work-on

#!/usr/bin/env bash
set -euo pipefail

DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )

if [ "$#" -lt 2 ] ; then
  echo "Usage: $0 PLATFORM PACKAGE ..."
  echo "  PLATFORM can be either \"ghc\" or \"ghcjs\""
  echo "  PACKAGE can be any cabal package name or a path (including at least one '/' character) to a nix expression representing a cabal package"
  echo "  Any extra arguments will be passed along to nix-shell"
  echo
  echo "This script will drop you into a nix shell with access to the prerequisites of the chosen package on the chosen platform.  From there, you should be able to cabal configure [--ghcjs], cabal build, and cabal test.  Note that cabal install will not interoperate with Nix packages, and may not work at all."
  exit 1
fi

. "$DIR/common-setup.sh"

PLATFORM="$1"
shift
PACKAGE="$1"
shift

if echo "$PLATFORM" | grep -q '^(.*)$' ; then
    EFFECTIVE_PLATFORM="$PLATFORM"
elif echo "$PLATFORM" | grep -q / ; then
    PLATFORM_PATH="$(cleanup_nix_path "$PLATFORM")"
    EFFECTIVE_PLATFORM="(import $PLATFORM { reflex-platform = this; try-reflex = builtins.trace \"WARNING: the try-reflex parameter is deprecated; please update your script to refer to reflex-platform instead\" this; })"
else
    EFFECTIVE_PLATFORM="this.$PLATFORM"
fi

if echo "$PACKAGE" | grep -q / ; then
    # Package name includes a slash
    PACKAGE_PATH="$(cleanup_nix_path "$PACKAGE")"
    if ( echo "$PACKAGE_PATH" | grep -q '\.nix$' && [ -f "$PACKAGE_PATH" ] ) || [ -f "$PACKAGE_PATH/default.nix" ] ; then
        PACKAGE_INVOCATION="($EFFECTIVE_PLATFORM.callPackage $PACKAGE_PATH {})"
    elif test -n "$(shopt -s nullglob ; echo "$PACKAGE_PATH"/*.cabal)" ; then
        PACKAGE_INVOCATION="($EFFECTIVE_PLATFORM.callPackage (this.cabal2nixResult $PACKAGE_PATH) {})"
    else
        user_error 1 "Error: The given path must be a nix expression, a directory with a default.nix, or a directory with a cabal file"
    fi
else
    PACKAGE_INVOCATION="$EFFECTIVE_PLATFORM.$PACKAGE"
fi

terminate_logging
nix-shell $NIXOPTS -E "let this = import $DIR/. {}; in this.workOn $EFFECTIVE_PLATFORM $PACKAGE_INVOCATION" "$@"