diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
new file mode 100644
index 0000000..e637f8c
--- /dev/null
+++ b/.github/workflows/check.yml
@@ -0,0 +1,146 @@
+name: Check code quality
+
+on:
+  push:
+    branches: [ main, develop ]
+    paths:
+      - 'keymap/**'
+      - 'QMK'
+      - 'shell.nix'
+      - '.github/workflows/check.yml'
+  workflow_dispatch: {}
+
+jobs:
+  check:
+    name: Check code quality
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+          path: ./repo
+
+      - name: Set up Nix
+        uses: cachix/install-nix-action@v15
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            experimental-features = nix-command
+
+      - name: Set up cache
+        uses: cachix/cachix-action@v10
+        with:
+          name: kip93
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+          extraPullNames: nix-community
+          skipPush: true
+
+      - name: Print nixpkgs version
+        run: |
+          nix-instantiate --eval -E '"nixpkgs version: ${(import <nixpkgs> {}).lib.version}"'
+
+      - name: Shellcheck shell.nix
+        id: shellcheck
+        working-directory: ./repo
+        run: |
+          (
+            printf '#!/bin/bash\n' ;
+            nix-shell --pure shell.nix --run : >/dev/null ;
+            nix-instantiate shell.nix 2>/dev/null | xargs -i sed '1,5d' {} ;
+          ) | nix-shell -p shellcheck --run 'shellcheck -'
+        continue-on-error: true
+
+      - name: QMK Format
+        id: qmk-format
+        working-directory: ./repo
+        run: |
+          nix-shell --run format
+          git diff --exit-code --name-only
+        continue-on-error: true
+
+      - name: QMK Lint
+        id: qmk-lint
+        working-directory: ./repo
+        run: |
+          nix-shell --run lint
+        continue-on-error: true
+
+      - name: Check shell.nix format
+        id: nixpkgs-fmt
+        working-directory: ./repo
+        run: |
+          nix-shell -p nixpkgs-fmt --run 'nixpkgs-fmt --check shell.nix'
+        continue-on-error: true
+
+      - name: Lint shell.nix
+        id: nix-linter
+        working-directory: ./repo
+        run: |
+          nix-shell -p nix-linter --run ' \
+            nix-linter -W no-AlphabeticalArgs \
+                       -W no-AlphabeticalBindings \
+                       -W BetaReduction \
+                       -W DIYInherit \
+                       -W EmptyInherit \
+                       -W EmptyLet \
+                       -W no-EmptyVariadicParamSet \
+                       -W FreeLetInFunc \
+                       -W LetInInheritRecset \
+                       -W no-ListLiteralConcat \
+                       -W NegateAtom \
+                       -W SequentialLet \
+                       -W SetLiteralUpdate \
+                       -W UnfortunateArgName \
+                       -W no-UnneededAntiquote \
+                       -W UnneededRec \
+                       -W UnusedArg \
+                       -W UnusedLetBind \
+                       -W UpdateEmptySet \
+                       -v shell.nix \
+          '
+        continue-on-error: true
+
+      - name: Check shell.nix for vulnerabilities
+        id: vulnix
+        working-directory: ./repo
+        run: |
+          nix-shell -p vulnix --run 'vulnix -f shell.nix'
+        continue-on-error: true
+
+      - name: Validate shell.nix logic
+        id: validate
+        working-directory: .
+        run: |
+          (
+            mkdir -p ./tmp ;
+            cp ./repo/shell.nix ./tmp/shell.nix ;
+            sed -i -E 's|\bKEYBOARD\b\s*=\s*".+?"\s*;|KEYBOARD = "ergodox_ez";|' ./tmp/shell.nix ;
+            cd ./tmp ;
+            MANPAGER=cat nix-shell --run help ;
+            nix-shell --pure --run init ;
+            # nix-shell --pure --run setup ;  # No root access, but not needed since we won't be flashing
+            nix-shell --pure --run format ;
+            nix-shell --pure --run lint ;
+            nix-shell --pure --run compile ;
+            # nix-shell --pure --run flash ;  # Can't flash since there is no keyboard attached
+            nix-shell --pure --run clean ;
+          )
+        continue-on-error: true
+
+      - name: Check for failures
+        if: |
+          steps.shellcheck.outcome  != 'success' ||
+          steps.qmk-format.outcome  != 'success' ||
+          steps.qmk-lint.outcome    != 'success' ||
+          steps.nixpkgs-fmt.outcome != 'success' ||
+          steps.nix-linter.outcome  != 'success' ||
+          steps.vulnix.outcome      != 'success' ||
+          steps.validate.outcome    != 'success'
+        run: exit 1
+
+      - name: Push to cache
+        working-directory: ./repo
+        run: |
+          nix-shell --pure shell.nix --run :
+          nix-store -qR --include-outputs $(nix-instantiate shell.nix 2>/dev/null) | cachix push kip93
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5b79d8c..b8f158b 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,7 +1,13 @@
 name: Release
 
 on:
-  push: { branches: [ main, develop ] }
+  push:
+    branches: [ main, develop ]
+    paths:
+      - 'keymap/**'
+      - 'QMK'
+      - 'shell.nix'
+      - '.github/workflows/release.yml'
   workflow_dispatch: {}
 
 concurrency:
@@ -22,12 +28,22 @@ jobs:
         uses: cachix/install-nix-action@v15
         with:
           nix_path: nixpkgs=channel:nixos-unstable
+
+      - name: Set up cache
+        uses: cachix/cachix-action@v10
+        with:
+          name: kip93
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+          extraPullNames: nix-community
+          skipPush: true
+
       - name: Print nixpkgs version
         run: |
           nix-instantiate --eval -E '"nixpkgs version: ${(import <nixpkgs> {}).lib.version}"'
 
       - name: Compile
-        run: nix-shell --run compile
+        run: |
+          nix-shell --pure --run compile
 
       - name: Create tag
         id: tag
@@ -35,45 +51,54 @@ jobs:
           TAG="$(date '+v%y.%m.%d.%H%M%S')${{ github.ref != 'refs/heads/main' && '-RC' || '' }}"
           git tag "${TAG}"
           git push --tags
+          printf 'Tagged: %s -> %s.\n\n' "$(git rev-parse HEAD)" "${TAG}"
 
           printf '::set-output name=tag::%s\n' "${TAG}"
 
       - name: Create changelog
         run: |
-          git fetch --tags
+          printf 'Reference:\n'
+          printf '%s.\n\n' "${GITHUB_REF}"
 
-          printf 'Branch:\n'
-          printf '%s\n\n' "${GITHUB_REF_NAME}"
           printf 'Latest tags:\n'
-          git tag -l --sort=version:refname | tail -10
+          git fetch --tags
+          git tag -l --sort=-version:refname | head -10
           printf '\n'
           printf 'Latest full release tags:\n'
-          git tag -l --sort=version:refname | grep -P '^v\\d{2}\\.\\d{2}\\.\\d{2}\\.\\d{6}$' | tail -10
+          git tag -l --sort=-version:refname | grep -P '^v\d{2}\.\d{2}\.\d{2}\.\d{6}$' | head -10
           printf '\n'
 
-          printf '[Commits to %s since this release]' "${GITHUB_REF_NAME}" >>'.build/CHANGELOG.md'
-          printf '(%s/%s/compare/' "${GITHUB_SERVER_URL}" "${GITHUB_REPOSITORY}" >>'.build/CHANGELOG.md'
-          printf '%s...%s)' "${{ steps.tag.outputs.tag }}" "${GITHUB_REF_NAME}" >>'.build/CHANGELOG.md'
-          printf '\n\n' >>'.build/CHANGELOG.md'
+          printf 'Changelog:\n'
+          if [ "${GITHUB_REF_NAME}" = 'main' ] && [ "$(git tag -l | grep -P '^v\d{2}\.\d{2}\.\d{2}\.\d{6}$' | wc -l)" -ge 2 ] ; then
+            LAST_TAG="$(git tag -l --sort=-version:refname | grep -P '^v\d{2}\.\d{2}\.\d{2}\.\d{6}$' | sed -n '2{p;q;}')"
+          elif [ "$(git tag -l | wc -l)" -ge 2 ] ; then
+            LAST_TAG="$(git tag -l --sort=-version:refname | sed -n '2{p;q;}')"
+          else
+            LAST_TAG="$(git rev-list --max-parents=0 HEAD)"
+          fi
+          printf '%s...%s\n\n' "${{ steps.tag.outputs.tag }}" "${LAST_TAG}"
 
           printf '[Full changelog]' >>'.build/CHANGELOG.md'
           printf '(%s/%s/compare/' "${GITHUB_SERVER_URL}" "${GITHUB_REPOSITORY}" >>'.build/CHANGELOG.md'
-          if [ "${GITHUB_REF_NAME}" = 'main' ] && [ "$(git tag -l | grep -P '^v\\d{2}\\.\\d{2}\\.\\d{2}\\.\\d{6}$' | wc -l)" -ge 2 ] ; then
-            printf '%s...%s)' "$(git tag -l --sort=version:refname | grep -P '^v\\d{2}\\.\\d{2}\\.\\d{2}\\.\\d{6}$' | tail -2 | head -1)" "${{ steps.tag.outputs.tag }}" >>'.build/CHANGELOG.md'
-
-          elif [ "$(git tag -l | wc -l)" -ge 2 ] ; then
-            printf '%s...%s)' "$(git tag -l --sort=version:refname | tail -2 | head -1)" "${{ steps.tag.outputs.tag }}" >>'.build/CHANGELOG.md'
+          printf '%s...%s)\n\n' "${LAST_TAG}" "${{ steps.tag.outputs.tag }}" >>'.build/CHANGELOG.md'
 
-          else
-            printf '%s...%s)' "$(git rev-list --max-parents=0 HEAD)" "${{ steps.tag.outputs.tag }}" >>'.build/CHANGELOG.md'
-          fi
-          printf '\n\n' >>'.build/CHANGELOG.md'
+          printf '[Commits to %s since this release]' "${GITHUB_REF_NAME}" >>'.build/CHANGELOG.md'
+          printf '(%s/%s/compare/' "${GITHUB_SERVER_URL}" "${GITHUB_REPOSITORY}" >>'.build/CHANGELOG.md'
+          printf '%s...%s)\n\n' "${{ steps.tag.outputs.tag }}" "${GITHUB_REF_NAME}" >>'.build/CHANGELOG.md'
 
       - name: Publish release
         uses: softprops/action-gh-release@v1
         with:
           files: |
-            .build/firmware.hex
+            ./.build/firmware.hex
+          fail_on_unmatched_files: true
+          name: ${{ steps.tag.outputs.tag }}
           tag_name: ${{ steps.tag.outputs.tag }}
           body_path: .build/CHANGELOG.md
           prerelease: ${{ github.ref != 'refs/heads/main' }}
+
+      - name: Push to cache
+        run: |
+          nix-shell --pure shell.nix --run :
+          nix-shell --pure QMK/shell.nix --run :
+          nix-store -qR --include-outputs $(nix-instantiate shell.nix QMK/shell.nix 2>/dev/null) | cachix push kip93
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index bc047dd..c8bc2c1 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -1,7 +1,7 @@
 name: Update QMK
 
 on:
-  schedule: [ { cron: "42 */4 * * *" } ]
+  schedule: [ { cron: "42 * * * *" } ]  # Every hour, past 42 minutes to avoid peak times.
   workflow_dispatch: {}
 
 concurrency:
@@ -14,15 +14,46 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
-        with: { ref: "develop" }
+        with:
+          ref: develop
+          submodules: recursive
 
       - name: Update
         run: |
-          git submodule update --init --remote QMK
+          nix-shell --pure --run update
+
+      - name: Set up Nix
+        uses: cachix/install-nix-action@v15
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            experimental-features = nix-command
+
+      - name: Set up cache
+        uses: cachix/cachix-action@v10
+        with:
+          name: kip93
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+          extraPullNames: nix-community
+          skipPush: true
+
+      - name: Print nixpkgs version
+        run: |
+          nix-instantiate --eval -E '"nixpkgs version: ${(import <nixpkgs> {}).lib.version}"'
+
+      - name: Validate
+        run: |
+          nix-shell --pure --run compile
 
       - name: Commit
         run: |
           git config --global user.name 'github-actions[bot]'
           git config --global user.email 'github-actions[bot]@users.noreply.github.com'
-          git remote set-url origin "https://x-access-token:${{ github.token }}@github.com/${{ github.repository }}"
+          git remote set-url origin \
+            "https://x-access-token:${{ github.token }}@github.com/${{ github.repository }}"
           git commit -am "Update QMK - [GitHub Action]" && git push || true
+
+      - name: Push to cache
+        run: |
+          nix-shell --pure QMK/shell.nix --run :
+          nix-store -qR --include-outputs $(nix-instantiate QMK/shell.nix 2>/dev/null) | cachix push kip93
diff --git a/.vscode/ltex.dictionary.en-GB.txt b/.vscode/ltex.dictionary.en-GB.txt
index 88cd8d2..a6ac5c1 100644
--- a/.vscode/ltex.dictionary.en-GB.txt
+++ b/.vscode/ltex.dictionary.en-GB.txt
@@ -1,7 +1,13 @@
+cachix
 Corne
+github
 keycaps
 Keyhive
 keymap
 keymaps
 MCUs
+nix
+nixos
+nixpkgs
 ortholinear
+QMK
diff --git a/QMK b/QMK
index 29ab430..84c9d6f 160000
--- a/QMK
+++ b/QMK
@@ -1 +1 @@
-Subproject commit 29ab430f1f302bc64ad1549147f24235ba230a9c
+Subproject commit 84c9d6ff39b92892c385c320f3d36145d71c9095
diff --git a/keymap/config.h b/keymap/config.h
index 801b369..df40ce4 100644
--- a/keymap/config.h
+++ b/keymap/config.h
@@ -15,38 +15,52 @@
 * <http://www.gnu.org/licenses/>.                                                                               *
 \***************************************************************************************************************/
 
-# pragma once
+#pragma once
 
-
-// ------------------------------------------------ Handiness ------------------------------------------------ //
+/////////////////////////////////////////////////// Handiness ///////////////////////////////////////////////////
 // https://docs.qmk.fm/#/config_options?id=setting-handedness
 
-# define MASTER_LEFT
+#define MASTER_LEFT
 
-// --------------------------------------------------- RGB --------------------------------------------------- //
+////////////////////////////////////////////////////// RGB //////////////////////////////////////////////////////
 // https://docs.qmk.fm/#/feature_rgb_matrix
 // https://github.com/qmk/qmk_firmware/tree/master/quantum/rgb_matrix_animations/
 
-# ifdef RGB_MATRIX_ENABLE
+#ifdef RGB_MATRIX_ENABLE
+
+//////////////
+// Settings //
+//////////////
+
+// Disable lighting when suspended.
+#    define RGB_DISABLE_WHEN_USB_SUSPENDED true
+// 24 FPS animations.
+#    define RGB_MATRIX_LED_FLUSH_LIMIT (1000 / 24)
+// Limit LED effects' overhead.
+#    define RGB_MATRIX_LED_PROCESS_LIMIT (DRIVER_LED_TOTAL / 9)
+// Max brightness (uint8_t, best if <= 150).
+#    define RGB_MATRIX_MAXIMUM_BRIGHTNESS 140
+// Disable default RGB controls.
+#    define RGB_MATRIX_DISABLE_KEYCODES
+
+/////////////
+// Effects //
+/////////////
 
-// Global settings.
-#     define RGB_DISABLE_WHEN_USB_SUSPENDED  true                    // Disable lighting when suspended.
-#     define RGB_MATRIX_LED_FLUSH_LIMIT      (1000 / 24)             // 24 FPS animations.
-#     define RGB_MATRIX_LED_PROCESS_LIMIT    (DRIVER_LED_TOTAL / 9)  // Limit LED effects' overhead.
-#     define RGB_MATRIX_MAXIMUM_BRIGHTNESS   140                     // Max brightness (uint8_t, best if <= 150).
-#     define RGB_MATRIX_DISABLE_KEYCODES                             // Disable default RGB controls.
+// React to keypresses.
+#    define RGB_MATRIX_KEYPRESSES
+#    define RGB_MATRIX_KEYRELEASES
 
-// RGB effects.
-#     define RGB_MATRIX_KEYPRESSES
-#     define RGB_MATRIX_KEYRELEASES
+// Light up pressed key momentarily.
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
 
-#     define ENABLE_RGB_MATRIX_SOLID_COLOR
-#     define ENABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
+// Simple solid colour lighting.
+#    define ENABLE_RGB_MATRIX_SOLID_COLOR
 
-# endif  // RGB_MATRIX_ENABLE
+#endif // RGB_MATRIX_ENABLE
 
-// -------------------------------------------------- Others ------------------------------------------------- //
+//////////////////////////////////////////////////// Others /////////////////////////////////////////////////////
 
-# define TAPPING_TERM  150
+#define TAPPING_TERM 150
 
-# define PERMISSIVE_HOLD
+#define PERMISSIVE_HOLD
diff --git a/keymap/keymap.c b/keymap/keymap.c
index a193c96..00d78b8 100644
--- a/keymap/keymap.c
+++ b/keymap/keymap.c
@@ -18,13 +18,13 @@
 // https://docs.qmk.fm/#/keymap
 // https://docs.qmk.fm/#/keycodes
 
-# include QMK_KEYBOARD_H
-
-# include "layers.h"
-# include "macros.h"
-# include "rgb_macros.h"
+#include QMK_KEYBOARD_H
 
+#include "layers.h"
+#include "macros.h"
+#include "rgb_macros.h"
 
+// clang-format off
 const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS] PROGMEM = {
 
 ///////////////////////////////////////////////////// Typing ////////////////////////////////////////////////////
@@ -32,15 +32,15 @@ const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS] PROGMEM = {
 // ------------------------------------------------- 0: Text ------------------------------------------------- //
 
     [TYPING_0] = LAYOUT_split_3x6_3(
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,        KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSDL,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_ESC,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,        KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_APP,  KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,        KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_BSLS,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-                         KC_LSFT, LT(T1,KC_SPC), KC_LALT,     KC_LGUI, LT(T2,KC_ENT), KC_LCTL
-//                      +--------+--------------+--------+   +--------+--------------+--------+
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,     KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSDL,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_ESC,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,     KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_APP,  KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,     KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_BSLS,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+                         KC_LSFT, LT(T1,KC_SPC), KC_LALT,  KC_LGUI, LT(T2,KC_ENT), KC_LCTL
+//                      +--------+--------------+--------++--------+--------------+--------+
     ),
 
 // ----------------------------------------------- 1: Others #1 ---------------------------------------------- //
@@ -48,15 +48,15 @@ const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS] PROGMEM = {
 // - - - - - - - - - - - - - - - Functions  - - - - - - - - - - - - - - - Numpad - - - - - - - - - - - - - - - //
 
     [TYPING_1] = LAYOUT_split_3x6_3(
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_F1,   KC_F4,   KC_F7,   KC_F10,  KC_PSCR, KC_INS,      KC_NLCK, KC_P7,   KC_P8,   KC_P9,   KC_PMNS, KC_PSLS,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_F2,   KC_F5,   KC_F8,   KC_F11,  KC_HOME, KC_PGUP,     KC_PDOT, KC_P4,   KC_P5,   KC_P6,   KC_PPLS, KC_PAST,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_F3,   KC_F6,   KC_F9,   KC_F12,  KC_END,  KC_PGDN,     KC_P0,   KC_P1,   KC_P2,   KC_P3,   KC_PENT, KC_BSES,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-                               KC_TRNS, KC_TRNS, KC_TRNS,     KC_TRNS, TO(G0),  KC_TRNS
-//                            +--------+--------+--------+   +--------+--------+--------+
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_F1,   KC_F4,   KC_F7,   KC_F10,  KC_PSCR, KC_INS,   KC_NLCK, KC_P7,   KC_P8,   KC_P9,   KC_PMNS, KC_PSLS,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_F2,   KC_F5,   KC_F8,   KC_F11,  KC_HOME, KC_PGUP,  KC_PDOT, KC_P4,   KC_P5,   KC_P6,   KC_PPLS, KC_PAST,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_F3,   KC_F6,   KC_F9,   KC_F12,  KC_END,  KC_PGDN,  KC_P0,   KC_P1,   KC_P2,   KC_P3,   KC_PENT, KC_BSES,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+                               KC_TRNS, KC_TRNS, KC_TRNS,  KC_TRNS, TO(G0),  KC_TRNS
+//                            +--------+--------+--------++--------+--------+--------+
     ),
 
 // ----------------------------------------------- 2: Others #2 ---------------------------------------------- //
@@ -64,15 +64,15 @@ const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS] PROGMEM = {
 // - - - - - - - - - - - - - Numbers & symbols  - - - - - - - - - - - - - - Specials - - - - - - - - - - - - - //
 
     [TYPING_2] = LAYOUT_split_3x6_3(
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_GRV,      KC_MPRV, KC_VOLD, KC_VOLU, KC_MNXT, KC_MSTP, KC_CAPS,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS,     KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, KC_MPLY, KC_BRIU,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_CUT,  KC_COPY, KC_PSTE, KC_LBRC, KC_RBRC, KC_EQL,      KC_RGBM, KC_RGBC, KC_UNDO, KC_AGIN, KC_MUTE, KC_BRID,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-                               KC_TRNS, TO(G0),  KC_TRNS,     KC_TRNS, KC_TRNS, KC_TRNS
-//                            +--------+--------+--------+   +--------+--------+--------+
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_GRV,   KC_MPRV, KC_VOLD, KC_VOLU, KC_MNXT, KC_MSTP, KC_CAPS,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS,  KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, KC_MPLY, KC_BRIU,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_CUT,  KC_COPY, KC_PSTE, KC_LBRC, KC_RBRC, KC_EQL,   KC_RGBM, KC_RGBC, KC_UNDO, KC_AGIN, KC_MUTE, KC_BRID,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+                               KC_TRNS, TO(G0),  KC_TRNS,  KC_TRNS, KC_TRNS, KC_TRNS
+//                            +--------+--------+--------++--------+--------+--------+
     ),
 
 ///////////////////////////////////////////////////// Gaming ////////////////////////////////////////////////////
@@ -82,15 +82,15 @@ const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS] PROGMEM = {
 // - - - - - - - - - - WASD & other basics  - - - - - - - - - - - - Extended #1 (optional) - - - - - - - - - - //
 
     [GAMING_0] = LAYOUT_split_3x6_3(
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_ESC,  KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,        KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_PGUP,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_J,    KC_LSFT, KC_A,    KC_S,    KC_D,    KC_F,        KC_6,    KC_7,    KC_8,     KC_9,   KC_0,    KC_PGDN,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_M,    KC_LCTL, KC_Z,    KC_X,    KC_C,    KC_V,        KC_MINS, KC_COMM, KC_DOT,  KC_SCLN, KC_SLSH, KC_BSLS,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-                               MO(G1),  KC_LALT, KC_SPC,      KC_ENT,  KC_RALT, KC_RSFT
-//                            +--------+--------+--------+   +--------+--------+--------+
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_ESC,  KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,     KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_PGUP,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_J,    KC_LSFT, KC_A,    KC_S,    KC_D,    KC_F,     KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_PGDN,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_M,    KC_LCTL, KC_Z,    KC_X,    KC_C,    KC_V,     KC_MINS, KC_COMM, KC_DOT,  KC_SCLN, KC_SLSH, KC_BSLS,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+                               MO(G1),  KC_LALT, KC_SPC,   KC_ENT,  KC_RALT, KC_RSFT
+//                            +--------+--------+--------++--------+--------+--------+
     ),
 
 // ------------------------------------------------ 1: Extras ------------------------------------------------ //
@@ -98,22 +98,23 @@ const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS] PROGMEM = {
 // - - - - - - - - - - - More keybindings  - - - - - - - - - - -  Extended #2 (optional) - - - - - - - - - - - //
 
     [GAMING_1] = LAYOUT_split_3x6_3(
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_TRNS, KC_TRNS, KC_L,    KC_TRNS, KC_T,    KC_O,        KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_P,    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_G,        KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, KC_HOME, KC_END,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-    KC_I,    KC_TRNS, KC_B,     KC_N,   KC_H,    KC_K,        KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,
-// +--------+--------+--------+--------+--------+--------+   +--------+--------+--------+--------+--------+--------+
-                               KC_TRNS, KC_TRNS, KC_TRNS,     KC_TRNS, KC_TRNS, TO(T0)
-//                            +--------+--------+--------+   +--------+--------+--------+
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_TRNS, KC_TRNS, KC_L,    KC_TRNS, KC_T,    KC_O,     KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_P,    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_G,     KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, KC_HOME, KC_END,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+    KC_I,    KC_TRNS, KC_B,    KC_N,    KC_H,    KC_K,     KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,
+// +--------+--------+--------+--------+--------+--------++--------+--------+--------+--------+--------+--------+
+                               KC_TRNS, KC_TRNS, KC_TRNS,  KC_TRNS, KC_TRNS, TO(T0)
+//                            +--------+--------+--------++--------+--------+--------+
     ),
 };
+// clang-format on
 
-void keyboard_post_init_user (void) {
-    rgblight_enable_noeeprom();         // Enable LEDs.
-    rgb_next_colour();                  // Set colour
-    rgb_next_mode();                    // Set effect.
+void keyboard_post_init_user(void) {
+    rgblight_enable_noeeprom(); // Enable LEDs.
+    rgb_next_colour();          // Set colour
+    rgb_next_mode();            // Set effect.
 
-    rgblight_set_speed_noeeprom(0x40);  // Set speed (~1.5s).
+    rgblight_set_speed_noeeprom(0x40); // Set speed (~1.5s).
 }
diff --git a/keymap/layers.h b/keymap/layers.h
index 77bcbea..b645bc3 100644
--- a/keymap/layers.h
+++ b/keymap/layers.h
@@ -15,10 +15,10 @@
 * <http://www.gnu.org/licenses/>.                                                                               *
 \***************************************************************************************************************/
 
-# pragma once
+#pragma once
 
+////////////////////////////////////////////// Layer declarations ///////////////////////////////////////////////
 
-// Layer declarations.
 enum {
     // MODE 1: Typing
     TYPING_0 = 0,
@@ -30,7 +30,9 @@ enum {
     GAMING_1,
 };
 
-// Aliases.
+//////////////////////////////////////////////////// Aliases ////////////////////////////////////////////////////
+// Easier to put in the keymap
+
 enum {
     T0 = TYPING_0,
     T1 = TYPING_1,
diff --git a/keymap/macros.h b/keymap/macros.h
index b9437f2..e1f5421 100644
--- a/keymap/macros.h
+++ b/keymap/macros.h
@@ -17,14 +17,13 @@
 
 // https://docs.qmk.fm/#/feature_macros
 
-# pragma once
+#pragma once
 
-# include QMK_KEYBOARD_H
+#include QMK_KEYBOARD_H
+#include "rgb_macros.h"
 
-# include "rgb_macros.h"
+////////////////////////////////////////////// Macro declarations ///////////////////////////////////////////////
 
-
-// Macro declarations.
 enum {
     BACKSPACE_DELETE = SAFE_RANGE,
     BACKSPACE_ESCAPE,
@@ -32,7 +31,9 @@ enum {
     RGB_COLOUR,
 };
 
-// Aliases.
+//////////////////////////////////////////////////// Aliases ////////////////////////////////////////////////////
+// Easier to put in the keymap
+
 enum {
     KC_BSDL = BACKSPACE_DELETE,
     KC_BSES = BACKSPACE_ESCAPE,
@@ -40,10 +41,11 @@ enum {
     KC_RGBC = RGB_COLOUR,
 };
 
+/////////////////////////////////////////////// Macro definitions ///////////////////////////////////////////////
 
 void custom_modifier(keyrecord_t *record, uint8_t mask, uint16_t kc1, uint16_t kc2) {
     static bool modifiers = false;
-    if (record -> event.pressed) {
+    if (record->event.pressed) {
         modifiers = get_mods() & mask;
         register_code(modifiers ? kc2 : kc1);
 
@@ -52,7 +54,6 @@ void custom_modifier(keyrecord_t *record, uint8_t mask, uint16_t kc1, uint16_t k
     }
 }
 
-// Macro definitions.
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     switch (keycode) {
         case BACKSPACE_DELETE: {
@@ -68,7 +69,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
         }
 
         case RGB_MODE: {
-            if (record -> event.pressed) {
+            if (record->event.pressed) {
                 rgb_next_mode();
             }
 
@@ -76,7 +77,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
         }
 
         case RGB_COLOUR: {
-            if (record -> event.pressed) {
+            if (record->event.pressed) {
                 rgb_next_colour();
             }
 
diff --git a/keymap/rgb_macros.h b/keymap/rgb_macros.h
index bba5235..28752c2 100644
--- a/keymap/rgb_macros.h
+++ b/keymap/rgb_macros.h
@@ -18,31 +18,30 @@
 // https://docs.qmk.fm/#/feature_macros
 // https://docs.qmk.fm/#/feature_rgb_matrix
 
-# pragma once
+#pragma once
 
-# include QMK_KEYBOARD_H
+#include QMK_KEYBOARD_H
 
-
-void rgb_next_colour (void) {
-    static uint8_t colour = 0;
+void rgb_next_colour(void) {
+    static uint8_t       colour = 0;
     static const uint8_t hues[] = {
-        0x80,  // Cyan.
-        0xEB,  // Magenta.
-        0x03,  // Orange.
+        0x80, // Cyan.
+        0xEB, // Magenta.
+        0x03, // Orange.
 
         0x00, // White.
     };
 
-    uint8_t hue = hues[colour];
+    uint8_t hue        = hues[colour];
     uint8_t saturation = colour < sizeof(hues) - 1 ? 0xFF : 0x00;
-    uint8_t value = 0xFF;
+    uint8_t value      = 0xFF;
     rgblight_sethsv_noeeprom(hue, saturation, value);
 
     colour = (colour + 1) % sizeof(hues);
 }
 
-void rgb_next_mode (void) {
-    static uint8_t mode = 0;
+void rgb_next_mode(void) {
+    static uint8_t       mode    = 0;
     static const uint8_t modes[] = {
         RGB_MATRIX_SOLID_REACTIVE_SIMPLE,
         RGB_MATRIX_SOLID_COLOR,
diff --git a/keymap/rgb_matrix_user.inc b/keymap/rgb_matrix_user.inc
index 26bc22c..e1c0d7f 100644
--- a/keymap/rgb_matrix_user.inc
+++ b/keymap/rgb_matrix_user.inc
@@ -17,15 +17,14 @@
 
 // https://docs.qmk.fm/#/feature_rgb_matrix?id=custom-rgb-matrix-effects
 
-
 RGB_MATRIX_EFFECT(OFF)
-# ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
-    static bool OFF(effect_params_t *params) {
-        RGB_MATRIX_USE_LIMITS(led_min, led_max);
-        for (uint8_t i = led_min; i < led_max; ++i) {
-            rgb_matrix_set_color(i, 0x00, 0x00, 0x00);
-        }
-
-        return led_max < DRIVER_LED_TOTAL;
+#ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+static bool OFF(effect_params_t *params) {
+    RGB_MATRIX_USE_LIMITS(led_min, led_max);
+    for (uint8_t i = led_min; i < led_max; ++i) {
+        rgb_matrix_set_color(i, 0x00, 0x00, 0x00);
     }
-# endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+
+    return led_max < DRIVER_LED_TOTAL;
+}
+#endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
diff --git a/shell.nix b/shell.nix
index a8b7228..51519e4 100644
--- a/shell.nix
+++ b/shell.nix
@@ -15,7 +15,8 @@
 # <http://www.gnu.org/licenses/>.                                                                               #
 #################################################################################################################
 
-{ pkgs ? import <nixpkgs> {} }: let
+{ pkgs ? import <nixpkgs> { }, ... }:
+let
   #################
   # Configuration #
   #################
@@ -27,12 +28,16 @@
   # Number of threads to be used when compiling.
   PARALLEL = 16;
 
-in pkgs.mkShell {
+in
+pkgs.mkShell {
   nativeBuildInputs = with pkgs; [
-    cacert git nix openssh
+    cacert
+    git
+    nix
+    openssh
   ];
 
-  shellHook = ''
+  shellHook = with pkgs; ''
     # Bash configs #################################################################
     shopt -s histappend
     shopt -s cmdhist
@@ -45,11 +50,11 @@ in pkgs.mkShell {
     HISTFILESIZE=2000
 
     # Extra bling for some commands ################################################
-    eval "$(SHELL='${pkgs.bashInteractive}/bin/bash' '${pkgs.lesspipe}/bin/lesspipe.sh')"
-    eval "$('${pkgs.coreutils}/bin/dircolors' -b)"
+    eval "$(SHELL='${bashInteractive}/bin/bash' '${lesspipe}/bin/lesspipe.sh')"
+    eval "$('${coreutils}/bin/dircolors' -b)"
 
     # Globals ######################################################################
-    _ROOT_DIR="$('${pkgs.coreutils}/bin/pwd' -P)"
+    _ROOT_DIR='${toString ./.}'
 
     # Create a dynamic CLI prompt ##################################################
     _compute_prompt() {
@@ -57,172 +62,184 @@ in pkgs.mkShell {
       local XC=$?
       local XC_colour="$(
         if [ "''${XC}" -eq 0 ] ; then
-          '${pkgs.coreutils}/bin/printf' 10 ;
+          '${coreutils}/bin/printf' 10 ;
         elif [ "''${XC}" -lt 128 ] ; then
-          '${pkgs.coreutils}/bin/printf' 9  ;
+          '${coreutils}/bin/printf' 9  ;
         else
-          '${pkgs.coreutils}/bin/printf' 11 ;
+          '${coreutils}/bin/printf' 11 ;
         fi ;
       )"
-      local XC_PS1="\[\033[38;5;''${XC_colour}m\]$('${pkgs.coreutils}/bin/printf' '0x%02X' "''${XC}")\[\033[1m\]\[$('${pkgs.ncurses}/bin/tput' sgr0)\]"
+      local XC_PS1="\[\033[38;5;''${XC_colour}m\]$('${coreutils}/bin/printf' '0x%02X' "''${XC}")\[\033[1m\]\[$('${ncurses}/bin/tput' sgr0)\]"
 
       # Compute the path relative to the root of the project (or absolute path if outside of said folder).
       local path="$(
-        '${pkgs.coreutils}/bin/realpath' -m --relative-to="''${_ROOT_DIR}" "$('${pkgs.coreutils}/bin/pwd')"
+        '${coreutils}/bin/realpath' -m --relative-to="''${_ROOT_DIR}" "$('${coreutils}/bin/pwd')"
       )/"
-      [[ "''${path}" =~ ^\.\..+$ ]] && path="$('${pkgs.coreutils}/bin/pwd')"
+      [[ "''${path}" =~ ^\.\..+$    ]] && path="$('${coreutils}/bin/pwd')"
       [[ "''${path}" =~ ^/.+$|^\./$ ]] || path="./''${path}"
-      local path_PS1="\[\033[1;38;5;12m\]''${path}\[$('${pkgs.ncurses}/bin/tput' sgr0)\]"
+      local path_PS1="\[\033[1;38;5;12m\]''${path}\[$('${ncurses}/bin/tput' sgr0)\]"
 
       # Check the branch of the repo and its status.
       local is_git="$(
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --git-dir >/dev/null 2>&1 && \
-        [[ "$('${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --show-toplevel)" -ef "''${_ROOT_DIR}" ]] && \
-        printf true ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --git-dir >/dev/null 2>&1 &&
+          [ "$('${git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --show-toplevel)" -ef "''${_ROOT_DIR}" ] &&
+          '${coreutils}/bin/printf' true ;
       )"
       local git_status="$(
-        [[ ! -z "''${is_git}" ]] && \
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" status --porcelain ;
+        [ ! -z "''${is_git}" ] &&
+          '${git}/bin/git' -C "''${_ROOT_DIR}" status --porcelain ;
       )"
       local ref="$(
         if [ ! -z "''${is_git}" ] ; then
-          '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --abbrev-ref HEAD 2>/dev/null || true ;
+          '${git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --abbrev-ref HEAD 2>/dev/null || true ;
         else
-          '${pkgs.coreutils}/bin/printf' '<N/A>' ;
+          '${coreutils}/bin/printf' '<N/A>' ;
         fi ;
       )"
-      [[ "''${ref}" = "HEAD" ]] && ref="$(
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --short HEAD 2>/dev/null || \
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" branch --show-current ;
+      [ "''${ref}" = "HEAD" ] && ref="$(
+        '${git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --short HEAD 2>/dev/null ||
+          '${git}/bin/git' -C "''${_ROOT_DIR}" branch --show-current ;
       )"
       local ref_colour="$(
         if [ -z "''${is_git}" ] ; then
-          '${pkgs.coreutils}/bin/printf' 9  ;
+          '${coreutils}/bin/printf' 9  ;
         elif [ \
           "$(
-            '${pkgs.coreutils}/bin/printf' '%s\n' "''${git_status}" | \
-              '${pkgs.gnused}/bin/sed' '/^\s*$/d' | \
-              '${pkgs.coreutils}/bin/wc' -l ;
+            '${coreutils}/bin/printf' '%s\n' "''${git_status}" |
+              '${gnused}/bin/sed' '/^\s*$/d' |
+              '${coreutils}/bin/wc' -l ;
           )" -eq 0 \
         ] ; then
-          '${pkgs.coreutils}/bin/printf' 10 ;
+          '${coreutils}/bin/printf' 10 ;
         elif
-          '${pkgs.coreutils}/bin/printf' '%s\n' "''${git_status}" | \
-            '${pkgs.gnugrep}/bin/grep' -q '^.\S' ; then
-          '${pkgs.coreutils}/bin/printf' 9  ;
+          '${coreutils}/bin/printf' '%s\n' "''${git_status}" |
+            '${gnugrep}/bin/grep' -q '^.\S' ; then
+          '${coreutils}/bin/printf' 9  ;
         else
-          '${pkgs.coreutils}/bin/printf' 11 ;
+          '${coreutils}/bin/printf' 11 ;
         fi ;
       )"
-      local ref_PS1="\[\033[1;38;5;''${ref_colour}m\]$ref\[$('${pkgs.ncurses}/bin/tput' sgr0)\]"
+      local ref_PS1="\[\033[1;38;5;''${ref_colour}m\]$ref\[$('${ncurses}/bin/tput' sgr0)\]"
 
       # Nix shell hint.
-      local nix_PS1='\[\033[1;38;5;13m\]NIX+QMK\[$('${pkgs.ncurses}/bin/tput' sgr0)\]'
+      local nix_PS1='\[\033[1;38;5;13m\]NIX+QMK\[$('${ncurses}/bin/tput' sgr0)\]'
 
       # Colour CLI prompt.
-      PS1="\[$('${pkgs.ncurses}/bin/tput' sgr0)\][ ''${nix_PS1} @ ''${ref_PS1} : ''${path_PS1} ] ''${XC_PS1} > \[$('${pkgs.ncurses}/bin/tput' sgr0)\]"
+      PS1="\[$('${ncurses}/bin/tput' sgr0)\][ ''${nix_PS1} @ ''${ref_PS1} : ''${path_PS1} ] ''${XC_PS1} > \[$('${ncurses}/bin/tput' sgr0)\]"
 
       return "''${XC}"  # Restore the original exit code
     }
     PROMPT_COMMAND=_compute_prompt
 
     # Aliases ######################################################################
-    alias ls="'${pkgs.coreutils}/bin/ls' --color=auto"
-    alias ll="'${pkgs.coreutils}/bin/ls' --color=auto -lAh"
+    alias ls="'${coreutils}/bin/ls' --color=auto"
+    alias ll="'${coreutils}/bin/ls' --color=auto -lAh"
 
     # Commands #####################################################################
-    setup() {
+    init() {
       local XC=0
 
       (
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --git-dir >/dev/null 2>&1 && \
-        [[ "$('${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --show-toplevel)" -ef "''${_ROOT_DIR}" ]] ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --git-dir >/dev/null 2>&1 && \
+        [ "$('${git}/bin/git' -C "''${_ROOT_DIR}" rev-parse --show-toplevel)" -ef "''${_ROOT_DIR}" ] ;
       ) || (
-        '${pkgs.coreutils}/bin/printf' \
+        '${coreutils}/bin/printf' \
           '# \033[3mInitialise repo\033[0m ------------------------------------------------------------------------------------- #\n' ;
         (
-          '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" init -b main
+          '${git}/bin/git' -C "''${_ROOT_DIR}" init -b main
         ) || XC="$(( "''${XC}" + 0x01 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
+        '${coreutils}/bin/printf' '\n' ;
       )
 
-      [[ -d "''${_ROOT_DIR}/QMK/" ]] && (
-        '${pkgs.coreutils}/bin/printf' \
+      [ -d "''${_ROOT_DIR}/QMK/" ] && (
+        '${coreutils}/bin/printf' \
           '# \033[3mClean up submodule\033[0m ---------------------------------------------------------------------------------- #\n' ;
         (
-          '${pkgs.coreutils}/bin/rm' -rf -- "''${_ROOT_DIR}/QMK/" && \
-          '${pkgs.coreutils}/bin/printf' "Submodule path 'QMK': deleted\n" ;
+          '${coreutils}/bin/rm' -rf -- "''${_ROOT_DIR}/QMK/" &&
+            '${coreutils}/bin/printf' "Submodule path 'QMK': deleted\n" ;
         ) || XC="$(( "''${XC}" + 0x02 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
+        '${coreutils}/bin/printf' '\n' ;
       )
 
       (
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" config --file .gitmodules --get-regexp path | \
-          '${pkgs.gawk}/bin/awk' '{ print $2 }' | \
-          grep -q '^QMK$' ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}" config --file .gitmodules --get-regexp path |
+          '${gawk}/bin/awk' '{ print $2 }' |
+          '${gnugrep}/bin/grep' -q '^QMK$' ;
       ) || (
-        '${pkgs.coreutils}/bin/printf' \
+        '${coreutils}/bin/printf' \
           '# \033[3mAdd QMK submodule\033[0m ----------------------------------------------------------------------------------- #\n' ;
         (
-          '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" submodule add --branch master -- 'https://github.com/qmk/qmk_firmware/' QMK ;
+          '${git}/bin/git' -C "''${_ROOT_DIR}" submodule add --branch master -- 'https://github.com/qmk/qmk_firmware/' QMK ;
         ) || XC="$(( "''${XC}" + 0x04 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
+        '${coreutils}/bin/printf' '\n' ;
       )
 
-      [[ "''${XC}" -ne 0 ]] || (
-        '${pkgs.coreutils}/bin/printf' \
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
           '# \033[3mInit submodule\033[0m -------------------------------------------------------------------------------------- #\n' ;
         (
-          '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" submodule update --init --recursive --progress ;
+          '${git}/bin/git' -C "''${_ROOT_DIR}" submodule update --init --recursive --progress ;
         ) || XC="$(( "''${XC}" + 0x08 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
-      )
+        '${coreutils}/bin/printf' '\n' ;
+      fi
 
-      [[ "''${XC}" -ne 0 ]] || (
-        '${pkgs.coreutils}/bin/printf' \
-          '# \033[3mSet up udev rules\033[0m ----------------------------------------------------------------------------------- #\n' ;
-        (
-          '${pkgs.coreutils}/bin/printf' 'Set up /etc/udev/rules.d/\n' && \
-            su -c "
-              '${pkgs.coreutils}/bin/mkdir' -p '/etc/udev/rules.d/' &&
-              '${pkgs.coreutils}/bin/cp' -rf \"''${_ROOT_DIR}/QMK/util/udev/\"* '/etc/udev/rules.d/'
-            " && '${pkgs.coreutils}/bin/printf' '\n/etc/udev/rules.d/ set up successfully\n' ;
-        ) || XC="$(( "''${XC}" + 0x10 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
-      )
+      '${coreutils}/bin/printf' \
+        '# \033[3mClean up workspace\033[0m ---------------------------------------------------------------------------------- #\n' ;
+      (
+        '${coreutils}/bin/rm' -rf -- "''${_ROOT_DIR}/keymap/" ;
+      ) || XC="$(( "''${XC}" + 0x10 ))" ;
+      '${coreutils}/bin/printf' '\n' ;
 
-      '${pkgs.coreutils}/bin/printf' \
-        '# \033[3mResize /run/user/$UID\033[0m ------------------------------------------------------------------------------- #\n' ;
+      '${coreutils}/bin/printf' \
+        '# \033[3mCopy default keymap\033[0m --------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.coreutils}/bin/printf' 'Set up /etc/udev/rules.d/\n' && \
-          su -c "
-            '${pkgs.coreutils}/bin/mkdir' -p '/etc/systemd/logind.conf.d/' &&
-            '${pkgs.coreutils}/bin/printf' '[Login]\nRuntimeDirectorySize=99%%\n' >'/etc/systemd/logind.conf.d/runtime_directory_size.conf'
-          " && '${pkgs.coreutils}/bin/printf' '\n/run/user/$UID resized successfully\n' ;
+        '${coreutils}/bin/cp' -rf -- "''${_ROOT_DIR}/QMK/keyboards/${KEYBOARD}/keymaps/default" "''${_ROOT_DIR}/keymap" ;
       ) || XC="$(( "''${XC}" + 0x20 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
-
-      '${pkgs.coreutils}/bin/printf' '\033[3mSet up complete.\nPlease reboot your system to ensure that changes take effect.\033[0m\n'
+      '${coreutils}/bin/printf' '\n' ;
 
       return "''${XC}"
     }
 
-    init() {
+    setup() {
       local XC=0
 
-      '${pkgs.coreutils}/bin/printf' \
-        '# \033[3mClean up workspace\033[0m ---------------------------------------------------------------------------------- #\n' ;
+      '${coreutils}/bin/printf' \
+        '# \033[3mSet up udev rules\033[0m ----------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.coreutils}/bin/rm' -rf -- "''${_ROOT_DIR}/keymap/" ;
+        '${coreutils}/bin/printf' 'Set up /etc/udev/rules.d/\n' &&
+          $(
+            (${which}/bin/which doas >/dev/null 2>/dev/null && ${coreutils}/bin/printf 'doas bash') ||
+              (${which}/bin/which sudo >/dev/null 2>/dev/null && ${coreutils}/bin/printf 'sudo bash') ||
+              (${coreutils}/bin/printf 'su')
+          ) -c "
+            '${coreutils}/bin/mkdir' -p '/etc/udev/rules.d/' &&
+            '${coreutils}/bin/cp' -rf \"''${_ROOT_DIR}/QMK/util/udev/\"* '/etc/udev/rules.d/'
+          " &&
+          '${coreutils}/bin/printf' '/etc/udev/rules.d/ set up successfully\n' ;
       ) || XC="$(( "''${XC}" + 0x01 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
-      '${pkgs.coreutils}/bin/printf' \
-        '# \033[3mCopy default keymap\033[0m --------------------------------------------------------------------------------- #\n' ;
+      '${coreutils}/bin/printf' \
+        '# \033[3mResize /run/user/$UID\033[0m ------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.coreutils}/bin/cp' -rf -- "''${_ROOT_DIR}/QMK/keyboards/crkbd/keymaps/default" "''${_ROOT_DIR}/keymap";
+        '${coreutils}/bin/printf' 'Set up /etc/udev/rules.d/\n' &&
+          $(
+            (${which}/bin/which doas >/dev/null 2>/dev/null && ${coreutils}/bin/printf 'doas sh') ||
+              (${which}/bin/which sudo >/dev/null 2>/dev/null && ${coreutils}/bin/printf 'sudo sh') ||
+              (${coreutils}/bin/printf 'su')
+          ) -c "
+            '${coreutils}/bin/mkdir' -p '/etc/systemd/logind.conf.d/' &&
+            '${coreutils}/bin/printf' '[Login]\nRuntimeDirectorySize=99%%\n' >'/etc/systemd/logind.conf.d/runtime_directory_size.conf'
+          " &&
+          '${coreutils}/bin/printf' '/run/user/$UID resized successfully\n' ;
       ) || XC="$(( "''${XC}" + 0x02 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
+
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
+          '# \033[3mFinish\033[0m ---------------------------------------------------------------------------------------------- #\n' ;
+        '${coreutils}/bin/printf' '\033[3mSet up complete.\nPlease reboot your system to ensure that changes take effect.\033[0m\n\n'
+      fi
 
       return "''${XC}"
     }
@@ -230,12 +247,12 @@ in pkgs.mkShell {
     update() {
       local XC=0
 
-      '${pkgs.coreutils}/bin/printf' \
-        '# \033[3mUpdate submodule\033[0m ------------------------------------------------------------------------------------ #\n' ;
+      '${coreutils}/bin/printf' \
+        '# \033[3mUpdate submodules\033[0m ----------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" submodule update --remote --progress ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}" submodule update --remote --progress ;
       ) || XC="$(( "''${XC}" + 0x01 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
       return "''${XC}"
     }
@@ -243,13 +260,13 @@ in pkgs.mkShell {
     clean() {
       local XC=0
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mClean workspace\033[0m ------------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df && \
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}" clean -dfX ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df &&
+          '${git}/bin/git' -C "''${_ROOT_DIR}" clean -dfX ;
       ) || XC="$(( "''${XC}" + 0x01 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
       return "''${XC}"
     }
@@ -257,33 +274,69 @@ in pkgs.mkShell {
     lint() {
       local XC=0
 
-      local KEYMAP_ID="$('${pkgs.coreutils}/bin/cat' /proc/sys/kernel/random/uuid)"
+      local KEYMAP_ID="$('${coreutils}/bin/cat' /proc/sys/kernel/random/uuid)"
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mLink keymap\033[0m ----------------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.coreutils}/bin/rm' -f -- "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" && \
-        '${pkgs.coreutils}/bin/ln' -sf "''${_ROOT_DIR}/keymap" "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" && \
-        '${pkgs.coreutils}/bin/printf' 'Linked QMK/keyboards/${KEYBOARD}/keymaps/%s\n' "''${KEYMAP_ID}" ;
+        '${coreutils}/bin/rm' -f -- "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/ln' -sf "''${_ROOT_DIR}/keymap" "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/printf' 'Linked QMK/keyboards/${KEYBOARD}/keymaps/%s\n' "''${KEYMAP_ID}" ;
       ) || XC="$(( "''${XC}" + 0x01 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
-      [[ "''${XC}" -ne 0 ]] || (
-        '${pkgs.coreutils}/bin/printf' \
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
           '# \033[3mQMK linting\033[0m ----------------------------------------------------------------------------------------- #\n' ;
         (
-          cd "''${_ROOT_DIR}/QMK" && \
-          '${pkgs.nix}/bin/nix-shell' --pure --run "qmk lint -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
+          cd "''${_ROOT_DIR}/QMK" &&
+            '${nix}/bin/nix-shell' --pure --run "qmk lint --strict -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
         ) || XC="$(( "''${XC}" + 0x02 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
-      )
+        '${coreutils}/bin/printf' '\n' ;
+      fi
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mUnlink keymap\033[0m --------------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df ;
       ) || XC="$(( "''${XC}" + 0x04 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
+
+      return "''${XC}"
+    }
+
+    format() {
+      local XC=0
+
+      local KEYMAP_ID="$('${coreutils}/bin/cat' /proc/sys/kernel/random/uuid)"
+
+      '${coreutils}/bin/printf' \
+        '# \033[3mLink keymap\033[0m ----------------------------------------------------------------------------------------- #\n' ;
+      (
+        '${coreutils}/bin/rm' -f -- "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/ln' -sf "''${_ROOT_DIR}/keymap" "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/printf' 'Linked QMK/keyboards/${KEYBOARD}/keymaps/%s\n' "''${KEYMAP_ID}" ;
+      ) || XC="$(( "''${XC}" + 0x01 ))" ;
+      '${coreutils}/bin/printf' '\n' ;
+
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
+          '# \033[3mFormat code\033[0m ----------------------------------------------------------------------------------------- #\n' ;
+        (
+          cd "''${_ROOT_DIR}/QMK" &&
+            '${nix}/bin/nix-shell' --pure --run "${clang-tools}/bin/clang-format -i --verbose \$(
+              ${findutils}/bin/find -L 'keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" -type f -regextype awk -regex '.+\.(h|hpp|c|cpp|inc)'
+            )" ;
+        ) || XC="$(( "''${XC}" + 0x02 ))" ;
+        '${coreutils}/bin/printf' '\n' ;
+      fi
+
+      '${coreutils}/bin/printf' \
+        '# \033[3mUnlink keymap\033[0m --------------------------------------------------------------------------------------- #\n' ;
+      (
+        '${git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df ;
+      ) || XC="$(( "''${XC}" + 0x04 ))" ;
+      '${coreutils}/bin/printf' '\n' ;
 
       return "''${XC}"
     }
@@ -291,53 +344,55 @@ in pkgs.mkShell {
     compile() {
       local XC=0
 
-      local KEYMAP_ID="$('${pkgs.coreutils}/bin/cat' /proc/sys/kernel/random/uuid)"
+      local KEYMAP_ID="$('${coreutils}/bin/cat' /proc/sys/kernel/random/uuid)"
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mClean up old builds\033[0m --------------------------------------------------------------------------------- #\n' ;
       (
-        cd "''${_ROOT_DIR}/QMK" && \
-        '${pkgs.nix}/bin/nix-shell' --pure --run 'qmk clean' && \
-        '${pkgs.coreutils}/bin/printf' 'Cleaned QMK/.build\n' ;
+        cd "''${_ROOT_DIR}/QMK" &&
+          '${nix}/bin/nix-shell' --pure --run 'qmk clean' &&
+          '${coreutils}/bin/printf' 'Cleaned QMK/.build\n' ;
       ) || XC="$(( "''${XC}" + 0x01 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mLink keymap\033[0m ----------------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.coreutils}/bin/rm' -f -- "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" && \
-        '${pkgs.coreutils}/bin/ln' -sf "''${_ROOT_DIR}/keymap" "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" && \
-        '${pkgs.coreutils}/bin/printf' 'Linked QMK/keyboards/${KEYBOARD}/keymaps/%s\n' "''${KEYMAP_ID}" ;
+        '${coreutils}/bin/rm' -f -- "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/ln' -sf "''${_ROOT_DIR}/keymap" "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/printf' 'Linked QMK/keyboards/${KEYBOARD}/keymaps/%s\n' "''${KEYMAP_ID}" ;
       ) || XC="$(( "''${XC}" + 0x02 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
-      [[ "''${XC}" -ne 0 ]] || (
-        '${pkgs.coreutils}/bin/printf' \
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
           '# \033[3mCompile\033[0m --------------------------------------------------------------------------------------------- #\n' ;
         (
-          cd "''${_ROOT_DIR}/QMK" && \
-          '${pkgs.nix}/bin/nix-shell' --pure --run "qmk compile -j '${builtins.toString PARALLEL}' -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
+          cd "''${_ROOT_DIR}/QMK" &&
+            '${nix}/bin/nix-shell' --pure --run "qmk compile -j '${builtins.toString PARALLEL}' -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
         ) || XC="$(( "''${XC}" + 0x04 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
-      )
+        '${coreutils}/bin/printf' '\n' ;
+      fi
 
-      [[ "''${XC}" -ne 0 ]] || (
-        '${pkgs.coreutils}/bin/printf' \
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
           '# \033[3mExtract HEX file\033[0m ------------------------------------------------------------------------------------ #\n' ;
         (
-          '${pkgs.coreutils}/bin/mkdir' -p "''${_ROOT_DIR}/.build" && \
-          '${pkgs.coreutils}/bin/ls' "''${_ROOT_DIR}/QMK/.build"/*.hex | head -1 | xargs -i cp -f -- '{}' "''${_ROOT_DIR}/.build/firmware.hex" && \
-          '${pkgs.coreutils}/bin/printf' 'Extracted .build/firmware.hex\n' ;
+          '${coreutils}/bin/mkdir' -p "''${_ROOT_DIR}/.build" &&
+            '${coreutils}/bin/ls' "''${_ROOT_DIR}/QMK/.build"/*.hex |
+              '${coreutils}/bin/head' -1 |
+              '${findutils}/bin/xargs' -i cp -f -- '{}' "''${_ROOT_DIR}/.build/firmware.hex" &&
+            '${coreutils}/bin/printf' 'Extracted .build/firmware.hex\n' ;
         ) || XC="$(( "''${XC}" + 0x08 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n'
-      )
+        '${coreutils}/bin/printf' '\n'
+      fi
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mUnlink keymap\033[0m --------------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df ;
       ) || XC="$(( "''${XC}" + 0x10 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
       return "''${XC}"
     }
@@ -345,196 +400,200 @@ in pkgs.mkShell {
     flash() {
       local XC=0
 
-      local KEYMAP_ID="$('${pkgs.coreutils}/bin/cat' /proc/sys/kernel/random/uuid)"
+      local KEYMAP_ID="$('${coreutils}/bin/cat' /proc/sys/kernel/random/uuid)"
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mClean up old builds\033[0m --------------------------------------------------------------------------------- #\n' ;
       (
-        cd "''${_ROOT_DIR}/QMK" && \
-        '${pkgs.nix}/bin/nix-shell' --pure --run 'qmk clean' && \
-        '${pkgs.coreutils}/bin/printf' 'Cleaned QMK/.build\n' ;
+        cd "''${_ROOT_DIR}/QMK" &&
+          '${nix}/bin/nix-shell' --pure --run 'qmk clean' &&
+          '${coreutils}/bin/printf' 'Cleaned QMK/.build\n' ;
       ) || XC="$(( "''${XC}" + 0x01 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mLink keymap\033[0m ----------------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.coreutils}/bin/rm' -f -- "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" && \
-        '${pkgs.coreutils}/bin/ln' -sf "''${_ROOT_DIR}/keymap" "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" && \
-        '${pkgs.coreutils}/bin/printf' 'Linked QMK/keyboards/${KEYBOARD}/keymaps/%s\n' "''${KEYMAP_ID}" ;
+        '${coreutils}/bin/rm' -f -- "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/ln' -sf "''${_ROOT_DIR}/keymap" "''${_ROOT_DIR}"/'QMK/keyboards/${KEYBOARD}/keymaps'/"''${KEYMAP_ID}" &&
+          '${coreutils}/bin/printf' 'Linked QMK/keyboards/${KEYBOARD}/keymaps/%s\n' "''${KEYMAP_ID}" ;
       ) || XC="$(( "''${XC}" + 0x02 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
-      [[ "''${XC}" -ne 0 ]] || (
-        '${pkgs.coreutils}/bin/printf' \
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
           '# \033[3mCompile\033[0m --------------------------------------------------------------------------------------------- #\n' ;
         (
-          cd "''${_ROOT_DIR}/QMK" && \
-          '${pkgs.nix}/bin/nix-shell' --pure --run "qmk compile -j '${builtins.toString PARALLEL}' -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
+          cd "''${_ROOT_DIR}/QMK" &&
+            '${nix}/bin/nix-shell' --pure --run "qmk compile -j '${builtins.toString PARALLEL}' -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
         ) || XC="$(( "''${XC}" + 0x04 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
-      )
+        '${coreutils}/bin/printf' '\n' ;
+      fi
 
-      [[ "''${XC}" -ne 0 ]] || (
-        '${pkgs.coreutils}/bin/printf' \
+      if [ "''${XC}" -eq 0 ] ; then
+        '${coreutils}/bin/printf' \
           '# \033[3mFlash\033[0m ----------------------------------------------------------------------------------------------- #\n' ;
         (
-          cd "''${_ROOT_DIR}/QMK" && \
-          '${pkgs.nix}/bin/nix-shell' --pure --run "qmk flash -j '${builtins.toString PARALLEL}' -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
+          cd "''${_ROOT_DIR}/QMK" &&
+            '${nix}/bin/nix-shell' --pure --run "qmk flash -j '${builtins.toString PARALLEL}' -kb '${KEYBOARD}' -km ''\'''${KEYMAP_ID}'" ;
         ) || XC="$(( "''${XC}" + 0x08 ))" ;
-        '${pkgs.coreutils}/bin/printf' '\n' ;
-      )
+        '${coreutils}/bin/printf' '\n' ;
+      fi
 
-      '${pkgs.coreutils}/bin/printf' \
+      '${coreutils}/bin/printf' \
         '# \033[3mUnlink keymap\033[0m --------------------------------------------------------------------------------------- #\n' ;
       (
-        '${pkgs.git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df ;
+        '${git}/bin/git' -C "''${_ROOT_DIR}/QMK" clean -df ;
       ) || XC="$(( "''${XC}" + 0x10 ))" ;
-      '${pkgs.coreutils}/bin/printf' '\n' ;
+      '${coreutils}/bin/printf' '\n' ;
 
       return "''${XC}"
     }
 
     help() {
-      '${pkgs.coreutils}/bin/cat' <<EOF | '${pkgs.man}/bin/man' -l - 2>/dev/null
-.TH "NIX+QMK" "1" "" "" "Nix+QMK toolbox"
-.\----------------------------------------------------------------------------\.
-.SH NAME
-.IP clean .9i
-- Clean workdir.
-.IP compile
-- Build the keymap into a flashable .hex file.
-.IP flash
-- Burn the firmware onto a keyboard.
-.IP help
-- Show help info on available commands.
-.IP init
-- Copy the default keymap to the workdir.
-.IP lint
-- Run a simple lint on the keymap source code.
-.IP setup
-- Configure the work environment.
-.IP update
-- Update QMK to latest version.
-.IP welcome
-- Show the welcome screen.
-.\----------------------------------------------------------------------------\.
-.SH DESCRIPTION
-Set of scripts to handle out of tree QMK keymaps. The intended purpose of these
-is to both decluter QMK itself and to allow versioning of QMK to mitigate the
-effects of breaking changes.
-.PP
-NOTE: None of these commands take any arguments.
-.\----------------------------------------------------------------------------\.
-.SH EXAMPLES
-Usual development goes something along the lines:
-.PP
-.nf
-.RS
-# Install Nix
-sh <(curl -L 'https://nixos.org/nix/install') --no-daemon
-# Clone keymap repo
-# If you don't clone, an empty repo will be initialised later on
-git clone 'https://github.com/<USER>/<REPO>/' '<WORKDIR>'
-cd '<WORKDIR>'
-# Enter Nix+QMK toolbox
-nix-shell
-# Set up environment
-setup
-# Reboot to make setup changes take effect
-sudo reboot now
-
-# After reboot, move back to workdir
-cd '<WORKDIR>'
-# Enter back into Nix+QMK toolbox
-nix-shell
-# Copy the default keymap to workdir
-init
-# Edit the keymap
-vim ./keymap.c
-# Check code
-lint
-# Once done editing, compile the code
-compile
-# After the code compiled successfully, flash it
-# (Put the keyboard into bootloader mode when prompted)
-flash
-# Clean up build files
-clean
-
-# When there is an update to QMK
-update
-# You may need to set up the environment again
-setup
-# Reboot to make setup changes take effect
-sudo reboot now
-.RE
-.fi
-.\----------------------------------------------------------------------------\.
-.SH PROMPT EXPLAINED
-The CLI tool has a custom prompt, which shows some non essential but nice to
-have info.
-.PP
-.nf
-
-     +-------------------------- A simple hardcoded value, to serve as a
-     |                           hint that we are currently inside the
-     |                           toolbox environment.
-     |
-     |       +------------------ The current ref of the repo. May be a
-     |       |                   branch name, a commit hash, or <N/A>,
-     |       |                   depending of the current status of the
-     |       |                   repo (or lack thereof). It also sports
-     |       |                   a colour code:
-     |       |                     * Green for clean repos.
-     |       |                     * Yellow for a repo with staged but
-     |       |                       uncommitted changes.
-     |       |                     * Red if there are unstaged changes.
-     |       |
-     |       |       +---------- The current directory, relative to the
-     |       |       |           root of the project.
-     |       |       |
-     |       |       |       +-- The exit code of the last command,
-     |       |       |       |   formatted in HEX and colour coded.
-     |       |       |       |     * Green for success (0x00).
-     |       |       |       |     * Red for errors (0x01-0x7F).
-     |       |       |       |     * Yellow for signals (0x80-0xFF).
-     V       V       V       V
-[ NIX+QMK @ main : ./foo/ ] 0x00 >
-
-.fi
-.\----------------------------------------------------------------------------\.
-.SH TROUBLESHOOTING
-If something is not working as expected, the first step to check is the exit
-code itself. I've wrote the scripts in such a way that each bit in the exit code
-corresponds to a specific section of said script. e.g., if the code is 5, then
-the sections 1 and 3 failed ( 2^(1-1) + 2^(3-1) = 5 ).
-.PP
-From the exit code you may be able to inspect the shell.nix file to determine
-the source of the issue (the entirety of the relevant code is in there in a
-monolithic file).
-.PP
-If you want to open an issue or a PR feel free to do so @
-.br
-https://github.com/kip93/qmk-crkbd/
-EOF
+      '${coreutils}/bin/cat' <<EOF | MANPAGER="''${MANPAGER:-''${PAGER:-${most}/bin/most -s}}" '${man}/bin/man' -l - 2>/dev/null
+    .TH "NIX+QMK" "1" "" "" "Nix+QMK toolbox"
+    .\----------------------------------------------------------------------------\.
+    .SH NAME
+    .IP clean .9i
+    - Clean workdir.
+    .IP compile
+    - Build the keymap into a flashable .hex file.
+    .IP flash
+    - Burn the firmware onto a keyboard.
+    .IP format
+    - Formats the keymap code.
+    .IP help
+    - Show help info on available commands.
+    .IP init
+    - Setup your workspace.
+    .IP lint
+    - Run a simple lint on the keymap source code.
+    .IP setup
+    - Configure the work environment.
+    .IP update
+    - Update QMK to latest version.
+    .IP welcome
+    - Show the welcome screen.
+    .\----------------------------------------------------------------------------\.
+    .SH DESCRIPTION
+    Set of scripts to handle out of tree QMK keymaps. The intended purpose of these
+    is to both decluter QMK itself and to allow versioning of QMK to mitigate the
+    effects of breaking changes.
+    .PP
+    NOTE: None of these commands take any arguments.
+    .\----------------------------------------------------------------------------\.
+    .SH EXAMPLES
+    Usual development goes something along the lines:
+    .PP
+    .nf
+    .RS
+    # Install Nix
+    sh <(curl -L 'https://nixos.org/nix/install') --no-daemon
+    # Clone keymap repo
+    # If you don't clone, an empty repo will be initialised later on
+    git clone 'https://github.com/<USER>/<REPO>/' '<WORKDIR>'
+    cd '<WORKDIR>'
+    # Enter Nix+QMK toolbox
+    nix-shell
+    # Initialise your workspace, including a default keymap
+    init
+    # Set up environment
+    setup
+    # Reboot to make environment setup changes take effect
+    sudo reboot now
+
+    # After reboot, move back to workdir
+    cd '<WORKDIR>'
+    # Enter back into Nix+QMK toolbox
+    nix-shell
+    # Edit the keymap
+    vim ./keymap/keymap.c
+    # Format code
+    format
+    # Check code
+    lint
+    # Once done editing, compile the code
+    compile
+    # After the code compiled successfully, flash it
+    # (Put the keyboard into bootloader mode when prompted)
+    flash
+    # Clean up build files
+    clean
+
+    # When there is an update to QMK
+    update
+    # You may need to set up the environment again
+    setup
+    # Reboot to make setup changes take effect
+    sudo reboot now
+    .RE
+    .fi
+    .\----------------------------------------------------------------------------\.
+    .SH PROMPT EXPLAINED
+    The CLI tool has a custom prompt, which shows some non essential but nice to
+    have info.
+    .PP
+    .nf
+
+        +-------------------------- A simple hardcoded value, to serve as a
+        |                           hint that we are currently inside the
+        |                           toolbox environment.
+        |
+        |       +------------------ The current ref of the repo. May be a
+        |       |                   branch name, a commit hash, or <N/A>,
+        |       |                   depending of the current status of the
+        |       |                   repo (or lack thereof). It also sports
+        |       |                   a colour code:
+        |       |                     * Green for clean repos.
+        |       |                     * Yellow for a repo with staged but
+        |       |                       uncommitted changes.
+        |       |                     * Red if there are unstaged changes.
+        |       |
+        |       |       +---------- The current directory, relative to the
+        |       |       |           root of the project.
+        |       |       |
+        |       |       |       +-- The exit code of the last command,
+        |       |       |       |   formatted in HEX and colour coded.
+        |       |       |       |     * Green for success (0x00).
+        |       |       |       |     * Red for errors (0x01-0x7F).
+        |       |       |       |     * Yellow for signals (0x80-0xFF).
+        V       V       V       V
+    [ NIX+QMK @ main : ./foo/ ] 0x00 >
+
+    .fi
+    .\----------------------------------------------------------------------------\.
+    .SH TROUBLESHOOTING
+    If something is not working as expected, the first step to check is the exit
+    code itself. I've wrote the scripts in such a way that each bit in the exit code
+    corresponds to a specific section of said script. e.g., if the code is 5, then
+    the sections 1 and 3 failed ( 2^(1-1) + 2^(3-1) = 5 ).
+    .PP
+    From the exit code you may be able to inspect the shell.nix file to determine
+    the source of the issue (the entirety of the relevant code is in there in a
+    monolithic file).
+    .PP
+    If you want to open an issue or a PR feel free to do so @
+    .br
+    https://github.com/kip93/qmk-crkbd/
+    EOF
 
       return 0
     }
 
     welcome() {
-      '${pkgs.coreutils}/bin/printf' '\033[0m     , , , , , ,\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m   \033[1;30m.-------------.\033[0m\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m - \033[1;30m|             | \033[0m-   \033[3mWelcome to this (unofficial) \033[1mNix+QMK toolbox\033[0;3m.\033[0m\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m - \033[1;30m|   \033[0;1m|  |  |\033[0;1;30m   | \033[0m-\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m - \033[1;30m|   \033[0;1m|  |  |\033[0;1;30m   | \033[0m-   \033[3mAn opinionated set of scripts for standalone QMK keymaps\033[0m\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m - \033[1;30m|   \033[0;1m|__|__|\033[0;1;30m   | \033[0m-\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m - \033[1;30m|      \033[0;1m|\033[0;1;30m      | \033[0m-\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m - \033[1;30m|_____________| \033[0m-\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m     , , , , , ,\n'
-      '${pkgs.coreutils}/bin/printf' '\n'
-      '${pkgs.coreutils}/bin/printf' '\033[0m\033[3mType `help` to get info on available commands.\033[0m\n'
-      '${pkgs.coreutils}/bin/printf' '\n'
+      '${coreutils}/bin/printf' '\033[0m     , , , , , ,\n'
+      '${coreutils}/bin/printf' '\033[0m   \033[1;30m.-------------.\033[0m\n'
+      '${coreutils}/bin/printf' '\033[0m - \033[1;30m|             | \033[0m-   \033[3mWelcome to this (unofficial) \033[1mNix+QMK toolbox\033[0;3m.\033[0m\n'
+      '${coreutils}/bin/printf' '\033[0m - \033[1;30m|   \033[0;1m|  |  |\033[0;1;30m   | \033[0m-\n'
+      '${coreutils}/bin/printf' '\033[0m - \033[1;30m|   \033[0;1m|  |  |\033[0;1;30m   | \033[0m-   \033[3mAn opinionated set of scripts for standalone QMK keymaps\033[0m\n'
+      '${coreutils}/bin/printf' '\033[0m - \033[1;30m|   \033[0;1m|__|__|\033[0;1;30m   | \033[0m-\n'
+      '${coreutils}/bin/printf' '\033[0m - \033[1;30m|      \033[0;1m|\033[0;1;30m      | \033[0m-\n'
+      '${coreutils}/bin/printf' '\033[0m - \033[1;30m|_____________| \033[0m-\n'
+      '${coreutils}/bin/printf' '\033[0m     , , , , , ,\n'
+      '${coreutils}/bin/printf' '\n'
+      '${coreutils}/bin/printf' '\033[0m\033[3mType `help` to get info on available commands.\033[0m\n'
+      '${coreutils}/bin/printf' '\n'
 
       return 0
     }