chore: Use pre-commit framework (#604)

* Add pre-commit, prettier configs and editorconfig

* Remove `check-toml` hook

* Add isort config

* Add codespell config

* Update hooks

* Remove prettierignore

* Add shellcheck config

* Add lint workflow

* Add pre-commit autoupdate workflow

* Remove path constraints from lint workflow

* Fix CI

* Add guide to CONTRIBUTING.md

* Fix (probably) shfmt

* Fix (probably) shfmt

* Fix (probably) shfmt

.github/workflows/lint.yml

@@ -4,19 +4,38 @@ on:
   push:
     branches:
       - main
-    paths:
-      - "*.sh"
   pull_request:
     branches:
       - main
-    paths:
-      - "*.sh"
 
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: ludeeus/action-shellcheck@1.1.0
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Python
+        uses: actions/setup-python@v2
+
+      # For shfmt pre-commit hook
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: "^1.14"
+
+      - name: Cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cache/pre-commit
+            ~/.cache/pip
+          key: lint-${{ hashFiles('.pre-commit-config.yaml') }}
+
+      - name: Install pre-commit
+        run: pip install -U pre-commit
+
+      - name: Lint
+        run: pre-commit run --color=always --all-files
         env:
-          SHELLCHECK_OPTS: -x
+          GO111MODULE: on