#!/usr/bin/env bash
# reset environment variables that could interfere with normal usage
unset -v GREP_OPTIONS
# put all utility functions here

# make a temporary file
git_extra_mktemp() {
    mktemp -t "$(basename "$0")".XXXXXXX
}

git_extra_default_branch() {
    local extras_default_branch init_default_branch
    extras_default_branch=$(git config --get git-extras.default-branch)
    init_default_branch=$(git config --get init.defaultBranch)
    if [ -n "$extras_default_branch" ]; then
        echo "$extras_default_branch"
    elif [ -n "$init_default_branch" ]; then
        echo "$init_default_branch"
    else
        echo "main"
    fi
}
#
# check whether current directory is inside a git repository
#

is_git_repo() {
  git rev-parse --show-toplevel > /dev/null 2>&1
  result=$?
  if test $result != 0; then
    >&2 echo 'Not a git repo!'
    exit $result
  fi
}

is_git_repo
#
# check whether current directory contains any git commit
#

has_git_commit() {
  git rev-parse --short HEAD > /dev/null 2>&1
  result=$?
  if test $result != 0; then
    >&2 echo 'Not git commit found!'
    exit $result
  fi
}

has_git_commit

LIST=false
NO_EMAIL=false
FILE=""

while [[ $# -gt 0 ]]; do
  case $1 in
    -l|--list )
      LIST=true
      shift
      ;;
    --no-email )
      NO_EMAIL=true
      shift
      ;;
    * )
      break
  esac
done

if ! $LIST; then
  FILE=$1
  if [ -z "$FILE" ]; then
    FILE=$(find . -mindepth 1 -maxdepth 1 \( -iname '*authors*' -o -iname '*contributors*' \) | head -n1)
    if [ -z "$FILE" ]; then
      FILE='AUTHORS'
    fi
  fi
fi

#
# list authors sorted by number of commits (descending).
#

authors() {
  if $NO_EMAIL; then
    # email will be used to uniq authors.
    git shortlog HEAD -sne | awk '{$1=""; sub(" ", ""); print}' | awk -F'<' '!x[$1]++' | awk -F'<' '!x[$2]++' \
      | awk -F'<' '{gsub(/ +$/, "", $1); print $1}'
  else
    git shortlog HEAD -sne | awk '{$1=""; sub(" ", ""); print}' | awk -F'<' '!x[$1]++' | awk -F'<' '!x[$2]++'
  fi
}

#
# authors.
#

if $LIST; then
  authors
else
  authors >> "$FILE"
fi
