Complete Type Hints and Add support for custom tags (#13)

* Complete type hints
- Sphinx's included coverage extension was used as reference

* Add support for custom tags

README.md

@@ -28,6 +28,8 @@ These values are placed in the conf.py of your sphinx project.
     * This is not required. Link to image to show.
 * `ogp_type`
     * This sets the ogp type attribute, for more information on the types available please take a look at https://ogp.me/#types. By default it is set to `website`, which should be fine for most use cases.
+* `ogp_custom_meta_tags`
+    * This is not required. List of custom html snippets to insert.
 
 ## Example Config
 
@@ -45,4 +47,9 @@ ogp_site_url = "http://example.org/"
 ogp_image = "http://example.org/image.png"
 ogp_description_length = 300
 ogp_type = "article"
+
+ogp_custom_meta_tags = [
+    '<meta property="og:ignore_canonical" content="true" />',
+]
+
 ```

sphinxext/opengraph.py

@@ -1,8 +1,10 @@
+from typing import Any, Dict, Iterable, Sequence, Tuple
 from urllib.parse import urljoin
 import docutils.nodes as nodes
 import string
 from html.parser import HTMLParser
-
+import sphinx
+from sphinx.application import Sphinx
 
 DEFAULT_DESCRIPTION_LENGTH = 200
 
@@ -18,13 +20,13 @@ def __init__(self):
         self.text_outside_tags = ""
         self.level = 0
 
-    def handle_starttag(self, tag, attrs):
+    def handle_starttag(self, tag, attrs) -> None:
         self.level += 1
 
-    def handle_endtag(self, tag):
+    def handle_endtag(self, tag) -> None:
         self.level -= 1
 
-    def handle_data(self, data):
+    def handle_data(self, data) -> None:
         self.text += data
         if self.level == 0:
             self.text_outside_tags += data
@@ -34,7 +36,7 @@ class OGMetadataCreatorVisitor(nodes.NodeVisitor):
     Finds the title and creates a description from a doctree
     """
 
-    def __init__(self, desc_len, known_titles=None, document=None):
+    def __init__(self, desc_len: int, known_titles: Iterable[str] = None, document: nodes.document = None):
 
         # Hack to prevent requirement for the doctree to be passed in.
         # It's only used by doctree.walk(...) to print debug messages. 
@@ -135,7 +137,7 @@ def make_tag(property: str, content: str) -> str:
     return f'<meta property="{property}" content="{content}" />\n  '
 
 
-def get_tags(context, doctree, config):
+def get_tags(context: Dict[str, Any], doctree: nodes.document, config: Dict[str, Any]) -> str:
 
     # Set length of description
     try:
@@ -182,20 +184,24 @@ def get_tags(context, doctree, config):
     if image_url:
         tags += make_tag("og:image", image_url)
 
+    # custom tags
+    tags += '\n'.join(config['ogp_custom_meta_tags'])
+
     return tags
 
 
-def html_page_context(app, pagename, templatename, context, doctree):
+def html_page_context(app: Sphinx, pagename: str, templatename: str, context: Dict[str, Any], doctree: nodes.document) -> None:
     if doctree:
         context['metatags'] += get_tags(context, doctree, app.config)
 
 
-def setup(app):
+def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_config_value("ogp_site_url", None, "html")
     app.add_config_value("ogp_description_length", DEFAULT_DESCRIPTION_LENGTH, "html")
     app.add_config_value("ogp_image", None, "html")
     app.add_config_value("ogp_type", "website", "html")
     app.add_config_value("ogp_site_name", None, "html")
+    app.add_config_value("ogp_custom_meta_tags", [], "html")
 
     app.connect('html-page-context', html_page_context)
 

tests/roots/test-custom-tags/conf.py

@@ -0,0 +1,12 @@
+extensions = ["sphinxext.opengraph"]
+
+master_doc = "index"
+exclude_patterns = ["_build"]
+
+html_theme = "basic"
+
+ogp_site_url = "http://example.org/"
+
+ogp_custom_meta_tags = [
+    '<meta property="og:ignore_canonical" content="true" />',
+]

tests/roots/test-custom-tags/index.rst

@@ -0,0 +1 @@
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse at lorem ornare, fringilla massa nec, venenatis mi. Donec erat sapien, tincidunt nec rhoncus nec, scelerisque id diam. Orci varius natoque penatibus et magnis dis parturient mauris.

tests/test_options.py

@@ -86,3 +86,8 @@ def test_nested_list_punctuation(og_meta_tags):
 def test_skip_comments(og_meta_tags):
     assert get_tag_content(og_meta_tags, "description") == "This is text."
 
+
+@pytest.mark.sphinx("html", testroot="custom-tags")
+def test_custom_tags(og_meta_tags):
+    assert get_tag_content(og_meta_tags, "ignore_canonical") == "true"
+