Add support for skipping files

Track files being skipped along with reason (e.g. error opening file,
file has bad syntax and can't be parsed) and include in final output.

bandit/manager.py

@@ -47,6 +47,7 @@ class BanditManager():
                             sys.exit(2)
                 except IOError as e:
                     self.logger.error("%s" % e.strerror)
+                    b_rs.skip(fname, e.strerror)
             sys.stdout.write("]\n")
             sys.stdout.flush()
         else:
@@ -63,8 +64,7 @@ class BanditManager():
             try:
                 res.visit(ast.parse("".join(fdata.readlines())))
             except SyntaxError as e:
-                self.logger.error("syntax error while parsing AST from file: %s" % fname)
-                sys.exit(2)
+                b_rs.skip(fname, "syntax error while parsing AST from file")
 
     def _init_logger(self, debug=False):
         log_level = logging.INFO

bandit/result_store.py

@@ -11,11 +11,16 @@ import utils
 class BanditResultStore():
     resstore = OrderedDict()
     count = 0
+    skipped = None
 
     def __init__(self, logger):
         self.count = 0
+        self.skipped = []
         self.logger = logger
 
+    def skip(self, filename, reason):
+        self.skipped.append((filename, reason))
+
     def add(self, context, issue):
         filename, lineno = context['filename'], context['lineno']
         (issue_type, issue_text) = issue
@@ -31,9 +36,13 @@ class BanditResultStore():
         tmpstr = ""
         if self.count > 0:
             tmpstr += "%sFiles tested (%s):%s\n\t" % (utils.color['HEADER'], len(scope), utils.color['DEFAULT']) if is_tty else "File tested (%s):\n\t" % (len(scope))
-
             tmpstr += "%s\n" % "\n\t".join(scope)
-            tmpstr += "%sTest results:%s\n" % (utils.color['HEADER'], utils.color['DEFAULT']) if is_tty else "Test results:\n"
+
+            tmpstr += "%sFiles skipped (%s):%s" % (utils.color['HEADER'], len(self.skipped), utils.color['DEFAULT']) if is_tty else "File skipped (%s):\n\t" % (len(self.skipped))
+            for (fname, reason) in self.skipped:
+                tmpstr += "\n\t%s (%s)" % (fname, reason)
+
+            tmpstr += "\n%sTest results:%s\n" % (utils.color['HEADER'], utils.color['DEFAULT']) if is_tty else "Test results:\n"
 
             for filename,issues in self.resstore.items():
                 for lineno, issue_type, issue_text in issues:

examples/nonsense.py

@@ -0,0 +1 @@
+test(hi