Add initial version of i3-input, an interactive tool for sending IPC commands

i3-input/i3-input.h

@@ -0,0 +1,18 @@
+#ifndef _I3_INPUT
+#define _I3_INPUT
+
+#include <err.h>
+
+#define die(...) errx(EXIT_FAILURE, __VA_ARGS__);
+
+char *convert_ucs_to_utf8(char *input);
+uint32_t get_colorpixel(xcb_connection_t *conn, char *hex);
+uint32_t get_mode_switch_mask(xcb_connection_t *conn);
+int connect_ipc(char *socket_path);
+void ipc_send_message(int sockfd, uint32_t message_size,
+                      uint32_t message_type, uint8_t *payload);
+xcb_window_t open_input_window(xcb_connection_t *conn, uint32_t width, uint32_t height);
+int get_font_id(xcb_connection_t *conn, char *pattern, int *font_height);
+void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value);
+
+#endif