Character count csv of folder in git

git-char-log.sh

#!/bin/bash

for commit in $(git rev-list --reverse --topo-order HEAD -- .)
do
    sum=0
    for file in $(git ls-tree -r --name-only $commit)
    do
        if [[ $(git show $commit:./$file | file -ib -) =~ "text/" ]]
        then
            count=$(git show $commit:./$file | tr -d '[:space:]' | wc -c)
            sum=$((sum + count))
        fi
    done
    meta=$(git log -n1 --format="format:%cI,%h,%an" $commit)
    title=$(git log -n1 --format="format:%s" $commit | tr -d \")
    echo "$sum,$meta,\"$title\""
done