blightmud: init at 3.5.0

Blightmud is a terminal client for connecting to Multi User Dungeon
(MUD) games. It is written in Rust and supports TLS, GMCP, MSDP, MCCP2,
tab completion, text searching and a split view for scrolling. Blightmud
can be customized with Lua scripting for aliases, triggers, timers,
customized status bars, and more. Blightmud supports several
accessibility features including an optional built-in text-to-speech
engine and a screen reader friendly mode.

For nixpkgs it is largely a standard derivation for a rust project using
`rustPlatform.buildRustPackage`. There is some customization required
for the optional text-to-speech (TTS) engine support. In this case the
derivation must also set the `LIBCLANG_PATH` and customize
`BINDGEN_EXTRA_CLANG_ARGS` in order for a required crate to be able to
`rust-bindgen` the `libspeechd` dependency it wraps. Lastly the
derivation has to skip some integration-style tests that don't play
nicely with the nixpkgs build environment - the majority of unit tests
work so they are left running in the check phase.

Since the TTS support brings in heavy dependencies, but is a useful
accessibility feature, the Blightmud derivation is added to
`all-packages.nix` twice:

1. the `blightmud` attribute builds a configuration without TTS support.
2. the `blightmud-tts` attribute builds a configuration _with_ TTS
   support.

The new Blightmud derivation is placed in `pkgs/games/blightmud/`
following the precedent set by another packaged GUI-based MUD client,
`mudlet` with `pkgs/games/mudlet/`.

pkgs/games/blightmud/default.nix

@@ -0,0 +1,79 @@
+{ stdenv, lib, fetchFromGitHub, rustPlatform, pkg-config, alsa-lib, openssl
+, withTTS ? false, llvmPackages, speechd }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "blightmud";
+  version = "3.5.0";
+
+  src = fetchFromGitHub {
+    owner = pname;
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-DaICzwBew90YstV42wiY0IbvR1W4Hm8dzo3xY2qlMGQ=";
+  };
+
+  cargoSha256 = "sha256-BamMTPh+GN9GG4puxyTauPhjCC8heCu1wsgFaw98s9U=";
+
+  buildFeatures = lib.optional withTTS "tts";
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ alsa-lib openssl ] ++ lib.optional withTTS [ speechd ];
+
+  # Building the speech-dispatcher-sys crate for TTS support requires setting
+  # LIBCLANG_PATH.
+  LIBCLANG_PATH = lib.optionalString withTTS "${llvmPackages.libclang.lib}/lib";
+
+  preBuild = lib.optionalString withTTS ''
+    # When building w/ TTS the speech-dispatcher-sys crate's build.rs uses
+    # rust-bindgen with libspeechd. This bypasses the normal nixpkgs CC wrapper
+    # so we have to adapt the BINDGEN_EXTRA_CLANG_ARGS env var to compensate. See
+    # this blog post[0] for more information.
+    #
+    # [0]: https://hoverbear.org/blog/rust-bindgen-in-nix/
+
+    export BINDGEN_EXTRA_CLANG_ARGS="$(< ${stdenv.cc}/nix-support/libc-cflags) \
+      $(< ${stdenv.cc}/nix-support/cc-cflags) \
+      -isystem ${llvmPackages.libclang.lib}/lib/clang/${
+        lib.getVersion llvmPackages.clang
+      }/include \
+      -idirafter ${stdenv.cc.cc}/lib/gcc/${stdenv.hostPlatform.config}/${
+        lib.getVersion stdenv.cc.cc
+      }/include \
+      -idirafter ${speechd}/include"
+  '';
+
+  checkFlags = let
+    # Most of Blightmud's unit tests pass without trouble in the isolated
+    # Nixpkgs build env. The following tests need to be skipped.
+    skipList = [
+      "test_connect"
+      "test_gmcp_negotiation"
+      "test_ttype_negotiation"
+      "test_reconnect"
+      "test_mud"
+      "test_server"
+      "test_lua_script"
+      "timer_test"
+      "validate_assertion_fail"
+    ];
+    skipFlag = test: "--skip " + test;
+  in builtins.concatStringsSep " " (builtins.map skipFlag skipList);
+
+  meta = with lib; {
+    description = "A terminal MUD client written in Rust";
+    longDescription = ''
+      Blightmud is a terminal client for connecting to Multi User Dungeon (MUD)
+      games. It is written in Rust and supports TLS, GMCP, MSDP, MCCP2, tab
+      completion, text searching and a split view for scrolling. Blightmud can
+      be customized with Lua scripting for aliases, triggers, timers, customized
+      status bars, and more. Blightmud supports several accessibility features
+      including an optional built-in text-to-speech engine and a screen reader
+      friendly mode.
+    '';
+    homepage = "https://github.com/Blightmud/Blightmud";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ cpu ];
+    platforms = platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -30716,6 +30716,10 @@ with pkgs;
     lua = lua5_1;
   };
 
+  blightmud = callPackage ../games/blightmud { };
+
+  blightmud-tts = callPackage ../games/blightmud { withTTS = true; };
+
   n2048 = callPackage ../games/n2048 { };
 
   naev = callPackage ../games/naev { };