Solar MPPT Power System

#!/usr/bin/env python3
"""Remove same-net vias drilled on top of each other.

Vias are placed by several passes that do not see each other's output --
routing, stitching, thermal-pad filling, pour stitching, hand-routing -- and
two of them can land within a drill diameter on the same net. Electrically
that is harmless, which is why it survives every net-based check; mechanically
it is two overlapping holes, which a fab will either query or break a drill
on. KiCad reports it as hole_to_hole, actual 0.0000mm.
"""
import math, re, sys

PCB = ("/mnt/c/Users/kirkt/Documents/mppt-power-system-mcu/"
       "mppt-power-system-mcu.kicad_pcb")
MIN_SEP = 0.30          # mm between drill centres, comfortably over the rule


def main(path=PCB):
    text = open(path, errors="replace").read()
    pat = re.compile(r'\t\(via\n(?:[^\n]*\n)*?\t\)\n')
    keep, dropped = [], 0
    seen = []
    out = []
    pos = 0
    for m in pat.finditer(text):
        blk = m.group(0)
        at = re.search(r'\(at ([-\d.]+) ([-\d.]+)\)', blk)
        net = re.search(r'\(net (?:\d+ )?"?([^")\n]*)"?\)', blk)
        if not at:
            continue
        x, y = float(at.group(1)), float(at.group(2))
        n = net.group(1) if net else ""
        dup = any(nn == n and math.hypot(x - sx, y - sy) < MIN_SEP
                  for sx, sy, nn in seen)
        if dup:
            out.append(text[pos:m.start()])
            pos = m.end()
            dropped += 1
        else:
            seen.append((x, y, n))
    out.append(text[pos:])
    if dropped:
        with open(path, "w") as fh:
            fh.write("".join(out))
    print(f"removed {dropped} duplicate via(s) ({len(seen)} kept)")
    return 0


if __name__ == "__main__":
    sys.exit(main())