Bot or tool for creating sticker packs

[tulir]

In addition to telegram import, there should be some easy way to create new sticker packs.

Somewhat related to #7

[Tigriz]

I created a simple bash script for my use to generate sticker packs automatically.
The output of it is a folder containing a json of uploaded images in current folder, a readme containing a preview and the preview image generated with imagemagick (to be shared on git repos).
However, that's not clean code, it's kinda hardcoded (ex width/height fixed, some infos missing in json, mimetype etc.) but it doesn't affect element when using it.

#!/bin/bash
# usage
# matrixpack token homeserver
# 
# pack name is the folder name
# sticker name is the file name
# /!\ token is sensitive information

if test $# != 2 ; then
  echo 1>&2 "$0:FATAL: $# invalid argument number (expected 2)"
  exit 1
fi

dir=$(pwd)
token=$1
packname=${dir##*/}
homeserver=$2

echo -e "Creating sticker pack\ndir=$dir\npackname=$packname"

json="{\"title\":\"$packname\",\"id\":\"$packname\",\"stickers\":["
first=0
for f in *
do
  if test $first != 1 ; then
    first=1
  else json="$json,"
  fi
  mxc=$(curl -X POST -H "Content-Type: image/png" --data-binary "@$f" "https://$homeserver/_matrix/media/r0/upload?access_token=$token" | python3 -c "import sys, json; print(json.load(sys.stdin)['content_uri'])")
  json="$json{\"body\":\"$f\",\"info\":{\"h\":128,\"w\":128,\"thumbnail_url\":\"$mxc\"},\"msgtype\":\"m.sticker\",\"url\":\"$mxc\",\"id\":\"$f\"}"
done
montage * "preview.png"
mkdir "$packname"
mv "preview.png" "$packname"
echo -e "### $packname  \n![Preview of $packname](preview.png)" > "$packname/README.md"
echo -n "$json]}" > "$packname/$packname.json"