Add a pre-commit configuration

As in Matplotlib, it tests flake8, codespell, and some whitespace. It
also checks YAML linting and the YAML schema.

Also, add an ignored word for codespell, and a schema for checking
package YAML files. The latter confirms that:

- all required keys are included
- values are the right type, such as `keywords` being an array, not a
  string
- the description ends with a period

Author: QuLogic

.pre-commit-config.yaml

@@ -0,0 +1,37 @@
+ci:
+  autofix_prs: false
+  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-docstring-first
+      - id: end-of-file-fixer
+        exclude_types: [svg]
+      - id: mixed-line-ending
+      - id: name-tests-test
+        args: ["--pytest-test-first"]
+      - id: trailing-whitespace
+        exclude_types: [svg]
+  - repo: https://github.com/pycqa/flake8
+    rev: 6.0.0
+    hooks:
+      - id: flake8
+        additional_dependencies: [flake8-force]
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.2.4
+    hooks:
+      - id: codespell
+        files: ^.*\.(py|c|cpp|h|m|md|rst|yml)$
+        args: ["--ignore-words", "ci/codespell-ignore-words.txt"]
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.30.0
+    hooks:
+      - id: yamllint
+  - repo: https://github.com/python-jsonschema/check-jsonschema
+    rev: 0.22.0
+    hooks:
+      - id: check-jsonschema
+        files: ^packages/.*\.yml$
+        args: ['--schemafile', 'package-schema.json']

ci/codespell-ignore-words.txt

@@ -0,0 +1 @@
+nd

package-schema.json

@@ -0,0 +1,34 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "http://matplotlib.org/mpl-third-party/schema.yml",
+  "type": "object",
+  "required": ["name", "repo", "section", "description"],
+  "properties": {
+    "name": {"type": "string"},
+    "repo": {
+      "type": "string",
+      "pattern": "^[^/]+/[^/]+$"
+    },
+    "section": {"type": "string"},
+    "description": {
+      "type": "string",
+      "pattern": "^.+\\.$"
+    },
+
+    "badges": {
+      "type": "array",
+      "items": {"type": "string"},
+      "uniqueItems": true
+    },
+    "conda_channel": {"type": "string"},
+    "conda_package": {"type": "string"},
+    "keywords": {
+      "type": "array",
+      "items": {"type": "string"},
+      "uniqueItems": true
+    },
+    "pypi_name": {"type": "string"},
+    "site": {"type": "string"}
+  },
+  "additionalProperties": false
+}