refactor: don't emit parse errors on main_file ignore matches

Author: calebcartwright

src/formatting.rs

@@ -70,13 +70,17 @@ fn format_project<T: FormatHandler>(
         Ok(set) => set,
         Err(e) => return Err(ErrorKind::InvalidGlobPattern(e)),
     };
-    if config.skip_children() && ignore_path_set.is_match(&main_file) {
+    let is_ignore_match = ignore_path_set.is_match(&main_file);
+    if config.skip_children() && is_ignore_match {
         return Ok(FormatReport::new());
     }
 
     // Parse the crate.
     let source_map = Rc::new(SourceMap::new(FilePathMapping::empty()));
     let mut parse_session = make_parse_sess(source_map.clone(), config);
+    if is_ignore_match {
+        parse_session.span_diagnostic = Handler::with_emitter(true, None, silent_emitter());
+    }
     let mut report = FormatReport::new();
     let directory_ownership = input.to_directory_ownership();
     let krate = match parse_crate(