gistfile1.zsh

  #####################################################################

  # shell independent prompts #########################################

  #####################################################################

  # Read a single char from /dev/tty, prompting with "$*"

  # Note: pressing enter will return a null string. Perhaps a version terminated with X and then remove it in caller?

  # See https://unix.stackexchange.com/a/367880/143394 for dealing with multi-byte, etc.

  function get_keypress {

    local REPLY IFS=

    >/dev/tty printf '%s' "$*"

    [[ $ZSH_VERSION ]] && read -rk1  # Use -u0 to read from STDIN

    # See https://unix.stackexchange.com/q/383197/143394 regarding '\n' -> ''

    [[ $BASH_VERSION ]] && </dev/tty read -rn1

    printf '%s' "$REPLY"

  }

  # Get a y/n from the user, return yes=0, no=1 enter=$2

  # Prompt using $1.

  # If set, return $2 on pressing enter, useful for cancel or defualting

  function get_yes_keypress {

    local prompt="${1:-Are you sure [y/n]? }"

    local enter_return=$2

    local REPLY

    # [[ ! $prompt ]] && prompt="[y/n]? "

    while REPLY=$(get_keypress "$prompt"); do

      [[ $REPLY ]] && printf '\n' # $REPLY blank if user presses enter

      case "$REPLY" in

        Y|y)  return 0;;

        N|n)  return 1;;

        '')   [[ $enter_return ]] && return "$enter_return"

      esac

    done

  }

  # Credit: http://unix.stackexchange.com/a/14444/143394

  # Prompt to confirm, defaulting to NO on <enter>

  # Usage: confirm "Dangerous. Are you sure?" && rm *

  function confirm {

    local prompt=${*:-Are you sure} [y/N]? "

    get_yes_keypress "$prompt" 1

  }

  # Prompt to confirm, defaulting to YES on <enter>

  function confirm_yes {

    local prompt="${*:-Are you sure} [Y/n]? "

    get_yes_keypress "$prompt" 0

  }

  #####################################################################

  #####################################################################

  #####################################################################

alias  up='nixos-rebuild test --upgrade '

function upn {

  cd $NIXPKGS &&

  if [[ $(git status --porcelain ) == "" ]];

  then

    echo "checking out commit " $(nixos-version --hash) " under branch name " $(nixos-version | cut -d" " -f1)

    git fetch upstream && git checkout $(nixos-version --hash) -b $(nixos-version | cut -d" " -f1)

  else

    git status

  fi

}

alias gcn='cd $NIXPKGS && git checkout $(nixos-version | cut -d" " -f1)'

alias  te='nixos-rebuild test   -p rt -I nixos-config=/home/bart/nixosConfig/machines/$(hostname | cut -d"-" -f1)/rt.nix                     && nixos-rebuild test'

alias ten='nixos-rebuild test   -p rt -I nixos-config=/home/bart/nixosConfig/machines/$(hostname | cut -d"-" -f1)/rt.nix -I nixpkgs=$NIXPKGS && nixos-rebuild test   -I nixpkgs=$NIXPKGS'

alias  sw='nixos-rebuild boot -p rt -I nixos-config=/home/bart/nixosConfig/machines/$(hostname | cut -d"-" -f1)/rt.nix                     && nixos-rebuild switch'

alias swn='nixos-rebuild switch -p rt -I nixos-config=/home/bart/nixosConfig/machines/$(hostname | cut -d"-" -f1)/rt.nix -I nixpkgs=$NIXPKGS && nixos-rebuild switch -I nixpkgs=$NIXPKGS'

nga() {

  if confirm "Delete all generations and vacuum the systemd journal?"; then

    nix-collect-garbage -d && journalctl --vacuum-time=2d

  else

    echo "\nOK, we'll keep it all"

  fi

}

ngd() {

  if [[ -n "$1" ]] && [[ "$1" =~ ^-?[0-9]+$ ]]; then

    if confirm "Delete all generations and vacuum the systemd journal except for the last $1 days?"; then

      nix-collect-garbage --delete-older-than $1d && journalctl --vacuum-time=$1d

    else

      echo "\nOK, we'll keep it all."

    fi

  else

    echo "\nYou need to give the number of days you want to keep!"

  fi

}

lg() {

  echo "System generations\n"

  nix-env -p /nix/var/nix/profiles/system --list-generations

  echo "\n\nRT generations:\n"

  nix-env -p /nix/var/nix/profiles/system-profiles/rt --list-generations

}

dgs() {

  if [[ -n "$@" ]] && [[ "$@" =~ ^-?[0-9]+$ ]]; then

    nix-env -p /nix/var/nix/profiles/system --delete-generations $@

  else

    echo "\nYou need to tell me which generations to delete!"

  fi

}

dgr() {

  if [[ -n "$@" ]] && [[ "$@" =~ ^-?[0-9]+$ ]]; then

    nix-env -p /nix/var/nix/profiles/system-profiles/rt --delete-generations $@

  else

    echo "\nYou need to tell me which generations to delete!"

  fi

}

vi() {emacseditor --create-frame --quiet --no-wait "$@"}

# export EDITOR="vi"

# This function is called whenever a command is not found.

command_not_found_handler() {

  local p=/nix/store/ldz5024nnwj5q05iccp6wkfaiwbdccq3-command-not-found/bin/command-not-found

  if [ -x $p -a -f /nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite ]; then

    # Run the helper program.

    $p "$@"

    # Retry the command if we just installed it.

    if [ $? = 126 ]; then

      "$@"

    fi

  else

    # Indicate than there was an error so ZSH falls back to its default handler

    echo "$1: command not found" >&2

    return 127

  fi

}