Add linting support and github action to run it

Author: dannyadair

.editorconfig

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+[*.{css,js,json,less,md,py,rst,sass,scss,svg.j2,xml,yaml,yml}]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{json,yml,yaml,rst,md}]
+indent_size = 2

.github/workflows/pre-commit.yaml

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+name: pre-commit
+
+on:
+  pull_request:
+    branches:
+      - "main*"
+  push:
+    branches:
+      - "main"
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Get python version
+        run: echo "PY=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
+      - uses: actions/cache@v4
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
+      - name: Install pre-commit
+        run: pip install pre-commit
+      - name: Run pre-commit
+        run: pre-commit run --all-files --show-diff-on-failure --color=always
+      - name: Check that all files generated by pre-commit are in git
+        run: |
+          newfiles="$(git ls-files --others --exclude-from=.gitignore)"
+          if [ "$newfiles" != "" ] ; then
+              echo "Please check-in the following files:"
+              echo "$newfiles"
+              exit 1
+          fi

.pre-commit-config.yaml

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+default_language_version:
+  python: python3
+  node: "22.9.0"
+repos:
+  - repo: local
+    hooks:
+      - id: prettier
+        name: prettier (with plugin-xml)
+        entry: prettier
+        args:
+          - --write
+          - --list-different
+          - --ignore-unknown
+        types: [text]
+        files: \.(css|htm|html|js|json|jsx|less|md|scss|toml|ts|xml|yaml|yml)$
+        language: node
+        additional_dependencies:
+          - "prettier@3.3.3"
+          - "@prettier/plugin-xml@3.4.1"
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: debug-statements
+      - id: fix-encoding-pragma
+        args: ["--remove"]
+      - id: check-case-conflict
+      - id: check-docstring-first
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: check-symlinks
+      - id: check-xml
+      - id: mixed-line-ending
+        args: ["--fix=lf"]
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.6.8
+    hooks:
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+      - id: ruff-format
+  - repo: https://github.com/PyCQA/pylint
+    rev: v3.3.4
+    hooks:
+      - id: pylint
+      - id: pylint
+        additional_dependencies:
+          - "pdfbaker"

prettier.config.cjs

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+/** @type {import('prettier').Config} */
+
+const config = {
+  plugins: [require.resolve("@prettier/plugin-xml")],
+  bracketSpacing: false,
+  printWidth: 88,
+  proseWrap: "always",
+  semi: true,
+  trailingComma: "es5",
+  xmlWhitespaceSensitivity: "strict",
+};
+
+module.exports = config;