Create a temporary autopep8'ed version of a Python script and diff(meld/diffuse) it with the original

ap8diff.sh

#!/bin/bash

set -o nounset
set -o errexit

if [ "$#" == "0" ]; then
  echo "usage: $0 [autopep8 options] input.py"
  exit 1
fi

ap8ed=$(mktemp)
input=$@
infile=( $( for i in ${input[@]}; do echo $i; done | grep .py$ ) )

differs="diff meld diffuse"
for d in $differs; do
  command -v $d >/dev/null && differ=$d
done


autopep8 --max-line-length=999 $input > "$ap8ed"

echo "$differ - original: $infile vs. autopep8ed: $ap8ed"
"$differ" "$infile" "$ap8ed"

rm "$ap8ed"