#!/bin/bash

# Specify a directory with all Git repositories
REPODIR=~/Git

# Regex or fixed name (brackets need to be escaped with a backslash)
REPOUSER="\(structix\|Janek\)"

# Specify the start date, where the statistics should be gathered
STARTDATE="01 Jan 2018"

# --------------------

# Switch into the REPODIR
pushd $REPODIR

commitcounter=0

# Iterate over all subdirectories
for dir in $REPODIR/*/
do
    dir=${dir%*/}
    echo ${dir##*/}

    # enter directory
    cd ${dir##*/}

    # show amount of commits of all users
    committemp=$(git rev-list --count --all --author=$REPOUSER --since="$STARTDATE")

    commitcounter=$((commitcounter + committemp))

    echo $committemp

    # go back
    cd ..
done

echo "Total commits since $STARTDATE: $commitcounter"

# Switch back to the original directory state
popd