85 lines
3.0 KiB
Python
85 lines
3.0 KiB
Python
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#!/usr/bin/env python3
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"""Normalize a third-party SVG mark onto the Archipelago app-icon canvas.
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Store tiles render icons as-is — there is deliberately no runtime inset
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(it would double-margin every icon that already ships whitespace), so the
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margin must be baked into the file. House icons carry it naturally;
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third-party marks are usually full-bleed (Alby Hub's tile icon was the
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first to land edge-to-edge in the store, 2026-08-14). This wraps any SVG
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in a square canvas with a uniform inner margin, preserving the original
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untouched as a nested <svg>.
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Usage:
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scripts/normalize-app-icon.py in.svg out.svg [--margin 0.12]
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Margin is a fraction of the canvas per side (default 12%, the house look).
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"""
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import argparse
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import re
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import sys
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def main() -> int:
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ap = argparse.ArgumentParser()
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ap.add_argument("src")
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ap.add_argument("dst")
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ap.add_argument("--margin", type=float, default=0.12,
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help="inner margin per side, fraction of canvas (default 0.12)")
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args = ap.parse_args()
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svg = open(args.src, encoding="utf-8").read()
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m = re.search(r"<svg\b[^>]*>", svg, re.S)
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if not m:
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print("error: no <svg> root element found", file=sys.stderr)
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return 1
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root = m.group(0)
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vb = re.search(r'viewBox\s*=\s*["\']([\d.eE+\s,-]+)["\']', root)
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if vb:
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nums = [float(x) for x in re.split(r"[\s,]+", vb.group(1).strip())]
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if len(nums) != 4:
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print("error: unparseable viewBox", file=sys.stderr)
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return 1
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_, _, w, h = nums
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inner_viewbox = vb.group(1).strip()
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else:
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wm = re.search(r'width\s*=\s*["\']([\d.]+)', root)
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hm = re.search(r'height\s*=\s*["\']([\d.]+)', root)
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if not (wm and hm):
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print("error: no viewBox and no width/height to derive one", file=sys.stderr)
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return 1
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w, h = float(wm.group(1)), float(hm.group(1))
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inner_viewbox = f"0 0 {w} {h}"
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# Square canvas fitting the larger dimension; the mark centers in it.
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side = max(w, h)
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canvas = 100.0
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margin = canvas * args.margin
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avail = canvas - 2 * margin
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scale_w = avail * (w / side)
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scale_h = avail * (h / side)
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x = (canvas - scale_w) / 2
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y = (canvas - scale_h) / 2
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# Strip any XML prolog from the original; it nests inside the wrapper.
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inner = re.sub(r"^\s*<\?xml[^>]*\?>\s*", "", svg)
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out = (
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f'<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 {canvas:g} {canvas:g}">\n'
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f' <!-- normalized by scripts/normalize-app-icon.py: margin={args.margin:g} per side -->\n'
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f' <svg x="{x:.3f}" y="{y:.3f}" width="{scale_w:.3f}" height="{scale_h:.3f}" '
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f'viewBox="{inner_viewbox}" preserveAspectRatio="xMidYMid meet">\n'
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f'{inner}\n'
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f' </svg>\n'
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f'</svg>\n'
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)
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open(args.dst, "w", encoding="utf-8").write(out)
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print(f"wrote {args.dst}: {canvas:g}x{canvas:g} canvas, mark {scale_w:.1f}x{scale_h:.1f} at {args.margin:.0%} margin")
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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