git_leapfrog.sh

#!/bin/bash

# Function to display help
display_help() {
    echo "Usage: $0 [option...] " >&2
    echo
    echo "   -s <YYYY-MM-DD>,        Specify the start date"
    echo "   -u <YYYY-MM-DD>,        Specify the end date"
    echo "   -b <branch_name>,       Specify the branch name"
    echo "   -n,<branch_name>,       Disable color output"
    echo "   -h,                     Display this help and exit"
    echo
    exit 1
}

# Calculate default dates
default_since_date=$(date -d "1 week ago" +%Y-%m-%d)
default_until_date=$(date +%Y-%m-%d)
default_branch_name="main"
no_color=false

# Parse command line arguments
while getopts s:u:b:nch option; do
    case "${option}" in
    s) since_date=${OPTARG} ;;
    u) until_date=${OPTARG} ;;
    b) branch_name=${OPTARG} ;;
    n) no_color=true ;;
    h) display_help ;;
    *) display_help ;;
    esac
done

# If no arguments are provided, use the interactive mode
if [ -z "$since_date" ] && [ -z "$until_date" ] && [ -z "$branch_name" ]; then
    # Prompt for the "since" date with default as one week ago
    read -p "Since  [$default_since_date]: " since_date
    since_date=${since_date:-$default_since_date}

    # Prompt for the "until" date with default as today
    read -p "Until  [$default_until_date]: " until_date
    until_date=${until_date:-$default_until_date}

    # Prompt for the branch name with default as "main"
    read -p "Branch [main]: " branch_name
    branch_name=${branch_name:-main}
else
    # If arguments are provided, use them
    since_date=${since_date:-$default_since_date}
    until_date=${until_date:-$default_until_date}
    branch_name=${branch_name:-$default_branch_name}
fi

# Calculate the number of days between since_date and until_date
days=$((($(date -d "$until_date" +%s) - $(date -d "$since_date" +%s)) / 86400 + 1))

# Check for valid days calculation
if [ "$days" -le 0 ]; then
    echo "Error: 'until_date' must be after 'since_date'."
    exit 1
fi

# Execute git log command with the provided or default parameters
git log --since="$since_date" --until="$until_date" --branches="$branch_name" --oneline --numstat "$branch_name" |
    awk -v days="$days" -v no_color="$no_color" '$1 ~ /^[0-9]+$/ && $2 ~ /^[0-9]+$/ {
    added+=$1
    deleted+=$2
} END {
    if (no_color == "true") {
        print "\nFrom " "'"$since_date"'" " to " "'"$until_date"'" " (" days " days)\n"
        print "Added lines:   " added
        print "Deleted lines: " deleted "\n"
        if (days > 0) {
            print "Average lines changed per day: " (added+deleted)/days
        }
        print "\n summarized by Git Leapfrog"
    } else {
        print "\nFrom " "'"$since_date"'" " to " "'"$until_date"'" " (" days " days)\n"
        print "🟢 Added lines:   " added
        print "🔴 Deleted lines: " deleted "\n"
        if (days > 0) {
            print "🚀 Average lines changed per day: " (added+deleted)/days
        }
        print "\n summarized by 🐸 Git Leapfrog"
    }
}'