Ryan Malloy
650c732a30
Ports two FreeRouting building blocks for session output: - indent.py: IndentWriter (2-space indented S-expression output) and Identifier (reserved-char/non-ASCII/leading-digit quoting), mirroring datastructures/IndentFileWriter and IdentifierType. The SES reserved set includes '-' and '_', so net and padstack names get quoted. - model.py: RoutedWire/RoutedVia/RoutedNet/RoutingResult — the minimal in-memory routing structure the maze router will populate and the SES writer serializes. Coordinates are in DSN units.
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.