deb-list-desktop-apps.sh

#!/usr/bin/env bash
# list‐desktop‐apps.sh
# Requires: apt-rdepends
# Prints:  package<TAB>total-size-in-MiB (including all Depends)

set -e

# 1) find all packages that install a .desktop file
mapfile -t desktop_pkgs < <(
  dpkg-query -S /usr/share/applications/*.desktop 2>/dev/null \
    | cut -d: -f1 \
    | sort -u
)

# 2) for each desktop package, get its full DEPENDS tree, sum Installed-Size
for pkg in "${desktop_pkgs[@]}"; do
  # collect recursive Depends (no Recommends, no Suggests, only installed ones)
  mapfile -t deps < <(
    apt-rdepends --state-follow=Installed --follow=DEPENDS \
      --no-recommends --no-suggests "$pkg" 2>/dev/null \
    | grep -v '^ '
  )
  # include the package itself & uniquify
  mapfile -t allpkgs < <(printf "%s\n%s\n" "${deps[@]}" "$pkg" | sort -u)

  # now sum Installed-Size for each pkg (in KiB)
  total_kib=0
  for p in "${allpkgs[@]}"; do
    # dpkg-query gives size in KB
    size_kib=$(dpkg-query -W -f='${Installed-Size}\n' "$p" 2>/dev/null || echo 0)
    total_kib=$(( total_kib + size_kib ))
  done

  # convert to MiB with one decimal
  total_mib=$(awk "BEGIN {printf \"%.1f\", $total_kib/1024}")
  printf "%-30s %6s MiB\n" "$pkg" "$total_mib"
done | sort -k2 -h