tools: add a helper tool to list all currently known codes

A non-installed tool to make it easy to check if newly added codes are
indeed supported correctly.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

meson.build

@@ -109,6 +109,11 @@ executable('libevdev-events',
 	   include_directories: [includes_include],
 	   dependencies: dep_libevdev,
 	   install: false)
+executable('libevdev-list-codes',
+	   sources: ['tools/libevdev-list-codes.c'],
+	   include_directories: [includes_include],
+	   dependencies: dep_libevdev,
+	   install: false)
 executable('touchpad-edge-detector',
 	   sources: ['tools/touchpad-edge-detector.c'],
 	   include_directories: [includes_include],

tools/Makefile.am

@@ -1,4 +1,4 @@
-noinst_PROGRAMS = libevdev-events
+noinst_PROGRAMS = libevdev-events libevdev-list-codes
 bin_PROGRAMS = \
 	       touchpad-edge-detector \
 	       mouse-dpi-tool \
@@ -10,6 +10,9 @@ libevdev_ldadd = $(top_builddir)/libevdev/libevdev.la
 libevdev_events_SOURCES = libevdev-events.c
 libevdev_events_LDADD = $(libevdev_ldadd)
 
+libevdev_list_codes_SOURCES = libevdev-list-codes.c
+libevdev_list_codes_LDADD = $(libevdev_ldadd)
+
 touchpad_edge_detector_SOURCES = touchpad-edge-detector.c
 touchpad_edge_detector_LDADD = $(libevdev_ldadd)
 

tools/libevdev-list-codes.c

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Red Hat, Inc.
+ */
+
+/* Lists all event types and codes currently known by libevdev. */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <linux/input.h>
+#include "libevdev/libevdev.h"
+
+static void
+list_event_codes(unsigned int type, unsigned int max)
+{
+	const char *typestr = libevdev_event_type_get_name(type);
+
+	if (!typestr)
+		return;
+
+	printf("- %s:\n", typestr);
+
+	for (unsigned int code = 0; code <= max; code++) {
+		const char *str = libevdev_event_code_get_name(type, code);
+
+		if (!str)
+			continue;
+
+		printf("    %d: %s\n", code, str);
+	}
+}
+
+int
+main (int argc, char **argv)
+{
+	printf("codes:\n");
+	for (unsigned int type = 0; type <= EV_MAX; type++) {
+		int max = libevdev_event_type_get_max(type);
+		if (max == -1)
+			continue;
+
+		list_event_codes(type, (unsigned int)max);
+	}
+
+	return 0;
+}