feat(panettone): render a subset of markdown in issue subjects r/2144

This is achieved by implementing a simple markdown renderer in CL which
has the following limitations:

* Only supports inline `code`, *emphasize 1*, _emphasize 2_ and
  ~~strikethrough~~.
* Does not support nested markup.

This allows for a relatively simple renderer which doesn't need to parse
markdown into a in-memory data structure first. The rendered result is
directly written to a stream to integrate well with cl-who which is also
reused for rendering tags and xml-escaping strings.

Fixes #90.

Change-Id: Ice88ed770b1fab6365f3b93e8663e25077befa0b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2389
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: tazjin <mail@tazj.in>

1 files changed, 2 insertions, 0 deletions

diff --git a/web/panettone/default.nix b/web/panettone/default.nix
index 8d112901ec07..4238af804af3 100644
--- a/web/panettone/default.nix
+++ b/web/panettone/default.nix
@@ -24,6 +24,7 @@ depot.nix.buildLisp.program {
     ./src/packages.lisp
     ./src/util.lisp
     ./src/css.lisp
+    ./src/inline-markdown.lisp
     ./src/authentication.lisp
     ./src/model.lisp
     ./src/irc.lisp
@@ -38,6 +39,7 @@ depot.nix.buildLisp.program {
     srcs = [
       ./test/package.lisp
       ./test/model_test.lisp
+      ./test/inline-markdown_test.lisp
     ];
 
     expression = "(fiveam:run!)";