timestamp_files.sh

#!/bin/bash

    # Setting FONT
FONT_INSTALLED=$(fc-list | grep -i "roboto");
if [ -z "$FONT_INSTALLED" ]; then 
    echo "The Roboto font is not currently installed.";
    FONT_INSTALLED=$(fc-list | grep -i "ubuntu");
    if [ -z "$FONT_INSTALLED" ]; then 
    echo "The Ubuntu font is not currently installed.";
      font="Arial"
    else
      font="Ubuntu";
    fi
else
  font="Roboto";
fi
pointsize="230"
fill_color="white"
stroke_color="black"
stroke_width="5"
gravity="SouthEast"
annotate="+100+100"

intput_format=".JPG"
output_format=".png"
photo="*${intput_format}"

indir="./photo_in/"
outdir="./photo_timestamp/"
files=$indir$photo

_start_time=$SECONDS
_start=1
_end=$(ls ${indir} -Uba1 | grep ${intput_format} | wc -l)
counter=${_start}

################################################################
################################################################
      ### from https://stackoverflow.com/questions/238073/how-to-add-a-progress-bar-to-a-shell-script
      # 1. Create ProgressBar function
      # 1.1 Input is currentState($1) and totalState($2)
function ProgressBar {
      # Process data
  let _progress=(${1}*100/${2}*100)/100
  let _done=(${_progress}*4)/10
  let _left=40-$_done
      # Build progressbar string lengths
  _fill=$(printf "%${_done}s")
  _empty=$(printf "%${_left}s")
  _progress_time=$(($SECONDS - $_start_time))
      # 1.2 Build progressbar strings and print the ProgressBar line
      # 1.2.1 Output example:                           
      # 1.2.1.1 Progress : [########################################] 100%
  printf "\rProgress : [${_fill// /#}${_empty// /-}] ${_progress}%% $((${_progress_time} / 60)) minutes and $((${_progress_time} % 60)) seconds"
}

################################################################
################################################################

      #Check if input dir exists, else quit.
DIR="${indir}"
if [ -d "$DIR" ]; then
   echo "'$DIR' found as input dir, please wait ..."
else
   echo "Error: '$DIR' NOT found. Exit script.";
   exit 1;
fi

      #Check if output dir exists, else create.
DIR="${outdir}"
if [ -d "$DIR" ]; then
   echo "'$DIR' found as output dir, please wait ..."
else
   echo "Warning: '$DIR' NOT found as output dir. Creating output dir.";
   mkdir "$DIR";
fi

    # check if files are there in input dir
if (( ${_end} < 1 )); then
  echo "Error: No files [${_end}] found in [${files}]."
  exit 1;
fi

################################################################
################################################################

echo "Adding timestamp to all [${_end}] the images.";
for file in $files ; do
    ProgressBar ${counter} ${_end}
        #retrieve date for timestamp and sanatize
    img_date=$(identify -format %[EXIF:DateTimeOriginal] "${file}");

        #sanatize date and format for date funtion
    date=$(echo ${img_date} | cut -d" " -f1 | tr ":" "-");
    time=$(echo ${img_date} | cut -d" " -f2 );
    img_date=$date" "$time;

        #re-create date for the timestamp
    my_date=$(date -d "${img_date}" +"%Y-%m-%d %H:%M");

        #retrieve the date of the image for the new filename and sanatize
    datetime=$(identify -format "%[EXIF:DateTimeOriginal]" "${file}" | tr " " "_" | tr ":" "-");
    
        #retrieve the filename of the image for the new filename
    inname=$(identify -format "%t" "${file}");

        #convert the image with timestamp to png
    convert ${file} -font "${font}" \
     -pointsize "${pointsize}" \
     -fill "${fill_color}" \
     -stroke "${stroke_color}" \
     -strokewidth "${stroke_width}" \
     -gravity "${gravity}" \
     -annotate "${annotate}" "${my_date}" \
     "${outdir}${datetime}_${inname}${output_format}";
     ((counter=counter+1)) 
done
printf '\nAdding timestamp is finished!\n'
run_time=$(($SECONDS - $_start_time))
echo "This took $((${run_time} / 60)) minutes and $((${run_time} % 60)) seconds."

# LICENSE
    ## CC BY-SA 4.0
    ## https://github.com/edzob/photo_scale_timestamp_script