1 files changed, 95 insertions, 0 deletions
diff --git a/src/nvim/ui_defs.h b/src/nvim/ui_defs.h
new file mode 100644
index 0000000000..c4707d4d7c
--- /dev/null
+++ b/src/nvim/ui_defs.h
@@ -0,0 +1,95 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "nvim/api/private/defs.h"
+
+/// Keep in sync with ui_ext_names[] in ui.h
+typedef enum {
+  kUICmdline = 0,
+  kUIPopupmenu,
+  kUITabline,
+  kUIWildmenu,
+  kUIMessages,
+#define kUIGlobalCount kUILinegrid
+  kUILinegrid,
+  kUIMultigrid,
+  kUIHlState,
+  kUITermColors,
+  kUIFloatDebug,
+  kUIExtCount,
+} UIExtension;
+
+enum {
+  kLineFlagWrap = 1,
+  kLineFlagInvalid = 2,
+};
+
+typedef int LineFlags;
+
+typedef struct ui_t UI;
+
+typedef struct {
+  uint64_t channel_id;
+
+#define UI_BUF_SIZE 4096  ///< total buffer size for pending msgpack data.
+  /// guaranteed size available for each new event (so packing of simple events
+  /// and the header of grid_line will never fail)
+#define EVENT_BUF_SIZE 256
+  char buf[UI_BUF_SIZE];  ///< buffer of packed but not yet sent msgpack data
+  char *buf_wptr;  ///< write head of buffer
+  const char *cur_event;  ///< name of current event (might get multiple arglists)
+  Array call_buf;  ///< buffer for constructing a single arg list (max 16 elements!)
+
+  // state for write_cb, while packing a single arglist to msgpack. This
+  // might fail due to buffer overflow.
+  size_t pack_totlen;
+  bool buf_overflow;
+  char *temp_buf;
+
+  // We start packing the two outermost msgpack arrays before knowing the total
+  // number of elements. Thus track the location where array size will need
+  // to be written in the msgpack buffer, once the specific array is finished.
+  char *nevents_pos;
+  char *ncalls_pos;
+  uint32_t nevents;  ///< number of distinct events (top-level args to "redraw"
+  uint32_t ncalls;  ///< number of calls made to the current event (plus one for the name!)
+  bool flushed_events;  ///< events where sent to client without "flush" event
+
+  size_t ncells_pending;  ///< total number of cells since last buffer flush
+
+  int hl_id;  // Current highlight for legacy put event.
+  Integer cursor_row, cursor_col;  // Intended visible cursor position.
+
+  // Position of legacy cursor, used both for drawing and visible user cursor.
+  Integer client_row, client_col;
+  bool wildmenu_active;
+} UIData;
+
+struct ui_t {
+  bool rgb;
+  bool override;  ///< Force highest-requested UI capabilities.
+  bool composed;
+  bool ui_ext[kUIExtCount];  ///< Externalized UI capabilities.
+  int width;
+  int height;
+  int pum_nlines;  /// actual nr. lines shown in PUM
+  bool pum_pos;  /// UI reports back pum position?
+  double pum_row;
+  double pum_col;
+  double pum_height;
+  double pum_width;
+
+  // TUI fields.
+  char *term_name;
+  char *term_background;  ///< Deprecated. No longer needed since background color detection happens
+                          ///< in Lua. To be removed in a future release.
+  int term_colors;
+  bool stdin_tty;
+  bool stdout_tty;
+
+  // TODO(bfredl): integrate into struct!
+  UIData data[1];
+};