Count indent levels and echo lines that are indented over a given limit

depth.sh

#!/usr/bin/env bash

# Read lines from stdin and echo them if the indent is too deep
#
# @param 1 - levels of indent to consider too much (optional)
# @param 2 - indent character (optional)
check_indents()
{
	local THRESHOLD=${1:-3}
	local INDENT=${2:-$'\t'}
	local LINE=0
	local HITS=0

	while read -r
	do
		local COUNT=0

		while [[ $REPLY == $INDENT* ]]
		do
			REPLY=${REPLY:1}
			(( ++COUNT ))
		done

		if (( COUNT > THRESHOLD ))
		then
			printf "% 4d (%dx) %s\n" $LINE $COUNT "$REPLY"
			(( ++HITS ))
		fi

		(( ++LINE ))
	done

	return $HITS
}

if [ "${BASH_SOURCE[0]}" == "$0" ]
then
	check_indents "$@"
fi