#!/bin/bash

if [ $1 ]
then
    if [ $1 == '-h' ]
    then
    	echo Usage: prename [dir]
	echo 
	echo renames all jpg, mov, avi files in dir to 
	echo MMDD-hhmmss.{jpg,avi,mov}
	echo 'time and date is based on exif (for jpg),'
	echo 'creation date (for avi, mov),'
	echo 'or corresponding jpg exif date and time'
	echo '(for wav - assuming that the wav file'
	echo 'is an audio annotation for a jpg with the same name)'
	echo 
	exit
    fi
    
    cd $1
fi

# process video
for i in *.avi
do
  if [ $i == \*.avi ]
  then 
      break
  fi
  DATE=`ls --full-time $i | awk '{print $6" "$7}' | awk -F'.' '{print $1}'`
  NNAME=`date -d "$DATE" +%m%d-%H%M%S`
  NNAME=$NNAME.avi
  if [ $i != $NNAME ]
  then 
      mv $i $NNAME
  fi
done

for i in *.mov
do
  if [ $i == \*.mov ]
  then 
      break
  fi
  DATE=`ls --full-time $i | awk '{print $6" "$7}' | awk -F'.' '{print $1}'`
  NNAME=`date -d "$DATE" +%m%d-%H%M%S`
  NNAME=$NNAME.mov
  if [ $i != $NNAME ]
  then 
      mv $i $NNAME
  fi
done


# process audio files
for i in *.wav
do
  if [ $i == \*.wav ]
  then 
      break
  fi
  # related jpg
  RJPG=`echo $i | sed s/\.wav$/\.jpg/`
  # convert jpg name and store a new name for the wav
  NNAME=`jhead -nf $RJPG | sed 's/\(.*\)--> \(.*\).jpg/\2\.wav/'`
  # rename wav
  if [ $NNAME ]
  then
      mv $i $NNAME
      if [ $? -ne 0 ]
	  then
	  echo "A JPG file for the $i is missing."
	  read
      fi
  fi
done

# process jpg files
jhead -nf *.jpg >/dev/null