Show a timeline of git tag dates

list_tags.sh

git for-each-ref --format="%(refname:short) %(creatordate:iso8601)" refs/tags > tags.txt

plot_tags.py

import matplotlib.pyplot as plt
from datetime import datetime

# Sample data
with open("tags.txt", "r") as file:
    lines = file.readlines()

# Transform each line
tags = [
    (f"{parts[1]}T{parts[2]}{parts[3][0:3]}:{parts[3][3:]}", parts[0])
    for line in lines if (parts := line.split())
]

# Process data
dates = [datetime.fromisoformat(tag[0]) for tag in tags]
labels = [tag[1] for tag in tags]

# Plot
plt.figure(figsize=(10, 1))
plt.hlines(1, min(dates), max(dates), colors='lightgray', linewidth=2)  # Base line
plt.scatter(dates, [1] * len(dates), color='blue', zorder=5)  # Points

# Add labels
for date, label in zip(dates, labels):
    plt.text(date, 1.002, label, rotation=90, ha='center', fontsize=9)



plt.gca().get_yaxis().set_visible(False)  # Hide Y-axis
plt.xlabel("Time")
plt.tight_layout()
plt.show()