diff + bat

bdiff.sh

#!/bin/bash
diff -Naur "$@" | bat -p -l diff

diff2c.sh

#!/bin/bash
# diff running 2 different commands on the same file
set -e
if [ "$#" -lt 3 ]; then
  echo 'usage: diff2c CMD_A CMD_B FILE' >&2
  exit 1
fi
cmd_a="$1" cmd_b="$2" file="$3"
diff -Naur <( $cmd_a "$file" ) <( $cmd_b "$file" ) | bat -p -l diff

diff2f.sh

#!/bin/bash
# diff running the same command on 2 different files
set -e
if [ "$#" -lt 3 ]; then
  echo 'usage: diff2f CMD FILE_A FILE_B' >&2
  exit 1
fi
cmd="$1" file_a="$2" file_b="$3"
diff -Naur <( $cmd "$file_a" ) <( $cmd "$file_b" ) | bat -p -l diff