#!/usr/bin/env bash

# Linux hack to benefit from Google Picasa face tagging on NAS drive photos.
# My wife has tagged bazillions of faces in Photos stored on our NAS using
# Picasa in Windows. This script creates a folder for each "contact" (person
# face tagged) and then places local links arranged in folders by contact for
# each photo on the NAS
#
# Author: Mark Ruff
# Date: 19 May 2012

# basedir that the photos are stored in
BASEDIR="/media/Photos/"

# contacts - file that the contacts are stored in
CONTACTS="/media/xxxxxx/Google/Picasa2/contacts/contacts.xml"

# targetdir for the links to photos to be stored 
TARGETDIR="/home/mark/pics/photo_tags"

if [ $# -ne 2 ]
then
    SAFECALL=$(echo $0 | sed 's/[][\.*^$/]/\\&/g')
    grep "contact id" contacts.xml | sed "s/^.*\"\(.*\)\" name=\"\(.*\)\" modified.*$/"$SAFECALL" \1 \2/" | bash
    exit
fi

# make our subdirectory
TAG=$1
NAME=$2
mkdir -p $TARGETDIR/$NAME
# clean subdirectory for sed
SUBDIR=$(echo $TARGETDIR/$NAME | sed 's/[][\.*^$/]/\\&/g')

function spider {

    # recursively drop down into each directory within the current directory
    for DIR in *
    do
        if [ -d "$DIR" ]
        then
            cd "$DIR"
            spider
            cd ..
        fi
    done
    # in each directory is a Picasa.ini file which lists each photo along with
    # the tags. The file contains [FILENAME] followed by a list of tags.
    # So we grep for the tag and pull the line above, then grep for just the
    # jpegs (and only show the file name, not the [ ]). Pipe the file names
    # into sed to create the cp command and enclose the filename in quotes
    # in case it contains spaces. Finally pipe the output (a list of cp
    # commands) into sh
    PWD=$(pwd | sed 's/[][\.*^$/]/\\&/g')
    grep -B2 $TAG* Picasa.ini 2>/dev/null | grep -io [^\[].*jpg | sed "s/\(.*\)/ln -s \"$PWD\/\1\" $SUBDIR/" | sh 
}

cd $BASEDIR
spider