rcpp-compdb

#!/usr/bin/env bash

RPKG_PATH=${1:-"."}

MAKEVARS="$RPKG_PATH/src/Makevars"
MAKEVARS_BAK="$(mktemp)"
JSON_TMPDIR="$(mktemp -d)"
JSON_TMPFILES="$JSON_TMPDIR/"'$@'".json"
TMPDIR="$(mktemp -d)"

function cleanup {
    # Return original Makevars
    if [[ -f "$MAKEVARS_BAK" ]]; then
        echo "Reverting Makevars from $MAKEVARS_BAK"
        rm "$MAKEVARS"
        mv "$MAKEVARS_BAK" "$MAKEVARS"
    fi

    # Remove temporary directories
    echo "Removing $TMPDIR and $JSON_TMPDIR"
    rm -rf "$TMPDIR" "$JSON_TMPDIR"
    echo "Done!"
}

trap cleanup EXIT

# Create a copy of Makevars
cp "$MAKEVARS" "$MAKEVARS_BAK" || exit 1

# Add additional PKG_CPPFLAGS to Makevars
echo "PKG_CPPFLAGS += -MJ \"$JSON_TMPFILES\"" >> "$MAKEVARS" || exit 1

# Install package to temporary location
R CMD INSTALL -l "$TMPDIR" --clean --preclean "$RPKG_PATH" || exit 1

# Combine json files into one
sed -e '1s/^/[/' -e '$s/,$/]/' "$JSON_TMPDIR"/*.json > "$RPKG_PATH/src/compile_commands.json" || exit 1