fix: Make show_vars behave properly

README.rst

@@ -67,6 +67,9 @@ directory, as returned by ``os.getcwd()`` will be used.
 If ``isolate`` is ``False``, all lines are colorized, and ``code_dir`` is
 ignored.
 
+If ``show_vars`` is ``False``, variables will not be printed in each stack
+frame.
+
 To use it in an ``except`` block::
 
     from tbvaccine import TBVaccine
@@ -76,10 +79,11 @@ To use it in an ``except`` block::
         print(TBVaccine().format_exc())
 
 
-To make it the default way of printing tracebacks, use ``add_hook()``::
+To make it the default way of printing tracebacks, use ``add_hook()`` (which
+also accepts any argument the ``TBVaccine`` class does)::
 
     import tbvaccine
-    tbvaccine.add_hook()
+    tbvaccine.add_hook(isolate=False)
 
     1 / 0
 

tbvaccine/tbv.py

@@ -68,7 +68,7 @@ def _process_var_line(self, line):
         """
         Process a line of variables in the traceback.
         """
-        if self._show_vars and self._isolate and not self._file_in_dir():
+        if self._show_vars is False or (self._isolate and not self._file_in_dir()):
             # Don't print.
             return False
         else:
@@ -197,10 +197,10 @@ def format_exc(self):
         return self._format_tb_string_with_locals(*sys.exc_info())
 
 
-def add_hook():
+def add_hook(*args, **kwargs):
     if not getattr(sys.stderr, 'isatty', lambda: False)():
         sys.stderr.write("\n\nNot an interactive session, "
                          "TBVaccine won't pretty print exceptions.\n\n")
         return
-    tbv = TBVaccine()
+    tbv = TBVaccine(*args, **kwargs)
     sys.excepthook = tbv.print_exception