install

#!/usr/bin/env bash


# TODO: make this a package after packaging local-bin

esc=$(echo -en "\033")

clr="${esc}[0m"
bright="${esc}[1m"
dim="${esc}[2m"

red="${esc}[31m"
green="${esc}[32m"
cyan="${esc}[36m"
white="${esc}[37m"

info=" ${cyan}*${clr} "
error=" ${red}*${clr} "

function prompt {
    local inversed

    if [[ "$2" == "inverse" ]]; then
        inversed=true
    else
        inversed=false
    fi

    local questionAnswerVariants
    questionAnswerVariants=$($inversed && echo "[${red}y${clr}|${green}N${clr}]" || echo "[${green}Y${clr}|${red}n${clr}]")
    local ans=""
    while true; do
        echo -n "${white}${bright}>>> ${clr}${1}${clr} ${questionAnswerVariants} "
        read -n1 ans
        if [[ ! ( $ans =~ [yYnN] || $ans == "" ) ]]; then
            echo ""
            echo "Sorry didn't understand, try again."
        else
            if [[ $ans != "" ]]; then
                echo ""
            fi
            if [[ $ans =~ [yY] || ( $ans == "" && ! "$inversed" == "true" ) ]]; then
                answer=true
            else
                answer=false
            fi
            break
        fi
    done

    local returnCode
    if [[ "$answer" == "true" ]]; then
        returnCode=0
    else
        returnCode=1
    fi
    return $returnCode
}



thisDir="$(readlink -f "$(dirname "${0}")")"

attributeRef="${1}"

if type nixos-rebuild &>/dev/null; then
  if [[ n"${attributeRef}" == n ]]; then
    attributeRef="$(hostname)"
  fi

  echo "${info}Installing system-wide configuration (nixos)"
  echo "${info}Flake path: ${dim}path:${thisDir}${clr}"
  echo "${info}Flake attribute: ${dim}${attributeRef}${clr}"

  prompt "Proceed?" inverse

  echo "path:${thisDir}" | sudo tee /etc/nixos/flake-ref >/dev/null
  echo "${attributeRef}" | sudo tee /etc/nixos/host-ref >/dev/null

  nix run --impure "$(< /etc/nixos/flake-ref)#os-rebuild" -- boot
elif type nix &> /dev/null; then
  if [[ n"${attributeRef}" == n ]]; then
    attributeRef="$(whoami)"
  fi

  echo "${info}Installing user configuration (home-manager)"
  echo "${info}Flake path: ${dim}path:${thisDir}${clr}"
  echo "${info}Flake attribute: ${dim}${attributeRef}${clr}"

  prompt "Proceed?" inverse || exit 0

  mkdir -p ~/.config/hm &>/dev/null
  echo "path:${thisDir}" > ~/.config/hm/flake-ref
  echo "${attributeRef}" > ~/.config/hm/user-config-ref

  nix --extra-experimental-features 'nix-command flakes' run --impure "$(< ~/.config/hm/flake-ref)#home-rebuild" -- switch -b .hm-backup~ || exit 1
  prompt "Add system-wide xsession pointing to home?" || exit 0
  cat <<EOF | sudo tee /usr/bin/start-user-xsession > /dev/null
  #!/usr/bin/env bash
  exec \${HOME}/.xsession
EOF
  sudo chmod +x /usr/bin/start-user-xsession
  cat <<EOF | sudo tee /usr/share/xsessions/home-managed_x.desktop > /dev/null
  [Desktop Entry]
  Version=1.0
  Name=home-managed_x
  Comment=Passthrough to xsession script of in user home
  TryExec=start-user-xsession
  Exec=start-user-xsession
  Type=XSession
  DesktopNames=home-managed_x
EOF
else
  echo "${error}ERROR: No nix or nixos-rebuild found!" >&2;
  exit 1
fi