add a nix package (with CI tests) for libghostty-vt (#12090)

.github/workflows/test.yml

@@ -653,6 +653,18 @@ jobs:
       - name: Check to see if the binary has not been stripped
         run: nm result/bin/.ghostty-wrapped 2>&1 | grep -q 'main_ghostty.main'
 
+      - name: Test ReleaseFast build of libghostty-vt
+        run: nix build .#libghostty-vt-releasefast
+
+      - name: Check to see if the library looks sane
+        run: nm result/lib/libghostty-vt.so.0.1.0 2>&1 | grep -q 'ghostty_terminal_new'
+
+      - name: Test Debug build of libghostty-vt
+        run: nix build .#libghostty-vt-debug
+
+      - name: Check to see if the library looks sane
+        run: nm result/lib/libghostty-vt.so.0.1.0 2>&1 | grep -q 'ghostty_terminal_new'
+
   build-dist:
     runs-on: namespace-profile-ghostty-sm
     needs: test

flake.nix

@@ -102,6 +102,12 @@
 
         ghostty = ghostty-releasefast;
         default = ghostty;
+
+        libghostty-vt-debug = pkgs.callPackage ./nix/libghostty-vt.nix (mkPkgArgs "Debug");
+        libghostty-vt-releasesafe = pkgs.callPackage ./nix/libghostty-vt.nix (mkPkgArgs "ReleaseSafe");
+        libghostty-vt-releasefast = pkgs.callPackage ./nix/libghostty-vt.nix (mkPkgArgs "ReleaseFast");
+
+        libghostty-vt = libghostty-vt-releasefast;
       });
 
     formatter = forAllPlatforms (pkgs: pkgs.alejandra);

nix/libghostty-vt.nix

@@ -0,0 +1,85 @@
+{
+  lib,
+  stdenv,
+  callPackage,
+  git,
+  pkg-config,
+  zig_0_15,
+  revision ? "dirty",
+  optimize ? "Debug",
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "ghostty";
+  version = "0.1.0-dev";
+
+  # We limit source like this to try and reduce the amount of rebuilds as possible
+  # thus we only provide the source that is needed for the build
+  #
+  # NOTE: as of the current moment only linux files are provided,
+  # since darwin support is not finished
+  src = lib.fileset.toSource {
+    root = ../.;
+    fileset = lib.fileset.intersection (lib.fileset.fromSource (lib.sources.cleanSource ../.)) (
+      lib.fileset.unions [
+        ../dist/linux
+        ../images
+        ../include
+        ../po
+        ../pkg
+        ../src
+        ../vendor
+        ../build.zig
+        ../build.zig.zon
+        ../build.zig.zon.nix
+      ]
+    );
+  };
+
+  deps = callPackage ../build.zig.zon.nix {name = "ghostty-cache-${finalAttrs.version}";};
+
+  nativeBuildInputs = [
+    git
+    pkg-config
+    zig_0_15
+  ];
+
+  buildInputs = [];
+
+  dontSetZigDefaultFlags = true;
+
+  zigBuildFlags = [
+    "--system"
+    "${finalAttrs.deps}"
+    "-Dversion-string=${finalAttrs.version}-${revision}-nix"
+    "-Dcpu=baseline"
+    "-Doptimize=${optimize}"
+    "-Dapp-runtime=none"
+    "-Demit-lib-vt=true"
+  ];
+
+  outputs = [
+    "out"
+    "dev"
+  ];
+
+  postInstall = ''
+    mkdir -p "$dev/lib"
+    mv "$out/lib/libghostty-vt.a" "$dev/lib"
+    rm "$out/lib/libghostty-vt.so"
+    mv "$out/include" "$dev"
+    mv "$out/share" "$dev"
+
+    ln -sf "$out/lib/libghostty-vt.so.0"  "$dev/lib/libghostty-vt.so"
+  '';
+
+  postFixup = ''
+    substituteInPlace "$dev/share/pkgconfig/libghostty-vt.pc" \
+      --replace "$out" "$dev"
+  '';
+
+  meta = {
+    homepage = "https://ghostty.org";
+    license = lib.licenses.mit;
+    platforms = zig_0_15.meta.platforms;
+  };
+})