grafatui 0.1.8

A Grafana-like TUI for Prometheus
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

/*
 * Copyright 2025 Federico D'Ambrosio
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

use crate::app::{AppState, PanelState};
use ratatui::{
    prelude::*,
    widgets::{Block, Borders, Paragraph, Sparkline},
};

pub(super) fn render_stat(frame: &mut Frame, area: Rect, p: &PanelState, app: &AppState) {
    let theme = &app.theme;

    let visible_series = p.series.iter().find(|s| s.visible);
    let value = visible_series.and_then(|s| s.value);
    let color = value
        .and_then(|value| p.get_color_for_value(value))
        .unwrap_or(theme.palette[0]);

    // Split area into value (top) and sparkline (bottom)
    let chunks = Layout::default()
        .direction(Direction::Vertical)
        .constraints([Constraint::Percentage(60), Constraint::Percentage(40)])
        .split(area);

    // A visible series with a null value should use Grafana's noValue text,
    // while no visible series at all remains Grafatui's existing "No data" state.
    let val_str = visible_series
        .map(|_| p.display.format_value(value))
        .unwrap_or_else(|| "No data".to_string());
    let big_value = Paragraph::new(val_str)
        .style(Style::default().fg(color).add_modifier(Modifier::BOLD))
        .alignment(Alignment::Center)
        .block(Block::default().borders(Borders::NONE));

    frame.render_widget(big_value, chunks[0]);

    // Render Sparkline
    if let Some(s) = visible_series {
        let data: Vec<u64> = s.points.iter().map(|(_, v)| *v as u64).collect();
        let sparkline = Sparkline::default()
            .block(Block::default().borders(Borders::NONE))
            .data(&data)
            .style(Style::default().fg(color));
        frame.render_widget(sparkline, chunks[1]);
    }
}