hkkb

A keymap editor for the HHKB Professional on Linux — what PFU's Windows/Mac-only tool does, but in your browser. It reads and rewrites the keyboard over its own USB-HID protocol; no firmware patching.

Run

./run.sh                 # then open http://127.0.0.1:8080
./run.sh -port 9000      # different port

Needs Go (standard library only) and a browser. The first run installs a udev rule with one sudo prompt — GROUP="input" on the keyboard's /dev/hidraw* — so your user, in the input group, can open it without root. Later runs just build and serve.

Use

Pick a key, then a keycode, then Write. The Fn tab edits the Fn layer (Fn + [ → Up). Read reloads from the keyboard, Reset restores defaults, Save/Load are JSON, Key test lights up presses. Model and keymap are detected automatically on connect.

Layout

internal/hhkb/   protocol + data (no UI, no cgo)
cmd/hhkb-web/    web server + embedded UI
doc/protocol.md  the wire protocol

Protocol reverse-engineered by happy-hacking-gnu.