git/CheckPush

#!/bin/sh

for range in $(
	prev_branch=
	{
		git for-each-ref --format='%(refname)' refs/heads/maint-* |
		sed -e 's|^refs/heads/||'
		cat <<-EOF
		maint
		master
		next
		EOF
	} |
	while read branch
	do
		if test -n "$prev_branch"
		then
			echo "$branch..$prev_branch"
		fi
		prev_branch=$branch
	done
) pu..jch
do
	lg=$(git log --oneline "$range")
	if test -n "$lg"
	then
		echo "*** $range ***"
		echo "$lg"
	fi
done

if	next_tree=$(git rev-parse next^{tree}) &&
	next_equiv=$(git rev-list jch..pu |
		xargs -n1 sh -c '
			echo $(git rev-parse $1^{tree}) $1
		' - | sed -n -e "s/^$next_tree //p"
	) &&
	test -n "$next_equiv"
then
	jch=$(git rev-list --first-parent master..jch | wc -l) &&
	pu=$(git rev-list --first-parent master..pu | wc -l) &&
	next=$(git rev-list --first-parent master..$next_equiv | wc -l) &&
	echo $jch..$next..$pu
else
	git diff --stat next jch
fi