build-cabal

#!/usr/bin/env bash

# stolen from hadrian

CABAL="${CABAL:-cabal}"
GHC="${GHC:-ghc}"
CABFLAGS=("--with-compiler=$GHC" "--disable-documentation" "--disable-profiling" "--disable-library-profiling" $CABFLAGS)
PROJ="$PWD/prebuilder.cabal"

set -euo pipefail

if ! [ -f "$PROJ" ]; then
    echo "Current working directory must be prebuilder's top-level folder"
    exit 2
fi

if ! type "$CABAL" > /dev/null; then
    echo "Please make sure 'cabal' is in your PATH"
    exit 2
fi

CABVERSTR=$("$CABAL" --numeric-version)
CABVER=( ${CABVERSTR//./ } )

if [ "${CABVER[0]}" -gt 2 -o "${CABVER[0]}" -eq 2 -a "${CABVER[1]}" -ge 2 ];
then
    "$CABAL" build "${CABFLAGS[@]}" -j exe:prebuilder
    # use exec instead of new-run to make sure that the libime tools can be accessed
    "$CABAL" exec "${CABFLAGS[@]}" prebuilder -- "$@"
else
    echo "Cabal version is too old; you need at least cabal-install 2.2"
    exit 2
fi