Produce GitHub actions artifacts

.github/workflows/build.yml

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+name: 'nix-remarkable'
+on:
+  pull_request:
+  push:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/[email protected]
+    - uses: cachix/install-nix-action@v11
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+    - run: nix build
+    - name: "Copy ti84-forth"
+      run: "mkdir ti84-forth && cp -r result/* ti84-forth && chmod +w -R ti84-forth"
+    - name: "Upload artifact to github"
+      uses: actions/upload-artifact@v2
+      with:
+        name: ti84-forth
+        path: ti84-forth

default.nix

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+{ pkgs ? import <nixpkgs> {}}:
+with pkgs;
+
+let
+  spasm-ng = callPackage ./spasm-ng.nix {};
+in
+
+stdenv.mkDerivation {
+  name = "ti84-forth";
+  src = ./.;
+  nativeBuildInputs = [ spasm-ng ];
+
+  buildPhase = ''
+    spasm forth.asm forth.8xp
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    mv forth.8xp $out/bin
+  '';
+}

spasm-ng.nix

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+{ stdenv, fetchFromGitHub, gcc, gmp, openssl, zlib }:
+
+stdenv.mkDerivation rec {
+  pname = "spasm-ng";
+  version = "unstable-2020-08-03";
+
+  src = fetchFromGitHub {
+    owner = "alberthdev";
+    repo = "spasm-ng";
+    rev = "221898beff2442f459b80ab89c8e1035db97868e";
+    sha256 = "0xspxmp2fir604b4xsk4hi1gjv61rnq2ypppr7cj981jlhicmvjj";
+  };
+
+  nativeBuildInputs = [ gcc ];
+
+  buildInputs = [ gmp openssl zlib ];
+
+  enableParallelBuilding = true;
+
+  hardeningDisable = [ "fortify" ];
+
+  installPhase = ''
+    install -Dm755 spasm -t $out/bin
+  '';
+}