gnu: fifengine: Fix runtime error when using Python 3.9 or newer.

* gnu/packages/patches/fifengine-python-3.9-compat.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/games.scm (fifengine)[source]: Apply it.

Change-Id: I61001d6b87db00c71f1e2e6ca3bac8581e941451
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

2 files changed, 83 insertions, 1 deletions

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index cd20c64dc4..f0f9061717 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -4118,7 +4118,8 @@ Widgets, and allows users to create more.")
                                   "fifengine/tar.gz/" version))
               (file-name (string-append name "-" version ".tar.gz"))
               (patches (search-patches "fifengine-swig-compat.patch"
-                                       "fifengine-boost-compat.patch"))
+                                       "fifengine-boost-compat.patch"
+                                       "fifengine-python-3.9-compat.patch"))
               (sha256
                (base32
                 "1y4grw25cq5iqlg05rnbyxw1njl11ypidnlsm3qy4sm3xxdvb0p8"))))
diff --git a/gnu/packages/patches/fifengine-python-3.9-compat.patch b/gnu/packages/patches/fifengine-python-3.9-compat.patch
new file mode 100644
index 0000000000..2def4681cd
--- /dev/null
+++ b/gnu/packages/patches/fifengine-python-3.9-compat.patch
@@ -0,0 +1,81 @@
+Fix runtime error when using Python 3.9 or newer.
+
+Taken from upstream:
+https://github.com/fifengine/fifengine/commit/cf295fd98a8fba080f6305c27be56d10ab7ce94d
+
+diff --git a/engine/python/fife/extensions/serializers/simplexml.py b/engine/python/fife/extensions/serializers/simplexml.py
+index c4e10f4f8..d05567936 100644
+--- a/engine/python/fife/extensions/serializers/simplexml.py
++++ b/engine/python/fife/extensions/serializers/simplexml.py
+@@ -200,7 +200,7 @@ def get(self, module, name, defaultValue=None):
+ 		#get the module tree: for example find tree under module FIFE
+ 		moduleTree = self._getModuleTree(module)
+ 		element = None
+-		for e in moduleTree.getchildren():
++		for e in moduleTree:
+ 			if e.tag == "Setting" and e.get("name", "") == name:
+ 				element = e
+ 				break
+@@ -275,7 +275,7 @@ def set(self, module, name, value, extra_attrs={}):
+ 			e_type = "str"
+ 			value = str(value)
+ 
+-		for e in moduleTree.getchildren():
++		for e in moduleTree:
+ 			if e.tag != "Setting": continue
+ 			if e.get("name", "") == name:
+ 				e.text = value
+@@ -305,7 +305,7 @@ def remove(self, module, name):
+ 
+ 		moduleTree = self._getModuleTree(module)
+ 
+-		for e in moduleTree.getchildren():
++		for e in moduleTree:
+ 			if e.tag != "Setting": continue
+ 			if e.get("name", "") == name:
+ 				moduleTree.remove(e)
+@@ -321,7 +321,7 @@ def getModuleNameList(self):
+ 			self._initialized = True
+ 
+ 		moduleNames = []
+-		for c in self._root_element.getchildren():
++		for c in self._root_element:
+ 			if c.tag == "Module":
+ 				name = c.get("name","")
+ 				if not isinstance(name, basestring):
+@@ -344,7 +344,7 @@ def getAllSettings(self, module):
+ 		
+ 		# now from the tree read every value, and put the necessary values
+ 		# to the list
+-		for e in moduleTree.getchildren():
++		for e in moduleTree:
+ 			if e.tag == "Setting":
+ 				name = e.get("name", "")
+ 	
+@@ -383,7 +383,7 @@ def _validateTree(self):
+ 		
+ 		Raises an InvalidFormat exception if there is a format error.
+ 		"""
+-		for c in self._root_element.getchildren():
++		for c in self._root_element:
+ 			if c.tag != "Module":
+ 				raise InvalidFormat("Invalid tag in " + self._file + \
+ 									". Expected Module, got: " + c.tag)
+@@ -391,7 +391,7 @@ def _validateTree(self):
+ 				raise InvalidFormat("Invalid tag in " + self._file + \
+ 									". Module name is empty.")
+ 			else:
+-				for e in c.getchildren():
++				for e in c:
+ 					if e.tag != "Setting":
+ 						raise InvalidFormat("Invalid tag in " + self._file + \
+ 											" in module: " + c.tag + \
+@@ -414,7 +414,7 @@ def _getModuleTree(self, module):
+ 			raise AttributeError("Settings:_getModuleTree: Invalid type for "
+ 								 "module argument.")
+ 
+-		for c in self._root_element.getchildren():
++		for c in self._root_element:
+ 			if c.tag == "Module" and c.get("name", "") == module:
+ 				return c
+