nix-flake: Add documentation as flake output

Signed-off-by: Sarah Renkhoff <[email protected]>

doc.nix

@@ -0,0 +1,60 @@
+{ lib
+, stdenv
+, west2nixHook
+, pythonEnv
+, cmake
+, ninja
+, doxygen
+, mscgen
+, graphviz
+, git
+, zephyr
+, bridle
+}:
+
+stdenv.mkDerivation {
+
+  name = "bridle-doc";
+  src = bridle;
+  unpackPhase = ''
+    cp -r ${bridle} bridle
+    chmod +w -R bridle
+    cd bridle
+    git init
+    git config user.email "[email protected]"
+    git config user.name "Foo"
+    git checkout -b fake-branch
+    git add -A
+    git commit -m "Fake Commnit"
+    cd ..
+  '';
+
+  nativeBuildInputs = [
+    west2nixHook
+    pythonEnv
+    cmake
+    ninja
+    doxygen
+    mscgen
+    graphviz
+    git
+  ];
+
+  dontUseCmakeConfigure = true;
+
+  CMAKE_PREFIX_PATH = "/build/bridle/share/bridle-package:/build/zephyr/share/zephyr-package";
+
+  buildPhase = ''
+    cd /build
+    chmod +w -R ./*
+    west build --cmake-only -b none -d build bridle/doc
+    west build -t zephyr-doxygen -b none -d build
+    west build -t bridle-doxygen -b none -d build
+    west build -t build-all -b none -d build
+  '';
+
+  installPhase = ''
+    mkdir $out
+    cp -r build/html $out/
+  '';
+}

flake.nix

@@ -57,5 +57,7 @@
         packages.west2nix = inputs.west2nix.packages.${system}.default;
 
         devShells.default = callPackage ./shell.nix { };
+
+        packages.doc = callPackage ./doc.nix { };
       }));
 }