{ lib, stdenv, fetchurl }:

let
  # These settings are found in the Makefile, but there seems to be no
  # way to select one ore 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"
    LDFLAGS=
    EXTRA_OBJS=strverscmp.o
  '' + lib.optionalString stdenv.isCygwin ''
    CFLAGS="-O2 -Wall -fomit-frame-pointer -DCYGWIN"
    LDFLAGS=-s
    TREE_DEST=tree.exe
    EXTRA_OBJS=strverscmp.o
  '' + lib.optionalString (stdenv.isFreeBSD || stdenv.isOpenBSD) ''
    CFLAGS="-O2 -Wall -fomit-frame-pointer"
    LDFLAGS=-s
    EXTRA_OBJS=strverscmp.o
  ''; # use linux flags by default
in
stdenv.mkDerivation rec {
  pname = "tree";
  version = "1.8.0";

  src = fetchurl {
    url = "http://mama.indstate.edu/users/ice/tree/src/tree-${version}.tgz";
    sha256 = "1hmpz6k0mr6salv0nprvm1g0rdjva1kx03bdf1scw8a38d5mspbi";
  };

  preConfigure = ''
    sed -i Makefile -e 's|^OBJS=|OBJS=$(EXTRA_OBJS) |'
    makeFlagsArray+=(
      ${systemFlags}
      "CC=$CC"
    )
  '';

  makeFlags = [
    "prefix=${placeholder "out"}"
    "MANDIR=${placeholder "out"}/share/man/man1"
  ];

  meta = with lib; {
    homepage = "http://mama.indstate.edu/users/ice/tree/";
    description = "Command to produce a depth indented directory listing";
    license = licenses.gpl2;
    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; [ SuperSandro2000 ];
  };
}