mautrix-telegram: fix build

With updating `pluggy` to `0.13.0`[1] the way how python modules are
imported during pytest changed which broke all modules that had a
`coding: future_fstrings` annotation at the top which used to be needed
for python <=3.5. This only affected the tests, deploying a
`mautrix-telegram` from master with `doCheck = false;` works fine.

I applied a patch for `mautrix-telegram` which drops python 3.5 compat
(this package is intended to be used as application with python 3.7, so this
should be fine on master/unstable) and modified `mautrix-appservice`
accordingly as a lot of things on master changed since their last
release, so applying a patch didn't work there.

Resolves #71996

[1] faf8cfba4e

pkgs/development/python-modules/mautrix-appservice/0001-Remove-coding-annotations.patch

@@ -0,0 +1,53 @@
+From 6750cda26821f703b120ba5c925cc696200570d3 Mon Sep 17 00:00:00 2001
+From: Maximilian Bosch <maximilian@mbosch.me>
+Date: Sat, 26 Oct 2019 10:31:02 +0200
+Subject: [PATCH] Remove coding annotations
+
+Those used to be needed for Python <=3.5. With `pluggy` 0.13.0 this breaks
+tests on newer python3 versions.
+---
+ mautrix_appservice/appservice.py  | 1 -
+ mautrix_appservice/errors.py      | 1 -
+ mautrix_appservice/intent_api.py  | 1 -
+ mautrix_appservice/state_store.py | 1 -
+ 4 files changed, 4 deletions(-)
+
+diff --git a/mautrix_appservice/appservice.py b/mautrix_appservice/appservice.py
+index 3a141b1..47e37fe 100644
+--- a/mautrix_appservice/appservice.py
++++ b/mautrix_appservice/appservice.py
+@@ -1,4 +1,3 @@
+-# -*- coding: future_fstrings -*-
+ # Partly based on github.com/Cadair/python-appservice-framework (MIT license)
+ from contextlib import contextmanager
+ from typing import Optional, Callable, Awaitable, Union
+diff --git a/mautrix_appservice/errors.py b/mautrix_appservice/errors.py
+index 90d040f..702f541 100644
+--- a/mautrix_appservice/errors.py
++++ b/mautrix_appservice/errors.py
+@@ -1,4 +1,3 @@
+-# -*- coding: future_fstrings -*-
+ from typing import Optional
+ 
+ 
+diff --git a/mautrix_appservice/intent_api.py b/mautrix_appservice/intent_api.py
+index 4021bf8..7236cbb 100644
+--- a/mautrix_appservice/intent_api.py
++++ b/mautrix_appservice/intent_api.py
+@@ -1,4 +1,3 @@
+-# -*- coding: future_fstrings -*-
+ from urllib.parse import quote as urllib_quote
+ from time import time
+ from json.decoder import JSONDecodeError
+diff --git a/mautrix_appservice/state_store.py b/mautrix_appservice/state_store.py
+index 47bb970..6ebec2a 100644
+--- a/mautrix_appservice/state_store.py
++++ b/mautrix_appservice/state_store.py
+@@ -1,4 +1,3 @@
+-# -*- coding: future_fstrings -*-
+ from typing import Optional
+ from abc import ABC, abstractmethod
+ import json
+-- 
+2.23.0
+

pkgs/development/python-modules/mautrix-appservice/default.nix

@@ -9,6 +9,10 @@ buildPythonPackage rec {
     sha256 = "60192920cff75afdd096eea3a43276e33ec15f4f00bd04d2d1dda616c84f22a5";
   };
 
+  patches = lib.optional (!(pythonOlder "3.6")) [
+    ./0001-Remove-coding-annotations.patch
+  ];
+
   propagatedBuildInputs = [
     aiohttp
     future-fstrings

pkgs/servers/mautrix-telegram/default.nix

@@ -1,4 +1,4 @@
-{ lib, python3, mautrix-telegram }:
+{ lib, python3, mautrix-telegram, fetchpatch }:
 
 with python3.pkgs;
 
@@ -11,6 +11,15 @@ buildPythonPackage rec {
     sha256 = "1lsi6x5yr8f9yjxsh1rmcd6wnxr6s6rpr720lg7sq629m42d9p1d";
   };
 
+  patches = [
+    (fetchpatch {
+      url = https://github.com/tulir/mautrix-telegram/commit/be6d395ed66d86ec7f13a262f9ae37731987019c.patch;
+      sha256 = "1q69ip17r45yhyrxr0pj8bvqj2grw2l39wak8pi5pm7qrxra93j2";
+    })
+  ];
+
+  disabled = pythonOlder "3.6";
+
   postPatch = ''
     sed -i -e '/alembic>/d' setup.py
   '';