Add a param shortcode to work around the escaped characters in hashes

diff --git a/site/layouts/shortcodes/param.html b/site/layouts/shortcodes/param.html
new file mode 100644 (file)
index 0000000..50e2060
--- /dev/null
+++ b/site/layouts/shortcodes/param.html
@@ -0,0 +1,12 @@
+{{- /*
+  Work around wrong escapes in integrity attributes.
+*/ -}}
+
+{{- $name := .Get 0 -}}
+{{- with $name -}}
+{{- $value := $.Page.Param . -}}
+{{- if in $name "_hash" -}}
+  {{- $value = $value | safeHTML -}}
+{{- end -}}
+{{- with $value }}{{ . }}{{ else }}{{ errorf "Param %q not found: %s" $name $.Position }}{{ end -}}
+{{- else }}{{ errorf "Missing param key: %s" $.Position }}{{ end -}}