refactor(tazjin/blog): Extract post rendering to utility function r/1635

To use cheddar for both the feed & web views, the rendering function
is extracted a level up - this prevents duplicate renderer calls.

Change-Id: I31812c5c3f905f2f84914c6a8ab7c14602227be1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1710
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

1 files changed, 9 insertions, 0 deletions

diff --git a/users/tazjin/renderMarkdown.nix b/users/tazjin/renderMarkdown.nix
new file mode 100644
index 000000000000..58f29c30e0f3
--- /dev/null
+++ b/users/tazjin/renderMarkdown.nix
@@ -0,0 +1,9 @@
+# Render a Markdown file to HTML.
+{ depot, ... }:
+
+with depot.nix.yants;
+
+defun [ path drv ] (file: depot.third_party.runCommandNoCC "${file}.rendered.html" {} ''
+  cat ${file} | ${depot.tools.cheddar}/bin/cheddar --about-filter ${file} > $out
+'')
+