1 files changed, 45 insertions, 0 deletions
diff --git a/src/nvim/state_defs.h b/src/nvim/state_defs.h
new file mode 100644
index 0000000000..0b32412f5a
--- /dev/null
+++ b/src/nvim/state_defs.h
@@ -0,0 +1,45 @@
+#pragma once
+
+typedef struct vim_state VimState;
+
+typedef int (*state_check_callback)(VimState *state);
+typedef int (*state_execute_callback)(VimState *state, int key);
+
+struct vim_state {
+  state_check_callback check;
+  state_execute_callback execute;
+};
+
+/// Values for State
+///
+/// The lower bits up to 0x80 are used to distinguish normal/visual/op_pending
+/// /cmdline/insert/replace/terminal mode.  This is used for mapping.  If none
+/// of these bits are set, no mapping is done.  See the comment above do_map().
+/// The upper bits are used to distinguish between other states and variants of
+/// the base modes.
+enum {
+  MODE_NORMAL      = 0x01,  ///< Normal mode, command expected
+  MODE_VISUAL      = 0x02,  ///< Visual mode - use get_real_state()
+  MODE_OP_PENDING  = 0x04,  ///< Normal mode, operator is pending - use get_real_state()
+  MODE_CMDLINE     = 0x08,  ///< Editing the command line
+  MODE_INSERT      = 0x10,  ///< Insert mode, also for Replace mode
+  MODE_LANGMAP     = 0x20,  ///< Language mapping, can be combined with MODE_INSERT and MODE_CMDLINE
+  MODE_SELECT      = 0x40,  ///< Select mode, use get_real_state()
+  MODE_TERMINAL    = 0x80,  ///< Terminal mode
+
+  MAP_ALL_MODES    = 0xff,  ///< all mode bits used for mapping
+
+  REPLACE_FLAG     = 0x100,  ///< Replace mode flag
+  MODE_REPLACE     = REPLACE_FLAG | MODE_INSERT,
+  VREPLACE_FLAG    = 0x200,  ///< Virtual-replace mode flag
+  MODE_VREPLACE    = REPLACE_FLAG | VREPLACE_FLAG | MODE_INSERT,
+  MODE_LREPLACE    = REPLACE_FLAG | MODE_LANGMAP,
+
+  MODE_NORMAL_BUSY = 0x1000 | MODE_NORMAL,  ///< Normal mode, busy with a command
+  MODE_HITRETURN   = 0x2000 | MODE_NORMAL,  ///< waiting for return or command
+  MODE_ASKMORE     = 0x3000,  ///< Asking if you want --more--
+  MODE_SETWSIZE    = 0x4000,  ///< window size has changed
+  MODE_EXTERNCMD   = 0x5000,  ///< executing an external command
+  MODE_SHOWMATCH   = 0x6000 | MODE_INSERT,  ///< show matching paren
+  MODE_CONFIRM     = 0x7000,  ///< ":confirm" prompt
+};