Skeleton shell script

shell script skeleton

#!/bin/bash

set -o nounset
set -o errexit
set -o pipefail

main(){
  export _K="$(tput setaf 0)"
  export _R="$(tput setaf 1)"
  export _G="$(tput setaf 2)"
  export _Y="$(tput setaf 3)"
  export _B="$(tput setaf 4)"
  export _M="$(tput setaf 5)"
  export _C="$(tput setaf 6)"
  export _W="$(tput setaf 7)"
  export _Z="$(tput sgr0)"
  export _BOLD="$(tput bold)"
  export _BLINK="$(tput blink)"
  export _REVERSE="$(tput smso)"
  export _UNDERLINE="$(tput smul)"
  export SCRIPTDIR="$( dirname "$( readlink -f "${BASH_SOURCE[0]}" )")"
  export RUNOUT=${TMP:/tmp}/.$$.run
  trap .at.exit INT TERM EXIT
  $@
  return 0
}

.at.exit(){
  local _ret=$?
  [[ -f $RUNOUT ]] && cat $RUNOUT
  [[ "0" != "$_ret" ]] && echo -e "$_R  Exiting with code: $_ret $_Z"
  rm -f $RUNOUT
  exit $_ret
}

.run(){
  local _msg="$1"
  shift
  echo -e "$_R COMMAND FAILED $_Z" > $RUNOUT
  echo -e "$_Y $@ $_Z" >> $RUNOUT
  echo "" >> $RUNOUT
  ($@) >> $RUNOUT 2>&1 &
  local _pid=$!
  local _spin='-\|/'
  local i=0
  while kill -0 $_pid 2>/dev/null; do
    i=$(( (i+1) %4 ))
    printf "\r$_Y $_msg ${_spin:$i:1} $_Z"
    sleep .1
  done
  wait $_pid
  rm $RUNOUT
  echo ""
}


main $@
exit 0