bats-preprocess

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

bats_encode_test_name() {
  local name="$1"
  local result='test_'
  local hex_code

  if [[ ! "$name" =~ [^[:alnum:]\ _-] ]]; then
    name="${name//_/-5f}"
    name="${name//-/-2d}"
    name="${name// /_}"
    result+="$name"
  else
    local length="${#name}"
    local char i

    for ((i = 0; i < length; i++)); do
      char="${name:$i:1}"
      if [[ "$char" == ' ' ]]; then
        result+='_'
      elif [[ "$char" =~ [[:alnum:]] ]]; then
        result+="$char"
      else
        printf -v 'hex_code' -- '-%02x' \'"$char"
        result+="$hex_code"
      fi
    done
  fi

  printf -v "$2" '%s' "$result"
}

BATS_TEST_PATTERN="^[[:blank:]]*@test[[:blank:]]+(.*[^[:blank:]])[[:blank:]]+\{(.*)\$"
BATS_TEST_PATTERN_COMMENT="[[:blank:]]*([^[:blank:]()]+)[[:blank:]]*\(?\)?[[:blank:]]+\{[[:blank:]]+#[[:blank:]]*@test[[:blank:]]*\$"

test_file="$1"
tests=()
{
  while IFS= read -r line; do
    line="${line//$'\r'/}"
    if [[ "$line" =~ $BATS_TEST_PATTERN ]] || [[ "$line" =~ $BATS_TEST_PATTERN_COMMENT ]]; then
      name="${BASH_REMATCH[1]#[\'\"]}"
      name="${name%[\'\"]}"
      body="${BASH_REMATCH[2]:-}"
      bats_encode_test_name "$name" 'encoded_name'
      printf '%s() { bats_test_begin "%s"; %s\n' "${encoded_name:?}" "$name" "$body" || :

      if [[ -z "$BATS_TEST_FILTER" || "$name" =~ $BATS_TEST_FILTER ]]; then
        tests+=("$encoded_name")
      fi
    else
      printf '%s\n' "$line"
    fi
  done
} <<<"$(<"$test_file")"$'\n'

for test_name in "${tests[@]}"; do
  printf 'bats_test_function %s\n' "$test_name"
done