<commit_before>{ config, lib, pkgs, ... }:

with lib;

let

  xcfg = config.services.xserver;
  cfg = xcfg.desktopManager.plasma5;

  inherit (pkgs) kdeApplications plasma5 libsForQt5 qt5;
  inherit (pkgs) writeText;

  pulseaudio = config.hardware.pulseaudio;
  pactl = "${getBin pulseaudio.package}/bin/pactl";
  startplasma-x11 = "${getBin plasma5.plasma-workspace}/bin/startplasma-x11";
  sed = "${getBin pkgs.gnused}/bin/sed";

  gtkrc2 = writeText "gtkrc-2.0" ''
    # Default GTK+ 2 config for NixOS Plasma 5
    include "/run/current-system/sw/share/themes/Breeze/gtk-2.0/gtkrc"
    style "user-font"
    {
      font_name="Sans Serif Regular"
    }
    widget_class "*" style "user-font"
    gtk-font-name="Sans Serif Regular 10"
    gtk-theme-name="Breeze"
    gtk-icon-theme-name="breeze"
    gtk-fallback-icon-theme="hicolor"
    gtk-cursor-theme-name="breeze_cursors"
    gtk-toolbar-style=GTK_TOOLBAR_ICONS
    gtk-menu-images=1
    gtk-button-images=1
  '';

  gtk3_settings = writeText "settings.ini" ''
    [Settings]
    gtk-font-name=Sans Serif Regular 10
    gtk-theme-name=Breeze
    gtk-icon-theme-name=breeze
    gtk-fallback-icon-theme=hicolor
    gtk-cursor-theme-name=breeze_cursors
    gtk-toolbar-style=GTK_TOOLBAR_ICONS
    gtk-menu-images=1
    gtk-button-images=1
  '';

  kcminputrc = writeText "kcminputrc" ''
    [Mouse]
    cursorTheme=breeze_cursors
    cursorSize=0
  '';

  activationScript = ''
    # The KDE icon cache is supposed to update itself automatically, but it uses
    # the timestamp on the icon theme directory as a trigger. This doesn't work
    # on NixOS because the timestamp never changes. As a workaround, delete the
    # icon cache at login and session activation.
    # See also: http://lists-archives.org/kde-devel/26175-what-when-will-icon-cache-refresh.html
    rm -fv $HOME/.cache/icon-cache.kcache

    # xdg-desktop-settings generates this empty file but
    # it makes kbuildsyscoca5 fail silently. To fix this
    # remove that menu if it exists.
    rm -fv ''${XDG_CONFIG_HOME:?}/menus/applications-merged/xdg-desktop-menu-dummy.menu

    # Qt writes a weird ‘libraryPath’ line to
    # ~/.config/Trolltech.conf that causes the KDE plugin
    # paths of previous KDE invocations to be searched.
    # Obviously using mismatching KDE libraries is potentially
    # disastrous, so here we nuke references to the Nix store
    # in Trolltech.conf.  A better solution would be to stop
    # Qt from doing this wackiness in the first place.
    trolltech_conf="''${XDG_CONFIG_HOME:?}/Trolltech.conf"
    if [ -e "$trolltech_conf" ]; then
        ${sed} -i "$trolltech_conf" -e '/nix\\store\|nix\/store/ d'
    fi

    # Remove the kbuildsyscoca5 cache. It will be regenerated
    # immediately after. This is necessary for kbuildsyscoca5 to
    # recognize that software that has been removed.
    rm -fv $HOME/.cache/ksycoca*

    ${pkgs.libsForQt5.kservice}/bin/kbuildsycoca5
  '';

  startplasma =
    ''
      export XDG_CONFIG_HOME="''${XDG_CONFIG_HOME:-$HOME/.config}"
      mkdir -p "''${XDG_CONFIG_HOME:?}"

    ''
    + optionalString pulseaudio.enable ''
      # Load PulseAudio module for routing support.
      # See also: http://colin.guthr.ie/2009/10/so-how-does-the-kde-pulseaudio-support-work-anyway/
        ${pactl} load-module module-device-manager "do_routing=1"

    ''
    + ''
      ${activationScript}

      # Create default configurations if Plasma has never been started.
      kdeglobals="''${XDG_CONFIG_HOME:?}/kdeglobals"
      if ! [ -f "$kdeglobals" ]
      then
          kcminputrc="''${XDG_CONFIG_HOME:?}/kcminputrc"
          if ! [ -f "$kcminputrc" ]
          then
              cat ${kcminputrc} >"$kcminputrc"
          fi

          gtkrc2="$HOME/.gtkrc-2.0"
          if ! [ -f "$gtkrc2" ]
          then
              cat ${gtkrc2} >"$gtkrc2"
          fi

          gtk3_settings="''${XDG_CONFIG_HOME:?}/gtk-3.0/settings.ini"
          if ! [ -f "$gtk3_settings" ]
          then
              mkdir -p "$(dirname "$gtk3_settings")"
              cat ${gtk3_settings} >"$gtk3_settings"
          fi
      fi

    ''
    + ''
      exec "${startplasma-x11}"
    '';

in

{
  options = {

    services.xserver.desktopManager.plasma5 = {
      enable = mkOption {
        type = types.bool;
        default = false;
        description = "Enable the Plasma 5 (KDE 5) desktop environment.";
      };<commit_msg>nixos/plasma5: Fix activation script when XDG_CONFIG_HOME is unset<commit_after>{ config, lib, pkgs, ... }:

with lib;

let

  xcfg = config.services.xserver;
  cfg = xcfg.desktopManager.plasma5;

  inherit (pkgs) kdeApplications plasma5 libsForQt5 qt5;
  inherit (pkgs) writeText;

  pulseaudio = config.hardware.pulseaudio;
  pactl = "${getBin pulseaudio.package}/bin/pactl";
  startplasma-x11 = "${getBin plasma5.plasma-workspace}/bin/startplasma-x11";
  sed = "${getBin pkgs.gnused}/bin/sed";

  gtkrc2 = writeText "gtkrc-2.0" ''
    # Default GTK+ 2 config for NixOS Plasma 5
    include "/run/current-system/sw/share/themes/Breeze/gtk-2.0/gtkrc"
    style "user-font"
    {
      font_name="Sans Serif Regular"
    }
    widget_class "*" style "user-font"
    gtk-font-name="Sans Serif Regular 10"
    gtk-theme-name="Breeze"
    gtk-icon-theme-name="breeze"
    gtk-fallback-icon-theme="hicolor"
    gtk-cursor-theme-name="breeze_cursors"
    gtk-toolbar-style=GTK_TOOLBAR_ICONS
    gtk-menu-images=1
    gtk-button-images=1
  '';

  gtk3_settings = writeText "settings.ini" ''
    [Settings]
    gtk-font-name=Sans Serif Regular 10
    gtk-theme-name=Breeze
    gtk-icon-theme-name=breeze
    gtk-fallback-icon-theme=hicolor
    gtk-cursor-theme-name=breeze_cursors
    gtk-toolbar-style=GTK_TOOLBAR_ICONS
    gtk-menu-images=1
    gtk-button-images=1
  '';

  kcminputrc = writeText "kcminputrc" ''
    [Mouse]
    cursorTheme=breeze_cursors
    cursorSize=0
  '';

  activationScript = ''
    ${set_XDG_CONFIG_HOME}

    # The KDE icon cache is supposed to update itself automatically, but it uses
    # the timestamp on the icon theme directory as a trigger. This doesn't work
    # on NixOS because the timestamp never changes. As a workaround, delete the
    # icon cache at login and session activation.
    # See also: http://lists-archives.org/kde-devel/26175-what-when-will-icon-cache-refresh.html
    rm -fv $HOME/.cache/icon-cache.kcache

    # xdg-desktop-settings generates this empty file but
    # it makes kbuildsyscoca5 fail silently. To fix this
    # remove that menu if it exists.
    rm -fv ''${XDG_CONFIG_HOME}/menus/applications-merged/xdg-desktop-menu-dummy.menu

    # Qt writes a weird ‘libraryPath’ line to
    # ~/.config/Trolltech.conf that causes the KDE plugin
    # paths of previous KDE invocations to be searched.
    # Obviously using mismatching KDE libraries is potentially
    # disastrous, so here we nuke references to the Nix store
    # in Trolltech.conf.  A better solution would be to stop
    # Qt from doing this wackiness in the first place.
    trolltech_conf="''${XDG_CONFIG_HOME}/Trolltech.conf"
    if [ -e "$trolltech_conf" ]; then
        ${sed} -i "$trolltech_conf" -e '/nix\\store\|nix\/store/ d'
    fi

    # Remove the kbuildsyscoca5 cache. It will be regenerated
    # immediately after. This is necessary for kbuildsyscoca5 to
    # recognize that software that has been removed.
    rm -fv $HOME/.cache/ksycoca*

    ${pkgs.libsForQt5.kservice}/bin/kbuildsycoca5
  '';

  set_XDG_CONFIG_HOME = ''
      # Set the default XDG_CONFIG_HOME if it is unset.
      # Per the XDG Base Directory Specification:
      # https://specifications.freedesktop.org/basedir-spec/latest
      # 1. Never export this variable! If it is unset, then child processes are
      # expected to set the default themselves.
      # 2. Contaminate / if $HOME is unset; do not check if $HOME is set.
      XDG_CONFIG_HOME=''${XDG_CONFIG_HOME:-$HOME/.config}
  '';

  startplasma =
    ''
      ${set_XDG_CONFIG_HOME}
      mkdir -p "''${XDG_CONFIG_HOME}"

    ''
    + optionalString pulseaudio.enable ''
      # Load PulseAudio module for routing support.
      # See also: http://colin.guthr.ie/2009/10/so-how-does-the-kde-pulseaudio-support-work-anyway/
        ${pactl} load-module module-device-manager "do_routing=1"

    ''
    + ''
      ${activationScript}

      # Create default configurations if Plasma has never been started.
      kdeglobals="''${XDG_CONFIG_HOME}/kdeglobals"
      if ! [ -f "$kdeglobals" ]
      then
          kcminputrc="''${XDG_CONFIG_HOME}/kcminputrc"
          if ! [ -f "$kcminputrc" ]
          then
              cat ${kcminputrc} >"$kcminputrc"
          fi

          gtkrc2="$HOME/.gtkrc-2.0"
          if ! [ -f "$gtkrc2" ]
          then
              cat ${gtkrc2} >"$gtkrc2"
          fi

          gtk3_settings="''${XDG_CONFIG_HOME}/gtk-3.0/settings.ini"
          if ! [ -f "$gtk3_settings" ]
          then
              mkdir -p "$(dirname "$gtk3_settings")"
              cat ${gtk3_settings} >"$gtk3_settings"
          fi
      fi

    ''
    + ''
      exec "${startplasma-x11}"
    '';

in

{
  options = {

    services.xserver.desktopManager.plasma5 = {
      enable = mkOption {
        type = types.bool;
        default = false;
        description = "Enable the Plasma 5 (KDE 5) desktop environment.";
      };
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