Infer Fuma navigation links from project metadata

docs/src/configuration.md

@@ -103,6 +103,27 @@ github_url = "https://github.com/you/project"
 toc_style = "clerk"
 ```
 
+For `fuma`, Yardang infers `github_url` from GitHub URLs in `[project.urls]`.
+It checks `Repository`, `Source`, `Source Code`, and `Homepage` first, in that
+order, then remaining entries in declaration order. Labels are case-insensitive.
+HTTP and HTTPS GitHub links are normalized to `https://github.com/owner/repo`,
+removing `.git`, trailing slashes, subpaths, queries, and fragments.
+An explicit `github_url` takes precedence; `github_url = ""` disables the link.
+Other themes receive no inferred option.
+
+Yardang also infers Fuma's `nav_links` from these case-insensitive project URL labels:
+
+| Project URL label           | Link title |
+| --------------------------- | ---------- |
+| `Homepage`                  | Home       |
+| `Documentation` (or `Docs`) | Docs       |
+
+These links appear in the header and sidebar toolbar, in Home, Docs order.
+`Documentation` takes precedence over `Docs`. Duplicate destinations, including
+the GitHub link, are omitted; trailing slashes are ignored when comparing URLs.
+Explicit `nav_links` replaces these defaults; `nav_links = []` disables them.
+Missing URLs produce no link.
+
 | Option                                       | Default   | Description                                                                            |
 | -------------------------------------------- | --------- | -------------------------------------------------------------------------------------- |
 | `layout`                                     | `docs`    | `docs` puts the header beside the sidebar; `notebook` spans it across the top.         |
@@ -114,7 +135,7 @@ toc_style = "clerk"
 | `default_open_level`                         | `1`       | Sidebar folder depth expanded by default.                                              |
 | `github_url`                                 | —         | Adds a GitHub link, and an "Edit this page" link.                                      |
 | `edit_page_url_template`                     | —         | Overrides the edit link, e.g. `https://host/edit/main/{filename}`.                     |
-| `nav_links`                                  | —         | Header links, as `[{title, url}]` or `"Title\|url, Title\|url"`.                       |
+| `nav_links`                                  | —         | Header and sidebar toolbar links, as `[{title, url}]` or `"Title\|url, Title\|url"`.   |
 | `sidebar_tabs`                               | —         | Navigator entries under the search box, as `[{title, url, description, icon, match}]`. |
 | `announcement`                               | —         | Banner text shown above the header.                                                    |
 | `footer_text`                                | —         | Extra line in the footer.                                                              |

pyproject.toml

@@ -98,6 +98,7 @@ yardang = "yardang.cli:main"
 [project.urls]
 Repository = "https://github.com/python-project-templates/yardang"
 Homepage = "https://github.com/python-project-templates/yardang"
+Documentation = "https://yardang.python-templates.dev"
 
 [tool.bumpversion]
 current_version = "0.10.3"
@@ -203,7 +204,6 @@ pages = [
 ]
 use-autoapi = false
 html_extra_path = ["docs/examples"]
-html_theme_options = { github_url = "https://github.com/python-project-templates/yardang" }
 
 [tool.yardang.breathe]
 projects = { calculator = "examples/cpp/xml" }

yardang/build.py

@@ -5,6 +5,7 @@
 from contextlib import contextmanager
 from pathlib import Path
 from tempfile import TemporaryDirectory
+from urllib.parse import urlsplit
 
 from jinja2 import Environment, FileSystemLoader
 
@@ -25,6 +26,19 @@ def theme_module(theme: str) -> str:
     return _THEME_MODULES.get(theme, theme)
 
 
+def _github_repository_url(urls: dict[str, str]) -> str | None:
+    """Find a GitHub repository in project URLs, preferring source links."""
+    urls = {label.lower(): url for label, url in urls.items()}
+    candidates = [urls.get(label, "") for label in ("repository", "source", "source code", "homepage")]
+    for url in candidates + list(urls.values()):
+        if not url.lower().startswith(("https://github.com/", "http://github.com/")):
+            continue
+        parts = urlsplit(url).path.strip("/").split("/")
+        if len(parts) >= 2 and parts[0] and parts[1]:
+            return f"https://github.com/{parts[0]}/{parts[1].removesuffix('.git')}"
+    return None
+
+
 def _resolve_custom_asset(value: str | Path | None, theme: str | None, extension: str, *, assets_dir: Path) -> str | None:
     """Resolve custom CSS/JS content for the docs build.
 
@@ -408,6 +422,24 @@ def customize(args):
             if configuration_args[config_option] is None:
                 configuration_args[config_option] = default
 
+        if theme == "fuma":
+            project_urls = get_config(section="urls", base="project") or {}
+            theme_options = configuration_args["html_theme_options"]
+            if "github_url" not in theme_options:
+                github_url = _github_repository_url(project_urls)
+                if github_url:
+                    theme_options["github_url"] = github_url
+            if "nav_links" not in theme_options:
+                urls = {label.lower(): url for label, url in project_urls.items()}
+                links = []
+                seen = {theme_options.get("github_url", "").rstrip("/")}
+                for link_title, url in (("Home", urls.get("homepage")), ("Docs", urls.get("documentation") or urls.get("docs"))):
+                    if url and url.rstrip("/") not in seen:
+                        links.append({"title": link_title, "url": url})
+                        seen.add(url.rstrip("/"))
+                if links:
+                    theme_options["nav_links"] = links
+
         if existing_source:
             for option in ("html_static_path", "html_extra_path"):
                 configuration_args[option] = [str(Path(source_dir) / path) for path in configuration_args[option]]

yardang/tests/test_themes.py

@@ -1,8 +1,11 @@
+import ast
 import os
 from pathlib import Path
 from unittest.mock import patch
 
 import pytest
+import toml
+from sphinx.cmd.build import build_main
 
 import yardang.build as build_module
 from yardang.build import BUNDLED_THEMES, _resolve_custom_asset, generate_docs_configuration
@@ -85,6 +88,135 @@ def test_unconfigured_theme_is_fuma(self, tmp_path):
         assert "sphinx_fuma" in conf
 
 
+class TestProjectLinks:
+    @pytest.fixture
+    def project(self, tmp_path, monkeypatch):
+        monkeypatch.chdir(tmp_path)
+        (tmp_path / "README.md").write_text("# Test Project\n")
+        return toml.loads(MINIMAL_PYPROJECT)
+
+    def _options(self, project, **kwargs):
+        Path("pyproject.toml").write_text(toml.dumps(project))
+        with generate_docs_configuration(**kwargs) as config_dir:
+            conf = Path(config_dir, "conf.py").read_text()
+        line = next(line for line in conf.splitlines() if line.startswith("html_theme_options = "))
+        return ast.literal_eval(line.split(" = ", 1)[1])
+
+    @pytest.mark.parametrize(
+        ("urls", "expected"),
+        [
+            ({}, {}),
+            ({"Homepage": "https://example.com"}, {}),
+            ({"Repository": "https://gitlab.com/owner/repo"}, {}),
+            ({"Homepage": "https://owner.github.io/repo"}, {}),
+            ({"Repository": "https://github.com.evil.test/owner/repo"}, {}),
+            ({"Repository": "https://github.com/owner"}, {}),
+            ({"Repository": "ftp://github.com/owner/repo"}, {}),
+            ({"Repository": "https://github.com/owner/repo"}, {"github_url": "https://github.com/owner/repo"}),
+            ({"Homepage": "https://github.com/owner/repo/"}, {"github_url": "https://github.com/owner/repo"}),
+            ({"Source Code": "https://github.com/owner/repo.git"}, {"github_url": "https://github.com/owner/repo"}),
+            ({"Bug Tracker": "https://github.com/owner/repo/issues?q=open#top"}, {"github_url": "https://github.com/owner/repo"}),
+            (
+                {"Homepage": "https://github.com/owner/home", "rEpOsItOrY": "https://github.com/owner/repo"},
+                {"github_url": "https://github.com/owner/repo"},
+            ),
+            (
+                {"Homepage": "https://github.com/owner/home", "Source": "https://github.com/owner/repo"},
+                {"github_url": "https://github.com/owner/repo"},
+            ),
+            (
+                {"Repository": "https://example.com/repo", "Homepage": "https://github.com/owner/repo"},
+                {"github_url": "https://github.com/owner/repo"},
+            ),
+        ],
+    )
+    def test_infers_github_repository(self, project, urls, expected):
+        project["project"]["urls"] = urls
+        assert self._options(project).get("github_url") == expected.get("github_url")
+
+    @pytest.mark.parametrize(
+        ("urls", "expected"),
+        [
+            ({}, []),
+            ({"Homepage": "https://example.com"}, [{"title": "Home", "url": "https://example.com"}]),
+            ({"Documentation": "https://docs.example.com"}, [{"title": "Docs", "url": "https://docs.example.com"}]),
+            ({"Docs": "https://docs.example.com"}, [{"title": "Docs", "url": "https://docs.example.com"}]),
+            (
+                {"hOmEpAgE": "https://example.com", "dOcUmEnTaTiOn": "https://docs.example.com/guide"},
+                [{"title": "Home", "url": "https://example.com"}, {"title": "Docs", "url": "https://docs.example.com/guide"}],
+            ),
+            (
+                {"Docs": "https://old.example.com", "Documentation": "https://docs.example.com"},
+                [{"title": "Docs", "url": "https://docs.example.com"}],
+            ),
+            (
+                {"Homepage": "https://example.com/", "Documentation": "https://example.com"},
+                [{"title": "Home", "url": "https://example.com/"}],
+            ),
+            ({"Homepage": "https://github.com/owner/repo/"}, []),
+        ],
+    )
+    def test_infers_home_and_docs_links(self, project, urls, expected):
+        project["project"]["urls"] = urls
+        assert self._options(project).get("nav_links", []) == expected
+
+    @pytest.mark.parametrize("nav_links", [[], [{"title": "Blog", "url": "https://example.com/blog"}], "Blog|https://example.com/blog"])
+    @pytest.mark.parametrize("option_key", ["html_theme_options", "html-theme-options"])
+    def test_explicit_navigation_takes_precedence(self, project, nav_links, option_key):
+        project["project"]["urls"] = {
+            "Repository": "https://github.com/owner/repo",
+            "Homepage": "https://example.com",
+            "Documentation": "https://docs.example.com",
+        }
+        project["tool"]["yardang"][option_key] = {"nav_links": nav_links}
+        assert self._options(project) == {"nav_links": nav_links, "github_url": "https://github.com/owner/repo"}
+
+    @pytest.mark.parametrize("github_url", ["https://github.com/other/repo", ""])
+    @pytest.mark.parametrize("option_key", ["html_theme_options", "html-theme-options"])
+    def test_explicit_options_take_precedence(self, project, github_url, option_key):
+        project["project"]["urls"] = {"Repository": "https://github.com/owner/repo", "Homepage": "https://example.com"}
+        options = {"github_url": github_url, "toc_style": "clerk"}
+        project["tool"]["yardang"][option_key] = options
+        assert self._options(project) == {**options, "nav_links": [{"title": "Home", "url": "https://example.com"}]}
+
+    @pytest.mark.parametrize("theme", [theme for theme in BUNDLED_THEMES if theme != "fuma"])
+    def test_other_themes_do_not_receive_project_links(self, project, theme):
+        project["project"]["urls"] = {
+            "Repository": "https://github.com/owner/repo",
+            "Homepage": "https://example.com",
+            "Documentation": "https://docs.example.com",
+        }
+        assert self._options(project, theme=theme) == {}
+
+    def test_custom_config_base_and_existing_options(self, project):
+        project["project"]["urls"] = {"Repository": "https://github.com/owner/repo", "Documentation": "https://docs.example.com"}
+        project["tool"]["custom"] = project["tool"].pop("yardang")
+        project["tool"]["custom"]["html-theme-options"] = {"toc_style": "clerk"}
+        assert self._options(project, config_base="tool.custom") == {
+            "toc_style": "clerk",
+            "github_url": "https://github.com/owner/repo",
+            "nav_links": [{"title": "Docs", "url": "https://docs.example.com"}],
+        }
+
+    def test_inferred_urls_render_project_links(self, project, tmp_path):
+        project["project"]["urls"] = {
+            "Repository": "https://github.com/owner/repo",
+            "Homepage": "https://example.com",
+            "Documentation": "https://docs.example.com",
+        }
+        self._options(project)
+        output = tmp_path / "html"
+        with generate_docs_configuration(html_output_dir=str(output)) as config_dir:
+            result = build_main(["-q", "-b", "html", "-c", str(config_dir), ".", str(output)])
+        assert result == 0
+        html = (output / "index.html").read_text()
+        assert "<title>Test Project" in html
+        assert 'href="https://github.com/owner/repo"' in html
+        assert 'href="https://github.com/owner/repo/edit/HEAD/index.md"' in html
+        assert html.count('href="https://example.com" target="_blank" rel="noopener">Home</a>') == 2
+        assert html.count('href="https://docs.example.com" target="_blank" rel="noopener">Docs</a>') == 2
+
+
 class TestResolveCustomAsset:
     """Layered resolution of bundled and user-supplied CSS/JS."""