Calculate daily progress in lines of code from git repo and generate csv file.

progress.sh

#!/bin/bash

DATE=gdate

set -euo pipefail

if [[ "${1:-}" == "" || "${2:-}" == "" ]]; then
    echo "Usage: $0 <start date> <directory with source> [optional cloc args]"
    exit 1
fi

TIME=$($DATE -d "$1" +%s)
DIR=$2
NOW=$($DATE +%s)
DAY=86400

PREV_STATS=""
while [[ $TIME < $NOW ]]; do
    git checkout $(git rev-list -n 1 --before=$TIME --all) 2>/dev/null >/dev/null
    STATS=$(cloc $DIR --json ${@:3} | jq -r '[.SUM.blank,.SUM.comment,.SUM.code,.SUM.nFiles]|map(tostring)|join(",")')
    if [[ $STATS != $PREV_STATS ]]; then
        echo "$($DATE -d @$TIME +%D),$STATS"
        PREV_STATS=$STATS
    fi
    TIME=$(($TIME + $DAY))
done