How can I export multiple spritesheets at once?

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OK, I wrote a bash script to first export to GIF then re-export them to png spritesheets (using aseprite each time).

It would be even better as an Aseprite script (so we have a command, can bind a shortcut to it and possibly even a popup window so user can set custom parameters) but I need to have a look at the Lua API.

Note that it creates a temporary “temp” sub-folder to do the job.

#!/usr/bin/env bash

# Posted on https://community.aseprite.org/t/how-can-i-export-multiple-spritesheets-at-once/6165
# Consider porting this to Aseprite Lua API for an integrated menu command

usage() {
  echo "Usage: export_spritesheets_from_aseprite_tags.sh aseprite_filepath

Export all tagged animations in .aseprite file to spritesheets, one spritesheet per tag, to some Export sub-folder,
using the format '[file_basename]_[tag]_spritesheet.png'

Requirements:
- asprite installed and binary in PATH

ARGUMENTS
  aseprite_filepath    Path to aseprite file containing the tagged animations, including extension
"
}

if ! [[ $# -eq 1 ]]; then
  echo "Wrong number of positional arguments: found $#, expected 1."
  echo "Passed positional arguments: $@"
  usage
  exit 1
fi

aseprite_filepath="$1"
shift 1

# Ex: "character"
file_basename=${aseprite_filepath%.*}

# Setup temp dir
rm -rf temp
mkdir -p temp

# 1. Export separate gifs
# Ex: export "Export/character_idle.gif" and "Export/character_attack.gif"
aseprite -b "$aseprite_filepath" --save-as "temp/${file_basename}_{tag}.gif"

# 2. Convert each gif in temp folder to a png spritesheet
pushd temp > /dev/null
	for gif_filepath in *.gif; do
		# Ex: "character_idle"
		animation_file_basename=${gif_filepath%.*}
		# Mute spritesheet metadata json output
		# If you need it, you can add --data "${animation_file_basename}_spritesheet.json" instead
		aseprite -b "$gif_filepath" --sheet "${animation_file_basename}_spritesheet.png" > /dev/null
	done
popd > /dev/null

# 3. Move all spritesheets to Export folder
mkdir -p Export
mv temp/*.png Export/

# Clean up temp dir
rm -rf temp