#!/bin/bash
#<pre><b>
# Script     : getlsps
# Version    : 1.0
# Author     : Roland Rashleigh-Berry
# Date       : 23-Feb-2007
# Purpose    : To determine the line size, page size and number of pages of an
#              output listing.
# SubScripts : none
# Notes      : This utility prints out three numbers after scanning the file:
#              1) Line size (maximum number of characters in a line)
#              2) Page size (maximum lines per page)
#              3) Pages (total page count)
#
#              You can use these values to make decisions on how you want the
#              print layout.
#
# Usage      : getlsps file.ext
#              
#===============================================================================
# OPTIONS:
#-opt- -------------------------------description-------------------------------
#  e   (switch) echo all supplied parameters at start
#  f   (value)  parameter value of the input file
#===============================================================================
# PARAMETERS:
#-pos- -------------------------------description-------------------------------
#  1   file name (only one allowed)
#===============================================================================
# AMENDMENT HISTORY:
# init --date-- mod-id ----------------------description------------------------
# rrb  22Feb07         Shorten a comment line
# rrb  23Feb07         Remove DOS CR in echo of parameters
#===============================================================================
# This is public domain software. No guarantee as to suitability or accuracy is
# given or implied. User uses this code entirely at their own risk.
#===============================================================================

# Define give-usage-message-then-exit function.
usage () {
  echo "Usage: getlsps -e -f <field> file.ext" 1>&2
  exit 1
}


# The following variable names and defaults have been generated for you
# to help you start. You can rename the variables to something more 
# meaningful but be sure to change all occurrences of that name in the code.
switche=0               # Default switch=off for echo input file                             
valuef=1                # Default value for field


# "case" statement for action to take on selected options
while getopts "ef:" param ; do
  case $param in
   "?") # bad option supplied
        usage
        ;;
   "e") # (switch) echo input file name
        switche=1
        ;;
   "f") # (value) field
        valuef=$OPTARG
        ;;
  esac
done


# shift to bring first parameter to position 1
shift $(($OPTIND - 1))


if [ $# -ne 1 ] ; then
  echo "Usage: getlsps filename (only one file name allowed)" 1>&2
  usage
fi


file=$(echo "$@" | awk '{print $fieldno}' fieldno=$valuef)


# echo the input parameters (without a DOS CR) if requested
if [ $switche == 1 ] ; then
  inparams=$(echo "$@" | sed 's%\r$%%')
  echo -n "$inparams "
fi


gawk '
# Begin block - initialise page count to 1
BEGIN {pages=1}

# ======== Main code block start ========
{

# A form feed character in position one 
# indicates the first line of a new page
if (index($0,"\f")==1)
  {
  ls=length($0)-1  # subtract 1 so we do not count the form feed
  pages++          # increment the page count
  if (lines > maxps ) 
    maxps=lines    # set maxps (maximum number of lines on a page)
  lines=1          # reset line count to 1 for first line on new page
  }
# Any other line
else
  {
  ls=length($0)
  lines++          # increment the line count
  }

# Set maximum line size
if (ls>maxls)
  maxls=ls         # set maxls (maximum line size)
  
}
# ======== End of main code block ========

# End block - print results
END {
if (lines > maxps ) 
  maxps=lines    # set maxps (maximum number of lines on a page)
print maxls, maxps, pages
}' "$file"