#!/usr/bin/env bash
## Shows what authors have made the most commits, both by number of commits and by number of lines changed.
## Source: git-extra-commands

# Copyright © 2008 Garry C. Dolley
# https://github.com/up_the_irons/git-winner

function usage() {
  echo "git-winner by Garry Dolley (http://scie.nti.st)"
  echo ""
  echo "Usage: $0 [date]"
  exit
}

case $1 in
  -h) usage;;
  --help) usage;;
esac

if [ -n "$1" ]; then
  DATE=$1
else
  DATE=01-01-1970
fi

PLAYERS=$(git shortlog --all --after=$DATE | grep '^\w' | sed 's/\(.*\) ([0-9]*):/\1/')

HIGHEST_COMMIT_COUNT=0
HIGHEST_COMMIT_LINES=0

echo "Activity after $DATE"
echo ""

if [ -z "$PLAYERS" ]; then
  echo "No players!"
  echo ""
  echo "Appears there have been no commits after $DATE.  Try an earlier date."
  exit
fi

IFS='
'

for player in $PLAYERS; do
  COMMIT_COUNT=$(git shortlog --all --after=$DATE --author="$player" | grep ^"$player (" | sed "s/$player (\(.*\)):/\1/")
  COMMIT_LINES=$(git log      --all --after=$DATE --author="$player" --pretty=format: --stat | grep '[0-9]* files changed, [0-9]* insertions.*, [0-9]* deletions' | awk '{ sum += $4 + $6} END { print sum }')

  if [ -z "$COMMIT_COUNT" ]; then
    COMMIT_COUNT=0
  fi

  if [ -z "$COMMIT_LINES" ]; then
    COMMIT_LINES=0
  fi

  if [ "$COMMIT_COUNT" -gt "$HIGHEST_COMMIT_COUNT" ]; then
    HIGHEST_COMMIT_COUNT=$COMMIT_COUNT
    HIGHEST_COMMIT_COUNT_PLAYER=$player
  fi

  if [ "$COMMIT_LINES" -gt "$HIGHEST_COMMIT_LINES" ]; then
    HIGHEST_COMMIT_LINES=$COMMIT_LINES
    HIGHEST_COMMIT_LINES_PLAYER=$player
  fi

  echo "Results for $player:"
  echo "  # of commits        : $COMMIT_COUNT"
  echo "  # of lines committed: $COMMIT_LINES"
done

if [ "$HIGHEST_COMMIT_COUNT" -gt 0 ]; then
  echo ""
  echo "$HIGHEST_COMMIT_COUNT_PLAYER wins in commit count with $HIGHEST_COMMIT_COUNT commits!"
  echo "$HIGHEST_COMMIT_LINES_PLAYER wins in number of lines commited with $HIGHEST_COMMIT_LINES lines!"

  if [ "$HIGHEST_COMMIT_COUNT_PLAYER" = "$HIGHEST_COMMIT_LINES_PLAYER" ]; then
    FIRST_NAME=$(echo "$HIGHEST_COMMIT_COUNT_PLAYER" | awk '{ print $1 }')

    echo ""
    echo "$FIRST_NAME is the overall winner!!"
  fi
fi