Make sure titles are not redundant with breadcrumbs

The logic for the various titles on any given page is:

    ∃README
        ∃title block
            <title>         ⇒ title block
            <header> <h1>   ⇒ title block
            TOC <h1>        ⇒ "Index for {target}"
        ∄title block
            <title>         ⇒ "{target}" or "README"
            <header> <h1>   ⇒ ∅
            TOC <h1>        ⇒ "Index for {target}"

    ∄README
        <title>         ⇒ "Index for {target}"
        <header> <h1>   ⇒ "Index"
        TOC <h1>        ⇒ ∅

1 files changed, 6 insertions, 4 deletions

diff --git a/repo/www/helpers.py b/repo/www/helpers.py
index 80b8857..3d412b4 100644
--- a/repo/www/helpers.py
+++ b/repo/www/helpers.py
@@ -56,8 +56,8 @@ def deserialize_directories(directories):
     }
 
 
-def pandoc(page, output, template, filters, stylesheets, title=None,
-           site_title=None, include_after=(), variables=None):
+def pandoc(page, output, template, filters, stylesheets, site_title=None,
+           include_after=(), variables=None, metadata=None):
     cmd = (
         'pandoc', '-s', page, '-o', output, '--template', template,
         *chain(*(('--lua-filter', f) for f in filters)),
@@ -65,14 +65,16 @@ def pandoc(page, output, template, filters, stylesheets, title=None,
         *chain(*(('--include-after-body', f) for f in include_after))
     )
 
-    if title is not None:
-        cmd += ('-M', f'title={title}')
     if site_title is not None:
         cmd += ('-T', site_title)
     if variables is not None:
         cmd += tuple(chain(
             *(('-V', f'{k}={v}') for k, v in variables.items())
         ))
+    if metadata is not None:
+        cmd += tuple(chain(
+            *(('-M', f'{k}={v}') for k, v in metadata.items())
+        ))
 
     environ['LUA_PATH'] = '.cache/?.lua;;'
     run(cmd, check=True)