oil: init at 0.20.0

This is the new C++ version

Co-authored-by: Szymon Scholz <raspher@protonmail.com>

pkgs/by-name/oi/oil/package.nix

@@ -0,0 +1,74 @@
+{ stdenv, lib, fetchurl, symlinkJoin, withReadline ? true, readline }:
+
+let
+  readline-all = symlinkJoin {
+    name = "readline-all"; paths = [ readline readline.dev ];
+  };
+in
+stdenv.mkDerivation rec {
+  pname = "oil";
+  version = "0.20.0";
+
+  src = fetchurl {
+    url = "https://www.oilshell.org/download/oils-for-unix-${version}.tar.gz";
+    hash = "sha256-d4BIRj8bPyd7awZyJPlZYBwr+o82IKGh4y4/urOYOxc=";
+  };
+
+  postPatch = ''
+    patchShebangs _build
+  '';
+
+  preInstall = ''
+    mkdir -p $out/bin
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+
+    _build/oils.sh
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    ./install
+
+    runHook postInstall
+  '';
+
+  strictDeps = true;
+  buildInputs = lib.optional withReadline readline;
+  # As of 0.19.0 the build generates an error on MacOS (using clang version 16.0.6 in the builder),
+  # whereas running it outside of Nix with clang version 15.0.0 generates just a warning. The shell seems to
+  # work just fine though, so we disable the error here.
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-error=incompatible-function-pointer-types";
+  configureFlags = [
+    "--datarootdir=${placeholder "out"}"
+  ] ++ lib.optionals withReadline [
+    "--with-readline"
+    "--readline=${readline-all}"
+  ];
+
+  # Stripping breaks the bundles by removing the zip file from the end.
+  dontStrip = true;
+
+  meta = {
+    description = "A new unix shell";
+    homepage = "https://www.oilshell.org/";
+
+    license = with lib.licenses; [
+      psfl # Includes a portion of the python interpreter and standard library
+      asl20 # Licence for Oil itself
+    ];
+
+    platforms = lib.platforms.all;
+    maintainers = with lib.maintainers; [ lheckemann alva ];
+    changelog = "https://www.oilshell.org/release/${version}/changelog.html";
+  };
+
+  passthru = {
+    shellPath = "/bin/osh";
+  };
+}