check if there are new todos about to be committed

newtodos.sh

#!/usr/bin/env bash

git diff -S 'TODO' HEAD | \
grep -i '^+++\|^@@' | \
sed -E 's/\+{3} b\///' | \
sed -E 's/^@@ -[0-9]+,([0-9]+) \+[0-9]+,([0-9]+) @@$/\1 \2/' | \
awk '
	{
		# NR starts at 1
		if (NR % 2 == 1) {
			fname = $1;
		}

		if (NR % 2 == 0) {
			start = $1
			end = $2
			cmd = "grep TODO -ni "fname
			while ( ( cmd | getline line ) > 0 ) {
				split(line, fields, ":")
				if (start <= fields[1] && fields[1] <= end) {
					sub("^[ \t]*", "", fields[2])
					gsub("\t", " ", fields[2])
					print fname ":"fields[1] "\t" fields[2]
				}
			}
			close(cmd)
		}
	}
' | \
column -t -s $'\t'