plotext-financial-chart

# Plotext Financial Chart Skill

Create ASCII financial line charts for GitHub Flavored Markdown using plotext with dot marker (`•`). Pure text output — renders correctly on GitHub, terminals, and all monospace environments.

**Analogy**: `graph-easy` is for flowcharts. `plotext` with dot marker is for financial line charts.

## When to Use This Skill

- Adding price path / line chart diagrams to markdown documentation
- Visualizing trading concepts (barriers, thresholds, entry/exit levels)
- Any GFM markdown file needing financial data visualization
- User mentions "financial chart", "line chart", "price chart", "plotext", or "trading chart"

**NOT for**: Flowcharts or architecture diagrams — use `graph-easy` for those.

## Preflight Check

### All-in-One Preflight Script

```bash
/usr/bin/env bash << 'PREFLIGHT_EOF'
python3 --version &>/dev/null || { echo "ERROR: Python 3 not found"; exit 1; }
if command -v uv &>/dev/null; then PM="uv pip"
elif command -v pip3 &>/dev/null; then PM="pip3"
else echo "ERROR: Neither uv nor pip3 found"; exit 1; fi
python3 -c "import plotext" 2>/dev/null || { echo "Installing plotext via $PM..."; $PM install plotext; }
python3 -c "
import plotext as plt, re
plt.clear_figure()
plt.plot([1,2,3], [1,2,3], marker='dot')
plt.plotsize(20, 5)
plt.theme('clear')
output = re.sub(r'\x1b\[[0-9;]*m', '', plt.build())
assert '•' in output
" && echo "✓ plotext ready (dot marker verified)"
PREFLIGHT_EOF
```

## Quick Start

```python
import re
import plotext as plt

x = list(range(20))
y = [97, 98, 100, 101, 100, 98, 100, 101, 102, 101,
     100, 98, 100, 101, 102, 103, 102, 101, 100, 100]

plt.clear_figure()
plt.plot(x, y, marker="dot", label="Price path")
plt.hline(103)    # Upper barrier
plt.hline(97)     # Lower barrier
plt.hline(100)    # Entry price
plt.title("Triple Barrier Method")
plt.xlabel("Time (bars)")
plt.ylabel("Price")
plt.plotsize(65, 22)
plt.theme("clear")
print(re.sub(r'\x1b\[[0-9;]*m', '', plt.build()))
```

## Mandatory Settings