Create contact sheets from CR2 and JPG photos

contact-sheets.sh

#!/bin/bash

# Create 7x6 contact sheets
# @jbuchbinder
#
# Dependencies:
# - dcraw
# - imagemagick

SIZE=500
ROWS=6
FONTSIZE=32
DEST=/media/$USER/ARCHIVE/Photos/contact-sheets

#--------------------------------------------------------------------------------------------------------

BATCH=$(( $ROWS * 7 ))

for D in "$@"; do
	ITER=0
	ls "$D"/*.??? | xargs -n $BATCH | while read X; do
		ITER=$(( $ITER + 1 ))
		FN=$( basename "$D" )-$( printf '%03d' $ITER ).jpg
		if [ ! -f "$DEST/$FN" ]; then
			echo "Creating contact sheet $FN"
			FILES=""
			REMOVELIST=""
			for F in $X; do
				case $F in
					*JPG|*jpg)
						FILES="$FILES $F"
						;;

					*CR2)
						BN=$( basename "$F" )
						dcraw -e $F
						mv ${F//.CR2}.thumb.jpg /tmp/${BN//.CR2}.thumb.jpg
						REMOVELIST="$REMOVELIST /tmp/${BN//.CR2}.thumb.jpg"
						FILES="$FILES /tmp/${BN//.CR2}.thumb.jpg"
						;;
				esac
			done

			montage -verbose -label '%f' -font Ubuntu -pointsize ${FONTSIZE} \
				-background '#000000' -fill 'gray' -define jpeg:size=${SIZE}x${SIZE} \
				-geometry ${SIZE}x${SIZE}+2+2 -auto-orient $FILES "$DEST/$FN"
			echo "Cleaning up"
			rm -v $REMOVELIST
		else
			echo "Skipping existing contact sheet $FN"
		fi
	done
done

I could, at least in theory, rewrite it in Go. I just haven't gotten around to doing it; probably a case of "it works well enough for me".