{ lib, stdenv, fetchFromGitLab }:

let
  # These settings are found in the Makefile, but there seems to be no
  # way to select one or the other setting other than editing the file
  # manually, so we have to duplicate the know how here.
  systemFlags = lib.optionalString stdenv.isDarwin ''
    CFLAGS="-O2 -Wall -fomit-frame-pointer -no-cpp-precomp"
    LDFLAGS=
  '' + lib.optionalString stdenv.isCygwin ''
    CFLAGS="-O2 -Wall -fomit-frame-pointer"
    LDFLAGS=-s
    TREE_DEST=tree.exe
  '' + lib.optionalString (stdenv.isFreeBSD || stdenv.isOpenBSD) ''
    CFLAGS="-O2 -Wall -fomit-frame-pointer"
    LDFLAGS=-s
  ''; # use linux flags by default
in
stdenv.mkDerivation rec {
  pname = "tree";
  version = "2.1.1";

  src = fetchFromGitLab {
    owner = "OldManProgrammer";
    repo = "unix-tree";
    rev = version;
    sha256 = "sha256-aPz1ROUeAKDmMjEtAaL2AguF54/CbIYWpL4Qovv2ftQ=";
  };

  preConfigure = ''
    makeFlagsArray+=(${systemFlags})
  '';

  makeFlags = [
    "CC=${stdenv.cc.targetPrefix}cc"
    "PREFIX=${placeholder "out"}"
  ];

  meta = with lib; {
    homepage = "https://oldmanprogrammer.net/source.php?dir=projects/tree";
    description = "Command to produce a depth indented directory listing";
    license = licenses.gpl2Plus;
    longDescription = ''
      Tree is a recursive directory listing command that produces a
      depth indented listing of files, which is colorized ala dircolors if
      the LS_COLORS environment variable is set and output is to tty.
    '';
    platforms = platforms.all;
    maintainers = with maintainers; [ nickcao ];
    mainProgram = "tree";
  };
}