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bal-docs/tools/make_placeholders.py
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tools
2026-07-29 22:39:42 -04:00

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#!/usr/bin/env python3
"""Generate a visible placeholder for every screenshot listed in screenshots.yml
that does not yet exist in docs/img/.
Real screenshots are never overwritten: drop the real PNG in docs/img/ with the
manifest filename and this script will simply skip it.
Usage:
python3 tools/make_placeholders.py # fill in what's missing
python3 tools/make_placeholders.py --list # show what is still missing
python3 tools/make_placeholders.py --force # redraw ALL placeholders
# (never touches real screenshots
# unless they are placeholders)
"""
import sys
from pathlib import Path
try:
import yaml
except ImportError:
sys.exit("Missing dependency: pip install pyyaml")
from PIL import Image, ImageDraw
ROOT = Path(__file__).resolve().parent.parent
MANIFEST = ROOT / "screenshots.yml"
IMG_DIR = ROOT / "docs" / "img"
W, H = 1280, 720
BG = (238, 241, 244) # --bal-bg #eef1f4
FG = (91, 102, 114) # --bal-muted #5b6672
ACCENT = (45, 108, 223) # --bal-accent #2d6cdf
# Backgrounds ever used by this script — lets --force recognise its own output
# (including older revisions) without ever touching a real screenshot.
KNOWN_PLACEHOLDER_BGS = {BG, (241, 243, 245)}
def draw_placeholder(path: Path, name: str, shows: str) -> None:
img = Image.new("RGB", (W, H), BG)
d = ImageDraw.Draw(img)
d.rectangle([8, 8, W - 8, H - 8], outline=ACCENT, width=4)
d.text((48, H // 2 - 60), "SCREENSHOT NEEDED", fill=ACCENT)
d.text((48, H // 2 - 20), f"file: docs/img/{name}", fill=FG)
d.text((48, H // 2 + 10), f"shows: {shows}", fill=FG)
d.text((48, H - 60), "Replace this file with the real screenshot (same filename).", fill=FG)
img.save(path)
def is_placeholder(path: Path) -> bool:
"""A placeholder is exactly W x H with our flat background colour."""
try:
with Image.open(path) as im:
return im.size == (W, H) and im.convert("RGB").getpixel((2, 2)) in KNOWN_PLACEHOLDER_BGS
except Exception:
return False
def main() -> None:
manifest = yaml.safe_load(MANIFEST.read_text(encoding="utf-8"))
IMG_DIR.mkdir(parents=True, exist_ok=True)
missing, created = [], 0
for item in manifest["screenshots"]:
target = IMG_DIR / item["file"]
if target.exists() and not ("--force" in sys.argv and is_placeholder(target)):
continue
missing.append(item)
if "--list" not in sys.argv:
draw_placeholder(target, item["file"], item.get("shows", ""))
created += 1
if "--list" in sys.argv:
if not missing:
print("All screenshots present.")
else:
print(f"{len(missing)} screenshot(s) still missing:")
for m in missing:
print(f" - {m['file']:38s} ({m.get('page','')}) — {m.get('shows','')}")
else:
print(f"{created} placeholder(s) generated, {len(manifest['screenshots']) - created} real image(s) already in place.")
if __name__ == "__main__":
main()