#!/bin/bash
#
# Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of Hyra nor the names of its contributors may be used
#    to endorse or promote products derived from this software without
#    specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

#
# Description:
#       Lists contributors and the amount of lines
#       added/deleted by them.
#
# Author: Ian Marco Moffett
#

# Returns the input with a removed substring.
# $1 -> Substring to remove.
filter() {
    while read line
    do
        echo $line | awk "{ if (/$1/ && !yes) { yes = 1 } else print }"
    done
}

# Logs the stat of a user.
# $1 -> Username of user to fetch.
logstats() {
    while read line
    do
        author=$(cut -d' ' -f1 <<< "$line")
        stats=$(git log --author="$author" --pretty=tformat: --numstat |
            awk '{ added += $1; removed += $2 } END { print added, removed }')

        added=$(echo $stats | awk '{print $1}')
        removed=$(echo $stats | awk '{print $2}')
        sum=$((${added:-0}+ ${removed:-0}))

        # If nothing changed, default to 0
        added=${added:-0}
        removed=${removed:-0}
        printf "%s %s [%s++/%s--]\n" "$sum" "$line" "$added" "$removed"
    done
}

# Fetch the contributors and stats
echo "Fetching contributors..."
logfile=$(mktemp)
git shortlog --summary --numbered --email | cut -c 7- | awk '{$1=$1;print}' | \
    filter 'ian <ian>' | filter 'emilia' | sort -u | logstats &>$logfile

echo "----------------------------------"
sort -nr $logfile | cut -d' ' -f2-
echo "----------------------------------"