Use Hatch for build backend

.gitignore

@@ -58,13 +58,13 @@ target/
 
 tools/emoji.md
 
-site/*
+site/
 
-tools/tags/*
+tools/tags/
 
 tmp*
 
-node_modules/*
+node_modules/
 
 manifest*.json
 *.dic

docs/src/markdown/.snippets/refs.md

@@ -0,0 +1,4 @@
+--8<--
+links.md
+abbr.md
+--8<--

docs/src/markdown/extensions/emoji.md

@@ -520,5 +520,3 @@ Option                      | Type       | Default              | Description
         }
     }
     ```
-
---8<-- "refs.txt"

docs/src/markdown/extensions/escapeall.md

@@ -57,5 +57,3 @@ Option      | Type | Default         | Description
 ----------- | ---- | --------------- | ----------
 `hardbreak` | bool | `#!py3 False`   | Escaped newlines will be hard breaks: `#!html <br>`.
 `nbsp`      | bool | `#!py3 False`   | Escaped spaces will be non-breaking spaces: `#!html &nbsp;`.
-
---8<-- "links.txt"

docs/src/markdown/extensions/keys.md

@@ -362,5 +362,3 @@ Option       | Type   | Default        | Description
 `class`      | string | `#!py3 'keys'` | Defines a class(es) to apply to the HTML wrapper element.
 `camel_case` | bool   | `#!py3 False`  | Allow the use of camel case for key names `PgUp` --> `pg-up`.
 `key_map`    | dict   | `#!py3 {}`     | Add additional keys to the key-map index or override output of existing outputs. See [Extending/Modifying Key-Map Index](#extendingmodifying-key-map-index) for more info.
-
---8<-- "links.txt"

docs/src/markdown/extensions/saneheaders.md

@@ -36,5 +36,3 @@ With SaneHeaders, only the first is a header:
 
 ##Not a Header
 ```
-
---8<-- "links.txt"

docs/src/markdown/extensions/striphtml.md

@@ -49,5 +49,3 @@ Option                   | Type     | Default      | Description
 `strip_comments`         | bool     | `#!py3 True` | Strip HTML comments during post process.
 `strip_js_on_attributes` | bool     | `#!py3 True` | Strip JavaScript script attributes with the pattern on* during post process.
 `strip_attributes`       | [string] | `#!py3 []`   | A list of tag attribute names to strip.
-
---8<-- "links.txt"

docs/src/markdown/extensions/tabbed.md

@@ -536,5 +536,3 @@ to some practical number.
 Option            | Type | Default       | Description
 ----------------- | ---- | ------------- | -----------
 `alternate_style` | bool | `#!py3 False` | Use the experimental, alternative style.
-
---8<-- "refs.txt"

docs/src/markdown/extensions/tilde.md

@@ -55,5 +55,3 @@ Option         | Type | Default     | Description
 `smart_delete` | bool | `#!py3 True` | Use smart logic with delete characters.
 `delete`       | bool | `#!py3 True` | Enable delete feature.
 `subscript`    | bool | `#!py3 True` | Enable subscript feature.
-
---8<-- "links.txt"

docs/src/markdown/extras/mermaid.md

@@ -488,5 +488,3 @@ graph TD
     C -->|One| D[Result 1]
     C -->|Two| E[Result 2]
 ```
-
---8<-- "links.txt"

docs/src/markdown/extras/slugs.md

@@ -45,5 +45,3 @@ extension_configs = {
 
 If you are using something like [MkDocs][mkdocs], check out our [FAQ](../faq.md#function-references-in-yaml) which gives
 guidance on how to specify configurable functions in the YAML configuration.
-
---8<-- "refs.txt"

docs/src/mkdocs.yml

@@ -145,7 +145,7 @@ markdown_extensions:
       - docs/src/markdown/.snippets
       - LICENSE.md
       auto_append:
-      - refs.txt
+      - refs.md
       check_paths: true
   - pymdownx.keys:
       separator: "\uff0b"

hatch_build.py

@@ -0,0 +1,52 @@
+"""Dynamically define some metadata."""
+import os
+
+from hatchling.metadata.plugin.interface import MetadataHookInterface
+
+
+def get_version_dev_status(root):
+    """Get version_info without importing the entire module."""
+
+    import importlib.util
+
+    path = os.path.join(root, "pymdownx", "__meta__.py")
+    spec = importlib.util.spec_from_file_location("__meta__", path)
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module.__version_info__._get_dev_status()
+
+
+def get_requirements(root):
+    """Load list of dependencies."""
+
+    install_requires = []
+    with open(os.path.join(root, "requirements", "project.txt")) as f:
+        for line in f:
+            if not line.startswith("#"):
+                install_requires.append(line.strip())
+    return install_requires
+
+
+class CustomMetadataHook(MetadataHookInterface):
+    """Our metadata hook."""
+
+    def update(self, metadata):
+        """See https://ofek.dev/hatch/latest/plugins/metadata-hook/ for more information."""
+
+        metadata["dependencies"] = get_requirements(self.root)
+        metadata["classifiers"] = [
+            f"Development Status :: {get_version_dev_status(self.root)}",
+            "Environment :: Console",
+            "Intended Audience :: Developers",
+            "License :: OSI Approved :: MIT License",
+            "Operating System :: OS Independent",
+            "Programming Language :: Python :: 3",
+            "Programming Language :: Python :: 3.7",
+            "Programming Language :: Python :: 3.8",
+            "Programming Language :: Python :: 3.9",
+            "Programming Language :: Python :: 3.10",
+            "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
+            "Topic :: Software Development :: Libraries :: Python Modules",
+            "Topic :: Text Processing :: Filters",
+            "Topic :: Text Processing :: Markup :: HTML",
+        ]

mkdocs.yml

@@ -145,7 +145,7 @@ markdown_extensions:
       - docs/src/markdown/.snippets
       - LICENSE.md
       auto_append:
-      - refs.txt
+      - refs.md
       check_paths: true
   - pymdownx.keys:
       separator: "\uff0b"

pyproject.toml

@@ -1,7 +1,66 @@
 [build-system]
 requires = [
-    "setuptools>=42",
-    "wheel"
+    "hatchling>=0.21.0",
 ]
+build-backend = "hatchling.build"
 
-build-backend = "setuptools.build_meta"
+[project]
+name = "pymdown-extensions"
+description = "Extension pack for Python Markdown."
+readme = "README.md"
+license = "MIT"
+requires-python = ">=3.7"
+authors = [
+    { name = "Isaac Muse", email = "Isaac.Muse@gmail.com" },
+]
+keywords = [
+    "extensions",
+    "markdown",
+]
+dynamic = [
+    "classifiers",
+    "dependencies",
+    "version",
+]
+
+[project.urls]
+Homepage = "https://github.com/facelessuser/pymdown-extensions"
+
+[tool.hatch.version]
+source = "code"
+path = "pymdownx/__meta__.py"
+
+[tool.hatch.build.targets.sdist]
+include = [
+    "/docs/src/markdown/**/*.md",
+    "/docs/src/markdown/**/*.gif",
+    "/docs/src/markdown/**/*.png",
+    "/docs/src/markdown/dictionary/*.txt",
+    "/docs/theme/**/*.css",
+    "/docs/theme/**/*.js",
+    "/docs/theme/**/*.html",
+    "/docs/theme/**/*.css.map",
+    "/docs/theme/**/*.js.map",
+    "/requirements/*.txt",
+    "/pymdownx/**/*.py",
+    "/tests/**/*.txt",
+    "/tests/**/*.py",
+    "/tests/**/*.html",
+    "/tests/**/*.yml",
+    "/tests/**/*.css",
+    "/tests/**/*.png",
+    "/tools/__init__.py",
+    "/tools/pymdownx_md_render.py",
+    "/.pyspelling.yml",
+    "/.coveragerc",
+    "/mkdocs.yml",
+    "/run_tests.py",
+    "/tox.ini",
+]
+
+[tool.hatch.build.targets.wheel]
+include = [
+    "/pymdownx",
+]
+
+[tool.hatch.metadata.hooks.custom]

tox.ini

@@ -1,4 +1,5 @@
 [tox]
+isolated_build = true
 envlist =
     {py37,py38,py39,py310}, lint, documents