#!/bin/bash

# Script to prepare photos for Facebook or similar,
# by Richard H. Tingstad (richard.tingstad+fb@gmail.com)
#
# Makes a directory ('facebook')
# Copies all jp(e)g files there
# Gives copied files names like YYYYMMDDHHMMSS-C.jpg
# Prompts user for further action
# Resizes all copy images to max 720px width/height
# and removes metadata
# Renames all copied files to 00000.jpg,00001.jpg,...

dir='facebook'
echo "Creating directory '$dir'..."
if ! mkdir "$dir"
then
 exit 1
fi
c=0
find . -maxdepth 1 -path ./$dir -prune -o \( -iname '*.jpg' -or -iname '*.jpeg' \) | while read i
do
 if [ ! -f "$i" ]
 then
  echo "Skipping non-regular file '$i'"
  continue
 fi
 t=`identify -verbose "$i" |egrep -m 1 '[Ee]xif:DateTime'|sed 's/[^0-9]//g'`
 if [ "$t" = "" ]
 then
  y=`stat -c %y "$i" | sed 's/[^0-9]//g'`
  z=`stat -c %z "$i" | sed 's/[^0-9]//g'`
  if [[ "$y" < "$z" ]]
  then
   t="$y"
  else
   t="$z"
  fi
  if echo $t | egrep -q '[0-9]{15,}'
  then
   t=`echo $t | egrep -o '^[0-9]{14}'`
  fi
 fi
 dest="./$dir/$t-$c.jpg"
 echo "$i > $dest"
 cp "$i" "$dest"
 c=$[ $c + 1 ] 
done
echo "Files have been copied to directory '$dir' and renamed (sorted) according to creation time."
echo "Do you also want to resize them, strip them of metadata, and give them anonymous filenames [Y/n]?"
read a
if [ "$a" == "n" ]
then
 exit 0
fi
cd $dir
#Resize photos and remove metadata.
find . -name '*.jpg' | while read i
do
 echo "Resizing and deleting metadata from $i"
 mogrify -strip -resize 720x720 $i
done

#Anonymize file names.
c=0
for i in `ls *.jpg`
do
 f=`printf "%05u" "$c"`
 echo "$i > $f.jpg"
 mv $i $f.jpg
 c=$[ $c + 1 ]
done

cd ..