#!/bin/sh
#
#---makeIphoneImageNamesSensible
#
#   Shell script for linux, Windows/Cygwin, or MacOS.  
#   Last updated 2020-08-16 to handle images taken within the same second.
#
#   Converts JPG files from iPhones (with stupid names like IMG_0001.JPG)
#   into files named with the date and time stamp from the image file.
#   (E.g. 20171003_151026.jpg)
#
#   Usage: run it in a directory containing .JPG files downloaded from an
#   iPhone. Renames all of them.
#
#   Copyright (C) 2017, by Charles Roth, 2017-10-04, croth (a t) thedance (d o t) net
#   Released under the Creative Commons Attribution-only ("BY") license.
#   (See https://en.wikipedia.org/wiki/Creative_Commons_license#Seven_regularly_used_licenses)
#----------------------------------------------------------------------------

tmp=/tmp/makeIphoneImage$$
rm -f $tmp

for x in `ls *.JPG *.jpg 2>/dev/null`; do
   file $x >$tmp
   if grep "datetime=" $tmp >/dev/null 2>/dev/null; then
      timestamp=`sed <$tmp "s/^.*datetime=//" | sed "s/,.*$//" | sed "s/://g" | sed "s/ /_/" | sed "s/\]//"` 
      if test -f $timestamp.jpg; then
         count=1
         base="$timestamp"
         while test -f ${base}_${count}.jpg; do
            count=`expr $count + 1`
         done
         mv $x ${base}_${count}.jpg
      else
         mv $x $timestamp.jpg
      fi
   else
      echo "Cannot find datetime in $x" >&2
   fi
done
rm -f $tmp