Check for blank line after shebang and grab actual comment block instead of hard-coded one

python/tidy/servo_tidy/tidy.py

@@ -163,13 +163,23 @@ def licensed_apache(header):
 def check_license(file_name, lines):
     if any(file_name.endswith(ext) for ext in (".toml", ".lock", ".json")):
         raise StopIteration
-    block = min(len(lines), licenseck.MAX_LICENSE_LINESPAN)
+
+    if lines[0].startswith("#!") and lines[1].strip():
+        yield (1, "missing blank line after shebang")
+
+    blank_lines = 0
+    max_blank_lines = 2 if lines[0].startswith("#!") else 1
     license_block = []
-    for l in lines[:block]:
+
+    for l in lines:
         l = l.rstrip('\n')
+        if not l.strip():
+            blank_lines += 1
+        if blank_lines >= max_blank_lines:
+            break
         line = uncomment(l)
         if line is not None:
-            license_block += [line]
+            license_block.append(line)
     contents = " ".join(license_block)
     valid_license = licensed_mpl(contents) or licensed_apache(contents)
     acknowledged_bad_license = "xfail-license" in contents