# Apply *.diff patches under ${PORTAGE_PATCHDIR} for the current package.
# *.patch files are skipped to avoid double application if the ebuild
# calls {epatch,eapply}_user.  Requires a copy of the now-obsolete
# epatch.eclass in /etc/portage, which can be fetched from
# <https://achurch.org/portage-epatch.eclass>.
#
# Written by Andrew Church <achurch@achurch.org>
# Last updated 2025-12-10
# Based on comments in <https://forums.gentoo.org/viewtopic-t-791464.html>

_my_epatch_user() {
	if test -f "${T}/.portage_user_patches_applied"; then
		return
	fi
	>>"${T}/.portage_user_patches_applied"

	if test -z "${PORTAGE_PATCHDIR}" || test ! -d "${PORTAGE_PATCHDIR}/${CATEGORY}/${PN}"; then
		return
	fi

	if test "$(type -t epatch)" != "function"; then
		eval "$(sed -n '/^epatch()/,/^}/p' /etc/portage/epatch.eclass)"
	fi
	__vecho ">>> Applying custom patches..."
	(
		if cd "$S"; then
			for patch in "${PORTAGE_PATCHDIR}/${CATEGORY}/${PN}"/* \
			             "${PORTAGE_PATCHDIR}/${CATEGORY}/${PN}/${PV}"/*; do
				test -f "${patch}" || continue
				# *.patch files are handled by Portage itself.
				if echo "${patch}" | grep -q '\.patch$'; then continue; fi
				epatch "${patch}" || die "Failed to apply patch ${patch}"
			done
		fi
	)
}

post_src_unpack() {
	if test "${EAPI-0}" -lt 2; then
		_my_epatch_user
	fi
}

post_src_prepare() {
	if test "${EAPI-0}" -ge 2; then
		_my_epatch_user
	fi
}

# Override EAPI 6's eapply_user to use our routine.
eapply_user() { _my_epatch_user; }
readonly -f eapply_user

# Override eutils.eclass's epatch_user to use our routine.
epatch_user() { _my_epatch_user; }
readonly -f epatch_user