Shell script to recursively convert JPG and PNG files to HEIC format.

convert-files-to-heic-recursive.sh

#!/bin/bash
#
# This script will convert JPG and PNG files to HEIC format recursively.
#

# Errors are fatal
set -e

GO=""
DELETE=""
JPG=""

function print_syntax() {
	echo "! "
	echo "! Syntax: $0 ( --go | -jpg ) [ --delete ] "
	echo "! "
	echo "! Recursively convert jpeg files to HEIC format or back to jpeg format."
	echo "! "
	echo "! --go - Do the conversion, otherwise this script will run in dry mode."
	echo "! --jpg - Do the reverse and convert HEIC to JPEG. This should be used for uploading to Flickr/Facebook/etc."
	echo "! --delete - Delete files that have been converted"
	echo "! "
	echo "! "
	exit 1
} # End of print_syntax()


if test "$1" == "-h" -o "$1" == "--help"
then
	print_syntax

fi

while test "$1"
do
	if test "$1" == "--go"
	then
		GO=1

	elif test "$1" == "--delete"
	then
		DELETE=1

	elif test "$1" == "--jpg" -o "$1" == "--jpeg"
	then
		JPG=1

	else
		print_syntax

	fi

	shift
done


IFS=$'\n'

function convert_to_heic() {

	#
	# Deternine how many files need to be converted
	#
	NUM=0
	NUM_CHECKED=0
	I=1
	echo "# Calculating number of files to convert (This may take a minute...)"

	for FILE in $(find . -type f \( -iname \*.jpg -o -iname \*.jpeg -o -iname \*.png \))
	do
		TARGET=$(echo ${FILE} | sed -r 's/.[^.]+$/.heic/')

		NUM_CHECKED=$(( NUM_CHECKED + 1 ))
		if test $(( NUM_CHECKED % 100)) == 0
		then
			echo -n "${NUM_CHECKED} files checked.. "
		fi

		if test ! -s "${TARGET}"
		then
			NUM=$(( NUM + 1 ))
			if test $(( NUM % 100)) == 0
			then
				echo -n "${NUM} files need converting.. "
			fi
		fi

	done

	echo

	if test "${NUM}" == 0
	then
		if test "${DELETE}"
		then
			echo "# No files left to convert, but we're deleting files, so keep going..."
		else
			echo "# No files left to convert and we're not deleting anything, bailing out!"
			return
		fi
	fi

	for FILE in $(find . -type f \( -iname \*.jpg -o -iname \*.jpeg -o -iname \*.png \))
	do
		TARGET=$(echo ${FILE} | sed -r 's/.[^.]+$/.heic/')
	
		if test "${GO}"
		then

			if test -s "${TARGET}"
			then
				echo "# Ooops--target file '${TARGET}' already exists, skipping!"

			else
				echo "# Converting file [${I}/${NUM}] '${FILE}' to '${TARGET}'..."
				convert "${FILE}" -format heic "${TARGET}"
				I=$(( I + 1 ))

			fi
		
			if test "${DELETE}"
			then
				echo "# Deleting source file ${FILE}..."

				if test -s "${FILE}"
				then
					rm -fv "${FILE}"

				else
					echo "! Source file '${FILE}' is not a regular file, skipping deletion!"

				fi

			fi

		else
			if test -s "${TARGET}"
			then
				echo "# Ooops--target file '${TARGET}' already exists, skipping!"

			else
				echo "# Dry-Run -- not converting file [${I}/${NUM}] '${FILE}' to '${TARGET}'..."
				I=$(( I + 1 ))

			fi


		fi

	done

} # End of convert_to_heic()


#
# Convert HEIC back to JPEG.
# This is a slimmed down version of convert_to_heic()--it doesn't support deleting files,
# for example, as we normally want all roads to lead to HEIC.
#
function convert_to_jpg() {


	#
	# Deternine how many files need to be converted
	#
	NUM=0
	NUM_CHECKED=0
	I=1
	echo "# Calculating number of files to convert..."

	for FILE in $(find . -type f \( -iname \*.heic  \) )
	do
		TARGET=$(echo ${FILE} | sed -r 's/.[^.]+$/.jpg/')

		NUM_CHECKED=$(( NUM_CHECKED + 1 ))
		if test $(( NUM_CHECKED % 100)) == 0
		then
			echo -n "${NUM_CHECKED} files checked.. "
		fi

		if test ! -s "${TARGET}"
		then
			NUM=$(( NUM + 1 ))
			if test $(( NUM % 100)) == 0
			then
				echo -n "${NUM} files need converting.. "
			fi
		fi

	done

	echo

	if test "${NUM}" == 0
	then
		if test "${DELETE}"
		then
			echo "# No files left to convert, but we're deleting files, so keep going..."
		else
			echo "# No files left to convert and we're not deleting anything, bailing out!"
			return
		fi
	fi

	for FILE in $(find . -type f \( -iname \*.heic  \) )
	do

		TARGET=$(echo ${FILE} | sed -r 's/.[^.]+$/.jpg/')

		if test -s "${TARGET}"
		then
			echo "# Ooops--target file '${TARGET}' already exists, skipping!"

		else
			echo "# Converting file [${I}/${NUM}] '${FILE}' to '${TARGET}'..."
			convert "${FILE}" -format jpg "${TARGET}"
			I=$(( I + 1 ))

		fi
		
		if test "${DELETE}"
		then
			echo "# Deleting source file ${FILE}..."

			if test -s "${FILE}"
			then
				rm -fv "${FILE}"

			else
				echo "! Source file '${FILE}' is not a regular file, skipping deletion!"

			fi

		fi

	done

} # End of convert_to_jpg()


if test ! "${JPG}"
then
	convert_to_heic
else
	convert_to_jpg
fi



echo "# Done!"