#!/bin/bash -e
# interactive diff with pagination and nice coloring
declare -a files
while test $# -gt 0
do	test "$1" == "--" && shift &&
		command="$@" && break
	files+=("$1")
	shift
done
{
if ! test "$command"; then
	mime="$(file --brief --mime "${files[@]}")"
	case "$mime" in
	(*audio*) command="ffprobe -loglevel warning -print_format default=noprint_wrappers=1 -show_format -pretty";;
	(image/*) command="exiftool";;
	(*sqlite*) sqldiff --summary "${files[@]}" | grep -v '0 changes, 0 inserts, 0 deletes';; # TODO syntax highlighting for INSERT/UPDATE/DELETE
	(text/*)
		# Use wiked-diff only for text <100KB
		test 100000 -gt "$(stat --format=%s "${files[@]}" | paste -s -d'+' | bc)" &&
			wiked-diff "${files[@]}" ||
				diff --color=always --unified=1 --report-identical-files "${files[@]}"
		;;
	(*) diff-color --report-identical-files "${files[@]}";;
	esac
fi
if test "$command"; then
	echo "Generated through $command"
	$(test $(tput cols) -gt 120 && echo "diff --color=always --side-by-side" || echo "diff-color") \
		--ignore-case --report-identical-files --label="${files[0]}" --label="${files[1]}" <($command "${files[0]}") <($command "${files[1]}")
fi
} | less --RAW-CONTROL-CHARS --quit-on-intr --quit-if-one-screen