wm-workspace-get-next-empty

#!/usr/bin/env bash

# SCRIPT_DIR is set to the directory where this script is localed. It it was
# run by a symlink, it will be resolved to the directory of the target script
# (that is, the actual script directory).
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
if [[ -L "${BASH_SOURCE[0]}" ]]; then
    SCRIPT_DIR="$(readlink "${BASH_SOURCE[0]}")"
    SCRIPT_DIR="$( cd "$( dirname "${SCRIPT_DIR}" )" >/dev/null 2>&1 && pwd )"
fi

# get platform info, populates 'platform' and 'apple_silicon' variables
source "${SCRIPT_DIR}"/lib/platform.sh

# wm-workspace-get-next-empty
#  - Print number of the first empty workspace to the right of the current one
#    (or the current workspace if it is empty).

shopt -s xpg_echo

bold="\033[1m"
green="\033[32m"
reset="\033[0m"

# print usage message on -h/--help
if [[ "$1" == "-h" ]] || [[ "$1" == "--help" ]]; then
  echo "${bold}Usage:${reset} ${green}wm-workspace-get-next-empty${reset}"
  echo "  - Print number of the first empty workspace to the right of the"
  echo "    current one (or the current workspace if it is empty)."
  exit 0
fi

# get number of first empty workspace to the right of the current one
current_workspace=$(wm-workspace-get-current)

next_workspace=""
i=$current_workspace
while true; do
  # if workspace doesn't exist, we found it 
  if ! wm-workspace-exists "$i" > /dev/null; then
    next_workspace="${i}"
    break
  fi

  # if workspace is empty, we found it
  if wm-workspace-is-empty "$i" > /dev/null; then
    next_workspace="${i}"
    break
  fi

  # else, increment current workspace and try again
  i=$((i+1))
done

echo "${next_workspace}"