Proposal: Terminal charts library (charm-charts)

[junhinhow]

Problem

Building dashboards and data visualizations in Bubble Tea requires either:

• External libraries (termui, ntcharts) that don't integrate with lipgloss styling
• Manual Unicode block character manipulation
• No official solution from the Charm ecosystem

With the rise of CLI dashboards (lazydocker, k9s, btop), there's clear demand for chart components.

Proposed Solution

charm-charts — terminal chart components styled with lipgloss.

Sparkline

data := []float64{4, 2, 7, 3, 8, 5, 9, 1, 6}
spark := charmcharts.NewSparkline(data).
    Width(30).Height(3).
    Style(lipgloss.NewStyle().Foreground(lipgloss.Color("212")))
// ▃▁▆▂▇▄█ ▅

Bar Chart

chart := charmcharts.NewBarChart(labels, values).
    Width(50).Horizontal().
    BarStyle(lipgloss.NewStyle().Foreground(lipgloss.Color("99")))
//     Go ████████████████████ 85.0
//   Rust ████████████████     72.0
// Python ████████████████████████ 95.0

Progress Bar

bar := charmcharts.NewProgressBar(0.73).Width(30).Label("Upload")
// Upload ██████████████████████░░░░░░░░  73%

Features

• Sparkline — 1-8 row height, auto-scaling, data resampling
• Bar Chart — horizontal/vertical, labels, value display
• Progress Bar — custom fill/empty chars, percentage display
• Fluent builder API, lipgloss styling, charm-themes integration

Working POC

https://github.com/junhinhow/charm-charts

Bilingual docs (EN/PT-BR).

Questions

1. Would charts fit as a bubbles component or standalone package?
2. Interest in a Bubble Tea `Model` variant for real-time updating charts?
3. Should pie charts and line charts be added?