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{ fetchurl, lib, stdenv, pkg-config, makeWrapper, meson, ninja, installShellFiles, libxcb, xcbutilkeysyms
, xcbutil, xcbutilwm, xcbutilxrm, libstartup_notification, libX11, pcre2, libev
, yajl, xcb-util-cursor, perl, pango, perlPackages, libxkbcommon
, xorgserver, xvfb-run, xdotool, xorg, which
, asciidoc, xmlto, docbook_xml_dtd_45, docbook_xsl, findXMLCatalogs
, nixosTests
}:

stdenv.mkDerivation rec {
  pname = "i3";
  version = "4.23";

  src = fetchurl {
    url = "https://i3wm.org/downloads/${pname}-${version}.tar.xz";
    sha256 = "sha256-YQJqcZbJE50POq3ScZfosyDFduOkUOAddMGspIQETEY=";
  };

  nativeBuildInputs = [
    pkg-config makeWrapper meson ninja installShellFiles perl
    asciidoc xmlto docbook_xml_dtd_45 docbook_xsl findXMLCatalogs
  ];

  mesonFlags = [
    "-Ddocs=true"
    "-Dmans=true"
  ];

  buildInputs = [
    libxcb xcbutilkeysyms xcbutil xcbutilwm xcbutilxrm libxkbcommon
    libstartup_notification libX11 pcre2 libev yajl xcb-util-cursor perl pango
    perlPackages.AnyEventI3 perlPackages.X11XCB perlPackages.IPCRun
    perlPackages.ExtUtilsPkgConfig perlPackages.InlineC
  ] ++ lib.optionals doCheck [
    xorgserver xvfb-run xdotool xorg.setxkbmap xorg.xrandr which
  ];

  configureFlags = [ "--disable-builddir" ];

  postPatch = ''
    patchShebangs .

    # This testcase generates a Perl executable file with a shebang, and
    # patchShebangs can't replace a shebang in the middle of a file.
    if [ -f testcases/t/318-i3-dmenu-desktop.t ]; then
      substituteInPlace testcases/t/318-i3-dmenu-desktop.t \
        --replace-fail "#!/usr/bin/env perl" "#!${perl}/bin/perl"
    fi
  '';

  # xvfb-run is available only on Linux
  doCheck = stdenv.isLinux;

  checkPhase = ''
    test_failed=
    # "| cat" disables fancy progress reporting which makes the log unreadable.
    ./complete-run.pl -p 1 --keep-xserver-output | cat || test_failed="complete-run.pl returned $?"
    if [ -z "$test_failed" ]; then
      # Apparently some old versions of `complete-run.pl` did not return a
      # proper exit code, so check the log for signs of errors too.
      grep -q '^not ok' latest/complete-run.log && test_failed="test log contains errors" ||:
    fi
    if [ -n "$test_failed" ]; then
      echo "***** Error: $test_failed"
      echo "===== Test log ====="
      cat latest/complete-run.log
      echo "===== End of test log ====="
      false
    fi
  '';

  postInstall = ''
    wrapProgram "$out/bin/i3-save-tree" --prefix PERL5LIB ":" "$PERL5LIB"
    for program in $out/bin/i3-sensible-*; do
      sed -i 's/which/command -v/' $program
    done

    installManPage man/*.1
  '';

  separateDebugInfo = true;

  passthru.tests = { inherit (nixosTests) i3wm; };


  meta = with lib; {
    description = "Tiling window manager";
    homepage    = "https://i3wm.org";
    maintainers = with maintainers; [ modulistic fpletz ];
    mainProgram = "i3";
    license     = licenses.bsd3;
    platforms   = platforms.all;

    longDescription = ''
      A tiling window manager primarily targeted at advanced users and
      developers. Based on a tree as data structure, supports tiling,
      stacking, and tabbing layouts, handled dynamically, as well as
      floating windows. Configured via plain text file. Multi-monitor.
      UTF-8 clean.
    '';
  };

}