─');
+                }
+
+                sender
+                    .send(Msg::Stdout(
+                        coords,
+                        format!(
+                            "\n{}{}{}\n",
+                            color::Red.fg_str(),
+                            line,
+                            color::Reset.fg_str()
+                        ),
+                    ))
+                    .unwrap();
+                return;
+            }
+        };
 
         let mut stdout = child.stdout.take().unwrap();
         let mut stderr = child.stderr.take().unwrap();
@@ -195,33 +231,41 @@ impl Tile {
                 }
             }
 
+            let code = child.wait().unwrap().code();
+
             sender
                 .send(Msg::Stdout(coords, String::from("\n")))
                 .unwrap();
 
-            let code = 0;
-
-            let exit_string = format!(
-                "{}{}Command exited with return code {}\r{}",
-                style::Bold,
-                if code == 0 {
-                    color::Green.fg_str()
-                } else {
-                    color::Red.fg_str()
-                },
-                code,
-                style::Reset,
-            );
+            let exit_string = match code {
+                Some(0) => format!(
+                    "{}{}Command finished successfully\r{}",
+                    style::Bold,
+                    color::Green.fg_str(),
+                    style::Reset,
+                ),
+                Some(x) => {
+                    format!(
+                        "{}{}Command failed with exit code {}\r{}",
+                        style::Bold,
+                        color::Red.fg_str(),
+                        x,
+                        style::Reset,
+                    )
+                }
+                None => {
+                    format!(
+                        "{}{}Command was interrupted\r{}",
+                        style::Bold,
+                        color::Red.fg_str(),
+                        style::Reset,
+                    )
+                }
+            };
 
             sender.send(Msg::Stdout(coords, exit_string)).unwrap();
-
-            let mut line = String::new();
-            for _ in 0..size.0 - 1 {
-                line.push('─');
-            }
-
             sender
-                .send(Msg::Stdout(coords, format!("\n{}\n", line)))
+                .send(Msg::AddFinishLine(coords, code == Some(0)))
                 .unwrap();
         });
 
@@ -245,7 +289,7 @@ impl Tile {
             }
         });
 
-        self.child = Some((pty, child));
+        self.pty = Some(pty);
     }
 
     /// Push content into the stdout of the tile.
@@ -275,7 +319,7 @@ impl Tile {
 
                     if self.counting && !is_variation_selector {
                         self.column_number += 1;
-                        if self.column_number == self.inner_size.0 + 1 {
+                        if self.column_number == self.inner_size.0 {
                             self.stdout.push(String::new());
                             self.column_number = 0;
                         }
@@ -289,9 +333,8 @@ impl Tile {
         }
 
         // Autoscroll whene content arrives on stdout
-        self.scroll = self.stdout.len() as isize - 1 - (self.inner_size.1 as isize);
-        if self.scroll < 0 {
-            self.scroll = 0;
+        if self.sticky {
+            self.scroll = self.max_scroll();
         }
     }
 
@@ -346,7 +389,7 @@ impl Tile {
     }
 
     /// Renders the content of the tile.
-    pub fn render_content(&self) -> String {
+    pub fn render_content(&self, selected: bool) -> String {
         const DELETE_CHAR: char = ' ';
 
         let (x, y) = self.inner_position;
@@ -448,8 +491,6 @@ impl Tile {
                     }
                     buffer.push(spaces);
 
-                    eprintln!("Clear {}", max_char_index);
-
                     line_index += 1;
                     current_char_index = 0;
                     max_char_index = 0;
@@ -499,60 +540,171 @@ impl Tile {
             }
         }
 
-        let mut spaces = format!(
-            "{}",
-            cursor::Goto(x + max_char_index, y + last_line_index as u16 - scroll)
-        );
+        if last_line_index as u16 - scroll <= h {
+            let mut spaces = format!(
+                "{}",
+                cursor::Goto(x + max_char_index, y + last_line_index as u16 - scroll)
+            );
 
-        for _ in max_char_index..w {
-            spaces.push(DELETE_CHAR);
+            for _ in max_char_index..w {
+                spaces.push(DELETE_CHAR);
+            }
+            buffer.push(spaces);
+        }
+
+        // Render scrollbar,thanks @gdamms
+        // I have no idea what this code does, I copied/pasted it from gdamms, and then modified
+        // some stuff so that it would look right
+        if last_line_index > h {
+            let mut subbuffer = vec![];
+            subbuffer.push(format!(
+                "{}{}{}{}",
+                style::Reset,
+                if selected { color::Green.fg_str() } else { "" },
+                cursor::Goto(x + w + 1, y),
+                "▲"
+            ));
+
+            let bar_portion = h as f32 / self.stdout.len() as f32;
+            let bar_nb = f32::max(1.0, (bar_portion * (h) as f32).round()) as u16;
+            let max_scroll = self.stdout.len() as isize - h as isize - 1;
+
+            let (scroll_nb_bottom, scroll_nb_top) = if self.scroll > max_scroll / 2 {
+                let scroll_nb_bottom = (self.stdout.len() as isize - self.scroll) as u16 - h;
+                let scroll_nb_bottom = scroll_nb_bottom as f32 / self.stdout.len() as f32;
+                let scroll_nb_bottom = (scroll_nb_bottom * (h as f32)).ceil() as u16;
+                let scroll_nb_top = h - bar_nb - scroll_nb_bottom;
+                (scroll_nb_bottom, scroll_nb_top)
+            } else {
+                let scroll_nb_top = self.scroll as f32 / self.stdout.len() as f32;
+                let scroll_nb_top = (scroll_nb_top * (h) as f32).ceil() as u16;
+                let scroll_nb_bottom = h - bar_nb - scroll_nb_top;
+                (scroll_nb_bottom, scroll_nb_top)
+            };
+
+            for i in 1..=scroll_nb_top {
+                subbuffer.push(format!("{}{}", cursor::Goto(x + w + 1, y + i), "│"));
+            }
+            for i in scroll_nb_top + 1..=scroll_nb_top + bar_nb {
+                subbuffer.push(format!("{}{}", cursor::Goto(x + w + 1, y + i), "█"));
+            }
+            for i in scroll_nb_top + bar_nb + 1..=scroll_nb_top + bar_nb + scroll_nb_bottom {
+                subbuffer.push(format!("{}{}", cursor::Goto(x + w + 1, y + i), "│"));
+            }
+
+            subbuffer.push(format!("{}{}", cursor::Goto(x + w + 1, y + h), "▼"));
+
+            buffer.push(subbuffer.join(""));
         }
-        buffer.push(spaces);
 
         buffer.push(format!("{}", style::Reset));
         buffer.join("")
     }
 
+    /// Returns the max scroll value.
+    pub fn max_scroll(&self) -> isize {
+        std::cmp::max(
+            0,
+            self.stdout.len() as isize - self.inner_size.1 as isize - 1,
+        )
+    }
+
     /// Scrolls up one line.
-    pub fn scroll_up(&mut self) {
-        if self.scroll > 0 {
-            self.scroll -= 1;
-        }
+    pub fn scroll_up(&mut self, step: isize) {
+        self.sticky = false;
+        self.scroll = std::cmp::max(0, self.scroll - step);
     }
 
     /// Scrolls down one line.
-    pub fn scroll_down(&mut self) {
-        if self.scroll + (self.inner_size.1 as isize) < self.stdout.len() as isize - 1 {
-            self.scroll += 1;
+    pub fn scroll_down(&mut self, step: isize) {
+        let max_scroll = self.max_scroll();
+        self.scroll = std::cmp::min(max_scroll, self.scroll + step);
+        if self.scroll == max_scroll {
+            self.sticky = true;
         }
     }
 
     /// Scrolls up one line.
     pub fn scroll_full_up(&mut self) {
+        self.sticky = false;
         self.scroll = 0;
     }
 
     /// Scrolls down one line.
     pub fn scroll_full_down(&mut self) {
-        self.scroll = self.stdout.len() as isize - self.inner_size.1 as isize - 1;
-        if self.scroll < 0 {
-            self.scroll = 0;
-        }
+        self.sticky = true;
+        self.scroll = self.max_scroll()
     }
 
     /// Kill the child command.
-    pub fn kill(&mut self) -> io::Result<()> {
-        if let Some((_, child)) = self.child.as_mut() {
-            child.kill()?;
-        }
-
-        Ok(())
+    pub fn kill(&mut self) {
+        self.pty = None;
     }
 
     /// Restarts the child command.
-    pub fn restart(&mut self) -> io::Result<()> {
-        self.kill()?;
+    pub fn restart(&mut self) {
+        self.kill();
         self.start();
-        Ok(())
+    }
+
+    /// Repositions the tile.
+    pub fn reposition(&mut self, (i, j): (u16, u16)) {
+        self.outer_position = (i, j);
+        self.inner_position = (i + 2, j + 3);
+    }
+
+    /// Resizes the tile.
+    pub fn resize(&mut self, (w, h): (u16, u16)) {
+        self.outer_size = (w, h);
+        self.inner_size = (w - 4, h - 5);
+
+        if let Some(pty) = self.pty.as_mut() {
+            pty.resize(pty_process::Size::new(self.inner_size.1, self.inner_size.0))
+                .unwrap();
+        }
+
+        let old_stdout = std::mem::replace(&mut self.stdout, vec![String::new()]);
+        for s in old_stdout {
+            self.push_stdout(s);
+        }
+    }
+
+    /// Draws a line.
+    pub fn add_line(&mut self) {
+        let mut line = String::new();
+        for _ in 0..self.inner_size.0 - 1 {
+            line.push('─');
+        }
+
+        self.sender
+            .send(Msg::Stdout(
+                self.coords,
+                format!("\n{}{}\n", color::Reset.fg_str(), line),
+            ))
+            .unwrap();
+    }
+
+    /// Draws a finish line, green if success or red if failure.
+    pub fn add_finish_line(&mut self, success: bool) {
+        let mut line = String::new();
+        for _ in 0..self.inner_size.0 - 1 {
+            line.push('─');
+        }
+
+        self.sender
+            .send(Msg::Stdout(
+                self.coords,
+                format!(
+                    "\n{}{}{}\n",
+                    color::Reset.fg_str(),
+                    if success {
+                        color::Green.fg_str()
+                    } else {
+                        color::Red.fg_str()
+                    },
+                    line
+                ),
+            ))
+            .unwrap();
     }
 }