remove futurefuture

3 files changed, 20 insertions, 4 deletions

diff --git a/docs/CHANGES.rst b/docs/CHANGES.rst
index d735083..571ff11 100644
--- a/docs/CHANGES.rst
+++ b/docs/CHANGES.rst
@@ -4,7 +4,8 @@ Changelog
 1.0.9 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Remove futures dependency
+  [kiorky]
 
 
 1.0.8 (2021-03-06)
diff --git a/requirements/base.txt b/requirements/base.txt
index 56d1bf5..49db1a1 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,4 +1,3 @@
 python_dateutil
-future
 natsort
 -e .
diff --git a/src/croniter/croniter.py b/src/croniter/croniter.py
index af34f18..9a9d0f5 100644
--- a/src/croniter/croniter.py
+++ b/src/croniter/croniter.py
@@ -6,13 +6,13 @@ from __future__ import absolute_import, print_function, division
 import math
 import re
 import sys
+import inspect
 from time import time
 import datetime
 from dateutil.relativedelta import relativedelta
 from dateutil.tz import tzutc
 import calendar
 import natsort
-from future.utils import raise_from
 
 
 step_search_re = re.compile(r'^([^-]+)-([^-/]+)(/(\d+))?$')
@@ -21,6 +21,18 @@ star_or_int_re = re.compile(r'^(\d+|\*)$')
 VALID_LEN_EXPRESSION = [5, 6]
 
 
+def _get_caller_globals_and_locals():
+    """
+    Returns the globals and locals of the calling frame.
+
+    Is there an alternative to frame hacking here?
+    """
+    caller_frame = inspect.stack()[2]
+    myglobals = caller_frame[0].f_globals
+    mylocals = caller_frame[0].f_locals
+    return myglobals, mylocals
+
+
 class CroniterError(ValueError):
     """ General top-level Croniter base exception """
     pass
@@ -661,7 +673,11 @@ class croniter(object):
             error_type, error_instance, traceback = sys.exc_info()
             if isinstance(exc, CroniterError):
                 raise
-            raise_from(CroniterBadCronError, exc)
+            if int(sys.version[0]) >= 3:
+                globs, locs = _get_caller_globals_and_locals()
+                exec("raise CroniterBadCronError from  exc", globs, locs)
+            else:
+                raise CroniterBadCronError("{0}".format(exc))
 
     @classmethod
     def is_valid(cls, expression):