add trait for directive implementations

Sponsored-by: author

1 files changed, 8 insertions, 0 deletions

diff --git a/src/directive/mod.rs b/src/directive/mod.rs
index 5bc8ef6..899980d 100644
--- a/src/directive/mod.rs
+++ b/src/directive/mod.rs
@@ -10,6 +10,14 @@ pub enum Processed {
     Markdown(String),
 }
 
+trait DirectiveImplementation {
+    const REQUIRED: &'static [&'static str];
+    const ALLOWED: &'static [&'static str];
+    const ALLOW_ANY_UNNAMED: bool;
+    fn from_parsed(p: &ParsedDirective) -> Self;
+    fn process(&self, site: &Site, meta: &mut PageMeta) -> Result<String, SiteError>;
+}
+
 #[derive(Debug, Eq, PartialEq)]
 pub enum Directive {
     Simple,