#!/bin/bash

set -e

echo_err() { echo "$@" 1>&2 ; }

if [[ "$TRAVIS" != "true" ]] ; then
  echo_err "Running this script makes no sense outside of travis-ci"
  exit 1
fi

tstamp() { echo -n "[$(date '+%H:%M:%S')]" ; }

run_or_err() {
  echo_err -n "$(tstamp) $1 ... "

  LASTEXIT=0
  START_TIME=$SECONDS
  LASTOUT=$( bash -c "$2" 2>&1 ) || LASTEXIT=$?
  DELTA_TIME=$(( $SECONDS - $START_TIME ))

  if [[ "$LASTEXIT" != "0" ]] ; then
    echo_err -e "FAILED !!! (after ${DELTA_TIME}s)\nCommand executed:\n$2\nSTDOUT+STDERR:\n$LASTOUT"
    return $LASTEXIT
  else
    echo_err "done (took ${DELTA_TIME}s)"
  fi
}

extract_prereqs() {
  # once --verbose is set, --no-verbose can't disable it
  # do this by hand
  ORIG_CPANM_OPT="$PERL_CPANM_OPT"
  PERL_CPANM_OPT="$( echo $PERL_CPANM_OPT | sed 's/--verbose//' )"

  # hack-hack-hack
  LASTEXIT=0
  COMBINED_OUT="$( { stdout="$(cpanm --quiet --scandeps --format tree "$@")" ; } 2>&1; echo "!!!STDERRSTDOUTSEPARATOR!!!$stdout")" \
    || LASTEXIT=$?

  PERL_CPANM_OPT="$ORIG_CPANM_OPT"

  OUT=${COMBINED_OUT#*!!!STDERRSTDOUTSEPARATOR!!!}
  ERR=$(grep -v " is up to date." <<< "${COMBINED_OUT%!!!STDERRSTDOUTSEPARATOR!!!*}")

  if [[ "$LASTEXIT" != "0" ]] || [[ -n "$ERR" ]] ; then
    echo_err "$(echo -e "Error occured (exit code $LASTEXIT) retrieving dependencies of $@:\n$ERR\n$OUT")"
    exit 1
  fi

  # throw away non-children (what was in $@), throw away ascii art, convert to modnames
  perl -p -e 's/^[a-z].+//i; s/^[^a-z]+//i; s/\-[^\-]+$/ /; s/\-/::/g' <<< "$OUT"
}

parallel_installdeps_notest() {
  if [[ -z "$@" ]] ; then return; fi

  # flatten list into one string
  MODLIST=$(echo "$@")

  # The reason we do things so "non-interactively" is that xargs -P will have the
  # latest cpanm instance overwrite the buildlog. There seems to be no way to
  # specify a custom buildlog, hence we just collect the verbose output
  # and display it in case of failure
  run_or_err "Installing (without testing) $MODLIST" \
    "echo $MODLIST | xargs -n 1 -P $NUMTHREADS cpanm --notest --no-man-pages"
}


CPAN_is_sane() { perl -MCPAN\ 1.94_56 -e 1 &>/dev/null ; }