Raise error instead of warning when order of plugin is defined wrongly,

closes #25

mkdocs_enumerate_headings_plugin/plugin.py

@@ -6,6 +6,7 @@
 from collections import OrderedDict
 from mkdocs.config import config_options
 from mkdocs.plugins import BasePlugin
+from mkdocs.exceptions import ConfigurationError
 from mkdocs_enumerate_headings_plugin.html_page import HTMLPage
 from bs4 import BeautifulSoup
 
@@ -46,7 +47,7 @@ def on_config(self, config, **kwargs):
         def check_position(plugin, plugins):
             if plugin in plugins:
                 if plugins.index("enumerate-headings") < plugins.index(plugin):
-                    logger.warning(
+                    raise ConfigurationError(
                         "[enumerate-headings-plugin] enumerate-headings should be defined after the %s plugin in your mkdocs.yml file"
                         % plugin
                     )

tests/fixtures/projects/material/mkdocs.yml

@@ -10,8 +10,8 @@ theme:
 # Plugins
 plugins:
   - search
-  - enumerate-headings
   - awesome-pages:
       filename: .pages
       collapse_single_pages: false
-      strict: false
+      strict: false
+  - enumerate-headings

tests/test_builds.py

@@ -253,13 +253,7 @@ def test_compatibility_awesomepages_plugin2(tmp_path, caplog):
         "tests/fixtures/projects/awesome_pages/mkdocs_enum_first.yml", tmp_path
     )
     result = build_docs_setup(tmp_proj)
-    assert result.exit_code == 0, "'mkdocs build' command failed"
-
-    # Make sure warning is raised
-    assert (
-        "[enumerate-headings-plugin] enumerate-headings should be defined after"
-        in result.output
-    )
+    assert result.exit_code == 1, "'mkdocs build' command failed"
 
 
 def test_compatibility_material(tmp_path):