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#! /bin/bash -e

buildbot_step_help() {
  echo "Run a command and wrap it in buildbot step format"
  echo "  $0 - <buildbot step> [bash args...]"
}

bb_time() {
  # Parser dies if this is longer then 6 chars long.
  nano=$(date +%N | cut -c1-6)
  echo "$(date '+%Y-%m-%d %H:%M:%S.')$nano"
}

bb_echo() {
  echo "========= $1 ========="
}

bb_line() {
  local type=$1 # Finished/Started
  local step=$2 # Name of step
  local code=$3 # Exit code
  local duration=$4 # Elapsed time in seconds
  local time=$(bb_time)

  bb_echo "$type $step (results: $code, elapsed: $duration secs) (at $time)"
}

# Intentionally the full name of this executable so sourcing this file also
# works as expected...
buildbot_step() {
  local step=$1
  local command=${@:2}
  local start_time=$(date +%s)
  local exit_code=0

  bb_line "Started" "$step" 0 0
  if eval "$command";
  then
    exit_code=$?
  else
    exit_code=$?
  fi

  local end_time=$(date +%s)
  local duration=$(($end_time-$start_time))

  bb_line "Finished" "$step" $exit_code $duration
  return $exit_code
}


# When this script is not being sourced invoke command directly.
if [ "$(basename $0)" == "buildbot_step" ];
then
  if [ $# -lt 2 ];
  then
    buildbot_step_help
    exit 1
  fi
  buildbot_step "$@"
  exit $?
fi