Enhance jpeg date detection

organise-photos

@@ -4,6 +4,9 @@
 # organises them into a folder structure based on the month and year
 # they were last modified (taken).
 
+# Sources and References
+#  - Bash controlled paralellisation - http://unix.stackexchange.com/a/216475/64687
+
 DRY_RUN=false
 
 while test $# -gt 0
@@ -28,13 +31,36 @@ do
 	shift
 done
 
-find . -maxdepth 1 \( -iname "*.jpg" -o -iname "*.mp4" \) -print0 | while read -r -d '' filename
+Months=(Zero January February March April May June July August September October November December);
-do
+
+handle_file() {
+	local filename=$1;
+	
 	echo -ne "Processing ${filename} - ";
+	
+	rawFilename=$(basename "${filename}");
+	extension=${filename##*.};
+	extension=${extension,,};
+	
 	takenYear=$(date -r "${filename}" +%Y);
 	takenMonth=$(date -r "${filename}" +%-m);
 	takenMonthText=$(date -r "${filename}" +%B);
 	
+	# Extract the date taken from jpegs
+	if [[ "${extension}" == "jpg" ]] || [[ "${extension}" == "jpeg" ]];
+	then
+		takenDate=$(jhead "${filename}" | grep -i 'Date/Time' | cut -d' ' -f6-7);
+		takenChars=$(echo ${takenDate} | wc -c);
+		if [[ ${takenChars} -gt 1 ]];
+		then
+			takenYear=$(echo ${takenDate} | cut -d ':' -f1);
+			takenMonth=$(echo ${takenDate} | cut -d ':' -f2);
+			takenMonthUnpadded=$(echo ${takenMonth//0});
+			takenMonthText=${Months[$takenMonthUnpadded]};
+		fi
+	fi
+	
+	
 	newFolder="${takenYear}/${takenMonth}-${takenMonthText}/";
 	newFilename="${newFolder}${filename}";
 	
@@ -49,8 +75,18 @@ do
 	mv "${filename}" "${newFilename}";
 	
 	echo Done\!;
+}
+
+# Set the number of paralell jobs to the number of cpus
+N=$(grep -c ^processor /proc/cpuinfo);
+
+find . -maxdepth 1 \( -iname "*.jpg" -o -iname "*.mp4" -o -iname "*.avi" -o -iname "*.png" \) -print0 | while read -r -d '' filename
+do
+	((i=i%N)); ((i++==0)) && wait;
+	handle_file "${filename}"
 done
 
 echo "*** Complete! ***"
 
 exit 0
+