#!/bin/sh
# Run a command, and watch for changes in its output.

dir="$HOME/.watch-command"
mkdir -p "$dir"

hash="`printf '%s' "$@" | md5sum | awk '{print substr($1, 1, 8)}'`"
ref="$dir/command-$hash.ref"
new="$dir/command-$hash.new"
"$@" >"$new" 2>&1
touch "$ref"
if diff -u "$ref" "$new" ; then
	rm -f "$new"
else
	printf '\nTo accept changes:\nmv %s %s\n' "$new" "$ref"
fi