matterhorn: 50200.19.0 -> unstable-2024-01-11

haskellPackages.mattermost-api: 50200.19.0 -> unstable-2024-01-11

Unfortunately, it is a bit of a nightmare to get matterhorn to work with
Stackage LTS 22 without picking so much from its development branch that
it can no longer be called patching…

Luckily this is relatively unproblematic, also in the case of
mattermost-api, since the packages form a unit that nothing else really
depends on. There is a regression in matterhorn regarding stty handling
compared to the stable release, though:
https://github.com/matterhorn-chat/matterhorn/commit/2ede0d6f714ba408587bf265c4b418b21b0d051f

pkgs/development/haskell-modules/configuration-common.nix

@@ -533,11 +533,49 @@ self: super: {
   # 2023-04-20: Restrictive bytestring bound in tests.
   storablevector = doJailbreak super.storablevector;
 
-  # 2023-04-20: Pretends to need brick 1.6 but the commit history here
-  # https://github.com/matterhorn-chat/matterhorn/commits/master/matterhorn.cabal
-  # makes very clear that 1.4 is equally fine.
-  # Generally a slightly packaging hostile bound practice.
-  matterhorn = doJailbreak super.matterhorn;
+  # Need following changes from develop branch:
+  # - crypton-connection over connection (abandoned)
+  # - vty >= 6 (& pals) support
+  # Unreasonably difficult to apply as patches
+  matterhorn = lib.pipe
+    (super.matterhorn.override {
+        connection = self.crypton-connection;
+    })
+    [
+      doJailbreak
+      # vty >= 6 support
+      (addBuildDepends [ self.vty-crossplatform ])
+      (overrideSrc {
+        version = "unstable-2024-01-11";
+        src = pkgs.fetchFromGitHub {
+          owner = "matterhorn-chat";
+          repo = "matterhorn";
+          rev = lib.warnIf
+            (super.matterhorn.version != "50200.19.0")
+            "matterhorn on Hackage may have caught up with our pinned commit"
+            "66d23291a1c748e568908b91b1109ed17b6d86e9";
+          sha256 = "0djawpp0zvvc2v020k6p4chvd1dlmcs0fa3d4wlr0cmkha40flpb";
+        };
+      })
+    ];
+  # Switch to crypton-connection over abandoned connection
+  # To add insult to injury, mattermost-api had a breaking change on its develop
+  # branch, so we also need to bump it to an unstable commit. Luckily, matterhorn
+  # is its only consumer on Hackage.
+  mattermost-api = overrideSrc {
+    version = lib.warnIf
+      (super.mattermost-api.version != "50200.15.0")
+      "mattermost-api on Hackage may have caught up with our pinned commit"
+      "unstable-2024-01-11";
+    src = pkgs.fetchFromGitHub {
+      owner = "matterhorn-chat";
+      repo = "mattermost-api";
+      rev = "8df809df4d96930cf8b39d0d8f54cdb6d8f42b59";
+      sha256 = "154p4yi941l9ga2c3vw8yhgq0g1wn4jhmg3yhzgwgca1c5d1vydi";
+    };
+  } (super.mattermost-api.override {
+    connection = self.crypton-connection;
+  });
 
   # Too strict bounds on transformers and resourcet
   # https://github.com/alphaHeavy/lzma-conduit/issues/23