Major rework of prompts. The basic prompt mechanics (draw, editing, etc)

are now wrapped up in prompt*.c and do not depend on a client. These
functions are used to provide the original client prompt but also to
allow panes to have their own prompts, which works much much better for
floating panes. The mode prompts for both the tree modes and copy mode
are switched over to be per pane.

There are some visible changes (some of these may be changed if they
don't seem to be working well):

- Prompts in modes now appear in the bottom line, covering whatever
  content was there.

- command-prompt has a -P flag to open a pane prompt.

- Because they cover the content, the default style for prompts in modes
  now does not fill the entire line; the main command prompt stays the
  same.

- The old completion menu has gone, and completions are now shown after
  the text. Builtin aliases are no longer completed.

- Clicking the mouse on the prompt now moves the cursor or selects a
  completion.

tmux.h

@@ -62,6 +62,8 @@ struct mouse_event;
 struct options;
 struct options_array_item;
 struct options_entry;
+struct prompt;
+struct window_pane_prompt;
 struct redraw_scene;
 struct redraw_span;
 struct screen_write_citem;
@@ -1296,6 +1298,10 @@ struct window_pane {
 	char		*searchstr;
 	int		 searchregex;
 
+	struct prompt	*prompt;
+	struct window_pane_prompt *prompt_data;
+	u_int		 prompt_cx;
+
 	int		 border_gc_set;
 	struct grid_cell border_gc;
 	int		 active_border_gc_set;
@@ -1936,20 +1942,12 @@ struct status_line {
 	struct screen		*active;
 	int			 references;
 
+	u_int			 prompt_cx;
+
 	struct grid_cell	 style;
 	struct style_line_entry entries[STATUS_LINES_LIMIT];
 };
 
-/* Prompt type. */
-#define PROMPT_NTYPES 4
-enum prompt_type {
-	PROMPT_TYPE_COMMAND,
-	PROMPT_TYPE_SEARCH,
-	PROMPT_TYPE_TARGET,
-	PROMPT_TYPE_WINDOW_TARGET,
-	PROMPT_TYPE_INVALID = 0xff
-};
-
 /* File in client. */
 typedef void (*client_file_cb) (struct client *, const char *, int, int,
     struct evbuffer *, void *);
@@ -1990,6 +1988,14 @@ RB_HEAD(client_windows, client_window);
 /* Maximum time to be pasting. */
 #define CLIENT_PASTE_TIME_LIMIT 5
 
+/* Prompt type. */
+#define PROMPT_NTYPES 2
+enum prompt_type {
+	PROMPT_TYPE_COMMAND,
+	PROMPT_TYPE_SEARCH,
+	PROMPT_TYPE_INVALID = 0xff
+};
+
 /* Prompt result. */
 enum prompt_result {
 	PROMPT_CONTINUE,
@@ -2005,11 +2011,63 @@ enum prompt_key_result {
 };
 
 /* Prompt callbacks. */
-typedef enum prompt_result (*prompt_input_cb)(struct client *, void *,
+typedef enum prompt_result (*prompt_input_cb)(void *, const char *,
+    enum prompt_key_result);
+typedef enum prompt_result (*status_prompt_input_cb)(struct client *, void *,
+    const char *, enum prompt_key_result);
+typedef enum prompt_result (*mode_tree_prompt_input_cb)(struct client *, void *,
     const char *, enum prompt_key_result);
 typedef void (*prompt_free_cb)(void *);
 
-/* Overlay callbacks. */
+/* Prompt flags. */
+#define PROMPT_SINGLE 0x1
+#define PROMPT_NUMERIC 0x2
+#define PROMPT_INCREMENTAL 0x4
+#define PROMPT_NOFORMAT 0x8
+#define PROMPT_KEY 0x10
+#define PROMPT_ACCEPT 0x20
+#define PROMPT_QUOTENEXT 0x40
+#define PROMPT_BSPACE_EXIT 0x80
+#define PROMPT_NOFREEZE 0x100
+#define PROMPT_COMMANDMODE 0x200
+#define PROMPT_ISPANE 0x400
+#define PROMPT_ISMODE 0x800
+
+/* Prompt create data. */
+struct prompt_create_data {
+	struct cmd_find_state	*fs;
+	const char		*prompt;
+	const char		*input;
+	enum prompt_type	 type;
+	int			 flags;
+
+	struct grid_cell	 style;
+	struct grid_cell	 command_style;
+	enum screen_cursor_style cstyle;
+	enum screen_cursor_style command_cstyle;
+	int			 ccolour;
+	int			 cmode;
+	int			 command_cmode;
+	const char		*message_format;
+	int			 keys;
+	const char		*word_separators;
+
+	prompt_input_cb		 inputcb;
+	prompt_free_cb		 freecb;
+	void			*data;
+};
+
+/* Prompt draw data. */
+struct prompt_draw_data {
+	struct screen_write_ctx	*ctx;
+	u_int			*cursor_x;
+
+	u_int			 area_x;
+	u_int			 area_width;
+	u_int			 prompt_line;
+};
+
+/* Overlay callbacks */
 typedef struct visible_ranges *(*overlay_check_cb)(struct client *, void *,
     u_int, u_int, u_int);
 typedef struct screen *(*overlay_mode_cb)(struct client *, void *, u_int *,
@@ -2154,29 +2212,7 @@ struct client {
 	char			*message_string;
 	struct event		 message_timer;
 
-	char			*prompt_string;
-	struct utf8_data	*prompt_buffer;
-	struct cmd_find_state	 prompt_state;
-	char			*prompt_last;
-	size_t			 prompt_index;
-	prompt_input_cb		 prompt_inputcb;
-	prompt_free_cb		 prompt_freecb;
-	void			*prompt_data;
-	u_int			 prompt_hindex[PROMPT_NTYPES];
-	struct utf8_data	*prompt_saved;
-#define PROMPT_SINGLE 0x1
-#define PROMPT_NUMERIC 0x2
-#define PROMPT_INCREMENTAL 0x4
-#define PROMPT_NOFORMAT 0x8
-#define PROMPT_KEY 0x10
-#define PROMPT_ACCEPT 0x20
-#define PROMPT_QUOTENEXT 0x40
-#define PROMPT_BSPACE_EXIT 0x80
-#define PROMPT_NOFREEZE 0x100
-#define PROMPT_COMMANDMODE 0x200
-	int			 prompt_flags;
-	enum prompt_type	 prompt_type;
-	int			 prompt_cursor;
+	struct prompt		*prompt;
 
 	struct session		*session;
 	struct session		*last_session;
@@ -3100,8 +3136,6 @@ void	 server_check_unattached(void);
 void	 server_unzoom_window(struct window *);
 
 /* status.c */
-extern char	**status_prompt_hlist[];
-extern u_int	  status_prompt_hsize[];
 void	 status_timer_start(struct client *);
 void	 status_timer_start_all(void);
 void	 status_update_cache(struct session *);
@@ -3117,16 +3151,38 @@ void printflike(6, 7) status_message_set(struct client *, int, int, int, int,
 void	 status_message_clear(struct client *);
 int	 status_message_redraw(struct client *);
 void	 status_prompt_set(struct client *, struct cmd_find_state *,
-	     const char *, const char *, prompt_input_cb, prompt_free_cb,
+	     const char *, const char *, status_prompt_input_cb, prompt_free_cb,
 	     void *, int, enum prompt_type);
 void	 status_prompt_clear(struct client *);
 int	 status_prompt_redraw(struct client *);
-enum prompt_key_result status_prompt_key(struct client *, key_code);
+void	 status_prompt_cursor(struct client *, u_int *, u_int *);
+enum prompt_key_result status_prompt_key(struct client *, key_code,
+	     struct mouse_event *);
 void	 status_prompt_update(struct client *, const char *, const char *);
-void	 status_prompt_load_history(void);
-void	 status_prompt_save_history(void);
-const char *status_prompt_type_string(u_int);
-enum prompt_type status_prompt_type(const char *type);
+
+/* prompt.c */
+void	 prompt_set_options(struct prompt_create_data *, struct session *);
+struct prompt *prompt_create(const struct prompt_create_data *);
+void	 prompt_free(struct prompt *);
+void	 prompt_incremental_start(struct prompt *);
+void	 prompt_draw(struct prompt *, struct prompt_draw_data *);
+enum prompt_key_result prompt_key(struct prompt *, key_code, int *);
+enum prompt_key_result prompt_mouse(struct prompt *, u_int, u_int, u_int,
+	     int *);
+void	 prompt_update(struct prompt *, const char *, const char *);
+int	 prompt_closed(struct prompt *);
+enum prompt_type prompt_type(const char *);
+const char *prompt_type_string(enum prompt_type);
+
+/* prompt-history.c */
+const char *prompt_up_history(u_int *, u_int);
+const char *prompt_down_history(u_int *, u_int);
+void	 prompt_add_history(const char *, u_int);
+u_int	 prompt_history_size(enum prompt_type);
+const char *prompt_history_get(enum prompt_type, u_int);
+void	 prompt_history_clear(enum prompt_type);
+void	 prompt_load_history(void);
+void	 prompt_save_history(void);
 
 /* resize.c */
 void	 resize_window(struct window *, u_int, u_int, int, int);
@@ -3452,6 +3508,16 @@ int		 window_pane_key(struct window_pane *, struct client *,
 		     struct mouse_event *);
 void		 window_pane_paste(struct window_pane *, key_code, char *,
 		     size_t);
+void		 window_pane_set_prompt(struct window_pane *, struct client *,
+		     struct cmd_find_state *, const char *, const char *,
+		     status_prompt_input_cb, prompt_free_cb, void *, int,
+		     enum prompt_type);
+void		 window_pane_clear_prompt(struct window_pane *);
+int		 window_pane_has_prompt(struct window_pane *);
+void		 window_pane_update_prompt(struct window_pane *, const char *,
+		     const char *);
+enum prompt_key_result window_pane_prompt_key(struct window_pane *,
+		     struct client *, key_code, struct mouse_event *);
 int		 window_pane_is_visible(struct window_pane *);
 int		 window_pane_exited(struct window_pane *);
 u_int		 window_pane_search(struct window_pane *, const char *, int,
@@ -3612,6 +3678,11 @@ void	 mode_tree_remove(struct mode_tree_data *, struct mode_tree_item *);
 void	 mode_tree_draw(struct mode_tree_data *);
 int	 mode_tree_key(struct mode_tree_data *, struct client *, key_code *,
 	     struct mouse_event *, u_int *, u_int *);
+void	 mode_tree_set_prompt(struct mode_tree_data *, struct client *,
+	     const char *, const char *, enum prompt_type, int,
+	     mode_tree_prompt_input_cb, prompt_free_cb, void *);
+void	 mode_tree_clear_prompt(struct mode_tree_data *);
+int	 mode_tree_has_prompt(struct mode_tree_data *);
 void	 mode_tree_run_command(struct client *, struct cmd_find_state *,
 	     const char *, const char *);