context3.sh

#!/bin/bash

function usage
{
    echo "Usage $0 <file name> <line> <context>"
    exit 1
}

code_file=$1
lineno=$2
context=$3


if [ "$lineno" = "" ] ; then
    usage
fi

if [ "$context" = "" ] ; then
    context=6
fi

if [ "$context" -lt "4" ] ; then
   context=4
fi

if [ $(($context % 2 )) != "0" ] ; then
        context=$(($context + 1))
fi

start_line=$(($lineno - ($context / 2)))
end_line=$(($lineno + ($context / 2)))

cat -n $code_file | tail -n +$start_line | head -n $(($context + 1))

echo
echo ---
echo

hash=$(git blame $code_file -L $lineno,$lineno |cut -d " " -f 1)
git --no-pager show $hash $code_file