#! /bin/bash
#
#  Filename:  findfirst2
#
#  Programmer:  Br. David Carlson
#
#  Date:  February 28, 2003
#
#  This script finds the first file within the directory tree rooted at the first command-line
#  parameter that matches the target given as the second command-line parameter.  Output is
#  to standard out and gives the full pathname of the located file or a not found message.
#  Note that this script assumes that it has access to all directories in the above-mentioned
#  directory tree.  If this is not true, you will get error meessages and be left with
#  temporary files in /tmp.
#
#  Syntax:
#     findfirst2 StartDir TargetFilename


#  The following function processes one directory.  The input parameters are:
#     1   the name of the directory to process
#     2   the filename to look for
#  This recursive function finds the first instance of the desired filename in the directory
#  tree rooted at the directory given as the first parameter.  If a match is found, the complete
#  pathname for the matching file is printed to standard output and the global variable found
#  is given the value of 1.
onedir()
   {
   # Local variables for this function:
   local TMP
   local OLDDIR
   local DIR
   local fname

   # bash syntax for adding 1 to a variable:
   count=$[$count + 1]

   TMP=/tmp/findfirst.$$.$count
   OLDDIR="`pwd`"
   cd "$1"
   DIR="`pwd`"

   ls > $TMP
   sync

   while read fname
   do
      if [ -d "$fname" ]
      then
         # Recursive call of the function:
         onedir "$fname" "$2"
         if [ "$found" -eq 1 ]
         then
            cd "$OLDDIR"
            rm $TMP
            return
         fi
      elif [ "$fname" = "$2" ]
      then
         found=1
         echo "${DIR}/$fname"
         cd "$OLDDIR"
         rm $TMP
         return
      fi
   done < $TMP

   rm $TMP
   cd "$OLDDIR"
   }


# Start of main portion of the script:

if [ $# -ne 2 ]
then
   echo "Error: 2 parameters are needed"
   echo "Syntax: findfirst StartDir TargetFilename"
   exit 1
fi

found=0
count=1

onedir "$1" "$2"

if [ "$found" -eq 0 ]
then
   echo "No match was found"
fi

exit 0