nixos-render-docs: always render links bold in manpages

no reason to differentiate between links by source of their label. this
feature seems to be mostly used to change labels of links to other
options, but this should ultimately be done by auto-linking from
{option}`...`. at some point we may want to introduce a warning when
this pattern is encountered, but there's a lot to work out still before
we can do that.

pkgs/tools/nix/nixos-render-docs/src/nixos_render_docs/manpage.py

@@ -149,14 +149,12 @@ class ManpageRenderer(Renderer):
     def link_open(self, token: Token, tokens: Sequence[Token], i: int, options: OptionsDict,
                   env: MutableMapping[str, Any]) -> str:
         href = cast(str, token.attrs['href'])
-        (text, font) = ("", "\\fB")
+        text = ""
         if tokens[i + 1].type == 'link_close' and href in self._href_targets:
             # TODO error or warning if the target can't be resolved
             text = self._href_targets[href]
-        elif href in self._href_targets:
-            font = "\\fR" # TODO docbook renders these links differently for some reason
-        self._font_stack.append(font)
-        return f"{font}{text}\0 <"
+        self._font_stack.append("\\fB")
+        return f"\\fB{text}\0 <"
     def link_close(self, token: Token, tokens: Sequence[Token], i: int, options: OptionsDict,
                    env: MutableMapping[str, Any]) -> str:
         self._font_stack.pop()

pkgs/tools/nix/nixos-render-docs/src/tests/test_manpage.py

@@ -26,4 +26,4 @@ def test_fonts() -> None:
 def test_expand_link_targets() -> None:
     c = Converter({}, { '#foo1': "bar", "#foo2": "bar" })
     assert (c._render("[a](#foo1) [](#foo2) [b](#bar1) [](#bar2)") ==
-            "\\fRa\\fR \\fBbar\\fR \\fBb\\fR \\fB\\fR")
+            "\\fBa\\fR \\fBbar\\fR \\fBb\\fR \\fB\\fR")