#!/bin/bash
# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

### generate a compilation database for the current build configuration

## usage: fx compdb <-z>
##        -z|--zircon to additonally generate compile_commands.json for Zircon
##        -z option also concatenates the two compile_commands.json

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
fx-config-read

generate_zircon () {
    zirc_compdb=$(which compiledb || echo)
    if [[ -z ${zirc_compdb} ]]; then
        echo "Could not find compiledb, cannot generate Zircon compile_commands.json"
        exit
    fi

    ( cd ${FUCHSIA_DIR}/zircon; "${FUCHSIA_DIR}/scripts/build-zircon.sh" -t "${FUCHSIA_ARCH}" -n | compiledb -o compile_commands.json -n) \
    || echo "An unknown error has occurred"     #TODO what errors could this be?
}

main () {
    zirc=0 #boolean for if compiledb has been run

    case $1 in
        -z|--zircon)
            zirc=1
        ;;
        -h|--help)
            echo "Script to generate compile_commands.json files"
            echo "-z|--zircon to additonally generate compile_commands.json for Zircon"
            echo "-z option also concatenates the two compile_commands.json"
            echo
            exit
        ;;
    esac

    source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
    fx-config-read

    fx-try-locked "${FUCHSIA_DIR}/buildtools/gn" gen "${FUCHSIA_BUILD_DIR}" --export-compile-commands
    ln -sf "${FUCHSIA_BUILD_DIR}/compile_commands.json" "${FUCHSIA_DIR}/compile_commands.json"


    if [[ $zirc -eq 1 ]]; then
        generate_zircon
        #concatenate the two files together by making a tmp file and then removing it when done

        ${FUCHSIA_DIR}/scripts/editors/cat_compile_commands.py ${FUCHSIA_DIR}/zircon/compile_commands.json \
        ${FUCHSIA_DIR}/out/${FUCHSIA_ARCH}/compile_commands.json > ${FUCHSIA_DIR}/compile_commands-tmp.json \
        && cp ${FUCHSIA_DIR}/compile_commands-tmp.json ${FUCHSIA_DIR}/compile_commands.json \
        && rm ${FUCHSIA_DIR}/compile_commands-tmp.json
    fi
}

main "$@"