{ depot, pkgs, ... }:

let
  inherit (depot.nix.writers)
    rustSimple
    rustSimpleLib
    rustSimpleBin
    ;

  inherit (pkgs)
    coreutils
    ;

  run = drv: depot.nix.runExecline.local "run-${drv.name}" { } [
    "if"
    [ drv ]
    "importas"
    "out"
    "out"
    "${coreutils}/bin/touch"
    "$out"
  ];

  rustTransitiveLib = rustSimpleLib
    {
      name = "transitive";
    } ''
    pub fn transitive(s: &str) -> String {
      let mut new = s.to_string();
      new.push_str(" 1 2 3");
      new
    }

    #[cfg(test)]
    mod tests {
      use super::*;

      #[test]
      fn test_transitive() {
        assert_eq!(transitive("foo").as_str(), "foo 1 2 3")
      }
    }
  '';

  rustTestLib = rustSimpleLib
    {
      name = "test_lib";
      dependencies = [ rustTransitiveLib ];
    } ''
    extern crate transitive;
    use transitive::{transitive};
    pub fn test() -> String {
      transitive("test")
    }
  '';

  rustWithLib = run (rustSimple
    {
      name = "rust-with-lib";
      dependencies = [ rustTestLib ];
    } ''
    extern crate test_lib;

    fn main() {
      assert_eq!(test_lib::test(), String::from("test 1 2 3"));
    }
  '');


in
depot.nix.readTree.drvTargets {
  inherit
    rustTransitiveLib
    rustWithLib
    ;
}
