feat: check for definition lists, and fail if found

Sponsored-by: author

1 files changed, 46 insertions, 0 deletions

diff --git a/riki.md b/riki.md
index 6fc0d53..e208baa 100644
--- a/riki.md
+++ b/riki.md
@@ -334,6 +334,52 @@ then AST of site/page.mdwn matches that of output/page.html
 * [x] done
 ~~~
 
+## Definition list
+
+_Requirement: Markup indicating use of a definition list should be
+flagged as an error._
+
+Justification: Neither the CommonMark specification, nor GitHub
+Flavored Markdown, supports definition lists, even though some
+Markdown variants do. The Markdown parser Riki uses doesn't support
+it.
+
+~~~scenario
+given an installed riki
+
+given file site/page.mdwn from dl-1
+when I try to run riki build --plain-body site output
+then command fails
+then stderr contains "definition list"
+
+given file site/page.mdwn from dl-2
+when I try to run riki build --plain-body site output
+then command fails
+then stderr contains "definition list"
+
+given file site/page.mdwn from dl-3
+when I run riki build --plain-body site output
+then file output/page.html contains ": bar"
+~~~
+
+~~~{#dl-1 .file}
+foo
+: bar
+~~~
+
+~~~{#dl-2 .file}
+foo
+
+: bar
+~~~
+
+~~~{#dl-3 .file}
+foo
+
+<!-- no colon at beginning of line here -->: bar
+~~~
+
+
 ## Input files other than Markdown
 
 _Requirement: Input files that aren't Markdown files must be copied