#!/bin/sh
# Run a regression test before pushing to code.haskell.org
# People don't like code that doesn't compile

# Configuration
if [ -z "${TMPDIR}" ] ; then
    TMPDIR=/tmp
fi
if [ -z "${TESTDIR}" ] ; then
    TESTDIR=regression_test
fi
if [ -z "${DEFAULT_BROWSER}" ] ; then
    DEFAULT_BROWSER=firefox
fi
if [ -e ".git" ] ; then
    HAS_GIT=1
elif [ -e "_darcs" ] ; then
    HAS_DARCS=1
else
    echo "Please run this script from the language-c repository (darcs or git)" >&2
    exit 1
fi

# messages
function die() {
    echo "*** Regression test failed: $1 ***" 1>&2; exit 1
}
function warning() {
    echo "[WARNING] $1" 1>&2
}

# preparation
if [ ! -d "$TMPDIR" ] ; then
    die "TMPDIR ('$TMPDIR') directory does not exist " \
        "(absolute path to a directory for temporary files)"
fi

if [ ! -d "$TESTDIR" ] ; then
    warning "'$TESTDIR' directory does not exist " \
            "(needs to be a checkout of your local HEAD)"
    savedir="$(pwd)"
    mkdir -p $(dirname "${TESTDIR}")
    pushd $(dirname "${TESTDIR}")
    if [ $HAS_GIT -eq 1 ] ; then
        git clone "${savedir}" $(basename "${TESTDIR}") || die "Failed to clone local git repo"
    else
        darcs clone "${savedir}" $(basename "${TESTDIR}") || die "Failed to clone local darcs repo"
    fi
    popd
fi

# update
cd "${TESTDIR}"
if [ $HAS_GIT -eq 1 ] ; then
    git pull origin master || die "git pull (from local HEAD) failed"
else
    darcs pull || die "darcs pull (from local HEAD) failed"
fi


# regression test
echo "Building via cabal"
cabal configure || die "cabal configure failed"
cabal build || die "cabal build failed"
cabal haddock || die "cabal haddock failed"
echo "Finished building via cabal"

cd test
echo "Building test suite"
make || die "make failed in /test"

(cd harness && make) || die \
    "test harness failed"

(cd suite && yes | bash run-smoke.sh && yes | bash run-bugs.sh) || die \
    "run-dg.sh failed - make sure there is a symlink or copy " \
    "to the gcc.dg testsuite in $TMPDIR/test/suite"

( cd results && ../bin/RenderTests regression *dat) || die "rendering tests failed"

${BROWSER:-${DEFAULT_BROWSER}} results/index.html

exit 0