From c063ec023c3547c887e8d1b6e38a9aec23b621ea Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Mon, 24 Aug 2020 20:09:14 +1000
Subject: [PATCH] tools/ei-demo: add hooks for choosing a backend

None exist other than the socket one but hey, the infrastructure is there.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
 tools/ei-demo-client.c | 61 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 57 insertions(+), 4 deletions(-)

diff --git a/tools/ei-demo-client.c b/tools/ei-demo-client.c
index 7f0a9b6..8913ba5 100644
--- a/tools/ei-demo-client.c
+++ b/tools/ei-demo-client.c
@@ -25,6 +25,7 @@
 
 #include <assert.h>
 #include <errno.h>
+#include <getopt.h>
 #include <poll.h>
 #include <stdio.h>
 #include <signal.h>
@@ -107,9 +108,57 @@ setup_keymap(struct ei_device *kbd)
 #endif
 }
 
+static void
+usage(FILE *fp, const char *argv0)
+{
+	fprintf(fp,
+		"Usage: %s [--socket]\n"
+		"\n"
+		"Start an EI demo client. The client will connect to EIS\n"
+		"with the chosen backend (default: socket) and emulate pointer\n"
+		"and keyboard events in a loop.\n"
+		"\n"
+		"Options:\n"
+		" --socket	Use the socket backend. The socket path is $LIBEI_SOCKET if set, \n"
+		"		otherwise XDG_RUNTIME/eis-0\n",
+		argv0);
+}
+
 int main(int argc, char **argv)
 {
-	const char SOCKETNAME[] = "eis-0";
+	enum {
+		SOCKET,
+	} backend = SOCKET;
+
+	while (1) {
+		enum {
+			OPT_BACKEND_SOCKET,
+			OPT_VERBOSE,
+		};
+		static struct option long_opts[] = {
+			{"socket",	no_argument, 0, OPT_BACKEND_SOCKET},
+			{"help",	no_argument, 0, 'h'},
+			{NULL},
+		};
+
+		int optind = 0;
+		int c = getopt_long(argc, argv, "h", long_opts, &optind);
+		if (c == -1)
+			break;
+
+		switch(c) {
+			case 'h':
+				usage(stdout, argv[0]);
+				return EXIT_SUCCESS;
+			case OPT_BACKEND_SOCKET:
+				backend = SOCKET;
+				break;
+			default:
+				usage(stderr, argv[0]);
+				return EXIT_FAILURE;
+		}
+	}
+
 	_cleanup_(ei_unrefp) struct ei *ei = ei_new(NULL);
 	assert(ei);
 
@@ -117,15 +166,19 @@ int main(int argc, char **argv)
 
 	ei_configure_name(ei, "ei-demo-client");
 
-	int rc = ei_setup_backend_socket(ei, getenv("LIBEI_SOCKET") ? NULL : SOCKETNAME);
+	int rc = -EINVAL;
+
+	if (backend == SOCKET) {
+		const char SOCKETNAME[] = "eis-0";
+		colorprint("connecting to %s\n", SOCKETNAME);
+		rc = ei_setup_backend_socket(ei, getenv("LIBEI_SOCKET") ? NULL : SOCKETNAME);
+	}
 
 	if (rc != 0) {
 		fprintf(stderr, "init failed: %s\n", strerror(errno));
 		return 1;
 	}
 
-	colorprint("connected to %s\n", SOCKETNAME);
-
 	struct pollfd fds = {
 		.fd = ei_get_fd(ei),
 		.events = POLLIN,