Fix node type resolution (#714)

Fixes #712 and #713.

src/config.rs

@@ -104,7 +104,7 @@ impl NodeTypesConfig {
             node_type = node_type.extend(conf);
         }
 
-        if let Some(conf) = self.extension.get(&node.extension) {
+        if let (Some(conf), false) = (self.extension.get(&node.extension), node.is_dir) {
             node_type = node_type.extend(conf);
         }
 

src/lua/util.rs

@@ -160,7 +160,7 @@ pub fn is_dir<'a>(util: Table<'a>, lua: &Lua) -> Result<Table<'a>> {
 /// ```
 pub fn is_file<'a>(util: Table<'a>, lua: &Lua) -> Result<Table<'a>> {
     let func =
-        lua.create_function(move |_, path: String| Ok(PathBuf::from(path).is_dir()))?;
+        lua.create_function(move |_, path: String| Ok(PathBuf::from(path).is_file()))?;
     util.set("is_file", func)?;
     Ok(util)
 }