# Copyright (C) 2024 dwlr <dweller@cabin.digital>
#
# BSD 3-Clause License (BSD-3-Clause)
# See LICENSE for details

# This file is intended to be sourced as part of a "self-building" .c file
set -e

CC=${CC:-cc}
STATIC=${STATIC:-yes}
DEBUG=${DEBUG:-yes}
RUN=${RUN:-yes}
OUT=${OUT:-a.out}
CFLAGS=${CFLAGS:-"-Wall -Wextra"}
[ "$STATIC" = "yes" ] && CFLAGS="$CFLAGS -static"
DBGFLAGS=${DBGFLAGS:-"-g -Og"}
RELFLAGS=${RELFLAGS:-"-O2"}

msg()
{
    fmt="$1"
    shift
    printf "\033[1m --- $fmt\033[0m\n" $@
}

if [ -e "$OUT" ] && [ -z "$(find . -newer "$OUT" -regex '.*\.\(c\|h\)')" ] \
&& [ "$(file "$OUT" | grep "not stripped" > /dev/null && echo yes || echo no)" = "$DEBUG" ] \
&& [ "$(file "$OUT" | grep "statically" > /dev/null && echo yes || echo no)" = "$STATIC" ]
then
    msg "rebuild not necessary" 1>&2
else
    start="$(date +%s.%N)"

    if [ "$DEBUG" = "yes" ]
        then CFLAGS="$CFLAGS $DBGFLAGS"
        else CFLAGS="$CFLAGS $RELFLAGS"
    fi

    "$CC" "$0" $CFLAGS -o ./"$OUT"
    [ "$DEBUG" != "yes" ] && strip "$OUT"

    end="$(date +%s.%N)"
    msg "cc time: %s sec" "$(echo "$end - $start" | bc)" 1>&2
    msg "debug=%s; static=%s" "$DEBUG" "$STATIC" 1>&2

fi

if [ "$RUN" = "yes" ]; then
    msg "Program output:\n" 1>&2
    ./"$OUT" "$@"
fi

exit