Parse git log stats and give an overview of daily repo changes

gitchanges.sh

#!/bin/bash

OPT=""
AUTHOR=""

for i in "$@"; do
    case $i in
    -a|--all)
        OPT+="--all"
        OPT+=" "
        shift;;
    -A=*|--author=*)
        AUTHOR=${i#*=}
        AUTHOR=--author=$AUTHOR
        shift;;
    esac
done

git log $OPT $AUTHOR --stat \
| grep "file changed\|files changed\|Date" \
| awk '

# Record the date of a new commit
$1 ~ /Date\:/ {
    date = ($2 " " $3 " " $4);
    commits[date] += 1;
}

# Record the insertions and deletions in the commit
/files changed/ || /file changed/ {
    if ($5 ~ /insertions/) {
        inserts[date] += $4;
    }
    if ($5 ~ /deletions/) {
        deletes[date] += $4;
    }
    if ($7 ~ /deletions/) {
        deletes[date] += $6;
    }
}

# Print out the summary
END {
    for (i in commits){
        printf "%-11s: %2i commits, %6i inserts(+), %6i deletes(-), %6i net\n", i, commits[i], inserts[i], deletes[i], inserts[i] - deletes[i];
    }
}' \
| sort -k2Mr -k3gr