Move the event printing out into a utility

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1156>

meson.build

@@ -445,11 +445,23 @@ endif
 
 subdir('completion/zsh')
 
+############ libinput-util-libinput.a ############
+
+# This one needs libinput itself
+src_libinput_util_libinput = [
+	'src/util-libinput.c'
+]
+libinput_util_libinput = static_library('libinput-util-libinput',
+					src_libinput_util_libinput,
+					dependencies : [dep_libevdev, dep_libinput_util, dep_libinput],
+					include_directories : includes_include)
+dep_libinput_util_libinput = declare_dependency(link_with : libinput_util_libinput)
+
 ############ tools ############
 libinput_tool_path = dir_libexec
 config_h.set_quoted('LIBINPUT_TOOL_PATH', libinput_tool_path)
 tools_shared_sources = [ 'tools/shared.c' ]
-deps_tools_shared = [ dep_libinput, dep_libevdev ]
+deps_tools_shared = [ dep_libinput, dep_libevdev, dep_libinput_util_libinput ]
 lib_tools_shared = static_library('tools_shared',
 				  tools_shared_sources,
 				  include_directories : [includes_src, includes_include],

src/util-libinput.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright © 2025 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+
+#include "libinput.h"
+
+struct libinput_print_options {
+	uint32_t screen_width;
+	uint32_t screen_height;
+	uint32_t start_time;
+	bool show_keycodes;
+};
+
+char *
+libinput_event_to_str(struct libinput_event *ev,
+		      size_t event_repeat_count,
+		      const struct libinput_print_options *opts);