From 5f3a256425f4fa99fd3e5363418c5978659cecf3 Mon Sep 17 00:00:00 2001
From: Adin Scannell <ascannell@google.com>
Date: Wed, 29 Apr 2020 18:54:48 -0700
Subject: Add support for kramdown TOC.

---
 website/defs.bzl | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'website')

diff --git a/website/defs.bzl b/website/defs.bzl
index fe711d5d1..64a9d43e3 100644
--- a/website/defs.bzl
+++ b/website/defs.bzl
@@ -130,7 +130,14 @@ layout: {layout}"""
             builder_content += [header.format(**args)]
             builder_content += ["---"]
             builder_content += ["EOF"]
-            builder_content += ["grep -v -E '^# ' %s >>$T/%s || true" % (f.path, f.short_path)]
+
+            # To generate the final page, we need to strip out the title (which
+            # was pulled above to generate the annotation in the frontmatter,
+            # and substitute the [TOC] tag with the {% toc %} plugin tag. Note
+            # that the pipeline here is almost important, as the grep will
+            # return non-zero if the file is empty, but we ignore that within
+            # the pipeline.
+            builder_content += ["grep -v -E '^# ' %s | sed -e 's|^\\[TOC\\]$|- TOC\\n{:toc}|' >>$T/%s" % (f.path, f.short_path)]
 
     builder_content += ["declare -r filename=$(readlink -m %s)" % tarball.path]
     builder_content += ["(cd $T && tar -zcf \"${filename}\" .)\n"]
-- 
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