{ ... }:
{
  programs.zsh.initExtra = ''
    if [ -f $HOME/.nix-profile/etc/profile.d/nix.sh ];
    then
      source $HOME/.nix-profile/etc/profile.d/nix.sh
    fi

    function sc-log {
      ssh smartcan "SYSTEMD_COLORS=true journalctl --follow --no-tail --unit smartcan-''${1:-*}"
    }

    function sc-restart {
      ssh smartcan "systemctl restart smartcan-''${1}"
    }

    function fu-build {
      ./kas-container build kas/kas-ttc-image-horsch.yml
    }

    function fu-build-dev {
      ./kas-container build kas/kas-ttc-image-horsch-dev.yml
    }

    function fu-reboot {
      ssh fusion "reboot"
    }

    function fu-swu {
      local ssh_login="fusion"
      local update_file=''${1}

      if [ -z ''${update_file} ]; then
          update_file=$(find build/tmp/deploy/images -name "*.swu" -type f | fzf --select-1)
      fi

      if [ -z ''${update_file} ]; then
          echo "no file selected"
          return 1
      fi

      if [ ! -f ''${update_file} ]; then
          echo "file \"''${update_file}\" does not exist"
          return 2
      fi

      echo "flashing ''${update_file} to device..."
      cat "''${update_file}" | ssh ''${ssh_login} "swupdate-client -"

      if [ $? -ne 0 ]; then
          echo "update failed"
          return 3
      fi

      echo "rebooting device"
      ssh ''${ssh_login} reboot

      echo "done."
    }

    function fu-wic {
      local fzf_preview='stat --printf "%n\nSize: %s bytes\nModified: %y" {}'

      uuu.exe -lsusb | grep --silent MX8QM
      if [ ''$? -eq 0 ]; then
        echo "fusion found"
      else
        echo "fusion not connected"
        return 1
      fi

      local bootloader_file=''${1}
      local wic_file=''${2}

      if [ -z ''${bootloader_file} ]; then
          bootloader_file=$(find build/tmp/deploy/images -name "imx-boot-horsch-fusion-sd*" -type f \
            | fzf --select-1 --exit-0 --header "Select a bootloader file" --preview=''${fzf_preview} --preview-window=top)
      fi

      if [ -z ''${bootloader_file} ]; then
          echo "no bootloader file selected"
          return 1
      fi

      if [ -z ''${wic_file} ]; then
          wic_file=$(find build/tmp/deploy/images -name "*.wic" -type f \
            | fzf --select-1 --exit-0 --header="Select a wic image file" --preview=''${fzf_preview} --preview-window=top)
      fi

      if [ -z ''${wic_file} ]; then
          echo "no wic file selected"
          return 1
      fi

      echo "flashing ''${wic_file} to device..."
      uuu.exe -v -b emmc_all ''${bootloader_file} ''${wic_file}

      echo "done."
    }
  '';
}