Add a fail_fast option to checker for those who only case about pass/…

…fail

shaperglot/checker.py

@@ -51,7 +51,7 @@ def codepoint_for(self, glyphname):
             self._build_full_reversed_cmap()
         return self.full_reversed_cmap.get(glyphname, 0)
 
-    def check(self, lang):
+    def check(self, lang, fail_fast=False):
         self.results = Reporter()
         self.lang = lang
         for check_object in self.lang.get("shaperglot_checks", []):
@@ -60,4 +60,6 @@ def check(self, lang):
                 self.results.skip(check_name=check_object.name, message=skip_reason)
                 continue
             check_object.execute(self)
+            if fail_fast and self.results.fails:
+                return self.results
         return self.results