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, 22 insertions, 17 deletions

diff --git a/repo/www/generate-index.py b/repo/www/generate-index.py
index a993c41..3bce69d 100755
--- a/repo/www/generate-index.py
+++ b/repo/www/generate-index.py
@@ -92,17 +92,14 @@ def main(arguments):
     folders, files = list_files(arguments.site_tree, target)
     pages, readme = list_pages(files)
 
+    toc_title = f'Index for {target}' if target else 'Index'
     html_toc = format_toc(folders, pages)
 
-    if target:
-        index_title = f'Index for {target}'
-        path_to_top = path.relpath('.', target)
-    else:
-        index_title = 'Index'
-        path_to_top = '.'
-
+    path_to_top = path.relpath('.', start=target)
     stylesheets = (path.join(path_to_top, s) for s in arguments.css)
+
     variables = {'crumbs': generate_crumbs(Path(target)/'index')}
+    metadata = {}
 
     if readme is not None:
         repo_top = Repo(search_parent_directories=True).working_dir
@@ -110,17 +107,20 @@ def main(arguments):
 
         # If the README doesn't have a title, give a default to pandoc
         # out-of-band.
-        page_title = None if has_title(readme_path) else 'README'
+        if not has_title(readme_path):
+            metadata['pagetitle'] = target or 'README'
 
         with NamedTemporaryFile(mode='w+') as toc:
-            toc.write('<h1>{title}</h1>\n'.format(title=index_title))
+            toc.write(f'<h1>{toc_title}</h1>\n')
             toc.write(html_toc)
             toc.flush()
 
-            pandoc(readme_path, arguments.output, arguments.template,
-                   arguments.filters, stylesheets, title=page_title,
-                   site_title=arguments.site_title, include_after=(toc.name,),
-                   variables=variables)
+            pandoc(
+                readme_path, arguments.output,
+                arguments.template, arguments.filters, stylesheets,
+                site_title=arguments.site_title, include_after=(toc.name,),
+                variables=variables, metadata=metadata
+            )
         return
 
     with NamedTemporaryFile(suffix='.md') as dummy_readme, \
@@ -128,10 +128,15 @@ def main(arguments):
         toc.write(html_toc)
         toc.flush()
 
-        pandoc(dummy_readme.name, arguments.output, arguments.template,
-               arguments.filters, stylesheets, title=index_title,
-               site_title=arguments.site_title, include_after=(toc.name,),
-               variables=variables)
+        metadata['pagetitle'] = toc_title
+        metadata['title'] = 'Index'
+
+        pandoc(
+            dummy_readme.name, arguments.output,
+            arguments.template, arguments.filters, stylesheets,
+            site_title=arguments.site_title, include_after=(toc.name,),
+            variables=variables, metadata=metadata
+        )
 
 
 if __name__ == '__main__':