feat: add pre-commit and initial justfile

.pre-commit-config.yaml

@@ -0,0 +1,18 @@
+exclude: '^(qmk_upstream/|qmk_framework/|\.build/)'
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-merge-conflict
+      - id: check-added-large-files
+      - id: check-yaml
+      - id: check-json
+
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: v18.1.8
+    hooks:
+      - id: clang-format
+        types_or: [c, c++]

justfile

@@ -0,0 +1,20 @@
+[private]
+default:
+    @just --list
+
+# bump submodule(s) to latest tag
+bump-qmk submodule="":
+    #!/usr/bin/env bash
+    set -e
+    if [ -z "{{submodule}}" ]; then
+        targets="qmk_upstream qmk_framework"
+    else
+        targets="{{submodule}}"
+    fi
+    for sm in $targets; do
+        old=$(git -C $sm describe --tags --exact-match HEAD 2>/dev/null || git -C $sm rev-parse --short HEAD)
+        git -C $sm fetch --tags --quiet
+        new=$(git -C $sm tag --sort=-creatordate | head -1)
+        git -C $sm checkout --quiet "$new"
+        echo "bumped $sm from $old to $new"
+    done