#!/usr/bin/env bash

: '
  * Attempt to generate clangd compile commands for a GNU Make target.
  '

. "$(dirname $0)/util/logging.bash"

define_usage <<EOU
Usage: $0 [-h] [-C MAKE_DIR] [-f MAKEFILE] [MAKE_TARGET]

OPTIONS
    -h  Display this help.

    -C DIR  Run GNU Make in specific directory.  See make(1) for more info.

    -f MAKEFILE  Tell GNU Make to use a specific Makefile.  See make(1) for more
                 info.

    -d  Run this program in "debug" mode.
EOU

MAKEFILE=''
MAKEDIR=''
DEBUG=0

while getopts 'hdC:f:' opt; do
  case "${opt}" in
    h)
      xcat <<<"$usage"
      ;;
    d)
      DEBUG=1
      ;;
    C)
      MAKEDIR="-C'$OPTARG'"
      ;;
    f)
      MAKEFILE="--file='$OPTARG'"
      ;;
  esac
done

shift $((OPTIND-1))

[ "$DEBUG" -ne 0 ] && set -x

make "$MAKEDIR" "$MAKEFILE" --always-make --dry-run ${@} \
  | grep -E '^\s*gcc|^\s*g\+\+|^\s*clang|^\s*clang\+\+' \
  | grep -w '\-c' \
  | jq -nR '[inputs|{directory:".", command:., file: match(" [^ ]+$").string[1:]}]'