#!/bin/bash

align_dpkgs()
{
    local source_file="$1"
    local letter="$2"
    
    # Find the longest position.
    local max=0
    while read -r line; do
	if [[ $line =~ '||/ N' ]]; then
	    local pos=$(expr index "$line" "$letter")
	    if (( $pos > $max)); then
		max=$pos
	    fi
	fi
    done < "$source_file"

    # Insert spaces.
    local currentpos=0
    local middle=""
    while read -r line; do
	#echo -e "$line\n"
	if [[ $line =~ '||/ N' ]]; then
	    local currentpos=$(expr index "$line" "$letter")
	    currentpos=$(($currentpos-1))
	    local diff=$(($max-currentpos-1))
	    middle=$(printf %${diff}s)

	    local start=${line:0:currentpos}
	    local end=${line:currentpos}
	    echo "${start}${middle}${end}"

	elif [[ $line =~ 'ii ' ]]; then
	    local start=${line:0:currentpos}
	    local end=${line:currentpos}
	    echo "${start}${middle}${end}"
	fi
    done < "$source_file"
}

# ##############################################################################

# Put all dpkg -l output in one file.
echo "" > tmp
for guest in $(cat machines.txt) ;
do
    ssh -t admin666@$guest dpkg -l --no-pager >> tmp
done

# Align the column Version.
align_dpkgs "tmp" "V" > tmp2

# Align the column Architecture.
align_dpkgs "tmp2" "A" > tmp

# Output cleaned lines.
grep  "^ii" tmp | sort | uniq

# Clean temprary files.
rm tmp tmp2