#!/bin/sh
 
function printUsage {
 
  echo "Usage: countLines directory [options]"
  echo
  echo "Options:"
  echo " -m=XX   --mask=XX    - The mask may be any grep style regular expression."
  echo " -d=XX   --depth=XX   - The maximum depth of recursion. Defaults to 20."
  echo
  exit
}
 
if [ $# -le 0 ]; then
  printUsage
  exit
fi
 
if [  "$1" == "-v" ]; then
  printUsage
  exit
fi
 
TOTALCOUNT=0
FILEMASK=''
MAXDEPTH=20
 
# Drag out our options...
for i in $@; do
  if [ `echo $i | sed 's/^\(-m=\).*$/\1/'` == "-m=" ]; then
     FILEMASK=`echo $i | sed 's/^-m=\(.*\)$/\1/'`
  elif [ `echo $i | sed 's/^\(--mask=\).*$/\1/'` == "--mask=" ]; then
    FILEMASK=`echo $i | sed 's/^--mask=\(.*\)$/\1/'`
  elif [ "$i" == "$1" ]; then
     continue;
  elif [ `echo $i | sed 's/^\(-d=\)[0-9]*$/\1/'` == "-d=" ]; then
    MAXDEPTH=`echo $i | sed 's/^-d=\(.*\)$/\1/'`
  elif [ `echo $i | sed 's/^\(--depth=\)[0-9]*$/\1/'` == "--depth=" ]; then
    MAXDEPTH=`echo $i | sed 's/^--depth=\(.*\)$/\1/'`
  else
    printUsage
    exit
  fi
done
 
CURDEPTH=0
 
function wcDir {
  FILES=`ls -l $1 | grep ^- | awk '{print $8}' | grep -e "$FILEMASK"`
 
  for i in $FILES; do
    LINES=`wc -l $1/$i | awk '{print $1}'`
    TOTALCOUNT=$(($LINES + $TOTALCOUNT))
  done
}
 
function recurseDir {
  COUNT=`ls -l $1 | grep ^d | awk '{print $8}' | wc -l`
 
  CURDEPTH=$(($CURDEPTH + 1))
 
  if [ $COUNT != 0 ] && [ $CURDEPTH -lt $MAXDEPTH ]; then
    for i in `ls -l $1 | grep ^d | awk '{print $8}'`; do
      recurseDir $1/$i
    done
  fi
 
  wcDir $1
 
  CURDEPTH=$(($CURDEPTH - 1))
}
 
recurseDir $1
 
echo $TOTALCOUNT