Vendor ratatui temporarily (#835)

* Vendor ratatui temporarily

Once https://github.com/tui-rs-revival/ratatui/pull/114 has been merged,
we can undo this! But otherwise we can't publish to crates.io with a git
dependency.

* make tests pass

* Shush.

* these literally just fail in nix, nowhere else

idk how to work with nix properly, and they're also not our tests

1 files changed, 219 insertions, 0 deletions

diff --git a/src/ratatui/widgets/barchart.rs b/src/ratatui/widgets/barchart.rs
new file mode 100644
index 00000000..13f386a4
--- /dev/null
+++ b/src/ratatui/widgets/barchart.rs
@@ -0,0 +1,219 @@
+use crate::ratatui::{
+    buffer::Buffer,
+    layout::Rect,
+    style::Style,
+    symbols,
+    widgets::{Block, Widget},
+};
+use std::cmp::min;
+use unicode_width::UnicodeWidthStr;
+
+/// Display multiple bars in a single widgets
+///
+/// # Examples
+///
+/// ```
+/// # use ratatui::widgets::{Block, Borders, BarChart};
+/// # use ratatui::style::{Style, Color, Modifier};
+/// BarChart::default()
+///     .block(Block::default().title("BarChart").borders(Borders::ALL))
+///     .bar_width(3)
+///     .bar_gap(1)
+///     .bar_style(Style::default().fg(Color::Yellow).bg(Color::Red))
+///     .value_style(Style::default().fg(Color::Red).add_modifier(Modifier::BOLD))
+///     .label_style(Style::default().fg(Color::White))
+///     .data(&[("B0", 0), ("B1", 2), ("B2", 4), ("B3", 3)])
+///     .max(4);
+/// ```
+#[derive(Debug, Clone)]
+pub struct BarChart<'a> {
+    /// Block to wrap the widget in
+    block: Option<Block<'a>>,
+    /// The width of each bar
+    bar_width: u16,
+    /// The gap between each bar
+    bar_gap: u16,
+    /// Set of symbols used to display the data
+    bar_set: symbols::bar::Set,
+    /// Style of the bars
+    bar_style: Style,
+    /// Style of the values printed at the bottom of each bar
+    value_style: Style,
+    /// Style of the labels printed under each bar
+    label_style: Style,
+    /// Style for the widget
+    style: Style,
+    /// Slice of (label, value) pair to plot on the chart
+    data: &'a [(&'a str, u64)],
+    /// Value necessary for a bar to reach the maximum height (if no value is specified,
+    /// the maximum value in the data is taken as reference)
+    max: Option<u64>,
+    /// Values to display on the bar (computed when the data is passed to the widget)
+    values: Vec<String>,
+}
+
+impl<'a> Default for BarChart<'a> {
+    fn default() -> BarChart<'a> {
+        BarChart {
+            block: None,
+            max: None,
+            data: &[],
+            values: Vec::new(),
+            bar_style: Style::default(),
+            bar_width: 1,
+            bar_gap: 1,
+            bar_set: symbols::bar::NINE_LEVELS,
+            value_style: Default::default(),
+            label_style: Default::default(),
+            style: Default::default(),
+        }
+    }
+}
+
+impl<'a> BarChart<'a> {
+    pub fn data(mut self, data: &'a [(&'a str, u64)]) -> BarChart<'a> {
+        self.data = data;
+        self.values = Vec::with_capacity(self.data.len());
+        for &(_, v) in self.data {
+            self.values.push(format!("{}", v));
+        }
+        self
+    }
+
+    pub fn block(mut self, block: Block<'a>) -> BarChart<'a> {
+        self.block = Some(block);
+        self
+    }
+
+    pub fn max(mut self, max: u64) -> BarChart<'a> {
+        self.max = Some(max);
+        self
+    }
+
+    pub fn bar_style(mut self, style: Style) -> BarChart<'a> {
+        self.bar_style = style;
+        self
+    }
+
+    pub fn bar_width(mut self, width: u16) -> BarChart<'a> {
+        self.bar_width = width;
+        self
+    }
+
+    pub fn bar_gap(mut self, gap: u16) -> BarChart<'a> {
+        self.bar_gap = gap;
+        self
+    }
+
+    pub fn bar_set(mut self, bar_set: symbols::bar::Set) -> BarChart<'a> {
+        self.bar_set = bar_set;
+        self
+    }
+
+    pub fn value_style(mut self, style: Style) -> BarChart<'a> {
+        self.value_style = style;
+        self
+    }
+
+    pub fn label_style(mut self, style: Style) -> BarChart<'a> {
+        self.label_style = style;
+        self
+    }
+
+    pub fn style(mut self, style: Style) -> BarChart<'a> {
+        self.style = style;
+        self
+    }
+}
+
+impl<'a> Widget for BarChart<'a> {
+    fn render(mut self, area: Rect, buf: &mut Buffer) {
+        buf.set_style(area, self.style);
+
+        let chart_area = match self.block.take() {
+            Some(b) => {
+                let inner_area = b.inner(area);
+                b.render(area, buf);
+                inner_area
+            }
+            None => area,
+        };
+
+        if chart_area.height < 2 {
+            return;
+        }
+
+        let max = self
+            .max
+            .unwrap_or_else(|| self.data.iter().map(|t| t.1).max().unwrap_or_default());
+        let max_index = min(
+            (chart_area.width / (self.bar_width + self.bar_gap)) as usize,
+            self.data.len(),
+        );
+        let mut data = self
+            .data
+            .iter()
+            .take(max_index)
+            .map(|&(l, v)| {
+                (
+                    l,
+                    v * u64::from(chart_area.height - 1) * 8 / std::cmp::max(max, 1),
+                )
+            })
+            .collect::<Vec<(&str, u64)>>();
+        for j in (0..chart_area.height - 1).rev() {
+            for (i, d) in data.iter_mut().enumerate() {
+                let symbol = match d.1 {
+                    0 => self.bar_set.empty,
+                    1 => self.bar_set.one_eighth,
+                    2 => self.bar_set.one_quarter,
+                    3 => self.bar_set.three_eighths,
+                    4 => self.bar_set.half,
+                    5 => self.bar_set.five_eighths,
+                    6 => self.bar_set.three_quarters,
+                    7 => self.bar_set.seven_eighths,
+                    _ => self.bar_set.full,
+                };
+
+                for x in 0..self.bar_width {
+                    buf.get_mut(
+                        chart_area.left() + i as u16 * (self.bar_width + self.bar_gap) + x,
+                        chart_area.top() + j,
+                    )
+                    .set_symbol(symbol)
+                    .set_style(self.bar_style);
+                }
+
+                if d.1 > 8 {
+                    d.1 -= 8;
+                } else {
+                    d.1 = 0;
+                }
+            }
+        }
+
+        for (i, &(label, value)) in self.data.iter().take(max_index).enumerate() {
+            if value != 0 {
+                let value_label = &self.values[i];
+                let width = value_label.width() as u16;
+                if width < self.bar_width {
+                    buf.set_string(
+                        chart_area.left()
+                            + i as u16 * (self.bar_width + self.bar_gap)
+                            + (self.bar_width - width) / 2,
+                        chart_area.bottom() - 2,
+                        value_label,
+                        self.value_style,
+                    );
+                }
+            }
+            buf.set_stringn(
+                chart_area.left() + i as u16 * (self.bar_width + self.bar_gap),
+                chart_area.bottom() - 1,
+                label,
+                self.bar_width as usize,
+                self.label_style,
+            );
+        }
+    }
+}