#!/bin/sh

set -eu

usage () {
  echo "Usage: $0 [OPTION]..."
  echo "Run Neutron's coding check(s)"
  echo ""
  echo "  -Y, --pylint [<basecommit>] Run pylint check on the entire neutron module or just files changed in basecommit (e.g. HEAD~1)"
  echo "  -h, --help                  Print this usage message"
  echo
  exit 0
}

process_options () {
  i=1
  while [ $i -le $# ]; do
    eval opt=\$$i
    case $opt in
      -h|--help) usage;;
      -Y|--pylint) pylint=1;;
      *) scriptargs="$scriptargs $opt"
    esac
    i=$((i+1))
  done
}

run_pylint () {
    local target="${scriptargs:-all}"

    if [ "$target" = "all" ]; then
        files="neutron"
    else
      case "$target" in
        *HEAD~[0-9]*) files=$(git diff --diff-filter=AM --name-only $target -- "*.py");;
        *) echo "$target is an unrecognized basecommit"; exit 1;;
      esac
    fi

    echo "Running pylint..."
    echo "You can speed this up by running it on 'HEAD~[0-9]' (e.g. HEAD~1, this change only)..."
    if [ -n "${files}" ]; then
        pylint --rcfile=.pylintrc --output-format=colorized ${files}
    else
        echo "No python changes in this commit, pylint check not required."
        exit 0
    fi
}

scriptargs=
pylint=1

process_options $@

if [ $pylint -eq 1 ]; then
    run_pylint
    exit 0
fi
