List AUR packages in dependency order so that they can be rebuilt

aur_in_dependency_order.bash

#!/bin/bash
#
# Get all AUR dependencies in the order which they must be built.
#
# Author: hauptmech@gmail.com

# Keep track of packages we've seen already
declare new_pkg=''

# Only dive deeper if we haven't seen this pkg before
function recurse_if_not_seen_before {
    if [[ ! $new_pkg =~ $1 ]]; then
        new_pkg="$new_pkg $1"
        depth_first_dependency_list $1
    fi
}


# Recursively dive into AUR packages so we can install them in order
function depth_first_dependency_list {

  for item in `package-query -Qm -f %D $1`; do
    recurse_if_not_seen_before $item
  done

  # Get the name of this package. Will be empty if a non AUR package
  # Necessary because this item might be a non-aur dependency of an aur package
  RES=`package-query -Qm -f %n $1`

  # Only echo non empty names to avoid empty lines
  if [[ ! -z $RES ]]; then
    echo $RES
  fi
}

# Main code
# Handle multiple packages given as arguments or via pipe
if [[ ! -z $1 ]]; then
    for item in $*; do
        recurse_if_not_seen_before $item
    done;
else
    while read item 
    do
        recurse_if_not_seen_before $item
    done < /dev/stdin
fi

example.bash

pacman -Qmq | grep ros-indigo | ./aur_in_dependency_order.sh