#!/usr/bin/env bash
set -e
set -E
set -T

BATS_COUNT_ONLY=""
if [ "$1" = "-c" ]; then
  BATS_COUNT_ONLY=1
  shift
fi

BATS_EXTENDED_SYNTAX=""
if [ "$1" = "-x" ]; then
  BATS_EXTENDED_SYNTAX="$1"
  shift
fi

BATS_TEST_FILENAME="$1"
if [ -z "$BATS_TEST_FILENAME" ]; then
  echo "usage: bats-exec <filename>" >&2
  exit 1
elif [ ! -f "$BATS_TEST_FILENAME" ]; then
  echo "bats: $BATS_TEST_FILENAME does not exist" >&2
  exit 1
else
  shift
fi

BATS_TEST_DIRNAME="$(dirname "$BATS_TEST_FILENAME")"
BATS_TEST_NAMES=()

load() {
  local filename="$BATS_TEST_DIRNAME/$1.bash"
  [ -f "$filename" ] || {
    echo "bats: $filename does not exist" >&2
    exit 1
  }

  source "$BATS_TEST_DIRNAME/$1.bash"
}

run() {
  local e E T
  [[ ! "$-" =~ e ]] || e=1
  [[ ! "$-" =~ E ]] || E=1
  [[ ! "$-" =~ T ]] || T=1
  set +e
  set +E
  set +T
  output="$("$@" 2>&1)"
  status="$?"
  IFS=$'\n' lines=($output)
  [ -z "$e" ] || set -e
  [ -z "$E" ] || set -E
  [ -z "$T" ] || set -T
}

# code for storing stdout and stderr separately
# is taken from http://stackoverflow.com/a/18086548
# (question http://stackoverflow.com/questions/11027679/bash-store-stdout-and-stderr-in-different-variables)
run_outerr() {
  local e E T
  [[ ! "$-" =~ e ]] || e=1
  [[ ! "$-" =~ E ]] || E=1
  [[ ! "$-" =~ T ]] || T=1
  set +e
  set +E
  set +T

  local tmp_out tmp_err tmp_status
  eval "$(
    "$@" \
      2> >(tmp_err="$(cat)" ; declare -p tmp_err) \
      1> >(tmp_out="$(cat)" ; declare -p tmp_out)
    tmp_status="$?"
    declare -p tmp_status
  )"

  output="${tmp_out}"
  error="${tmp_err}"
  status="${tmp_status}"

  IFS=$'\n' lines_out=($output)
  IFS=$'\n' lines_err=($error)
  [ -z "$e" ] || set -e
  [ -z "$E" ] || set -E
  [ -z "$T" ] || set -T
}

setup() {
  true
}

teardown() {
  true
}

skip() {
  BATS_TEST_SKIPPED=${1:-1}
  BATS_TEST_COMPLETED=1
  exit 0
}

bats_test_begin() {
  BATS_TEST_DESCRIPTION="$1"
  if [ -n "$BATS_EXTENDED_SYNTAX" ]; then
    echo "begin $BATS_TEST_NUMBER $BATS_TEST_DESCRIPTION" >&3
  fi
  setup
}

bats_test_function() {
  local test_name="$1"
  BATS_TEST_NAMES["${#BATS_TEST_NAMES[@]}"]="$test_name"
}

bats_capture_stack_trace() {
  if [ "$BASH_SOURCE" != "$1" ]; then
    BATS_STACK_TRACE=()
    BATS_LINE_NUMBER="$BATS_LINE_NUMBER_"
    BATS_LINE_NUMBER_="$2"

    local test_pattern=" $BATS_TEST_NAME $BATS_TEST_SOURCE"
    local setup_pattern=" setup $BATS_TEST_SOURCE"
    local teardown_pattern=" teardown $BATS_TEST_SOURCE"

    local index=0
    local frame

    while frame="$(caller "$index")"; do
      BATS_STACK_TRACE[$index]="$frame"
      if [[ "$frame" = *"$test_pattern"     || \
            "$frame" = *"$setup_pattern"    || \
            "$frame" = *"$teardown_pattern" ]]; then
        break
      else
        let index+=1
      fi
    done
  fi
}

bats_print_stack_trace() {
  local index=1
  local count="${#BATS_STACK_TRACE[@]}"
  local line

  for frame in "${BATS_STACK_TRACE[@]}"; do
    if [ $index -eq 1 ]; then
      line="$BATS_LINE_NUMBER"
      echo -n "# ("
    else
      line="$(bats_frame_line "$frame")"
      echo -n "#  "
    fi

    local fn="$(bats_frame_function "$frame")"
    if [ "$fn" != "$BATS_TEST_NAME" ]; then
      echo -n "from function \`$fn' "
    fi

    if [ $index -eq $count ]; then
      echo "in test file $BATS_TEST_FILENAME, line $line)"
    else
      local filename="$(bats_frame_filename "$frame")"
      echo "in file $filename, line $line,"
    fi

    let index+=1
  done
}

bats_frame_line() {
  local frame="$1"
  local line="${frame%% *}"
  echo "$line"
}

bats_frame_function() {
  local frame="$1"
  local rest="${frame#* }"
  local fn="${rest%% *}"
  echo "$fn"
}

bats_frame_filename() {
  local frame="$1"
  local rest="${frame#* }"
  local filename="${rest#* }"

  if [ "$filename" = "$BATS_TEST_SOURCE" ]; then
    echo "$BATS_TEST_FILENAME"
  else
    echo "$filename"
  fi
}

bats_error_trap() {
  trap - debug
}

bats_teardown_trap() {
  trap bats_exit_trap exit
  if teardown >>"$BATS_OUT" 2>&1; then
    BATS_TEARDOWN_COMPLETED=1
  elif [ -n "$BATS_TEST_COMPLETED" ]; then
    BATS_LINE_NUMBER="$BATS_LINE_NUMBER_"
  fi
  bats_exit_trap
}

bats_exit_trap() {
  local status
  local skipped
  trap - err exit

  skipped=""
  if [ -n "$BATS_TEST_SKIPPED" ]; then
    skipped=" # skip"
    if [ "1" != "$BATS_TEST_SKIPPED" ]; then
      skipped+=" ($BATS_TEST_SKIPPED)"
    fi
  fi

  if [ -z "$BATS_TEST_COMPLETED" ] || [ -z "$BATS_TEARDOWN_COMPLETED" ]; then
    echo "not ok $BATS_TEST_NUMBER $BATS_TEST_DESCRIPTION" >&3
    bats_print_stack_trace >&3
    sed -e "s/^/# /" < "$BATS_OUT" >&3
    status=1
  else
    echo "ok ${BATS_TEST_NUMBER}${skipped} ${BATS_TEST_DESCRIPTION}" >&3
    status=0
  fi

  rm -f "$BATS_OUT"
  exit "$status"
}

bats_perform_tests() {
  echo "1..$#"
  test_number=1
  status=0
  for test_name in "$@"; do
    "$0" $BATS_EXTENDED_SYNTAX "$BATS_TEST_FILENAME" "$test_name" "$test_number" || status=1
    let test_number+=1
  done
  exit "$status"
}

bats_perform_test() {
  BATS_TEST_NAME="$1"
  if [ "$(type -t "$BATS_TEST_NAME" || true)" = "function" ]; then
    BATS_TEST_NUMBER="$2"
    if [ -z "$BATS_TEST_NUMBER" ]; then
      echo "1..1"
      BATS_TEST_NUMBER="1"
    fi

    BATS_TEST_COMPLETED=""
    BATS_TEARDOWN_COMPLETED=""
    trap "bats_capture_stack_trace \"\$BASH_SOURCE\" \$LINENO" debug
    trap "bats_error_trap" err
    trap "bats_teardown_trap" exit
    "$BATS_TEST_NAME" >>"$BATS_OUT" 2>&1
    BATS_TEST_COMPLETED=1

  else
    echo "bats: unknown test name \`$BATS_TEST_NAME'" >&2
    exit 1
  fi
}

if [ -z "$TMPDIR" ]; then
  BATS_TMPDIR="/tmp"
else
  BATS_TMPDIR="${TMPDIR%/}"
fi

BATS_TMPNAME="$BATS_TMPDIR/bats.$$"
BATS_PARENT_TMPNAME="$BATS_TMPDIR/bats.$PPID"
BATS_OUT="${BATS_TMPNAME}.out"

bats_preprocess_source() {
  BATS_TEST_SOURCE="${BATS_TMPNAME}.src"
  { tr -d '\r' < "$BATS_TEST_FILENAME"; echo; } | bats-preprocess > "$BATS_TEST_SOURCE"
  trap bats_cleanup_preprocessed_source err exit
  trap "bats_cleanup_preprocessed_source; exit 1" int
}

bats_cleanup_preprocessed_source() {
  rm -f "$BATS_TEST_SOURCE"
}

bats_evaluate_preprocessed_source() {
  if [ -z "$BATS_TEST_SOURCE" ]; then
    BATS_TEST_SOURCE="${BATS_PARENT_TMPNAME}.src"
  fi
  source "$BATS_TEST_SOURCE"
}

exec 3<&1

if [ "$#" -eq 0 ]; then
  bats_preprocess_source
  bats_evaluate_preprocessed_source

  if [ -n "$BATS_COUNT_ONLY" ]; then
    echo "${#BATS_TEST_NAMES[@]}"
  else
    bats_perform_tests "${BATS_TEST_NAMES[@]}"
  fi
else
  bats_evaluate_preprocessed_source
  bats_perform_test "$@"
fi