implement add_static_searcher

to facilitate compile-time includes

src/searcher.rs

@@ -40,12 +40,46 @@ impl UserData for Searcher {
     }
 }
 
+/// Like `Searcher`, but with `modules` values encoded as `&'static str`
+/// to facilitate compile-time includes of Fennel source code.
+struct StaticSearcher {
+    modules: HashMap<String, &'static str>,
+    globals: RegistryKey,
+}
+
+impl StaticSearcher {
+    fn new(modules: HashMap<String, &'static str>, globals: RegistryKey) -> Self {
+        Self { modules, globals }
+    }
+}
+
+impl UserData for StaticSearcher {
+    fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_meta_method(MetaMethod::Call, |lua_ctx, this, name: String| {
+            match this.modules.get(&name) {
+                Some(content) => Ok(Value::Function(
+                    lua_ctx
+                        .load(content)
+                        .set_name(&name)?
+                        .set_environment(lua_ctx.registry_value::<Table>(&this.globals)?)?
+                        .into_function()?,
+                )),
+                None => Ok(Value::Nil),
+            }
+        });
+    }
+}
+
 /// Extend `rlua::Context` to support `require`ing Lua modules by name.
 pub trait AddSearcher {
     /// Add a `HashMap` of Lua modules indexed by module name to Lua’s
     /// `package.searchers` table in an `rlua::Context`, with lookup
     /// functionality provided by the `rlua_searcher::Searcher` struct.
     fn add_searcher(&self, modules: HashMap<String, String>) -> Result<()>;
+
+    /// Like `add_searcher`, but with Fennel source code encoded as
+    /// `&'static str` to facilitate compile-time includes.
+    fn add_static_searcher(&self, modules: HashMap<String, &'static str>) -> Result<()>;
 }
 
 impl<'a> AddSearcher for Context<'a> {
@@ -58,4 +92,14 @@ impl<'a> AddSearcher for Context<'a> {
             .set(searchers.len()? + 1, searcher)
             .map_err(|e| e.into())
     }
+
+    fn add_static_searcher(&self, modules: HashMap<String, &'static str>) -> Result<()> {
+        let globals = self.globals();
+        let searchers: Table = globals.get::<_, Table>("package")?.get("searchers")?;
+        let registry_key = self.create_registry_value(globals)?;
+        let searcher = StaticSearcher::new(modules, registry_key);
+        searchers
+            .set(searchers.len()? + 1, searcher)
+            .map_err(|e| e.into())
+    }
 }