rebuild (install) debian packages that depend on libappindicator with libayatana-appindicator (tested on debian 11 with discord and keeweb)

replace-appindicator.sh

#!/bin/bash

function usage() {
    cat <<USAGE
    Usage: $0 [options] <package.deb>
    Options:
        --install:  install after rebuild
        --cleanup:  remove tmpfiles after
USAGE
    exit 1
}

INSTALL=false
CLEANUP=false

while [ "$1" != "" ]; do
    case $1 in
    --install)
        INSTALL=true
        ;;
    --cleanup)
        CLEANUP=true
        ;;
    *)
        PKG=$1
        NEWPKGNAME=`echo $PKG | awk 'BEGIN{FS=OFS="."}{NF--; print $0"-fixed.deb"}'`
        ;;
    esac
    shift
done

TMP=/tmp/tmp-replace-appindicator
rm -r $TMP
mkdir -p $TMP
dpkg-deb -x $PKG $TMP/unpacked
dpkg-deb -e $PKG $TMP/unpacked/DEBIAN
sed -i 's/libappindicator/libayatana-appindicator/g' $TMP/unpacked/DEBIAN/control
dpkg -b $TMP/unpacked $NEWPKGNAME
if [[ $INSTALL == true ]]; then
    echo "installing $NEWPKGNAME"
    sudo apt --yes --fix-broken install ./$NEWPKGNAME
fi

if [[ $CLEANUP == true ]]; then
    echo "cleaning up $TMP"
    rm -r $TMP
fi