timestamp_photos.sh

#!/bin/bash

export PATH=/usr/bin:/bin:/usr/sbin:/sbin

# Create subfolder to store renamed files
createDestination() {
    destination="$(dirname "$file")/sorted"
    mkdir -p "$destination"
}

# Check for file MIME type
hasMIMEType() {
    file -I "$file" | grep -q "$1"
}

# Send notification to user
sendNotification() {
    osascript <<-EndOfMessage
    display notification \
    "$1" \
    with title "Rename (Timestamp)"
EndOfMessage
}

# Determine file extension
setFileExtension() {
    if hasMIMEType "image/jpeg"
    then
        extension="jpg"
    elif hasMIMEType "image/heic"
    then
        extension="HEIC"
    elif hasMIMEType "image/heif"
    then
        extension="HEIC"
    elif hasMIMEType "video/quicktime"
    then
        extension="mov"
	elif hasMIMEType "video/mp4"
    then
        extension="mp4"
	elif hasMIMEType "video/m4v"
    then
        extension="m4v"
    else
        return 1
    fi
}

# Retrieve EXIF timestamp from media file
getTimeStamp() {
	local -r timestampGTM=$(mdls -name kMDItemContentCreationDate -raw "$file")
	local -r timestampRaw=$(date -j -f "%F %T %z" "$timestampGTM" +"%Y-%m-%d %H:%M:%S" | cut -d ' ' -f -2)
	timestamp=${timestampRaw//:/-}
}

# Rename file, handle timestamp collisions
renameFile() {
    # Exit function if file type is not supported
    setFileExtension || return 0

    getTimeStamp || return 0

    createDestination || return 1

    # Check if to be renamed file already exists
    if [[ -f "$destination/$timestamp.$extension" ]]
    then
        # If file exists append random string to file
        local -r randomString=$(md5 -q "$file")
        cp "$file" "$destination/$timestamp-$randomString.$extension"
    else
        cp "$file" "$destination/$timestamp.$extension"
    fi
}

# Send notification to user after the process has finished
presentResults() {
    # Count files in destination folder
    local counter=0
    for file in "$destination"/*.*
    do
        (( counter ++ ))
    done

    # Check if renaming was successful
    if [ $counter != 0 ] && [ -n "$destination" ]
    then
        sendNotification "$counter photos/videos have been renamed. Opening destination folder…"
        open "$destination"
    else
        sendNotification "Could not renamd any photos/videos."
    fi
}

# Main loop to collect input files from Automator
processFiles() {
    while read -r file; do
        renameFile
    done
}

sendNotification "Processing photos/videos.\\nThis can take a while…"

processFiles

presentResults

exit 0