git-stats

#!/usr/bin/env bash
if [ $# -ge 1 ];then
    datestr=$1
else
    datestr="lastweek";
fi;

if [ $# -ge 2 ];then
    path=$2
else
    path="";
fi;

if [ $datestr = "--help" ] || [ $datestr = "?" ] ;then
echo 'git stats [[-][number]|all|lastweek  lastweek]  [path  .]';
exit;
fi;
sinceday=""
beforeday=""
valid=false
isNumber=`grep '^[-[:digit:]]*$' <<< "$datestr"`
if [ "$(uname)" == "Darwin" ]; then
    if [ $datestr = "lastweek" ];then
        beforeday="--before="`date -v -sat "+%Y-%m-%d"`
        startTime=$[`date -v -sat "+%s"`- 7*86400]
        sinceday="--since="`date -r $startTime "+%Y-%m-%d"`
        valid=true
    fi;
    if [ "$isNumber" != "" ];then
        valid=true
        if [ "$datestr" -gt 0 ];then
            sinceday="--since="`date -v -${datestr#-}d "+%Y-%m-%d"`
        else
            beforeday="--before="`date -v -${datestr#-}d "+%Y-%m-%d"`
        fi;
    fi;
elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
    if [ $datestr = "lastweek" ];then
        beforeday="--before="`date -d "last Saturday" "+%Y-%m-%d"`
        startTime=$[`date -d  "last Saturday" "+%s"`- 7*86400]
        sinceday="--since="`date -d @$startTime "+%Y-%m-%d"`
    fi;
    if [ "$isNumber" != "" ];then
        if [ "$datestr" -gt 0 ];then
            sinceday="--since="`date -d "-${datestr#-} days" "+%Y-%m-%d"`
        else
            beforeday="--before="`date -d "-${datestr#-} days" "+%Y-%m-%d"`
        fi;
    fi;
fi
if [ $datestr = "all" ];then
    beforeday="";
    sinceday="";
fi;
Authors=`git shortlog -sne | awk '{print $2}'`
if [ "$sinceday" != "" ] || [ "$beforeday" != "" ]; then
    echo  -e  "\033[32mget stas " $sinceday $beforeday  "\033[0m";
fi;
for author in ${Authors}
do
   git log --author=$author --pretty=tformat: --numstat $sinceday $beforeday $path | awk '{ add += $1 ; subs += $2 ; loc += $1 + $2 } END { printf "'$author'  %s+  %s- total lines: %s\n",add,subs,loc }'
done