feat: Support file descriptions

Issue-6: #6
PR-8: #8
Co-authored-by: Timothée Mazzucotelli <dev@pawamoy.fr>

Author: logan-markewich

README.md

@@ -31,8 +31,8 @@ plugins:
     markdown_description: Long description of my project.
     sections:
       Usage documentation:
-      - file1.md
-      - file2.md
+      - file1.md: Description of file1
+      - file2.md  # Descriptions are optional.
 ```
 
 The resulting `/llms.txt` file will be available at the root of your documentation. With the previous example, it will be accessible at https://myproject.com/llms.txt and will contain the following:
@@ -46,7 +46,7 @@ Long description of my project.
 
 ## Usage documentation
 
-- [File1 title](https://myproject.com/file1.md)
+- [File1 title](https://myproject.com/file1.md): Description of file1
 - [File2 title](https://myproject.com/file2.md)
 ```
 
@@ -59,7 +59,7 @@ plugins:
 - llmstxt:
     sections:
       Usage documentation:
-      - index.md
+      - index.md: Main documentation page
       - usage/*.md
 ```
 

src/mkdocs_llmstxt/_internal/config.py

@@ -13,4 +13,12 @@ class _PluginConfig(BaseConfig):
     preprocess = mkconf.Optional(mkconf.File(exists=True))
     markdown_description = mkconf.Optional(mkconf.Type(str))
     full_output = mkconf.Optional(mkconf.Type(str))
-    sections = mkconf.DictOfItems(mkconf.ListOfItems(mkconf.Type(str)))
+    sections = mkconf.DictOfItems(
+        # Each list item can either be:
+        #
+        # - a string representing the source file path (possibly with glob patterns)
+        # - a mapping where the single key is the file path and the value is its description.
+        #
+        # We therefore accept both `str` and `dict` values.
+        mkconf.ListOfItems(mkconf.Type((str, dict))),
+    )

src/mkdocs_llmstxt/_internal/plugin.py

@@ -36,6 +36,7 @@ class _MDPageInfo(NamedTuple):
     path_md: Path
     md_url: str
     content: str
+    description: str
 
 
 class MkdocsLLMsTxtPlugin(BasePlugin[_PluginConfig]):
@@ -56,13 +57,21 @@ class MkdocsLLMsTxtPlugin(BasePlugin[_PluginConfig]):
     md_pages: dict[str, list[_MDPageInfo]]
     """Dictionary mapping section names to a list of page infos."""
 
-    def _expand_inputs(self, inputs: list[str], page_uris: list[str]) -> list[str]:
-        expanded: list[str] = []
-        for input_file in inputs:
+    _sections: dict[str, dict[str, str]]
+
+    def _expand_inputs(self, inputs: list[str | dict[str, str]], page_uris: list[str]) -> dict[str, str]:
+        expanded: dict[str, str] = {}
+        for input_item in inputs:
+            if isinstance(input_item, dict):
+                input_file, description = next(iter(input_item.items()))
+            else:
+                input_file = input_item
+                description = ""
             if "*" in input_file:
-                expanded.extend(fnmatch.filter(page_uris, input_file))
+                for match in fnmatch.filter(page_uris, input_file):
+                    expanded[match] = description
             else:
-                expanded.append(input_file)
+                expanded[input_file] = description
         return expanded
 
     def on_config(self, config: MkDocsConfig) -> MkDocsConfig | None:
@@ -81,6 +90,7 @@ def on_config(self, config: MkDocsConfig) -> MkDocsConfig | None:
         if config.site_url is None:
             raise ValueError("'site_url' must be set in the MkDocs configuration to be used with the 'llmstxt' plugin")
         self.mkdocs_config = config
+
         # A `defaultdict` could be used, but we need to retain the same order between `config.sections` and `md_pages`
         # (which wouldn't be guaranteed when filling `md_pages` in `on_page_content()`).
         self.md_pages = {section: [] for section in self.config.sections}
@@ -100,10 +110,10 @@ def on_files(self, files: Files, *, config: MkDocsConfig) -> Files | None:  # no
             Modified collection or none.
         """
         page_uris = list(files.src_uris)
-
-        for section_name, file_list in list(self.config.sections.items()):
-            self.config.sections[section_name] = self._expand_inputs(file_list, page_uris=page_uris)
-
+        self._sections = {
+            section_name: self._expand_inputs(file_list, page_uris=page_uris)  # type: ignore[arg-type]
+            for section_name, file_list in self.config.sections.items()
+        }
         return files
 
     def on_page_content(self, html: str, *, page: Page, **kwargs: Any) -> str | None:  # noqa: ARG002
@@ -115,8 +125,9 @@ def on_page_content(self, html: str, *, page: Page, **kwargs: Any) -> str | None
             html: The rendered HTML.
             page: The page object.
         """
-        for section_name, file_list in self.config.sections.items():
-            if page.file.src_uri in file_list:
+        src_uri = page.file.src_uri
+        for section_name, files in self._sections.items():
+            if src_uri in files:
                 path_md = Path(page.file.abs_dest_path).with_suffix(".md")
                 page_md = _generate_page_markdown(
                     html,
@@ -138,10 +149,11 @@ def on_page_content(self, html: str, *, page: Page, **kwargs: Any) -> str | None
 
                 self.md_pages[section_name].append(
                     _MDPageInfo(
-                        title=page.title if page.title is not None else page.file.src_uri,
+                        title=page.title if page.title is not None else src_uri,
                         path_md=path_md,
                         md_url=md_url,
                         content=page_md,
+                        description=files[src_uri],
                     ),
                 )
 
@@ -169,10 +181,10 @@ def on_post_build(self, *, config: MkDocsConfig, **kwargs: Any) -> None:  # noqa
 
         for section_name, file_list in self.md_pages.items():
             markdown += f"## {section_name}\n\n"
-            for page_title, path_md, md_url, content in file_list:
+            for page_title, path_md, md_url, content, desc in file_list:
                 path_md.write_text(content, encoding="utf8")
                 _logger.debug(f"Generated MD file to {path_md}")
-                markdown += f"- [{page_title}]({md_url})\n"
+                markdown += f"- [{page_title}]({md_url}){(': ' + desc) if desc else ''}\n"
             markdown += "\n"
 
         output_file.write_text(markdown, encoding="utf8")

tests/conftest.py

@@ -1 +1,48 @@
 """Configuration for the pytest test suite."""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import pytest
+from mkdocs.config.defaults import MkDocsConfig
+
+if TYPE_CHECKING:
+    from mkdocs_llmstxt._internal.plugin import MkdocsLLMsTxtPlugin
+
+
+@pytest.fixture(name="mkdocs_conf")
+def fixture_mkdocs_conf(request: pytest.FixtureRequest, tmp_path: Path) -> MkDocsConfig:
+    """Yield a MkDocs configuration object."""
+    while hasattr(request, "_parent_request") and hasattr(request._parent_request, "_parent_request"):
+        request = request._parent_request
+    params = getattr(request, "param", {})
+    config = params.get("config", {})
+    pages = params.get("pages", {})
+    conf = MkDocsConfig()
+    conf.load_dict(
+        {
+            "site_name": "Test Project",
+            "site_url": "https://example.org/",
+            "site_dir": str(tmp_path / "site"),
+            "docs_dir": str(tmp_path / "docs"),
+            **config,
+        },
+    )
+    Path(conf.docs_dir).mkdir(exist_ok=True)
+    for page, content in pages.items():
+        page_file = Path(conf.docs_dir, page)
+        page_file.parent.mkdir(exist_ok=True)
+        page_file.write_text(content)
+    assert conf.validate() == ([], [])
+    if "toc" not in conf.markdown_extensions:
+        # Guaranteed to be added by MkDocs.
+        conf.markdown_extensions.insert(0, "toc")
+    return conf
+
+
+@pytest.fixture(name="plugin")
+def fixture_plugin(mkdocs_conf: MkDocsConfig) -> MkdocsLLMsTxtPlugin:
+    """Return a plugin instance."""
+    return mkdocs_conf.plugins["llmstxt"]  # type: ignore[return-value]

tests/test_plugin.py

@@ -1,11 +1,57 @@
 """Tests for the plugin."""
 
+from pathlib import Path
+
 import pytest
-from duty.tools import mkdocs
+from mkdocs.commands.build import build
+from mkdocs.config.defaults import MkDocsConfig
+
+
+@pytest.mark.parametrize(
+    "mkdocs_conf",
+    [
+        {
+            "config": {
+                "plugins": [
+                    {
+                        "llmstxt": {
+                            "full_output": "llms-full.txt",
+                            "sections": {
+                                "Index": ["index.md"],
+                                "Usage": [{"page1.md": "Some usage docs."}],
+                            },
+                        },
+                    },
+                ],
+            },
+            "pages": {
+                "index.md": "# Hello world",
+                "page1.md": "# Usage\n\nSome paragraph.",
+            },
+        },
+    ],
+    indirect=["mkdocs_conf"],
+)
+def test_plugin(mkdocs_conf: MkDocsConfig) -> None:
+    """Test that page descriptions are correctly handled and included in output."""
+    build(config=mkdocs_conf)
+
+    llmstxt = Path(mkdocs_conf.site_dir, "llms.txt")
+    assert llmstxt.exists()
+    llmstxt_content = llmstxt.read_text()
+    assert "Some usage docs." in llmstxt_content
+    assert "Some paragraph." not in llmstxt_content
+
+    llmsfulltxt = Path(mkdocs_conf.site_dir, "llms-full.txt")
+    assert llmsfulltxt.exists()
+    llmsfulltxt_content = llmsfulltxt.read_text()
+    assert "Some usage docs." not in llmsfulltxt_content
+    assert "Some paragraph." in llmsfulltxt_content
 
+    indexmd = Path(mkdocs_conf.site_dir, "index.md")
+    assert indexmd.exists()
+    assert "Hello world" in indexmd.read_text()
 
-def test_plugin() -> None:
-    """Run the plugin."""
-    with pytest.raises(expected_exception=SystemExit) as exc:
-        mkdocs.build()()
-    assert exc.value.code == 0
+    page1md = Path(mkdocs_conf.site_dir, "page1/index.md")
+    assert page1md.exists()
+    assert "Some paragraph." in page1md.read_text()