1 files changed, 25 insertions, 3 deletions
diff --git a/tools/test_format.py b/tools/test_format.py
index a0d5ba08e..69c050501 100755
--- a/tools/test_format.py
+++ b/tools/test_format.py
@@ -1,18 +1,40 @@
 #!/usr/bin/env python
-# This program fails if ./tools/format.py changes any files.
+# Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+# This program fails if ./tools/format.ts changes any files.
 
+import os
 import sys
 import util
 import sys
 import subprocess
+from distutils.spawn import find_executable
+
+
+def lookup_deno_path():
+    deno_exe = "deno" + util.executable_suffix
+    release_deno = os.path.join(util.root_path, "target", "release", deno_exe)
+    debug_deno = os.path.join(util.root_path, "target", "debug", deno_exe)
+
+    if os.path.exists(release_deno):
+        return release_deno
+    if os.path.exists(debug_deno):
+        return debug_deno
+
+    return find_executable("deno")
 
 
 def main():
-    util.run([sys.executable, "tools/format.py"])
+    deno_path = lookup_deno_path()
+
+    if not deno_path:
+        print "No available deno executable."
+        sys.exit(1)
+
+    util.run([deno_path, "--allow-run", "tools/format.ts"])
     output = util.run_output(
         ["git", "status", "-uno", "--porcelain", "--ignore-submodules"])
     if len(output) > 0:
-        print "Run tools/format.py "
+        print "Run tools/format.ts "
         print output
         sys.exit(1)