Ryan Malloy
e58f63e0f1
Adds shove_needed.dsn: one signal layer (no vias), where NET_A routes as a straight wall that boxes NET_C out under greedy ordering. Tests assert the contrast: without shove NET_C is dropped (result still DRC-clean, just incomplete); with shove NET_A is moved aside and both nets connect, the exact has_violation check is clean, endpoints stay on pads, and the result is deterministic. Regression tests confirm shove is a no-op on the simple/ crossing/ripup/kicad boards (same connectivity, DRC-clean, zero shoves). Oracle-gated parity is included (skips when the JAR cannot route the synthetic single-layer board).
freeroute
A native Python PCB autorouter — a Java-free port of the FreeRouting engine.
Why
kicad-mcp currently autoroutes by shelling out to freerouting.jar, which
drags in a JVM dependency. freeroute reimplements the routing engine in
pure Python so the toolchain needs no Java at all.
The contract
The entire integration surface is two Specctra files:
board.dsn ──▶ freeroute ──▶ board.ses
(unrouted) (routed session: traces + vias)
kicad-cli already exports .dsn and imports .ses, so freeroute is a
drop-in replacement for the JAR step — nothing else in the pipeline changes.
Status
Pre-alpha. Under active development. See docs/PORTING_PLAN.md
for the architecture and porting roadmap.
Usage (target)
freeroute board.dsn -o board.ses
Development
uv sync
uv run pytest
uv run ruff check src/ tests/
License
GPL-3.0-or-later, matching the FreeRouting source it is ported from.