enable pre-commit

.editorconfig

@@ -10,6 +10,8 @@ indent_size = tab
 
 [*.{markdown,md}]
 trim_trailing_whitespace = false
+indent_style = space
+indent_size = 2
 
 [*.{tsv,tab}]
 indent_style = tab

.pre-commit-config.yaml

@@ -0,0 +1,38 @@
+ci:
+  # Forĝejo/Gitea mirrors will autoclose pull requests. This should decrease
+  # the frequency of unnecessary PRs.
+  # https://github.com/pre-commit-ci/issues/issues/83
+  autoupdate_schedule: quarterly
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-executables-have-shebangs
+      - id: check-shebang-scripts-are-executable
+      - id: destroyed-symlinks
+      - id: detect-private-key
+      - id: end-of-file-fixer
+      - id: fix-byte-order-marker
+      - id: trailing-whitespace
+        exclude_types: [tsv, markdown]
+
+  - repo: https://github.com/thlorenz/doctoc
+    rev: v2.2.0
+    hooks:
+      - id: doctoc
+        args: [--update-only]
+
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: "v3.0.0-alpha.9-for-vscode"
+    hooks:
+      - id: prettier
+
+  - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
+    rev: "2.7.1"
+    hooks:
+      - id: editorconfig-checker
+        alias: ec
+        args: [-disable-max-line-length]