glchng

#!/bin/sh

if [ -z `git rev-parse --is-inside-work-tree 2>/dev/null` ]; then
	echo "${PWD} isn't git repo dir"
	exit 1
fi

if [ $# -lt 1 ]; then
	echo "bad ussage: 1.arg is name of file"
	echo "nonmandatory 2.arg = num of last commits to see"
	exit 1
fi

if [ ! -f "$1" ]; then
	echo "file $1 doesn't exist"
	exit 1
fi

N=2 # default see changes between last 2 commits
[ $# -eq 2 ] && ((N=$2+1))

START=""
END=""
for i in $(git log -n $N --pretty=oneline $1 | awk '{print $1}')
do
	[ -z $START ] && START=$i || END=$i
done

if [ -z "$START" -o -z "$END" ]; then
	echo "no changes on $1"
	exit 0
fi

git diff $START..$END $1 | vim -