Shell Programming and Scripting

prArgv VAL1 VAL2 DESC VAL3 VAL4 v2d1 s4 p15

1234VAL1 VAL2 DESC     # print statement shifted by 4 characters to the right.

prArgv() {

  frmt_v2d1="${bGn}%s %s${nWh}    %s${nColor}\n"

  #=============================================================================
  # Set location of format tag and the shift
  lastArgv="$#"  # lastArgv =

  # Position of last argument equals the number of arguments
  frmtPos=`expr $lastArgv - 1`  # frmtPos =

  # Position of argument before last
  shiftpos=$lastArgv  

  #=============================================================================
  # Construct variable names from where to capture the required format
  # Construct shift format variable, 's' followed by amount of shift
  frmtShift="${!shiftpos}"  # frmtShift = "s2"

  # Construct arguments format variable for colored output
  frmtArgv="frmt_${!frmtPos}"
 
  #=============================================================================
  # Construct print format
  # Shift tag detected

  if [[ "${!shiftpos}" =~ ^s[0-9]+$ ]] ; then
      frmt="${!frmtShift}${!frmtArgv}"

  # Position tag detected
  elif [[ "${!shiftpos}" =~ ^p[0-9]+$ ]] ; then
      frmt="${!frmtShift}${!frmtArgv}"

  # No shift or position tags detected
  else
      frmt="${!frmtArgv}"
  fi
  echo "frmt = $frmt"

  #=============================================================================
  #  Compute number of arguments to print. This is done by adding the numbers
  # in the format tag together.
  sepString=`echo "${!frmtPos}" | sed 's/\([0-9][0-9.]*\)/ & /g'`
  strArr=( $sepString )
  
  # Add the numeric fields together
  n=0
  for str in "${strArr[@]}"; do
     if [[ "$str" =~ ^[0-9]+$ ]]; then
       n=$((n+str))
     fi
  done
   
  #=============================================================================
  # Compute the total length of all user arguments excluding the description
  m=$((n-1))
  strArr=( ${@:1:$m} )
  echo "str = ${@:1:$m}"
  totlLen=0
  for str in "${strArr[@]}"; do
    lenArgv=${#str}
    totlLen=$((totlLen+lenArgv))
  done
  echo "totlLen = $totlLen"
  #  str=${!n}
  #  strLen=${#str}
  #  echo "str, strLen = $str, $strLen"
  printf "$frmt" "${@:1:$n}"  # print command
}