1 files changed, 115 insertions, 0 deletions
diff --git a/eclass/virtualwl.eclass b/eclass/virtualwl.eclass
new file mode 100644
index 0000000..162f615
--- /dev/null
+++ b/eclass/virtualwl.eclass
@@ -0,0 +1,115 @@
+# Copyright 2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: virtualwl.eclass
+# @MAINTAINER:
+# alex_y_xu@yahoo.ca
+# @AUTHOR:
+# Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
+# @SUPPORTED_EAPIS: 7 8
+# @BLURB: Similar to virtualx.eclass, but using Wayland.
+
+case ${EAPI} in
+	7|8) ;;
+	*) die "${ECLASS}: EAPI ${EAPI} unsupported."
+esac
+
+if [[ ! ${_VIRTUALWL_ECLASS} ]]; then
+_VIRTUALWL_ECLASS=1
+
+# @ECLASS-VARIABLE: VIRTUALWL_REQUIRED
+# @PRE_INHERIT
+# @DESCRIPTION:
+# Variable specifying the dependency on wayland.
+# Possible special values are "always" and "manual", which specify
+# the dependency to be set unconditionally or not at all.
+# Any other value is taken as useflag desired to be in control of
+# the dependency (eg. VIRTUALWL_REQUIRED="kde" will add the dependency
+# into "kde? ( )" and add kde into IUSE.
+: ${VIRTUALWL_REQUIRED:=test}
+
+# @ECLASS-VARIABLE: VIRTUALWL_DEPEND
+# @OUTPUT_VARIABLE
+# @DESCRIPTION:
+# Standard dependencies string that is automatically added to BDEPEND
+# unless VIRTUALWL_REQUIRED is set to "manual".
+readonly VIRTUALWL_DEPEND="
+	gui-wm/tinywl
+"
+
+case ${VIRTUALWL_REQUIRED} in
+	manual)
+		;;
+	always)
+		BDEPEND="${VIRTUALWL_DEPEND}"
+		;;
+	*)
+		BDEPEND="${VIRTUALWL_REQUIRED}? ( ${VIRTUALWL_DEPEND} )"
+		IUSE="${VIRTUALWL_REQUIRED}"
+		[[ ${VIRTUALWL_REQUIRED} == "test" ]] &&
+			RESTRICT+=" !test? ( test )"
+		;;
+esac
+
+# @FUNCTION: virtwl
+# @USAGE: <command> [command arguments]
+# @DESCRIPTION:
+# Start a new wayland session and run commands in it.
+#
+# IMPORTANT: This command is run nonfatal !!!
+#
+# This means we are checking for the return code and raise an exception if it
+# isn't 0. So you need to make sure that all commands return a proper
+# code and not just die. All eclass function used should support nonfatal
+# calls properly.
+#
+# The rationale behind this is the tear down of the started wayland session. A
+# straight die would leave a running session behind.
+#
+# Example:
+#
+# @CODE
+# src_test() {
+#     virtwl default
+# }
+# @CODE
+#
+# @CODE
+# python_test() {
+#     virtwl py.test --verbose
+# }
+# @CODE
+#
+# @CODE
+# my_test() {
+#   some_command
+#   return $?
+# }
+#
+# src_test() {
+#	  virtwl my_test
+# }
+# @CODE
+virtwl() {
+	debug-print-function ${FUNCNAME} "$@"
+
+	[[ $# -lt 1 ]] && die "${FUNCNAME} needs at least one argument"
+	[[ -n $XDG_RUNTIME_DIR ]] || die "${FUNCNAME} needs XDG_RUNTIME_DIR to be set; try xdg_environment_reset"
+	tinywl -h >/dev/null || die 'tinywl -h failed'
+
+	# TODO: don't run addpredict in utility function. WLR_RENDERER=pixman doesn't work
+	addpredict /dev/dri
+	coproc VIRTWL { WLR_BACKENDS=headless exec tinywl -s 'echo $WAYLAND_DISPLAY'; }
+	local -x WAYLAND_DISPLAY
+	read WAYLAND_DISPLAY <&${VIRTWL[0]}
+
+	debug-print "${FUNCNAME}: $@"
+	nonfatal "$@"
+	retval=$?
+
+	[[ -n $VIRTWL_PID ]] || die "tinywl exited unexpectedly"
+	kill $VIRTWL_PID
+
+	[[ $retval = 0 ]] || die "Failed to run '$@'"
+}
+fi