simulator

#!/usr/bin/env bash

# tmex 1.0.10

set -euo pipefail

function rand() {
  shuf -i"1-$1" -n1 | tr -d '[:space:]'
}

function sizing() {
  local sizes='' multi=FALSE leading=''
  if (( $( rand 4 ) == 1 )); then
    multi=TRUE
  fi
  for (( idx = "$( rand "$1" )"; idx; idx-- )); do
    if [[ "${multi}" == TRUE ]]; then
      leading=''; (( $( rand 3 ) == 1 )) && leading='.'
      sizes+="${leading}$( rand 19 )."
    else
      sizes+="$( rand 9 )"
    fi
  done
  echo "{${sizes}}"
}

function randlayout() {
  local n="$1" layout='' idx=0 multi=FALSE leading='' panes=0 sizing=''
  if (( $( rand 4 ) == 1 )); then
    multi=TRUE
  fi
  for (( idx = "$( rand "${n}" )"; idx; idx-- )); do
    if (( n > 2 && $( rand 4 ) == 1 )); then
      layout+="[$( randlayout "$(( n / 2 ))" )]"
    elif [[ "${multi}" == TRUE ]]; then
      panes="$( rand 19 )"
      leading=''; (( $( rand 3 ) == 1 )) && leading='.'
      sizing=''; (( $( rand 4 ) == 1 )) && sizing="$( sizing "${panes}" )"
      layout+="${leading}${panes}.${sizing}"
    else
      panes="$( rand 9 )"
      sizing=''; (( $( rand 4 ) == 1 )) && sizing="$( sizing "${panes}" )"
      layout+="${panes}${sizing}"
    fi
  done
  echo "${layout//../.}"
}

function main() {
  local layout
  layout="$( randlayout "${1:-8}" )"
  tmex "LAYOUT=${layout}" --simulator --shellless --layout="${layout}"
}

main "$@"