#!/usr/bin/env python3
"""Generate OpenCADStudio-branded GitHub star-history SVG charts."""
from __future__ import annotations
import argparse
import json
import math
import os
import re
import urllib.request
from datetime import datetime, timedelta, timezone
from pathlib import Path
from xml.sax.saxutils import escape
API_VERSION = "2026-03-10"
WIDTH = 960
HEIGHT = 380
PLOT_LEFT = 72
PLOT_RIGHT = 928
PLOT_TOP = 82
PLOT_BOTTOM = 326
THEMES = {
"light": {
"background": "#ffffff",
"border": "#dbe3ef",
"grid": "#dbe3ef",
"text": "#0f172a",
"muted": "#64748b",
"line": "#0284c7",
"area": "#38bdf8",
"point": "#0369a1",
},
"dark": {
"background": "#0b1220",
"border": "#263449",
"grid": "#263449",
"text": "#e5edf7",
"muted": "#94a3b8",
"line": "#38bdf8",
"area": "#0ea5e9",
"point": "#7dd3fc",
},
}
def next_link(header: str | None) -> str | None:
if not header:
return None
for item in header.split(","):
match = re.match(r'\s*<([^>]+)>;\s*rel="([^"]+)"', item)
if match and match.group(2) == "next":
return match.group(1)
return None
def fetch_star_dates(repository: str, token: str | None) -> list[datetime]:
url = f"https://api.github.com/repos/{repository}/stargazers?per_page=100"
headers = {
"Accept": "application/vnd.github.star+json",
"User-Agent": "OpenCADStudio-star-history",
"X-GitHub-Api-Version": API_VERSION,
}
if token:
headers["Authorization"] = f"Bearer {token}"
dates: list[datetime] = []
for _ in range(100):
request = urllib.request.Request(url, headers=headers)
with urllib.request.urlopen(request, timeout=30) as response:
payload = json.load(response)
link = response.headers.get("Link")
for entry in payload:
value = entry.get("starred_at")
if value:
dates.append(datetime.fromisoformat(value.replace("Z", "+00:00")))
url = next_link(link)
if not url:
break
else:
raise RuntimeError("stargazer pagination exceeded 100 pages")
if not dates:
raise RuntimeError("GitHub returned no dated stargazers")
dates.sort()
return dates
def nice_axis(stars: int) -> tuple[int, int]:
rough_step = max(stars / 5, 1)
magnitude = 10 ** math.floor(math.log10(rough_step))
step = magnitude
for multiplier in (1, 2, 5, 10):
candidate = multiplier * magnitude
if candidate >= rough_step:
step = candidate
break
top = math.ceil(stars / step) * step
if top <= stars:
top += step
return int(top), int(step)
def render_svg(repository: str, dates: list[datetime], theme: str) -> str:
colors = THEMES[theme]
now = datetime.now(timezone.utc)
start = dates[0] - timedelta(days=2)
end = max(now, dates[-1] + timedelta(days=2))
duration = max((end - start).total_seconds(), 1)
plot_width = PLOT_RIGHT - PLOT_LEFT
plot_height = PLOT_BOTTOM - PLOT_TOP
y_top, y_step = nice_axis(len(dates))
def x_position(moment: datetime) -> float:
ratio = (moment - start).total_seconds() / duration
return PLOT_LEFT + ratio * plot_width
def y_position(stars: int) -> float:
return PLOT_BOTTOM - (stars / y_top) * plot_height
line_parts = [f"M {PLOT_LEFT:.1f} {PLOT_BOTTOM:.1f}"]
for count, moment in enumerate(dates, 1):
line_parts.append(f"H {x_position(moment):.1f} V {y_position(count):.1f}")
line_path = " ".join(line_parts)
area_path = f"{line_path} V {PLOT_BOTTOM:.1f} H {PLOT_LEFT:.1f} Z"
grid = []
for value in range(0, y_top + 1, y_step):
y = y_position(value)
grid.append(
f''
)
grid.append(
f'{value}'
)
x_labels = []
for index in range(5):
moment = start + (end - start) * (index / 4)
x = x_position(moment)
if index in (0, 4):
label = moment.strftime("%b %Y")
else:
label = moment.strftime("%b")
x_labels.append(
f''
)
x_labels.append(
f'{escape(label)}'
)
title = f"{repository.split('/')[-1]} Star History"
subtitle = f"{len(dates)} GitHub stars ยท Updated {now:%d %b %Y}"
last_x = x_position(dates[-1])
last_y = y_position(len(dates))
label_y = max(PLOT_TOP + 16, last_y - 14)
return f'''
'''
def main() -> None:
parser = argparse.ArgumentParser()
parser.add_argument(
"--repository",
default=os.environ.get("GITHUB_REPOSITORY", "HakanSeven12/OpenCADStudio"),
)
parser.add_argument("--output-dir", type=Path, default=Path("dist"))
args = parser.parse_args()
token = os.environ.get("GITHUB_TOKEN") or os.environ.get("GH_TOKEN")
dates = fetch_star_dates(args.repository, token)
args.output_dir.mkdir(parents=True, exist_ok=True)
for theme in THEMES:
output = args.output_dir / f"star-history-{theme}.svg"
output.write_text(render_svg(args.repository, dates, theme), encoding="utf-8")
print(f"star history: {len(dates)} stars")
if __name__ == "__main__":
main()