Bashscripts.org

#!/bin/bash
: 'begin'
## set -x                                            ## used for debugging purposes only
##
## @(#) carpcalc.sh              this code is an enhancement to <crouse's> original code
##                               which was written to calculate 'board footage' for some
##                               lumberyards or carpenters.
##
## programmer: mekanik
## revision:   1.0               program development enhancement to "bfcalc".  with this
##                               enchancement, i have added variable checking along with
##                               it being all arguement driven.
## date:       20050202
##
## this program has been originally written by [mekanik [root23 NOS<- AT ->PAM gmail.com]
##
## -------------------------------------------------------------------------------------
##  This software is licensed under the GPL - GNU General Public License
## -------------------------------------------------------------------------------------
##
## my disclaimer:
##   first of all, i am _NOT_ responsible for anything bad that might happen because
##   of this program...it doesn't do anything bad on my system, but it is not my fault
##   if it does something bad on your system...
##


## -------------------------------------------------------------------------------------
## global vars and functions
## -------------------------------------------------------------------------------------
_version="1.0"
_thick=$2
_width=$4
_length=$6


_usage_short() {
## -------------------------------------------------------------------------------------
## function to display the short help usage for the program
##
cat <<- _usage_
   usage:   `basename $0`  [-t thickness] [-w width] [-l length] [-h|-help] [-v|-version]
_usage_
}

_usage_long() {
## -------------------------------------------------------------------------------------
## function to display the long help usage for the program
##
cat <<- _usage_
        usage:   `basename $0`  [-t thickness] [-w width] [-l length] [-h|-help]

        -t   =  thickness of the wood in inches
        -w   =  width of the wood in inches
        -l   =  length of the wood in inches

        -h   =  display the verbose help usage
        -v   =  display the program version

_usage_
}


## -------------------------------------------------------------------------------------
## main program
##
if   [ $# = 0 ];then
     _usage_short
     exit 99
elif [ X$1 = X"-h"  -o  X$1 = X"-help" ] && [ $# = 1 ];then
     _usage_long
     exit 98
elif [ X$1 = X"-v"  -o  X$1 = X"-version" ] && [ $# = 1 ];then
     printf "program '`basename $0`' version:  $_version\n"
     exit 97
elif [ $# != 6 ];then
     _usage_short
     exit 96
elif [ $# = 6 ];then
     if   [ X$1 != X"-t" ];then
          _usage_short
          exit 95
     elif [ X$3 != X"-w" ];then
          _usage_short
          exit 94
     elif [ X$5 != X"-l" ];then
          _usage_short
          exit 93
     fi
fi


## reject if argument:  contains any character other than digits or period,
##                      begins with a period, ends with a period, and/or it
##                      contains 2 (or more) adjacent periods
##
## go ahead and strip off whitespace, backslash, forwardslash, blah blah blah...
##
_thick=`printf "$_thick" | sed 's/[ /\//]//g'`
_width=`printf "$_width" | sed 's/[ /\//]//g'`
_length=`printf "$_length" | sed 's/[ /\//]//g'`

for _check in $_thick $_width $_length;do
   case "$_check" in
      *[!0-9.]*|.*|*.|*..*|0|*.*.*|0.0)
      printf "one of the variables isn't correct, check an re-run.  exiting\n"
      ##return 1 ;;
      exit 100 ;;
   esac
done

## go ahead and split the args into positional parameters just to verify that
## there is only one element per arguement, i think that this is doing something
## somewhat useful.
##
set -- "${_thick// / }"
set -- "${_width// / }"
set -- "${_length// / }"

_chkt=`printf "${#_thick[@]}\n"`
_chkw=`printf "${#_width[@]}\n"`
_chkl=`printf "${#_length[@]}\n"`

if   [ $_chkt != 1 ];then
     exit 89
elif [ $_chkw != 1 ];then
     exit 88
elif [ $_chkl != 1 ];then
     exit 87
fi


## now that we've got all the args tested and validated, plug them into the
## calulations and we get the output.
##
printf "This board contains: \
`printf "scale = 4; (($_thick * $_width * $_length) / 12)\n"\
| bc -l 2>/dev/null` board feet.\n"

: 'end'