Diff recursively though all subfolders and then plot identity relation with circo (graphviz, dot)

diff_circo

#!/bin/bash
# 
# ========================================
# Diff recursively and then render the identity relation between the files using graphviz circo.
# ========================================
#
# Go to a folder with your subdirectories you want to compare, then call "diff_circo".
#
# Copyright (c) 2015, Peter Schwede pschwede@posteo.de
#
#
#    Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided #that the above copyright notice and this permission notice appear in all copies.
#
#    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED #WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL #DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER #TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.



set -e
set -x

tmpdir=$(mktemp -d)
trap 'rm -r $tmpdir' ERR EXIT

for n in */; do
	echo $n
done > $tmpdir/nodes.txt

for a in */; do
	a=$(basename $a)
	while read; do
		diff -sqr "$a" "$REPLY" || echo -en ""
	done < <(tail -n +$(ls -1d */ | grep -n "^$a/$" | cut -d':' -f1) <(ls -1d */))
done > $tmpdir/diff.log

ls $tmpdir/diff.log

cp -v $tmpdir/diff.log diff.log

for c in "differ" "identical"; do
	echo "graph $c {" > $tmpdir/diff.$c.dot
	awk '/'$c'$/ {print $2, "--", $4}' $tmpdir/diff.log | tr '.' '_' | sed 's/\//__/g' | sed 's/___/__/g' >> $tmpdir/diff.$c.dot
	echo "}" >> $tmpdir/diff.$c.dot

	for format in "ps" "png" "svg"; do
		circo $tmpdir/diff.$c.dot -T$format -o diff.$c.$format
  done
done