Add keymap-drawer workflow

I haven't tuned the output. For now this is just a demonstration of the
workflow.

.envrc

@@ -3,4 +3,6 @@ export DIRENV_LOG_FORMAT=$'\033[2mdirenv: %s\033[0m'
 
 # Use flake
 use flake
-watch_file keymap_drawer.nix
+
+# Watch additional files
+watch_file draw/default.nix

.gitignore

@@ -5,3 +5,6 @@
 modules
 firmware
 zmk
+# Ignore keymap-drawer output for now
+draw/base.svg
+draw/base.yaml

Justfile

@@ -4,6 +4,7 @@ default:
 config := absolute_path('config')
 build := absolute_path('.build')
 out := absolute_path('firmware')
+draw := absolute_path('draw')
 
 # parse combos.dtsi and adjust settings to not run out of slots
 _parse_combos:
@@ -75,6 +76,13 @@ clean:
 clean-nix:
     nix-collect-garbage --delete-old
 
+# parse & plot keymap
+draw:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    keymap -c "{{ draw }}/config.yaml" parse -z "{{ config }}/base.keymap" >"{{ draw }}/base.yaml"
+    keymap -c "{{ draw }}/config.yaml" draw "{{ draw }}/base.yaml" -k "ferris/sweep" >"{{ draw }}/base.svg"
+
 # initialize west
 init:
     west init -l config

draw/config.yaml

@@ -0,0 +1,8 @@
+parse_config:
+  zmk_preamble: "#include <zmk-helpers/key-labels/34.h>"
+  zmk_additional_includes:
+    - "modules/helpers/include"
+
+draw_config:
+  footer_text: "urob/zmk-config"
+  dark_mode: auto

flake.nix

@@ -19,7 +19,7 @@
     devShells = forAllSystems (system: let
       pkgs = nixpkgs.legacyPackages.${system};
       zephyr = zephyr-nix.packages.${system};
-      keymap_drawer = pkgs.python3Packages.callPackage ./keymap_drawer.nix { };
+      keymap_drawer = pkgs.python3Packages.callPackage ./draw { };
 
     in {
       default = pkgs.mkShell {

readme.md

@@ -31,7 +31,7 @@ compatible with Zephyr 3.0 is available
 - nix-based [local build environment](#local-development-workspace) -- simply
   `cd` into your workspace and start building without any setup
 
-![](img/keymap.png)
+![](draw/keymap.png)
 
 ## Timeless homerow mods
 
@@ -359,6 +359,14 @@ pristine build can be triggered with `just build all -p`.
 (For this particular example, there is also a `just clean` recipe, which clears
 the build cache. To list all available recipes, type `just`.)
 
+#### Drawing the keymap
+
+The build environment packages
+[keymap-drawer](https://github.com/caksoylar/keymap-drawer). `just draw` parses
+`base.keymap` and draws it to `draw/base.svg`. I haven't gotten around to
+tweaking the output yet, so for now this is just a demonstration of how to set
+things up.
+
 #### Hacking the firmware
 
 To make changes to the ZMK source or any of the modules, simply edit the files