builtin scripts

kiln-core/src/layer.rs

@@ -143,6 +143,7 @@ pub(crate) struct ObjectTemplate {
     pub opaque: bool,
     pub pushable: bool,
     pub script_name: Option<String>,
+    pub builtin_script: Option<&'static str>,
     pub tags: Vec<String>,
     pub name: Option<String>,
 }
@@ -212,6 +213,7 @@ fn resolve_entry(ch: char, e: &PaletteEntry, errors: &mut Vec<LogLine>) -> Resol
             opaque: e.opaque.unwrap_or(true),
             pushable: e.pushable.unwrap_or(false),
             script_name: e.script_name.clone(),
+            builtin_script: None,
             tags: e.tags.clone().unwrap_or_default(),
             name: e.name.clone(),
         }),
@@ -233,7 +235,24 @@ fn resolve_entry(ch: char, e: &PaletteEntry, errors: &mut Vec<LogLine>) -> Resol
         "player" => Resolved::Player,
         // Any other kind must be an archetype name.
         other => match Archetype::try_from(other) {
-            Ok(a) => Resolved::Cell(glyph_with_default(a.default_glyph()), a),
+            // Script-backed archetypes (e.g. pushers) expand into an object carrying
+            // the embedded script plus a `BUILTIN_<archetype>` tag the script reads.
+            Ok(a) => match crate::builtin_scripts::archetype_script(a) {
+                Some(src) => {
+                    let b = a.behavior();
+                    Resolved::Object(ObjectTemplate {
+                        glyph: glyph_with_default(a.default_glyph()),
+                        solid: b.solid,
+                        opaque: b.opaque,
+                        pushable: false,
+                        script_name: None,
+                        builtin_script: Some(src),
+                        tags: vec![crate::builtin_scripts::builtin_tag(a)],
+                        name: None,
+                    })
+                }
+                None => Resolved::Cell(glyph_with_default(a.default_glyph()), a),
+            },
             Err(msg) => {
                 errors.push(LogLine::error(format!(
                     "palette '{ch}': {msg}; using error block"