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.

Self-Evolving Skill: This skill improves through use. If instructions are wrong, parameters drifted, or a workaround was needed — fix this file immediately, don't defer. Only update for real, reproducible issues.

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.

Preflight Check

All-in-One Preflight Script

/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

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()))