allow syntaxes to be loaded from disk or default binary dump for syntest

Author: keith-hall

examples/syntest.rs

@@ -207,16 +207,34 @@ fn test_file(ss: &SyntaxSet, path: &Path, parse_test_lines: bool) -> Result<Synt
 }
 
 fn main() {
-    let ss = SyntaxSet::load_defaults_newlines(); // note we load the version with newlines
-
     let args: Vec<String> = std::env::args().collect();
-    let path = if args.len() < 2 {
+    let tests_path = if args.len() < 2 {
         "."
     } else {
         &args[1]
     };
+    let syntaxes_path = if args.len() == 3 {
+        &args[2]
+    } else {
+        ""
+    };
+
+    // load the syntaxes from disk if told to
+    // (as opposed to from the binary dumps)
+    // this helps to ensure that a recompile isn't needed
+    // when using this for syntax development
+    let mut ss = if syntaxes_path.is_empty() {
+        SyntaxSet::load_defaults_newlines() // note we load the version with newlines
+    } else {
+        SyntaxSet::new()
+    };
+    if !syntaxes_path.is_empty() {
+        println!("loading syntax definitions from {}", syntaxes_path);
+        ss.load_syntaxes(&syntaxes_path, true).unwrap(); // note that we load the version with newlines
+        ss.link_syntaxes();
+    }
 
-    let exit_code = recursive_walk(&ss, &path);
+    let exit_code = recursive_walk(&ss, &tests_path);
     std::process::exit(exit_code);
 
 }