Add the formatter back

.pre-commit-config.yaml

@@ -72,3 +72,14 @@ repos:
     rev: v2.10.0
     hooks:
       - id: hadolint-docker
+
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: "v3.1.0"
+    hooks:
+      # Use Prettier to lint XML files because, well.. its rules are prettier than most linters, as the name implies.
+      # Also we use it in the UI, so it's familiar.
+      - id: prettier
+        additional_dependencies:
+          - "[email protected]"
+          - "@prettier/[email protected]"
+        files: \.(xml|xacro)$

.prettierrc.cjs

@@ -0,0 +1,5 @@
+module.exports = {
+  plugins: [require.resolve("@prettier/plugin-xml")],
+  xmlWhitespaceSensitivity: "ignore",
+  xmlQuoteAttributes: "double"
+}