diff --git a/src/formatitko/command_util.py b/src/formatitko/command_util.py
index 8b01ca2..002aa8c 100644
--- a/src/formatitko/command_util.py
+++ b/src/formatitko/command_util.py
@@ -16,9 +16,9 @@ def parse_command(code: str) -> CommandCallable:
 	for line in code_lines:
 		indented_code_lines.append(("\t" if tabs else "    ")+line)
 	code = "def command(element: Command, context: Context) -> list[Element]:\n"+"\n".join(indented_code_lines)
-	globals = command_env.__dict__
-	exec(code, globals)
-	return globals["command"]
+	command_env = command_env.__dict__
+	exec(code, command_env)
+	return command_env["command"]
 
 # This function is called in trasform.py, defining a command which can be
 # called later
diff --git a/src/formatitko/context.py b/src/formatitko/context.py
index ac13b7e..caa321c 100644
--- a/src/formatitko/context.py
+++ b/src/formatitko/context.py
@@ -63,7 +63,7 @@ class Context:
 				self.set_command(prefix+name, func)
 
 	def is_flag_set(self, flag: str):
-		if self.get_metadata("flags."+flag):
+		if self.get_metadata("flags."+flag) is not None:
 			if self.get_metadata("flags."+flag):
 				return True
 			else:
diff --git a/src/formatitko/images.py b/src/formatitko/images.py
index 09eb748..73220dc 100644
--- a/src/formatitko/images.py
+++ b/src/formatitko/images.py
@@ -125,7 +125,6 @@ class ImageProcessor:
 		return False
 
 	def publish_image(self, target_name, relative: bool=True) -> str:
-		import sys
 		cache_path = self.cache_dir + "/" + target_name
 		if not os.path.isfile(cache_path):
 			raise FileNotFoundError(f'Image {target_name} not cached')
diff --git a/src/formatitko/tex_generator.py b/src/formatitko/tex_generator.py
index 59f1572..c97b90d 100644
--- a/src/formatitko/tex_generator.py
+++ b/src/formatitko/tex_generator.py
@@ -123,7 +123,7 @@ class UCWTexGenerator(OutputGenerator):
 			# processing contains finding and moving them to the cache
 			# directory.
 			url = self.imageProcessor.process_image(url, ext, source_dir, **additional_args)
-		elif ext in ["svg"]:
+		elif ext in ["svg"]: # FIXME
 			url = self.imageProcessor.process_image(url, "pdf", source_dir, **additional_args)
 		elif ext in ["epdf"]:
 			url = self.imageProcessor.process_image(url, "pdf", source_dir, **additional_args)