implement 'globals' option

gallery_dl/__init__.py

@@ -110,6 +110,11 @@ def main():
             from . import formatter
             formatter._SEPARATOR = separator
 
+        # eval globals
+        path = config.get((), "globals")
+        if path:
+            util.GLOBALS = util.import_file(path).__dict__
+
         # loglevels
         output.configure_logging(args.loglevel)
         if args.loglevel >= logging.ERROR:

gallery_dl/util.py

@@ -619,9 +619,28 @@ GLOBALS = {
 }
 
 
-def compile_expression(expr, name="<expr>", globals=GLOBALS):
+def compile_expression(expr, name="<expr>", globals=None):
     code_object = compile(expr, name, "eval")
-    return functools.partial(eval, code_object, globals)
+    return functools.partial(eval, code_object, globals or GLOBALS)
+
+
+def import_file(path):
+    """Import a Python module from a filesystem path"""
+    path, name = os.path.split(path)
+
+    name, sep, ext = name.rpartition(".")
+    if not sep:
+        name = ext
+
+    if path:
+        path = expand_path(path)
+        sys.path.insert(0, path)
+        try:
+            return __import__(name)
+        finally:
+            del sys.path[0]
+    else:
+        return __import__(name)
 
 
 def build_duration_func(duration, min=0.0):