optimized-web-screenshot.sh

#!/bin/bash
# requirements:
#   - pageres-cli (https://github.com/sindresorhus/pageres-cli)
#     CLI website screenshot tool
#   - crunch (https://github.com/chrissimpkins/Crunch)
#     PNG image optimizer
# 
# usage:
#   see https://github.com/sindresorhus/pageres-cli#usage
#   don't use `--format` argument, let script do it automatically
#   it will result as PNG, because Crunch only support PNG
# 
# output: inside directory "pageres_{date}_{time}_{nanoseconds}"

if [ $# -eq 0 ]; then
  pageres --help
  exit 1
fi

set -e

# get date, time, and nanoseconds as timestamp
timestamp=$(date +%F_%T_%N)

(
  # create directory with current timestamp and go inside
  out_dir="pageres_${timestamp}"
  mkdir $out_dir
  cd $out_dir

  echo "Taking screenshots..."
  pageres $@ --format png
  out_filenames=$(find * -maxdepth 0 -type f -name "*.png" -print0 | xargs -0)

  echo "Compressing..."
  crunch $out_filenames

  echo "Finishing..."
  for filename in $out_filenames; do
    base_filename=$(basename -s .png $filename)
    mv "${base_filename}-crunch.png" $filename --force
  done
)

echo "Done!"
echo