text: /* $OpenBSD$ */
  
  /*
   * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
   * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
   * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #ifndef TMUX_H
  #define TMUX_H
  
  #include <sys/time.h>
  #include <sys/uio.h>
  
  #include <event.h>
  #include <limits.h>
  #include <stdarg.h>
  #include <stdio.h>
  #include <termios.h>
  
  #ifdef HAVE_UTEMPTER
  #include <utempter.h>
  #endif
  
  #include "compat.h"
  #include "xmalloc.h"
  
  extern char   **environ;
  
  struct args;
  struct args_value;
  struct client;
  struct cmd;
  struct cmd_find_state;
  struct cmdq_item;
  struct cmdq_list;
  struct cmdq_state;
  struct cmds;
  struct control_state;
  struct environ;
  struct format_job_tree;
  struct format_tree;
  struct input_ctx;
  struct job;
  struct mode_tree_data;
  struct mouse_event;
  struct options;
  struct options_array_item;
  struct options_entry;
  struct screen_write_collect_item;
  struct screen_write_collect_line;
  struct screen_write_ctx;
  struct session;
  struct tty_ctx;
  struct tmuxpeer;
  struct tmuxproc;
  struct winlink;
  
  /* Client-server protocol version. */
  #define PROTOCOL_VERSION 8
  
  /* Default configuration files and socket paths. */
  #ifndef TMUX_CONF
  #define TMUX_CONF "/etc/tmux.conf:~/.tmux.conf"
  #endif
  #ifndef TMUX_SOCK
  #define TMUX_SOCK "$TMUX_TMPDIR:" _PATH_TMP
  #endif
  
  /* Minimum layout cell size, NOT including border lines. */
  #define PANE_MINIMUM 1
  
  /* Minimum and maximum window size. */
  #define WINDOW_MINIMUM PANE_MINIMUM
  #define WINDOW_MAXIMUM 10000
  
  /* Automatic name refresh interval, in microseconds. Must be < 1 second. */
  #define NAME_INTERVAL 500000
  
  /* Default pixel cell sizes. */
  #define DEFAULT_XPIXEL 16
  #define DEFAULT_YPIXEL 32
  
  /* Attribute to make GCC check printf-like arguments. */
  #define printflike(a, b) __attribute__ ((format (printf, a, b)))
  
  /* Number of items in array. */
  #ifndef nitems
  #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
  #endif
  
  /* Alert option values. */
  #define ALERT_NONE 0
  #define ALERT_ANY 1
  #define ALERT_CURRENT 2
  #define ALERT_OTHER 3
  
  /* Visual option values. */
  #define VISUAL_OFF 0
  #define VISUAL_ON 1
  #define VISUAL_BOTH 2
  
  /* Special key codes. */
  #define KEYC_NONE            0x00ff000000000ULL
  #define KEYC_UNKNOWN         0x00fe000000000ULL
  #define KEYC_BASE            0x0001000000000ULL
  #define KEYC_USER            0x0002000000000ULL
  
  /* Key modifier bits. */
  #define KEYC_META            0x00100000000000ULL
  #define KEYC_CTRL            0x00200000000000ULL
  #define KEYC_SHIFT           0x00400000000000ULL
  
  /* Key flag bits. */
  #define KEYC_LITERAL         0x01000000000000ULL
  #define KEYC_KEYPAD          0x02000000000000ULL
  #define KEYC_CURSOR          0x04000000000000ULL
  #define KEYC_IMPLIED_META    0x08000000000000ULL
  #define KEYC_BUILD_MODIFIERS 0x10000000000000ULL
  
  /* Masks for key bits. */
  #define KEYC_MASK_MODIFIERS  0x00f00000000000ULL
  #define KEYC_MASK_FLAGS      0xff000000000000ULL
  #define KEYC_MASK_KEY        0x000fffffffffffULL
  
  /* Available user keys. */
  #define KEYC_NUSER 1000
  
  /* Is this a mouse key? */
  #define KEYC_IS_MOUSE(key) (((key) & KEYC_MASK_KEY) >= KEYC_MOUSE &&	\
      ((key) & KEYC_MASK_KEY) < KEYC_BSPACE)
  
  /* Multiple click timeout. */
  #define KEYC_CLICK_TIMEOUT 300
  
  /* Mouse key codes. */
  #define KEYC_MOUSE_KEY(name)					\
  	KEYC_ ## name ## _PANE,					\
  	KEYC_ ## name ## _STATUS,				\
  	KEYC_ ## name ## _STATUS_LEFT,				\
  	KEYC_ ## name ## _STATUS_RIGHT,				\
  	KEYC_ ## name ## _STATUS_DEFAULT,			\
  	KEYC_ ## name ## _BORDER
  #define KEYC_MOUSE_STRING(name, s)				\
  	{ #s "Pane", KEYC_ ## name ## _PANE },			\
  	{ #s "Status", KEYC_ ## name ## _STATUS },		\
  	{ #s "StatusLeft", KEYC_ ## name ## _STATUS_LEFT },	\
  	{ #s "StatusRight", KEYC_ ## name ## _STATUS_RIGHT },	\
  	{ #s "StatusDefault", KEYC_ ## name ## _STATUS_DEFAULT }, \
  	{ #s "Border", KEYC_ ## name ## _BORDER }
  
  /*
   * A single key. This can be ASCII or Unicode or one of the keys starting at
   * KEYC_BASE.
   */
  typedef unsigned long long key_code;
  
  /* Special key codes. */
  enum {
  	/* Focus events. */
  	KEYC_FOCUS_IN = KEYC_BASE,
  	KEYC_FOCUS_OUT,
  
  	/* "Any" key, used if not found in key table. */
  	KEYC_ANY,
  
  	/* Paste brackets. */
  	KEYC_PASTE_START,
  	KEYC_PASTE_END,
  
  	/* Mouse keys. */
  	KEYC_MOUSE, /* unclassified mouse event */
  	KEYC_DRAGGING, /* dragging in progress */
  	KEYC_DOUBLECLICK, /* double click complete */
  	KEYC_MOUSE_KEY(MOUSEMOVE),
  	KEYC_MOUSE_KEY(MOUSEDOWN1),
  	KEYC_MOUSE_KEY(MOUSEDOWN2),
  	KEYC_MOUSE_KEY(MOUSEDOWN3),
  	KEYC_MOUSE_KEY(MOUSEUP1),
  	KEYC_MOUSE_KEY(MOUSEUP2),
  	KEYC_MOUSE_KEY(MOUSEUP3),
  	KEYC_MOUSE_KEY(MOUSEDRAG1),
  	KEYC_MOUSE_KEY(MOUSEDRAG2),
  	KEYC_MOUSE_KEY(MOUSEDRAG3),
  	KEYC_MOUSE_KEY(MOUSEDRAGEND1),
  	KEYC_MOUSE_KEY(MOUSEDRAGEND2),
  	KEYC_MOUSE_KEY(MOUSEDRAGEND3),
  	KEYC_MOUSE_KEY(WHEELUP),
  	KEYC_MOUSE_KEY(WHEELDOWN),
  	KEYC_MOUSE_KEY(SECONDCLICK1),
  	KEYC_MOUSE_KEY(SECONDCLICK2),
  	KEYC_MOUSE_KEY(SECONDCLICK3),
  	KEYC_MOUSE_KEY(DOUBLECLICK1),
  	KEYC_MOUSE_KEY(DOUBLECLICK2),
  	KEYC_MOUSE_KEY(DOUBLECLICK3),
  	KEYC_MOUSE_KEY(TRIPLECLICK1),
  	KEYC_MOUSE_KEY(TRIPLECLICK2),
  	KEYC_MOUSE_KEY(TRIPLECLICK3),
  
  	/* Backspace key. */
  	KEYC_BSPACE,
  
  	/* Function keys. */
  	KEYC_F1,
  	KEYC_F2,
  	KEYC_F3,
  	KEYC_F4,
  	KEYC_F5,
  	KEYC_F6,
  	KEYC_F7,
  	KEYC_F8,
  	KEYC_F9,
  	KEYC_F10,
  	KEYC_F11,
  	KEYC_F12,
  	KEYC_IC,
  	KEYC_DC,
  	KEYC_HOME,
  	KEYC_END,
  	KEYC_NPAGE,
  	KEYC_PPAGE,
  	KEYC_BTAB,
  
  	/* Arrow keys. */
  	KEYC_UP,
  	KEYC_DOWN,
  	KEYC_LEFT,
  	KEYC_RIGHT,
  
  	/* Numeric keypad. */
  	KEYC_KP_SLASH,
  	KEYC_KP_STAR,
  	KEYC_KP_MINUS,
  	KEYC_KP_SEVEN,
  	KEYC_KP_EIGHT,
  	KEYC_KP_NINE,
  	KEYC_KP_PLUS,
  	KEYC_KP_FOUR,
  	KEYC_KP_FIVE,
  	KEYC_KP_SIX,
  	KEYC_KP_ONE,
  	KEYC_KP_TWO,
  	KEYC_KP_THREE,
  	KEYC_KP_ENTER,
  	KEYC_KP_ZERO,
  	KEYC_KP_PERIOD,
  };
  
  /* Termcap codes. */
  enum tty_code_code {
  	TTYC_ACSC,
  	TTYC_AM,
  	TTYC_AX,
  	TTYC_BCE,
  	TTYC_BEL,
  	TTYC_BLINK,
  	TTYC_BOLD,
  	TTYC_CIVIS,
  	TTYC_CLEAR,
  	TTYC_CLMG,
  	TTYC_CMG,
  	TTYC_CNORM,
  	TTYC_COLORS,
  	TTYC_CR,
  	TTYC_CS,
  	TTYC_CSR,
  	TTYC_CUB,
  	TTYC_CUB1,
  	TTYC_CUD,
  	TTYC_CUD1,
  	TTYC_CUF,
  	TTYC_CUF1,
  	TTYC_CUP,
  	TTYC_CUU,
  	TTYC_CUU1,
  	TTYC_CVVIS,
  	TTYC_DCH,
  	TTYC_DCH1,
  	TTYC_DIM,
  	TTYC_DL,
  	TTYC_DL1,
  	TTYC_DSBP,
  	TTYC_DSEKS,
  	TTYC_DSFCS,
  	TTYC_DSMG,
  	TTYC_E3,
  	TTYC_ECH,
  	TTYC_ED,
  	TTYC_EL,
  	TTYC_EL1,
  	TTYC_ENACS,
  	TTYC_ENBP,
  	TTYC_ENEKS,
  	TTYC_ENFCS,
  	TTYC_ENMG,
  	TTYC_FSL,
  	TTYC_HOME,
  	TTYC_HPA,
  	TTYC_ICH,
  	TTYC_ICH1,
  	TTYC_IL,
  	TTYC_IL1,
  	TTYC_INDN,
  	TTYC_INVIS,
  	TTYC_KCBT,
  	TTYC_KCUB1,
  	TTYC_KCUD1,
  	TTYC_KCUF1,
  	TTYC_KCUU1,
  	TTYC_KDC2,
  	TTYC_KDC3,
  	TTYC_KDC4,
  	TTYC_KDC5,
  	TTYC_KDC6,
  	TTYC_KDC7,
  	TTYC_KDCH1,
  	TTYC_KDN2,
  	TTYC_KDN3,
  	TTYC_KDN4,
  	TTYC_KDN5,
  	TTYC_KDN6,
  	TTYC_KDN7,
  	TTYC_KEND,
  	TTYC_KEND2,
  	TTYC_KEND3,
  	TTYC_KEND4,
  	TTYC_KEND5,
  	TTYC_KEND6,
  	TTYC_KEND7,
  	TTYC_KF1,
  	TTYC_KF10,
  	TTYC_KF11,
  	TTYC_KF12,
  	TTYC_KF13,
  	TTYC_KF14,
  	TTYC_KF15,
  	TTYC_KF16,
  	TTYC_KF17,
  	TTYC_KF18,
  	TTYC_KF19,
  	TTYC_KF2,
  	TTYC_KF20,
  	TTYC_KF21,
  	TTYC_KF22,
  	TTYC_KF23,
  	TTYC_KF24,
  	TTYC_KF25,
  	TTYC_KF26,
  	TTYC_KF27,
  	TTYC_KF28,
  	TTYC_KF29,
  	TTYC_KF3,
  	TTYC_KF30,
  	TTYC_KF31,
  	TTYC_KF32,
  	TTYC_KF33,
  	TTYC_KF34,
  	TTYC_KF35,
  	TTYC_KF36,
  	TTYC_KF37,
  	TTYC_KF38,
  	TTYC_KF39,
  	TTYC_KF4,
  	TTYC_KF40,
  	TTYC_KF41,
  	TTYC_KF42,
  	TTYC_KF43,
  	TTYC_KF44,
  	TTYC_KF45,
  	TTYC_KF46,
  	TTYC_KF47,
  	TTYC_KF48,
  	TTYC_KF49,
  	TTYC_KF5,
  	TTYC_KF50,
  	TTYC_KF51,
  	TTYC_KF52,
  	TTYC_KF53,
  	TTYC_KF54,
  	TTYC_KF55,
  	TTYC_KF56,
  	TTYC_KF57,
  	TTYC_KF58,
  	TTYC_KF59,
  	TTYC_KF6,
  	TTYC_KF60,
  	TTYC_KF61,
  	TTYC_KF62,
  	TTYC_KF63,
  	TTYC_KF7,
  	TTYC_KF8,
  	TTYC_KF9,
  	TTYC_KHOM2,
  	TTYC_KHOM3,
  	TTYC_KHOM4,
  	TTYC_KHOM5,
  	TTYC_KHOM6,
  	TTYC_KHOM7,
  	TTYC_KHOME,
  	TTYC_KIC2,
  	TTYC_KIC3,
  	TTYC_KIC4,
  	TTYC_KIC5,
  	TTYC_KIC6,
  	TTYC_KIC7,
  	TTYC_KICH1,
  	TTYC_KIND,
  	TTYC_KLFT2,
  	TTYC_KLFT3,
  	TTYC_KLFT4,
  	TTYC_KLFT5,
  	TTYC_KLFT6,
  	TTYC_KLFT7,
  	TTYC_KMOUS,
  	TTYC_KNP,
  	TTYC_KNXT2,
  	TTYC_KNXT3,
  	TTYC_KNXT4,
  	TTYC_KNXT5,
  	TTYC_KNXT6,
  	TTYC_KNXT7,
  	TTYC_KPP,
  	TTYC_KPRV2,
  	TTYC_KPRV3,
  	TTYC_KPRV4,
  	TTYC_KPRV5,
  	TTYC_KPRV6,
  	TTYC_KPRV7,
  	TTYC_KRI,
  	TTYC_KRIT2,
  	TTYC_KRIT3,
  	TTYC_KRIT4,
  	TTYC_KRIT5,
  	TTYC_KRIT6,
  	TTYC_KRIT7,
  	TTYC_KUP2,
  	TTYC_KUP3,
  	TTYC_KUP4,
  	TTYC_KUP5,
  	TTYC_KUP6,
  	TTYC_KUP7,
  	TTYC_MS,
  	TTYC_OL,
  	TTYC_OP,
  	TTYC_REV,
  	TTYC_RGB,
  	TTYC_RI,
  	TTYC_RIN,
  	TTYC_RMACS,
  	TTYC_RMCUP,
  	TTYC_RMKX,
  	TTYC_SE,
  	TTYC_SETAB,
  	TTYC_SETAF,
  	TTYC_SETAL,
  	TTYC_SETRGBB,
  	TTYC_SETRGBF,
  	TTYC_SETULC,
  	TTYC_SGR0,
  	TTYC_SITM,
  	TTYC_SMACS,
  	TTYC_SMCUP,
  	TTYC_SMKX,
  	TTYC_SMOL,
  	TTYC_SMSO,
  	TTYC_SMUL,
  	TTYC_SMULX,
  	TTYC_SMXX,
  	TTYC_SS,
  	TTYC_SYNC,
  	TTYC_TC,
  	TTYC_TSL,
  	TTYC_U8,
  	TTYC_VPA,
  	TTYC_XT
  };
  
  /* Message codes. */
  enum msgtype {
  	MSG_VERSION = 12,
  
  	MSG_IDENTIFY_FLAGS = 100,
  	MSG_IDENTIFY_TERM,
  	MSG_IDENTIFY_TTYNAME,
  	MSG_IDENTIFY_OLDCWD, /* unused */
  	MSG_IDENTIFY_STDIN,
  	MSG_IDENTIFY_ENVIRON,
  	MSG_IDENTIFY_DONE,
  	MSG_IDENTIFY_CLIENTPID,
  	MSG_IDENTIFY_CWD,
  	MSG_IDENTIFY_FEATURES,
  	MSG_IDENTIFY_STDOUT,
  	MSG_IDENTIFY_LONGFLAGS,
  
  	MSG_COMMAND = 200,
  	MSG_DETACH,
  	MSG_DETACHKILL,
  	MSG_EXIT,
  	MSG_EXITED,
  	MSG_EXITING,
  	MSG_LOCK,
  	MSG_READY,
  	MSG_RESIZE,
  	MSG_SHELL,
  	MSG_SHUTDOWN,
  	MSG_OLDSTDERR, /* unused */
  	MSG_OLDSTDIN, /* unused */
  	MSG_OLDSTDOUT, /* unused */
  	MSG_SUSPEND,
  	MSG_UNLOCK,
  	MSG_WAKEUP,
  	MSG_EXEC,
  	MSG_FLAGS,
  
  	MSG_READ_OPEN = 300,
  	MSG_READ,
  	MSG_READ_DONE,
  	MSG_WRITE_OPEN,
  	MSG_WRITE,
  	MSG_WRITE_READY,
  	MSG_WRITE_CLOSE
  };
  
  /*
   * Message data.
   *
   * Don't forget to bump PROTOCOL_VERSION if any of these change!
   */
  struct msg_command {
  	int	argc;
  }; /* followed by packed argv */
  
  struct msg_read_open {
  	int	stream;
  	int	fd;
  }; /* followed by path */
  
  struct msg_read_data {
  	int	stream;
  };
  
  struct msg_read_done {
  	int	stream;
  	int	error;
  };
  
  struct msg_write_open {
  	int	stream;
  	int	fd;
  	int	flags;
  }; /* followed by path */
  
  struct msg_write_data {
  	int	stream;
  }; /* followed by data */
  
  struct msg_write_ready {
  	int	stream;
  	int	error;
  };
  
  struct msg_write_close {
  	int	stream;
  };
  
  /* Mode keys. */
  #define MODEKEY_EMACS 0
  #define MODEKEY_VI 1
  
  /* Modes. */
  #define MODE_CURSOR 0x1
  #define MODE_INSERT 0x2
  #define MODE_KCURSOR 0x4
  #define MODE_KKEYPAD 0x8
  #define MODE_WRAP 0x10
  #define MODE_MOUSE_STANDARD 0x20
  #define MODE_MOUSE_BUTTON 0x40
  #define MODE_BLINKING 0x80
  #define MODE_MOUSE_UTF8 0x100
  #define MODE_MOUSE_SGR 0x200
  #define MODE_BRACKETPASTE 0x400
  #define MODE_FOCUSON 0x800
  #define MODE_MOUSE_ALL 0x1000
  #define MODE_ORIGIN 0x2000
  #define MODE_CRLF 0x4000
  #define MODE_KEXTENDED 0x8000
  
  #define ALL_MODES 0xffffff
  #define ALL_MOUSE_MODES (MODE_MOUSE_STANDARD|MODE_MOUSE_BUTTON|MODE_MOUSE_ALL)
  #define MOTION_MOUSE_MODES (MODE_MOUSE_BUTTON|MODE_MOUSE_ALL)
  
  /* A single UTF-8 character. */
  typedef u_int utf8_char;
  
  /*
   * An expanded UTF-8 character. UTF8_SIZE must be big enough to hold combining
   * characters as well. It can't be more than 32 bytes without changes to how
   * characters are stored.
   */
  #define UTF8_SIZE 21
  struct utf8_data {
  	u_char	data[UTF8_SIZE];
  
  	u_char	have;
  	u_char	size;
  
  	u_char	width;	/* 0xff if invalid */
  };
  enum utf8_state {
  	UTF8_MORE,
  	UTF8_DONE,
  	UTF8_ERROR
  };
  
  /* Colour flags. */
  #define COLOUR_FLAG_256 0x01000000
  #define COLOUR_FLAG_RGB 0x02000000
  
  /* Special colours. */
  #define COLOUR_DEFAULT(c) ((c) == 8 || (c) == 9)
  
  /* Grid attributes. Anything above 0xff is stored in an extended cell. */
  #define GRID_ATTR_BRIGHT 0x1
  #define GRID_ATTR_DIM 0x2
  #define GRID_ATTR_UNDERSCORE 0x4
  #define GRID_ATTR_BLINK 0x8
  #define GRID_ATTR_REVERSE 0x10
  #define GRID_ATTR_HIDDEN 0x20
  #define GRID_ATTR_ITALICS 0x40
  #define GRID_ATTR_CHARSET 0x80	/* alternative character set */
  #define GRID_ATTR_STRIKETHROUGH 0x100
  #define GRID_ATTR_UNDERSCORE_2 0x200
  #define GRID_ATTR_UNDERSCORE_3 0x400
  #define GRID_ATTR_UNDERSCORE_4 0x800
  #define GRID_ATTR_UNDERSCORE_5 0x1000
  #define GRID_ATTR_OVERLINE 0x2000
  
  /* All underscore attributes. */
  #define GRID_ATTR_ALL_UNDERSCORE \
  	(GRID_ATTR_UNDERSCORE|	 \
  	 GRID_ATTR_UNDERSCORE_2| \
  	 GRID_ATTR_UNDERSCORE_3| \
  	 GRID_ATTR_UNDERSCORE_4| \
  	 GRID_ATTR_UNDERSCORE_5)
  
  /* Grid flags. */
  #define GRID_FLAG_FG256 0x1
  #define GRID_FLAG_BG256 0x2
  #define GRID_FLAG_PADDING 0x4
  #define GRID_FLAG_EXTENDED 0x8
  #define GRID_FLAG_SELECTED 0x10
  #define GRID_FLAG_NOPALETTE 0x20
  #define GRID_FLAG_CLEARED 0x40
  
  /* Grid line flags. */
  #define GRID_LINE_WRAPPED 0x1
  #define GRID_LINE_EXTENDED 0x2
  #define GRID_LINE_DEAD 0x4
  
  /* Grid cell data. */
  struct grid_cell {
  	struct utf8_data	data;
  	u_short			attr;
  	u_char			flags;
  	int			fg;
  	int			bg;
  	int			us;
  };
  
  /* Grid extended cell entry. */
  struct grid_extd_entry {
  	utf8_char		data;
  	u_short			attr;
  	u_char			flags;
  	int			fg;
  	int			bg;
  	int			us;
  } __packed;
  
  /* Grid cell entry. */
  struct grid_cell_entry {
  	u_char			flags;
  	union {
  		u_int		offset;
  		struct {
  			u_char	attr;
  			u_char	fg;
  			u_char	bg;
  			u_char	data;
  		} data;
  	};
  } __packed;
  
  /* Grid line. */
  struct grid_line {
  	u_int			 cellused;
  	u_int			 cellsize;
  	struct grid_cell_entry	*celldata;
  
  	u_int			 extdsize;
  	struct grid_extd_entry	*extddata;
  
  	int			 flags;
  } __packed;
  
  /* Entire grid of cells. */
  struct grid {
  	int			 flags;
  #define GRID_HISTORY 0x1 /* scroll lines into history */
  
  	u_int			 sx;
  	u_int			 sy;
  
  	u_int			 hscrolled;
  	u_int			 hsize;
  	u_int			 hlimit;
  
  	struct grid_line	*linedata;
  };
  
  /* Style alignment. */
  enum style_align {
  	STYLE_ALIGN_DEFAULT,
  	STYLE_ALIGN_LEFT,
  	STYLE_ALIGN_CENTRE,
  	STYLE_ALIGN_RIGHT
  };
  
  /* Style list. */
  enum style_list {
  	STYLE_LIST_OFF,
  	STYLE_LIST_ON,
  	STYLE_LIST_FOCUS,
  	STYLE_LIST_LEFT_MARKER,
  	STYLE_LIST_RIGHT_MARKER,
  };
  
  /* Style range. */
  enum style_range_type {
  	STYLE_RANGE_NONE,
  	STYLE_RANGE_LEFT,
  	STYLE_RANGE_RIGHT,
  	STYLE_RANGE_WINDOW
  };
  struct style_range {
  	enum style_range_type	 type;
  	u_int			 argument;
  
  	u_int			 start;
  	u_int			 end; /* not included */
  
  	TAILQ_ENTRY(style_range) entry;
  };
  TAILQ_HEAD(style_ranges, style_range);
  
  /* Style default. */
  enum style_default_type {
  	STYLE_DEFAULT_BASE,
  	STYLE_DEFAULT_PUSH,
  	STYLE_DEFAULT_POP
  };
  
  /* Style option. */
  struct style {
  	struct grid_cell	gc;
  	int			ignore;
  
  	int			fill;
  	enum style_align	align;
  	enum style_list		list;
  
  	enum style_range_type	range_type;
  	u_int			range_argument;
  
  	enum style_default_type	default_type;
  };
  
  /* Virtual screen. */
  struct screen_sel;
  struct screen_titles;
  struct screen {
  	char			*title;
  	char			*path;
  	struct screen_titles	*titles;
  
  	struct grid		*grid;		/* grid data */
  
  	u_int			 cx;		/* cursor x */
  	u_int			 cy;		/* cursor y */
  
  	u_int			 cstyle;	/* cursor style */
  	char			*ccolour;	/* cursor colour string */
  
  	u_int			 rupper;	/* scroll region top */
  	u_int			 rlower;	/* scroll region bottom */
  
  	int			 mode;
  
  	u_int			 saved_cx;
  	u_int			 saved_cy;
  	struct grid		*saved_grid;
  	struct grid_cell	 saved_cell;
  	int			 saved_flags;
  
  	bitstr_t		*tabs;
  	struct screen_sel	*sel;
  
  	struct screen_write_collect_line *write_list;
  };
  
  /* Screen write context. */
  typedef void (*screen_write_init_ctx_cb)(struct screen_write_ctx *,
      struct tty_ctx *);
  struct screen_write_ctx {
  	struct window_pane	*wp;
  	struct screen		*s;
  
  	int			 flags;
  #define SCREEN_WRITE_SYNC 0x1
  
  	screen_write_init_ctx_cb init_ctx_cb;
  	void			*arg;
  
  	struct screen_write_collect_item *item;
  	u_int			 scrolled;
  	u_int			 bg;
  
  	u_int			 cells;
  	u_int			 written;
  	u_int			 skipped;
  };
  
  /* Screen redraw context. */
  struct screen_redraw_ctx {
  	struct client	*c;
  
  	u_int		 statuslines;
  	int		 statustop;
  
  	int		 pane_status;
  	int		 pane_lines;
  
  	u_int		 sx;
  	u_int		 sy;
  	u_int		 ox;
  	u_int		 oy;
  };
  
  /* Screen size. */
  #define screen_size_x(s) ((s)->grid->sx)
  #define screen_size_y(s) ((s)->grid->sy)
  #define screen_hsize(s) ((s)->grid->hsize)
  #define screen_hlimit(s) ((s)->grid->hlimit)
  
  /* Menu. */
  struct menu_item {
  	const char	*name;
  	key_code	 key;
  	const char	*command;
  };
  struct menu {
  	const char		*title;
  	struct menu_item	*items;
  	u_int			 count;
  	u_int			 width;
  };
  typedef void (*menu_choice_cb)(struct menu *, u_int, key_code, void *);
  
  /*
   * Window mode. Windows can be in several modes and this is used to call the
   * right function to handle input and output.
   */
  struct window_mode_entry;
  struct window_mode {
  	const char	*name;
  	const char	*default_format;
  
  	struct screen	*(*init)(struct window_mode_entry *,
  			     struct cmd_find_state *, struct args *);
  	void		 (*free)(struct window_mode_entry *);
  	void		 (*resize)(struct window_mode_entry *, u_int, u_int);
  	void		 (*key)(struct window_mode_entry *, struct client *,
  			     struct session *, struct winlink *, key_code,
  			     struct mouse_event *);
  
  	const char	*(*key_table)(struct window_mode_entry *);
  	void		 (*command)(struct window_mode_entry *, struct client *,
  			     struct session *, struct winlink *, struct args *,
  			     struct mouse_event *);
  	void		 (*formats)(struct window_mode_entry *,
  			     struct format_tree *);
  };
  
  /* Active window mode. */
  struct window_mode_entry {
  	struct window_pane		*wp;
  	struct window_pane		*swp;
  
  	const struct window_mode	*mode;
  	void				*data;
  
  	struct screen			*screen;
  	u_int				 prefix;
  
  	TAILQ_ENTRY (window_mode_entry)	 entry;
  };
  
  /* Offsets into pane buffer. */
  struct window_pane_offset {
  	size_t	used;
  };
  
  /* Child window structure. */
  struct window_pane {
  	u_int		 id;
  	u_int		 active_point;
  
  	struct window	*window;
  	struct options	*options;
  
  	struct layout_cell *layout_cell;
  	struct layout_cell *saved_layout_cell;
  
  	u_int		 sx;
  	u_int		 sy;
  
  	u_int		 xoff;
  	u_int		 yoff;
  
  	int		 fg;
  	int		 bg;
  
  	int		 flags;
  #define PANE_REDRAW 0x1
  #define PANE_DROP 0x2
  #define PANE_FOCUSED 0x4
  #define PANE_RESIZE 0x8
  #define PANE_RESIZEFORCE 0x10
  #define PANE_FOCUSPUSH 0x20
  #define PANE_INPUTOFF 0x40
  #define PANE_CHANGED 0x80
  #define PANE_EXITED 0x100
  #define PANE_STATUSREADY 0x200
  #define PANE_STATUSDRAWN 0x400
  #define PANE_EMPTY 0x800
  #define PANE_STYLECHANGED 0x1000
  #define PANE_RESIZENOW 0x2000
  
  	int		 argc;
  	char	       **argv;
  	char		*shell;
  	char		*cwd;
  
  	pid_t		 pid;
  	char		 tty[TTY_NAME_MAX];
  	int		 status;
  
  	int		 fd;
  	struct bufferevent *event;
  
  	struct window_pane_offset offset;
  	size_t		 base_offset;
  
  	struct event	 resize_timer;
  	struct event	 force_timer;
  
  	struct input_ctx *ictx;
  
  	struct grid_cell cached_gc;
  	struct grid_cell cached_active_gc;
  	int		*palette;
  
  	int		 pipe_fd;
  	struct bufferevent *pipe_event;
  	struct window_pane_offset pipe_offset;
  
  	struct screen	*screen;
  	struct screen	 base;
  
  	struct screen	 status_screen;
  	size_t		 status_size;
  
  	TAILQ_HEAD (, window_mode_entry) modes;
  
  	char		*searchstr;
  	int		 searchregex;
  
  	size_t		 written;
  	size_t		 skipped;
  
  	int		 border_gc_set;
  	struct grid_cell border_gc;
  
  	TAILQ_ENTRY(window_pane) entry;
  	RB_ENTRY(window_pane) tree_entry;
  };
  TAILQ_HEAD(window_panes, window_pane);
  RB_HEAD(window_pane_tree, window_pane);
  
  /* Window structure. */
  struct window {
  	u_int		 id;
  	void		*latest;
  
  	char		*name;
  	struct event	 name_event;
  	struct timeval	 name_time;
  
  	struct event	 alerts_timer;
  	struct event	 offset_timer;
  
  	struct timeval	 activity_time;
  
  	struct window_pane *active;
  	struct window_pane *last;
  	struct window_panes panes;
  
  	int		 lastlayout;
  	struct layout_cell *layout_root;
  	struct layout_cell *saved_layout_root;
  	char		*old_layout;
  
  	u_int		 sx;
  	u_int		 sy;
  	u_int		 xpixel;
  	u_int		 ypixel;
  
  	u_int		 new_sx;
  	u_int		 new_sy;
  	u_int		 new_xpixel;
  	u_int		 new_ypixel;
  
  	int		 flags;
  #define WINDOW_BELL 0x1
  #define WINDOW_ACTIVITY 0x2
  #define WINDOW_SILENCE 0x4
  #define WINDOW_ZOOMED 0x8
  #define WINDOW_WASZOOMED 0x10
  #define WINDOW_RESIZE 0x20
  #define WINDOW_ALERTFLAGS (WINDOW_BELL|WINDOW_ACTIVITY|WINDOW_SILENCE)
  
  	int		 alerts_queued;
  	TAILQ_ENTRY(window) alerts_entry;
  
  	struct options	*options;
  
  	u_int		 references;
  	TAILQ_HEAD(, winlink) winlinks;
  
  	RB_ENTRY(window) entry;
  };
  RB_HEAD(windows, window);
  
  /* Entry on local window list. */
  struct winlink {
  	int		 idx;
  	struct session	*session;
  	struct window	*window;
  
  	int		 flags;
  #define WINLINK_BELL 0x1
  #define WINLINK_ACTIVITY 0x2
  #define WINLINK_SILENCE 0x4
  #define WINLINK_ALERTFLAGS (WINLINK_BELL|WINLINK_ACTIVITY|WINLINK_SILENCE)
  
  	RB_ENTRY(winlink) entry;
  	TAILQ_ENTRY(winlink) wentry;
  	TAILQ_ENTRY(winlink) sentry;
  };
  RB_HEAD(winlinks, winlink);
  TAILQ_HEAD(winlink_stack, winlink);
  
  /* Window size option. */
  #define WINDOW_SIZE_LARGEST 0
  #define WINDOW_SIZE_SMALLEST 1
  #define WINDOW_SIZE_MANUAL 2
  #define WINDOW_SIZE_LATEST 3
  
  /* Pane border status option. */
  #define PANE_STATUS_OFF 0
  #define PANE_STATUS_TOP 1
  #define PANE_STATUS_BOTTOM 2
  
  /* Pane border lines option. */
  #define PANE_LINES_SINGLE 0
  #define PANE_LINES_DOUBLE 1
  #define PANE_LINES_HEAVY 2
  #define PANE_LINES_SIMPLE 3
  #define PANE_LINES_NUMBER 4
  
  /* Layout direction. */
  enum layout_type {
  	LAYOUT_LEFTRIGHT,
  	LAYOUT_TOPBOTTOM,
  	LAYOUT_WINDOWPANE
  };
  
  /* Layout cells queue. */
  TAILQ_HEAD(layout_cells, layout_cell);
  
  /* Layout cell. */
  struct layout_cell {
  	enum layout_type type;
  
  	struct layout_cell *parent;
  
  	u_int		 sx;
  	u_int		 sy;
  
  	u_int		 xoff;
  	u_int		 yoff;
  
  	struct window_pane *wp;
  	struct layout_cells cells;
  
  	TAILQ_ENTRY(layout_cell) entry;
  };
  
  /* Environment variable. */
  struct environ_entry {
  	char		*name;
  	char		*value;
  
  	int		 flags;
  #define ENVIRON_HIDDEN 0x1
  
  	RB_ENTRY(environ_entry) entry;
  };
  
  /* Client session. */
  struct session_group {
  	const char		*name;
  	TAILQ_HEAD(, session)	 sessions;
  
  	RB_ENTRY(session_group)	 entry;
  };
  RB_HEAD(session_groups, session_group);
  
  struct session {
  	u_int		 id;
  
  	char		*name;
  	const char	*cwd;
  
  	struct timeval	 creation_time;
  	struct timeval	 last_attached_time;
  	struct timeval	 activity_time;
  	struct timeval	 last_activity_time;
  
  	struct event	 lock_timer;
  
  	struct winlink	*curw;
  	struct winlink_stack lastw;
  	struct winlinks	 windows;
  
  	int		 statusat;
  	u_int		 statuslines;
  
  	struct options	*options;
  
  #define SESSION_PASTING 0x1
  #define SESSION_ALERTED 0x2
  	int		 flags;
  
  	u_int		 attached;
  
  	struct termios	*tio;
  
  	struct environ	*environ;
  
  	int		 references;
  
  	TAILQ_ENTRY(session) gentry;
  	RB_ENTRY(session)    entry;
  };
  RB_HEAD(sessions, session);
  
  /* Mouse button masks. */
  #define MOUSE_MASK_BUTTONS 3
  #define MOUSE_MASK_SHIFT 4
  #define MOUSE_MASK_META 8
  #define MOUSE_MASK_CTRL 16
  #define MOUSE_MASK_DRAG 32
  #define MOUSE_MASK_WHEEL 64
  
  /* Mouse wheel states. */
  #define MOUSE_WHEEL_UP 0
  #define MOUSE_WHEEL_DOWN 1
  
  /* Mouse helpers. */
  #define MOUSE_BUTTONS(b) ((b) & MOUSE_MASK_BUTTONS)
  #define MOUSE_WHEEL(b) ((b) & MOUSE_MASK_WHEEL)
  #define MOUSE_DRAG(b) ((b) & MOUSE_MASK_DRAG)
  #define MOUSE_RELEASE(b) (((b) & MOUSE_MASK_BUTTONS) == 3)
  
  /* Mouse input. */
  struct mouse_event {
  	int		valid;
  	int		ignore;
  
  	key_code	key;
  
  	int		statusat;
  	u_int		statuslines;
  
  	u_int		x;
  	u_int		y;
  	u_int		b;
  
  	u_int		lx;
  	u_int		ly;
  	u_int		lb;
  
  	u_int		ox;
  	u_int		oy;
  
  	int		s;
  	int		w;
  	int		wp;
  
  	u_int		sgr_type;
  	u_int		sgr_b;
  };
  
  /* Key event. */
  struct key_event {
  	key_code		key;
  	struct mouse_event	m;
  };
  
  /* TTY information. */
  struct tty_key {
  	char		 ch;
  	key_code	 key;
  
  	struct tty_key	*left;
  	struct tty_key	*right;
  
  	struct tty_key	*next;
  };
  
  struct tty_code;
  struct tty_term {
  	char		*name;
  	struct tty	*tty;
  	int		 features;
  
  	char		 acs[UCHAR_MAX + 1][2];
  
  	struct tty_code	*codes;
  
  #define TERM_256COLOURS 0x1
  #define TERM_NOAM 0x2
  #define TERM_DECSLRM 0x4
  #define TERM_DECFRA 0x8
  #define TERM_RGBCOLOURS 0x10
  #define TERM_VT100LIKE 0x20
  	int		 flags;
  
  	LIST_ENTRY(tty_term) entry;
  };
  LIST_HEAD(tty_terms, tty_term);
  
  struct tty {
  	struct client	*client;
  	struct event	 start_timer;
  
  	u_int		 sx;
  	u_int		 sy;
  	u_int		 xpixel;
  	u_int		 ypixel;
  
  	u_int		 cx;
  	u_int		 cy;
  	u_int		 cstyle;
  	char		*ccolour;
  
  	int		 oflag;
  	u_int		 oox;
  	u_int		 ooy;
  	u_int		 osx;
  	u_int		 osy;
  
  	int		 mode;
  
  	u_int		 rlower;
  	u_int		 rupper;
  
  	u_int		 rleft;
  	u_int		 rright;
  
  	struct event	 event_in;
  	struct evbuffer	*in;
  	struct event	 event_out;
  	struct evbuffer	*out;
  	struct event	 timer;
  	size_t		 discarded;
  
  	struct termios	 tio;
  
  	struct grid_cell cell;
  	struct grid_cell last_cell;
  
  #define TTY_NOCURSOR 0x1
  #define TTY_FREEZE 0x2
  #define TTY_TIMER 0x4
  /* 0x8 unused */
  #define TTY_STARTED 0x10
  #define TTY_OPENED 0x20
  /* 0x40 unused */
  #define TTY_BLOCK 0x80
  #define TTY_HAVEDA 0x100
  #define TTY_HAVEXDA 0x200
  #define TTY_SYNCING 0x400
  	int		 flags;
  
  	struct tty_term	*term;
  
  	u_int		 mouse_last_x;
  	u_int		 mouse_last_y;
  	u_int		 mouse_last_b;
  	int		 mouse_drag_flag;
  	void		(*mouse_drag_update)(struct client *,
  			    struct mouse_event *);
  	void		(*mouse_drag_release)(struct client *,
  			    struct mouse_event *);
  
  	struct event	 key_timer;
  	struct tty_key	*key_tree;
  };
  
  /* TTY command context. */
  typedef void (*tty_ctx_redraw_cb)(const struct tty_ctx *);
  typedef int (*tty_ctx_set_client_cb)(struct tty_ctx *, struct client *);
  struct tty_ctx {
  	struct screen		*s;
  
  	tty_ctx_redraw_cb	 redraw_cb;
  	tty_ctx_set_client_cb	 set_client_cb;
  	void			*arg;
  
  	const struct grid_cell	*cell;
  	int			 wrapped;
  
  	u_int			 num;
  	void			*ptr;
  
  	/*
  	 * Cursor and region position before the screen was updated - this is
  	 * where the command should be applied; the values in the screen have
  	 * already been updated.
  	 */
  	u_int		 ocx;
  	u_int		 ocy;
  
  	u_int		 orupper;
  	u_int		 orlower;
  
  	/* Target region (usually pane) offset and size. */
  	u_int		 xoff;
  	u_int		 yoff;
  	u_int		 rxoff;
  	u_int		 ryoff;
  	u_int		 sx;
  	u_int		 sy;
  
  	/* The background colour used for clearing (erasing). */
  	u_int		 bg;
  
  	/* The default colours and palette. */
  	struct grid_cell defaults;
  	int		*palette;
  
  	/* Containing region (usually window) offset and size. */
  	int		 bigger;
  	u_int		 wox;
  	u_int		 woy;
  	u_int		 wsx;
  	u_int		 wsy;
  };
  
  /* Saved message entry. */
  struct message_entry {
  	char				*msg;
  	u_int				 msg_num;
  	struct timeval			 msg_time;
  
  	TAILQ_ENTRY(message_entry)	 entry;
  };
  TAILQ_HEAD(message_list, message_entry);
  
  /* Parsed arguments structures. */
  struct args_entry;
  RB_HEAD(args_tree, args_entry);
  struct args {
  	struct args_tree	  tree;
  	int			  argc;
  	char			**argv;
  };
  
  /* Command find structures. */
  enum cmd_find_type {
  	CMD_FIND_PANE,
  	CMD_FIND_WINDOW,
  	CMD_FIND_SESSION,
  };
  struct cmd_find_state {
  	int			 flags;
  	struct cmd_find_state	*current;
  
  	struct session		*s;
  	struct winlink		*wl;
  	struct window		*w;
  	struct window_pane	*wp;
  	int			 idx;
  };
  
  /* Command find flags. */
  #define CMD_FIND_PREFER_UNATTACHED 0x1
  #define CMD_FIND_QUIET 0x2
  #define CMD_FIND_WINDOW_INDEX 0x4
  #define CMD_FIND_DEFAULT_MARKED 0x8
  #define CMD_FIND_EXACT_SESSION 0x10
  #define CMD_FIND_EXACT_WINDOW 0x20
  #define CMD_FIND_CANFAIL 0x40
  
  /* List of commands. */
  struct cmd_list {
  	int		 references;
  	u_int		 group;
  	struct cmds	*list;
  };
  
  /* Command return values. */
  enum cmd_retval {
  	CMD_RETURN_ERROR = -1,
  	CMD_RETURN_NORMAL = 0,
  	CMD_RETURN_WAIT,
  	CMD_RETURN_STOP
  };
  
  /* Command parse result. */
  enum cmd_parse_status {
  	CMD_PARSE_EMPTY,
  	CMD_PARSE_ERROR,
  	CMD_PARSE_SUCCESS
  };
  struct cmd_parse_result {
  	enum cmd_parse_status	 status;
  	struct cmd_list		*cmdlist;
  	char			*error;
  };
  struct cmd_parse_input {
  	int			 flags;
  #define CMD_PARSE_QUIET 0x1
  #define CMD_PARSE_PARSEONLY 0x2
  #define CMD_PARSE_NOALIAS 0x4
  #define CMD_PARSE_VERBOSE 0x8
  #define CMD_PARSE_ONEGROUP 0x10
  
  	const char		*file;
  	u_int			 line;
  
  	struct cmdq_item	*item;
  	struct client		*c;
  	struct cmd_find_state	 fs;
  };
  
  /* Command queue flags. */
  #define CMDQ_STATE_REPEAT 0x1
  #define CMDQ_STATE_CONTROL 0x2
  #define CMDQ_STATE_NOHOOKS 0x4
  
  /* Command queue callback. */
  typedef enum cmd_retval (*cmdq_cb) (struct cmdq_item *, void *);
  
  /* Command definition flag. */
  struct cmd_entry_flag {
  	char			 flag;
  	enum cmd_find_type	 type;
  	int			 flags;
  };
  
  /* Command definition. */
  struct cmd_entry {
  	const char		*name;
  	const char		*alias;
  
  	struct {
  		const char	*template;
  		int		 lower;
  		int		 upper;
  	} args;
  	const char		*usage;
  
  	struct cmd_entry_flag	 source;
  	struct cmd_entry_flag	 target;
  
  #define CMD_STARTSERVER 0x1
  #define CMD_READONLY 0x2
  #define CMD_AFTERHOOK 0x4
  #define CMD_CLIENT_CFLAG 0x8
  #define CMD_CLIENT_TFLAG 0x10
  #define CMD_CLIENT_CANFAIL 0x20
  	int		 flags;
  
  	enum cmd_retval	 (*exec)(struct cmd *, struct cmdq_item *);
  };
  
  /* Status line. */
  #define STATUS_LINES_LIMIT 5
  struct status_line_entry {
  	char			*expanded;
  	struct style_ranges	 ranges;
  };
  struct status_line {
  	struct event		 timer;
  
  	struct screen		 screen;
  	struct screen		*active;
  	int			 references;
  
  	struct grid_cell	 style;
  	struct status_line_entry entries[STATUS_LINES_LIMIT];
  };
  
  /* File in client. */
  typedef void (*client_file_cb) (struct client *, const char *, int, int,
      struct evbuffer *, void *);
  struct client_file {
  	struct client			*c;
  	int				 references;
  	int				 stream;
  
  	char				*path;
  	struct evbuffer			*buffer;
  	struct bufferevent		*event;
  
  	int				 fd;
  	int				 error;
  	int				 closed;
  
  	client_file_cb			 cb;
  	void				*data;
  
  	RB_ENTRY(client_file)		 entry;
  };
  RB_HEAD(client_files, client_file);
  
  /* Client window. */
  struct client_window {
  	u_int			 window;
  	struct window_pane	*pane;
  	RB_ENTRY(client_window)	 entry;
  };
  RB_HEAD(client_windows, client_window);
  
  /* Client connection. */
  typedef int (*prompt_input_cb)(struct client *, void *, const char *, int);
  typedef void (*prompt_free_cb)(void *);
  typedef int (*overlay_check_cb)(struct client *, u_int, u_int);
  typedef struct screen *(*overlay_mode_cb)(struct client *, u_int *, u_int *);
  typedef void (*overlay_draw_cb)(struct client *, struct screen_redraw_ctx *);
  typedef int (*overlay_key_cb)(struct client *, struct key_event *);
  typedef void (*overlay_free_cb)(struct client *);
  struct client {
  	const char	*name;
  	struct tmuxpeer	*peer;
  	struct cmdq_list *queue;
  
  	struct client_windows windows;
  
  	struct control_state *control_state;
  	u_int		 pause_age;
  
  	pid_t		 pid;
  	int		 fd;
  	int		 out_fd;
  	struct event	 event;
  	int		 retval;
  
  	struct timeval	 creation_time;
  	struct timeval	 activity_time;
  
  	struct environ	*environ;
  	struct format_job_tree	*jobs;
  
  	char		*title;
  	const char	*cwd;
  
  	char		*term_name;
  	int		 term_features;
  	char		*term_type;
  
  	char		*ttyname;
  	struct tty	 tty;
  
  	size_t		 written;
  	size_t		 discarded;
  	size_t		 redraw;
  
  	struct event	 repeat_timer;
  
  	struct event	 click_timer;
  	u_int		 click_button;
  	struct mouse_event click_event;
  
  	struct status_line status;
  
  #define CLIENT_TERMINAL 0x1
  #define CLIENT_LOGIN 0x2
  #define CLIENT_EXIT 0x4
  #define CLIENT_REDRAWWINDOW 0x8
  #define CLIENT_REDRAWSTATUS 0x10
  #define CLIENT_REPEAT 0x20
  #define CLIENT_SUSPENDED 0x40
  #define CLIENT_ATTACHED 0x80
  #define CLIENT_EXITED 0x100
  #define CLIENT_DEAD 0x200
  #define CLIENT_REDRAWBORDERS 0x400
  #define CLIENT_READONLY 0x800
  /* 0x1000 unused */
  #define CLIENT_CONTROL 0x2000
  #define CLIENT_CONTROLCONTROL 0x4000
  #define CLIENT_FOCUSED 0x8000
  #define CLIENT_UTF8 0x10000
  #define CLIENT_IGNORESIZE 0x20000
  #define CLIENT_IDENTIFIED 0x40000
  #define CLIENT_STATUSFORCE 0x80000
  #define CLIENT_DOUBLECLICK 0x100000
  #define CLIENT_TRIPLECLICK 0x200000
  #define CLIENT_SIZECHANGED 0x400000
  #define CLIENT_STATUSOFF 0x800000
  #define CLIENT_REDRAWSTATUSALWAYS 0x1000000
  #define CLIENT_REDRAWOVERLAY 0x2000000
  #define CLIENT_CONTROL_NOOUTPUT 0x4000000
  #define CLIENT_DEFAULTSOCKET 0x8000000
  #define CLIENT_STARTSERVER 0x10000000
  #define CLIENT_REDRAWPANES 0x20000000
  #define CLIENT_NOFORK 0x40000000
  #define CLIENT_ACTIVEPANE 0x80000000ULL
  #define CLIENT_CONTROL_PAUSEAFTER 0x100000000ULL
  #define CLIENT_CONTROL_WAITEXIT 0x200000000ULL
  #define CLIENT_ALLREDRAWFLAGS		\
  	(CLIENT_REDRAWWINDOW|		\
  	 CLIENT_REDRAWSTATUS|		\
  	 CLIENT_REDRAWSTATUSALWAYS|	\
  	 CLIENT_REDRAWBORDERS|		\
  	 CLIENT_REDRAWOVERLAY|		\
  	 CLIENT_REDRAWPANES)
  #define CLIENT_UNATTACHEDFLAGS	\
  	(CLIENT_DEAD|		\
  	 CLIENT_SUSPENDED|	\
  	 CLIENT_EXIT)
  #define CLIENT_NOSIZEFLAGS	\
  	(CLIENT_DEAD|		\
  	 CLIENT_SUSPENDED|	\
  	 CLIENT_EXIT)
  	uint64_t	 flags;
  
  	enum {
  		CLIENT_EXIT_RETURN,
  		CLIENT_EXIT_SHUTDOWN,
  		CLIENT_EXIT_DETACH
  	}		 exit_type;
  	enum msgtype	 exit_msgtype;
  	char		*exit_session;
  	char		*exit_message;
  
  	struct key_table *keytable;
  
  	uint64_t	 redraw_panes;
  
  	int		 message_ignore_styles;
  	char		*message_string;
  	struct event	 message_timer;
  
  	char		*prompt_string;
  	struct utf8_data *prompt_buffer;
  	size_t		 prompt_index;
  	prompt_input_cb	 prompt_inputcb;
  	prompt_free_cb	 prompt_freecb;
  	void		*prompt_data;
  	u_int		 prompt_hindex;
  	enum { PROMPT_ENTRY, PROMPT_COMMAND } prompt_mode;
  	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_WINDOW 0x20
  #define PROMPT_TARGET 0x40
  	int		 prompt_flags;
  
  	struct session	*session;
  	struct session	*last_session;
  
  	int		 references;
  
  	void		*pan_window;
  	u_int		 pan_ox;
  	u_int		 pan_oy;
  
  	overlay_check_cb overlay_check;
  	overlay_mode_cb	 overlay_mode;
  	overlay_draw_cb	 overlay_draw;
  	overlay_key_cb	 overlay_key;
  	overlay_free_cb	 overlay_free;
  	void		*overlay_data;
  	struct event	 overlay_timer;
  
  	struct client_files files;
  
  	TAILQ_ENTRY(client) entry;
  };
  TAILQ_HEAD(clients, client);
  
  /* Control mode subscription type. */
  enum control_sub_type {
  	CONTROL_SUB_SESSION,
  	CONTROL_SUB_PANE,
  	CONTROL_SUB_ALL_PANES,
  	CONTROL_SUB_WINDOW,
  	CONTROL_SUB_ALL_WINDOWS
  };
  
  /* Key binding and key table. */
  struct key_binding {
  	key_code		 key;
  	struct cmd_list		*cmdlist;
  	const char		*note;
  
  	int			 flags;
  #define KEY_BINDING_REPEAT 0x1
  
  	RB_ENTRY(key_binding)	 entry;
  };
  RB_HEAD(key_bindings, key_binding);
  
  struct key_table {
  	const char		*name;
  	struct key_bindings	 key_bindings;
  	struct key_bindings	 default_key_bindings;
  
  	u_int			 references;
  
  	RB_ENTRY(key_table)	 entry;
  };
  RB_HEAD(key_tables, key_table);
  
  /* Option data. */
  RB_HEAD(options_array, options_array_item);
  union options_value {
  	char				 *string;
  	long long			  number;
  	struct style			  style;
  	struct options_array		  array;
  	struct cmd_list			 *cmdlist;
  };
  
  /* Option table entries. */
  enum options_table_type {
  	OPTIONS_TABLE_STRING,
  	OPTIONS_TABLE_NUMBER,
  	OPTIONS_TABLE_KEY,
  	OPTIONS_TABLE_COLOUR,
  	OPTIONS_TABLE_FLAG,
  	OPTIONS_TABLE_CHOICE,
  	OPTIONS_TABLE_COMMAND
  };
  
  #define OPTIONS_TABLE_NONE 0
  #define OPTIONS_TABLE_SERVER 0x1
  #define OPTIONS_TABLE_SESSION 0x2
  #define OPTIONS_TABLE_WINDOW 0x4
  #define OPTIONS_TABLE_PANE 0x8
  
  #define OPTIONS_TABLE_IS_ARRAY 0x1
  #define OPTIONS_TABLE_IS_HOOK 0x2
  #define OPTIONS_TABLE_IS_STYLE 0x4
  
  struct options_table_entry {
  	const char		 *name;
  	const char		 *alternative_name;
  	enum options_table_type	  type;
  	int			  scope;
  	int			  flags;
  
  	u_int			  minimum;
  	u_int			  maximum;
  	const char		**choices;
  
  	const char		 *default_str;
  	long long		  default_num;
  	const char		**default_arr;
  
  	const char		 *separator;
  	const char		 *pattern;
  
  	const char		 *text;
  	const char		 *unit;
  };
  
  struct options_name_map {
  	const char		*from;
  	const char		*to;
  };
  
  /* Common command usages. */
  #define CMD_TARGET_PANE_USAGE "[-t target-pane]"
  #define CMD_TARGET_WINDOW_USAGE "[-t target-window]"
  #define CMD_TARGET_SESSION_USAGE "[-t target-session]"
  #define CMD_TARGET_CLIENT_USAGE "[-t target-client]"
  #define CMD_SRCDST_PANE_USAGE "[-s src-pane] [-t dst-pane]"
  #define CMD_SRCDST_WINDOW_USAGE "[-s src-window] [-t dst-window]"
  #define CMD_SRCDST_SESSION_USAGE "[-s src-session] [-t dst-session]"
  #define CMD_SRCDST_CLIENT_USAGE "[-s src-client] [-t dst-client]"
  #define CMD_BUFFER_USAGE "[-b buffer-name]"
  
  /* Spawn common context. */
  struct spawn_context {
  	struct cmdq_item	 *item;
  
  	struct session		 *s;
  	struct winlink		 *wl;
  	struct client		 *tc;
  
  	struct window_pane	 *wp0;
  	struct layout_cell	 *lc;
  
  	const char		 *name;
  	char			**argv;
  	int			  argc;
  	struct environ		 *environ;
  
  	int			  idx;
  	const char		 *cwd;
  
  	int			  flags;
  #define SPAWN_KILL 0x1
  #define SPAWN_DETACHED 0x2
  #define SPAWN_RESPAWN 0x4
  #define SPAWN_BEFORE 0x8
  #define SPAWN_NONOTIFY 0x10
  #define SPAWN_FULLSIZE 0x20
  #define SPAWN_EMPTY 0x40
  };
  
  /* Mode tree sort order. */
  struct mode_tree_sort_criteria {
  	u_int	field;
  	int	reversed;
  };
  
  /* tmux.c */
  extern struct options	*global_options;
  extern struct options	*global_s_options;
  extern struct options	*global_w_options;
  extern struct environ	*global_environ;
  extern struct timeval	 start_time;
  extern const char	*socket_path;
  extern const char	*shell_command;
  extern int		 ptm_fd;
  extern const char	*shell_command;
  int		 checkshell(const char *);
  void		 setblocking(int, int);
  uint64_t	 get_timer(void);
  const char	*sig2name(int);
  const char	*find_cwd(void);
  const char	*find_home(void);
  const char	*getversion(void);
  void		 expand_paths(const char *, char ***, u_int *);
  
  
  /* proc.c */
  struct imsg;
  int	proc_send(struct tmuxpeer *, enum msgtype, int, const void *, size_t);
  struct tmuxproc *proc_start(const char *);
  void	proc_loop(struct tmuxproc *, int (*)(void));
  void	proc_exit(struct tmuxproc *);
  void	proc_set_signals(struct tmuxproc *, void(*)(int));
  void	proc_clear_signals(struct tmuxproc *, int);
  struct tmuxpeer *proc_add_peer(struct tmuxproc *, int,
  	    void (*)(struct imsg *, void *), void *);
  void	proc_remove_peer(struct tmuxpeer *);
  void	proc_kill_peer(struct tmuxpeer *);
  void	proc_toggle_log(struct tmuxproc *);
  
  /* cfg.c */
  extern int cfg_finished;
  extern struct client *cfg_client;
  void	start_cfg(void);
  int	load_cfg(const char *, struct client *, struct cmdq_item *, int,
  	    struct cmdq_item **);
  int	load_cfg_from_buffer(const void *, size_t, const char *,
  	    struct client *, struct cmdq_item *, int, struct cmdq_item **);
  void	set_cfg_file(const char *);
  void printflike(1, 2) cfg_add_cause(const char *, ...);
  void	cfg_print_causes(struct cmdq_item *);
  void	cfg_show_causes(struct session *);
  
  /* paste.c */
  struct paste_buffer;
  const char	*paste_buffer_name(struct paste_buffer *);
  u_int		 paste_buffer_order(struct paste_buffer *);
  time_t		 paste_buffer_created(struct paste_buffer *);
  const char	*paste_buffer_data(struct paste_buffer *, size_t *);
  struct paste_buffer *paste_walk(struct paste_buffer *);
  struct paste_buffer *paste_get_top(const char **);
  struct paste_buffer *paste_get_name(const char *);
  void		 paste_free(struct paste_buffer *);
  void		 paste_add(const char *, char *, size_t);
  int		 paste_rename(const char *, const char *, char **);
  int		 paste_set(char *, size_t, const char *, char **);
  void		 paste_replace(struct paste_buffer *, char *, size_t);
  char		*paste_make_sample(struct paste_buffer *);
  
  /* format.c */
  #define FORMAT_STATUS 0x1
  #define FORMAT_FORCE 0x2
  #define FORMAT_NOJOBS 0x4
  #define FORMAT_VERBOSE 0x8
  #define FORMAT_NONE 0
  #define FORMAT_PANE 0x80000000U
  #define FORMAT_WINDOW 0x40000000U
  struct format_tree;
  struct format_modifier;
  typedef char *(*format_cb)(struct format_tree *);
  const char	*format_skip(const char *, const char *);
  int		 format_true(const char *);
  struct format_tree *format_create(struct client *, struct cmdq_item *, int,
  		     int);
  void		 format_free(struct format_tree *);
  void		 format_merge(struct format_tree *, struct format_tree *);
  struct window_pane *format_get_pane(struct format_tree *);
  void printflike(3, 4) format_add(struct format_tree *, const char *,
  		     const char *, ...);
  void		 format_add_tv(struct format_tree *, const char *,
  		     struct timeval *);
  void		 format_add_cb(struct format_tree *, const char *, format_cb);
  void		 format_each(struct format_tree *, void (*)(const char *,
  		     const char *, void *), void *);
  char		*format_expand_time(struct format_tree *, const char *);
  char		*format_expand(struct format_tree *, const char *);
  char		*format_single(struct cmdq_item *, const char *,
  		     struct client *, struct session *, struct winlink *,
  		     struct window_pane *);
  char		*format_single_from_state(struct cmdq_item *, const char *,
  		    struct client *, struct cmd_find_state *);
  char		*format_single_from_target(struct cmdq_item *, const char *);
  struct format_tree *format_create_defaults(struct cmdq_item *, struct client *,
  		     struct session *, struct winlink *, struct window_pane *);
  struct format_tree *format_create_from_state(struct cmdq_item *,
  		     struct client *, struct cmd_find_state *);
  struct format_tree *format_create_from_target(struct cmdq_item *);
  void		 format_defaults(struct format_tree *, struct client *,
  		     struct session *, struct winlink *, struct window_pane *);
  void		 format_defaults_window(struct format_tree *, struct window *);
  void		 format_defaults_pane(struct format_tree *,
  		     struct window_pane *);
  void		 format_defaults_paste_buffer(struct format_tree *,
  		     struct paste_buffer *);
  void		 format_lost_client(struct client *);
  char		*format_grid_word(struct grid *, u_int, u_int);
  char		*format_grid_line(struct grid *, u_int);
  
  /* format-draw.c */
  void		 format_draw(struct screen_write_ctx *,
  		     const struct grid_cell *, u_int, const char *,
  		     struct style_ranges *);
  u_int		 format_width(const char *);
  char		*format_trim_left(const char *, u_int);
  char		*format_trim_right(const char *, u_int);
  
  /* notify.c */
  void	notify_hook(struct cmdq_item *, const char *);
  void	notify_client(const char *, struct client *);
  void	notify_session(const char *, struct session *);
  void	notify_winlink(const char *, struct winlink *);
  void	notify_session_window(const char *, struct session *, struct window *);
  void	notify_window(const char *, struct window *);
  void	notify_pane(const char *, struct window_pane *);
  
  /* options.c */
  struct options	*options_create(struct options *);
  void		 options_free(struct options *);
  struct options	*options_get_parent(struct options *);
  void		 options_set_parent(struct options *, struct options *);
  struct options_entry *options_first(struct options *);
  struct options_entry *options_next(struct options_entry *);
  struct options_entry *options_empty(struct options *,
  		     const struct options_table_entry *);
  struct options_entry *options_default(struct options *,
  		     const struct options_table_entry *);
  char		*options_default_to_string(const struct options_table_entry *);
  const char	*options_name(struct options_entry *);
  struct options	*options_owner(struct options_entry *);
  const struct options_table_entry *options_table_entry(struct options_entry *);
  struct options_entry *options_get_only(struct options *, const char *);
  struct options_entry *options_get(struct options *, const char *);
  void		 options_array_clear(struct options_entry *);
  union options_value *options_array_get(struct options_entry *, u_int);
  int		 options_array_set(struct options_entry *, u_int, const char *,
  		     int, char **);
  int		 options_array_assign(struct options_entry *, const char *,
  		     char **);
  struct options_array_item *options_array_first(struct options_entry *);
  struct options_array_item *options_array_next(struct options_array_item *);
  u_int		 options_array_item_index(struct options_array_item *);
  union options_value *options_array_item_value(struct options_array_item *);
  int		 options_is_array(struct options_entry *);
  int		 options_is_string(struct options_entry *);
  char		*options_to_string(struct options_entry *, int, int);
  char		*options_parse(const char *, int *);
  struct options_entry *options_parse_get(struct options *, const char *, int *,
  		     int);
  char		*options_match(const char *, int *, int *);
  struct options_entry *options_match_get(struct options *, const char *, int *,
  		     int, int *);
  const char	*options_get_string(struct options *, const char *);
  long long	 options_get_number(struct options *, const char *);
  struct options_entry * printflike(4, 5) options_set_string(struct options *,
  		     const char *, int, const char *, ...);
  struct options_entry *options_set_number(struct options *, const char *,
  		     long long);
  int		 options_scope_from_name(struct args *, int,
  		     const char *, struct cmd_find_state *, struct options **,
  		     char **);
  int		 options_scope_from_flags(struct args *, int,
  		     struct cmd_find_state *, struct options **, char **);
  struct style	*options_string_to_style(struct options *, const char *,
  		     struct format_tree *);
  int		 options_from_string(struct options *,
  		     const struct options_table_entry *, const char *,
  		     const char *, int, char **);
  void		 options_push_changes(const char *);
  int		 options_remove_or_default(struct options_entry *, int,
  		     char **);
  
  /* options-table.c */
  extern const struct options_table_entry	options_table[];
  extern const struct options_name_map	options_other_names[];
  
  /* job.c */
  typedef void (*job_update_cb) (struct job *);
  typedef void (*job_complete_cb) (struct job *);
  typedef void (*job_free_cb) (void *);
  #define JOB_NOWAIT 0x1
  #define JOB_KEEPWRITE 0x2
  #define JOB_PTY 0x4
  struct job	*job_run(const char *, struct session *, const char *,
  		     job_update_cb, job_complete_cb, job_free_cb, void *, int,
  		     int, int);
  void		 job_free(struct job *);
  void		 job_resize(struct job *, u_int, u_int);
  void		 job_check_died(pid_t, int);
  int		 job_get_status(struct job *);
  void		*job_get_data(struct job *);
  struct bufferevent *job_get_event(struct job *);
  void		 job_kill_all(void);
  int		 job_still_running(void);
  void		 job_print_summary(struct cmdq_item *, int);
  
  /* environ.c */
  struct environ *environ_create(void);
  void	environ_free(struct environ *);
  struct environ_entry *environ_first(struct environ *);
  struct environ_entry *environ_next(struct environ_entry *);
  void	environ_copy(struct environ *, struct environ *);
  struct environ_entry *environ_find(struct environ *, const char *);
  void printflike(4, 5) environ_set(struct environ *, const char *, int,
  	    const char *, ...);
  void	environ_clear(struct environ *, const char *);
  void	environ_put(struct environ *, const char *, int);
  void	environ_unset(struct environ *, const char *);
  void	environ_update(struct options *, struct environ *, struct environ *);
  void	environ_push(struct environ *);
  void printflike(2, 3) environ_log(struct environ *, const char *, ...);
  struct environ *environ_for_session(struct session *, int);
  
  /* tty.c */
  void	tty_create_log(void);
  int	tty_window_bigger(struct tty *);
  int	tty_window_offset(struct tty *, u_int *, u_int *, u_int *, u_int *);
  void	tty_update_window_offset(struct window *);
  void	tty_update_client_offset(struct client *);
  void	tty_raw(struct tty *, const char *);
  void	tty_attributes(struct tty *, const struct grid_cell *,
  	    const struct grid_cell *, int *);
  void	tty_reset(struct tty *);
  void	tty_region_off(struct tty *);
  void	tty_margin_off(struct tty *);
  void	tty_cursor(struct tty *, u_int, u_int);
  void	tty_putcode(struct tty *, enum tty_code_code);
  void	tty_putcode1(struct tty *, enum tty_code_code, int);
  void	tty_putcode2(struct tty *, enum tty_code_code, int, int);
  void	tty_putcode3(struct tty *, enum tty_code_code, int, int, int);
  void	tty_putcode_ptr1(struct tty *, enum tty_code_code, const void *);
  void	tty_putcode_ptr2(struct tty *, enum tty_code_code, const void *,
  	    const void *);
  void	tty_puts(struct tty *, const char *);
  void	tty_putc(struct tty *, u_char);
  void	tty_putn(struct tty *, const void *, size_t, u_int);
  void	tty_cell(struct tty *, const struct grid_cell *,
  	    const struct grid_cell *, int *);
  int	tty_init(struct tty *, struct client *);
  void	tty_resize(struct tty *);
  void	tty_set_size(struct tty *, u_int, u_int, u_int, u_int);
  void	tty_start_tty(struct tty *);
  void	tty_send_requests(struct tty *);
  void	tty_stop_tty(struct tty *);
  void	tty_set_title(struct tty *, const char *);
  void	tty_update_mode(struct tty *, int, struct screen *);
  void	tty_draw_line(struct tty *, struct screen *, u_int, u_int, u_int,
  	    u_int, u_int, const struct grid_cell *, int *);
  void	tty_sync_start(struct tty *);
  void	tty_sync_end(struct tty *);
  int	tty_open(struct tty *, char **);
  void	tty_close(struct tty *);
  void	tty_free(struct tty *);
  void	tty_update_features(struct tty *);
  void	tty_set_selection(struct tty *, const char *, size_t);
  void	tty_write(void (*)(struct tty *, const struct tty_ctx *),
  	    struct tty_ctx *);
  void	tty_cmd_alignmenttest(struct tty *, const struct tty_ctx *);
  void	tty_cmd_cell(struct tty *, const struct tty_ctx *);
  void	tty_cmd_cells(struct tty *, const struct tty_ctx *);
  void	tty_cmd_clearendofline(struct tty *, const struct tty_ctx *);
  void	tty_cmd_clearendofscreen(struct tty *, const struct tty_ctx *);
  void	tty_cmd_clearline(struct tty *, const struct tty_ctx *);
  void	tty_cmd_clearscreen(struct tty *, const struct tty_ctx *);
  void	tty_cmd_clearstartofline(struct tty *, const struct tty_ctx *);
  void	tty_cmd_clearstartofscreen(struct tty *, const struct tty_ctx *);
  void	tty_cmd_deletecharacter(struct tty *, const struct tty_ctx *);
  void	tty_cmd_clearcharacter(struct tty *, const struct tty_ctx *);
  void	tty_cmd_deleteline(struct tty *, const struct tty_ctx *);
  void	tty_cmd_erasecharacter(struct tty *, const struct tty_ctx *);
  void	tty_cmd_insertcharacter(struct tty *, const struct tty_ctx *);
  void	tty_cmd_insertline(struct tty *, const struct tty_ctx *);
  void	tty_cmd_linefeed(struct tty *, const struct tty_ctx *);
  void	tty_cmd_scrollup(struct tty *, const struct tty_ctx *);
  void	tty_cmd_scrolldown(struct tty *, const struct tty_ctx *);
  void	tty_cmd_reverseindex(struct tty *, const struct tty_ctx *);
  void	tty_cmd_setselection(struct tty *, const struct tty_ctx *);
  void	tty_cmd_rawstring(struct tty *, const struct tty_ctx *);
  void	tty_cmd_syncstart(struct tty *, const struct tty_ctx *);
  void	tty_default_colours(struct grid_cell *, struct window_pane *);
  
  /* tty-term.c */
  extern struct tty_terms tty_terms;
  u_int		 tty_term_ncodes(void);
  void		 tty_term_apply(struct tty_term *, const char *, int);
  void		 tty_term_apply_overrides(struct tty_term *);
  struct tty_term *tty_term_create(struct tty *, char *, int *, int, char **);
  void		 tty_term_free(struct tty_term *);
  int		 tty_term_has(struct tty_term *, enum tty_code_code);
  const char	*tty_term_string(struct tty_term *, enum tty_code_code);
  const char	*tty_term_string1(struct tty_term *, enum tty_code_code, int);
  const char	*tty_term_string2(struct tty_term *, enum tty_code_code, int,
  		     int);
  const char	*tty_term_string3(struct tty_term *, enum tty_code_code, int,
  		     int, int);
  const char	*tty_term_ptr1(struct tty_term *, enum tty_code_code,
  		     const void *);
  const char	*tty_term_ptr2(struct tty_term *, enum tty_code_code,
  		     const void *, const void *);
  int		 tty_term_number(struct tty_term *, enum tty_code_code);
  int		 tty_term_flag(struct tty_term *, enum tty_code_code);
  const char	*tty_term_describe(struct tty_term *, enum tty_code_code);
  
  /* tty-features.c */
  void		 tty_add_features(int *, const char *, const char *);
  const char	*tty_get_features(int);
  int		 tty_apply_features(struct tty_term *, int);
  void		 tty_default_features(int *, const char *, u_int);
  
  /* tty-acs.c */
  int		 tty_acs_needed(struct tty *);
  const char	*tty_acs_get(struct tty *, u_char);
  int		 tty_acs_reverse_get(struct tty *, const char *, size_t);
  
  /* tty-keys.c */
  void		tty_keys_build(struct tty *);
  void		tty_keys_free(struct tty *);
  int		tty_keys_next(struct tty *);
  
  /* arguments.c */
  void		 args_set(struct args *, u_char, const char *);
  struct args	*args_parse(const char *, int, char **);
  void		 args_free(struct args *);
  char		*args_print(struct args *);
  char		*args_escape(const char *);
  int		 args_has(struct args *, u_char);
  const char	*args_get(struct args *, u_char);
  u_char		 args_first(struct args *, struct args_entry **);
  u_char		 args_next(struct args_entry **);
  const char	*args_first_value(struct args *, u_char, struct args_value **);
  const char	*args_next_value(struct args_value **);
  long long	 args_strtonum(struct args *, u_char, long long, long long,
  		     char **);
  long long	 args_percentage(struct args *, u_char, long long,
  		     long long, long long, char **);
  long long	 args_string_percentage(const char *, long long, long long,
  		     long long, char **);
  
  /* cmd-find.c */
  int		 cmd_find_target(struct cmd_find_state *, struct cmdq_item *,
  		     const char *, enum cmd_find_type, int);
  struct client	*cmd_find_best_client(struct session *);
  struct client	*cmd_find_client(struct cmdq_item *, const char *, int);
  void		 cmd_find_clear_state(struct cmd_find_state *, int);
  int		 cmd_find_empty_state(struct cmd_find_state *);
  int		 cmd_find_valid_state(struct cmd_find_state *);
  void		 cmd_find_copy_state(struct cmd_find_state *,
  		     struct cmd_find_state *);
  void		 cmd_find_from_session(struct cmd_find_state *,
  		     struct session *, int);
  void		 cmd_find_from_winlink(struct cmd_find_state *,
  		     struct winlink *, int);
  int		 cmd_find_from_session_window(struct cmd_find_state *,
  		     struct session *, struct window *, int);
  int		 cmd_find_from_window(struct cmd_find_state *, struct window *,
  		     int);
  void		 cmd_find_from_winlink_pane(struct cmd_find_state *,
  		     struct winlink *, struct window_pane *, int);
  int		 cmd_find_from_pane(struct cmd_find_state *,
  		     struct window_pane *, int);
  int		 cmd_find_from_client(struct cmd_find_state *, struct client *,
  		     int);
  int		 cmd_find_from_mouse(struct cmd_find_state *,
  		     struct mouse_event *, int);
  int		 cmd_find_from_nothing(struct cmd_find_state *, int);
  
  /* cmd.c */
  extern const struct cmd_entry *cmd_table[];
  void printflike(3, 4) cmd_log_argv(int, char **, const char *, ...);
  void		 cmd_prepend_argv(int *, char ***, char *);
  void		 cmd_append_argv(int *, char ***, char *);
  int		 cmd_pack_argv(int, char **, char *, size_t);
  int		 cmd_unpack_argv(char *, size_t, int, char ***);
  char	       **cmd_copy_argv(int, char **);
  void		 cmd_free_argv(int, char **);
  char		*cmd_stringify_argv(int, char **);
  char		*cmd_get_alias(const char *);
  const struct cmd_entry *cmd_get_entry(struct cmd *);
  struct args	*cmd_get_args(struct cmd *);
  u_int		 cmd_get_group(struct cmd *);
  void		 cmd_get_source(struct cmd *, const char **, u_int *);
  struct cmd	*cmd_parse(int, char **, const char *, u_int, char **);
  void		 cmd_free(struct cmd *);
  char		*cmd_print(struct cmd *);
  struct cmd_list	*cmd_list_new(void);
  void		 cmd_list_append(struct cmd_list *, struct cmd *);
  void		 cmd_list_move(struct cmd_list *, struct cmd_list *);
  void		 cmd_list_free(struct cmd_list *);
  char		*cmd_list_print(struct cmd_list *, int);
  struct cmd	*cmd_list_first(struct cmd_list *);
  struct cmd	*cmd_list_next(struct cmd *);
  int		 cmd_list_all_have(struct cmd_list *, int);
  int		 cmd_list_any_have(struct cmd_list *, int);
  int		 cmd_mouse_at(struct window_pane *, struct mouse_event *,
  		     u_int *, u_int *, int);
  struct winlink	*cmd_mouse_window(struct mouse_event *, struct session **);
  struct window_pane *cmd_mouse_pane(struct mouse_event *, struct session **,
  		     struct winlink **);
  char		*cmd_template_replace(const char *, const char *, int);
  
  /* cmd-attach-session.c */
  enum cmd_retval	 cmd_attach_session(struct cmdq_item *, const char *, int, int,
  		     int, const char *, int, const char *);
  
  /* cmd-parse.c */
  void		 cmd_parse_empty(struct cmd_parse_input *);
  struct cmd_parse_result *cmd_parse_from_file(FILE *, struct cmd_parse_input *);
  struct cmd_parse_result *cmd_parse_from_string(const char *,
  		     struct cmd_parse_input *);
  enum cmd_parse_status cmd_parse_and_insert(const char *,
  		     struct cmd_parse_input *, struct cmdq_item *,
  		     struct cmdq_state *, char **);
  enum cmd_parse_status cmd_parse_and_append(const char *,
  		     struct cmd_parse_input *, struct client *,
  		     struct cmdq_state *, char **);
  struct cmd_parse_result *cmd_parse_from_buffer(const void *, size_t,
  		     struct cmd_parse_input *);
  struct cmd_parse_result *cmd_parse_from_arguments(int, char **,
  		     struct cmd_parse_input *);
  
  /* cmd-queue.c */
  struct cmdq_state *cmdq_new_state(struct cmd_find_state *, struct key_event *,
  		     int);
  struct cmdq_state *cmdq_link_state(struct cmdq_state *);
  struct cmdq_state *cmdq_copy_state(struct cmdq_state *);
  void		  cmdq_free_state(struct cmdq_state *);
  void printflike(3, 4) cmdq_add_format(struct cmdq_state *, const char *,
  		     const char *, ...);
  void		  cmdq_merge_formats(struct cmdq_item *, struct format_tree *);
  struct cmdq_list *cmdq_new(void);
  void cmdq_free(struct cmdq_list *);
  const char	 *cmdq_get_name(struct cmdq_item *);
  struct client	 *cmdq_get_client(struct cmdq_item *);
  struct client	 *cmdq_get_target_client(struct cmdq_item *);
  struct cmdq_state *cmdq_get_state(struct cmdq_item *);
  struct cmd_find_state *cmdq_get_target(struct cmdq_item *);
  struct cmd_find_state *cmdq_get_source(struct cmdq_item *);
  struct key_event *cmdq_get_event(struct cmdq_item *);
  struct cmd_find_state *cmdq_get_current(struct cmdq_item *);
  int		  cmdq_get_flags(struct cmdq_item *);
  struct cmdq_item *cmdq_get_command(struct cmd_list *, struct cmdq_state *);
  #define cmdq_get_callback(cb, data) cmdq_get_callback1(#cb, cb, data)
  struct cmdq_item *cmdq_get_callback1(const char *, cmdq_cb, void *);
  struct cmdq_item *cmdq_get_error(const char *);
  struct cmdq_item *cmdq_insert_after(struct cmdq_item *, struct cmdq_item *);
  struct cmdq_item *cmdq_append(struct client *, struct cmdq_item *);
  void		 cmdq_insert_hook(struct session *, struct cmdq_item *,
  		     struct cmd_find_state *, const char *, ...);
  void		 cmdq_continue(struct cmdq_item *);
  u_int		 cmdq_next(struct client *);
  struct cmdq_item *cmdq_running(struct client *);
  void		 cmdq_guard(struct cmdq_item *, const char *, int);
  void printflike(2, 3) cmdq_print(struct cmdq_item *, const char *, ...);
  void printflike(2, 3) cmdq_error(struct cmdq_item *, const char *, ...);
  
  /* cmd-wait-for.c */
  void	cmd_wait_for_flush(void);
  
  /* client.c */
  int	client_main(struct event_base *, int, char **, uint64_t, int);
  
  /* key-bindings.c */
  struct key_table *key_bindings_get_table(const char *, int);
  struct key_table *key_bindings_first_table(void);
  struct key_table *key_bindings_next_table(struct key_table *);
  void	 key_bindings_unref_table(struct key_table *);
  struct key_binding *key_bindings_get(struct key_table *, key_code);
  struct key_binding *key_bindings_get_default(struct key_table *, key_code);
  struct key_binding *key_bindings_first(struct key_table *);
  struct key_binding *key_bindings_next(struct key_table *, struct key_binding *);
  void	 key_bindings_add(const char *, key_code, const char *, int,
  	     struct cmd_list *);
  void	 key_bindings_remove(const char *, key_code);
  void	 key_bindings_reset(const char *, key_code);
  void	 key_bindings_remove_table(const char *);
  void	 key_bindings_reset_table(const char *);
  void	 key_bindings_init(void);
  struct cmdq_item *key_bindings_dispatch(struct key_binding *,
  	     struct cmdq_item *, struct client *, struct key_event *,
  	     struct cmd_find_state *);
  
  /* key-string.c */
  key_code	 key_string_lookup_string(const char *);
  const char	*key_string_lookup_key(key_code, int);
  
  /* alerts.c */
  void	alerts_reset_all(void);
  void	alerts_queue(struct window *, int);
  void	alerts_check_session(struct session *);
  
  /* file.c */
  int	 file_cmp(struct client_file *, struct client_file *);
  RB_PROTOTYPE(client_files, client_file, entry, file_cmp);
  struct client_file *file_create(struct client *, int, client_file_cb, void *);
  void	 file_free(struct client_file *);
  void	 file_fire_done(struct client_file *);
  void	 file_fire_read(struct client_file *);
  int	 file_can_print(struct client *);
  void printflike(2, 3) file_print(struct client *, const char *, ...);
  void	 file_vprint(struct client *, const char *, va_list);
  void	 file_print_buffer(struct client *, void *, size_t);
  void printflike(2, 3) file_error(struct client *, const char *, ...);
  void	 file_write(struct client *, const char *, int, const void *, size_t,
  	     client_file_cb, void *);
  void	 file_read(struct client *, const char *, client_file_cb, void *);
  void	 file_push(struct client_file *);
  
  /* server.c */
  extern struct tmuxproc *server_proc;
  extern struct clients clients;
  extern struct cmd_find_state marked_pane;
  extern struct message_list message_log;
  void	 server_set_marked(struct session *, struct winlink *,
  	     struct window_pane *);
  void	 server_clear_marked(void);
  int	 server_is_marked(struct session *, struct winlink *,
  	     struct window_pane *);
  int	 server_check_marked(void);
  int	 server_start(struct tmuxproc *, int, struct event_base *, int, char *);
  void	 server_update_socket(void);
  void	 server_add_accept(int);
  void printflike(1, 2) server_add_message(const char *, ...);
  
  /* server-client.c */
  RB_PROTOTYPE(client_windows, client_window, entry, server_client_window_cmp);
  u_int	 server_client_how_many(void);
  void	 server_client_set_overlay(struct client *, u_int, overlay_check_cb,
  	     overlay_mode_cb, overlay_draw_cb, overlay_key_cb,
  	     overlay_free_cb, void *);
  void	 server_client_clear_overlay(struct client *);
  void	 server_client_set_key_table(struct client *, const char *);
  const char *server_client_get_key_table(struct client *);
  int	 server_client_check_nested(struct client *);
  int	 server_client_handle_key(struct client *, struct key_event *);
  struct client *server_client_create(int);
  int	 server_client_open(struct client *, char **);
  void	 server_client_unref(struct client *);
  void	 server_client_lost(struct client *);
  void	 server_client_suspend(struct client *);
  void	 server_client_detach(struct client *, enum msgtype);
  void	 server_client_exec(struct client *, const char *);
  void	 server_client_loop(void);
  void	 server_client_push_stdout(struct client *);
  void	 server_client_push_stderr(struct client *);
  const char *server_client_get_cwd(struct client *, struct session *);
  void	 server_client_set_flags(struct client *, const char *);
  const char *server_client_get_flags(struct client *);
  struct window_pane *server_client_get_pane(struct client *);
  void	 server_client_set_pane(struct client *, struct window_pane *);
  void	 server_client_remove_pane(struct window_pane *);
  
  /* server-fn.c */
  void	 server_redraw_client(struct client *);
  void	 server_status_client(struct client *);
  void	 server_redraw_session(struct session *);
  void	 server_redraw_session_group(struct session *);
  void	 server_status_session(struct session *);
  void	 server_status_session_group(struct session *);
  void	 server_redraw_window(struct window *);
  void	 server_redraw_window_borders(struct window *);
  void	 server_status_window(struct window *);
  void	 server_lock(void);
  void	 server_lock_session(struct session *);
  void	 server_lock_client(struct client *);
  void	 server_kill_pane(struct window_pane *);
  void	 server_kill_window(struct window *, int);
  void	 server_renumber_session(struct session *);
  void	 server_renumber_all(void);
  int	 server_link_window(struct session *,
  	     struct winlink *, struct session *, int, int, int, char **);
  void	 server_unlink_window(struct session *, struct winlink *);
  void	 server_destroy_pane(struct window_pane *, int);
  void	 server_destroy_session(struct session *);
  void	 server_check_unattached(void);
  void	 server_unzoom_window(struct window *);
  
  /* status.c */
  void	 status_timer_start(struct client *);
  void	 status_timer_start_all(void);
  void	 status_update_cache(struct session *);
  int	 status_at_line(struct client *);
  u_int	 status_line_size(struct client *);
  struct style_range *status_get_range(struct client *, u_int, u_int);
  void	 status_init(struct client *);
  void	 status_free(struct client *);
  int	 status_redraw(struct client *);
  void status_message_set(struct client *, int, int, const char *, ...);
  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,
  	     void *, int);
  void	 status_prompt_clear(struct client *);
  int	 status_prompt_redraw(struct client *);
  int	 status_prompt_key(struct client *, key_code);
  void	 status_prompt_update(struct client *, const char *, const char *);
  void	 status_prompt_load_history(void);
  void	 status_prompt_save_history(void);
  
  /* resize.c */
  void	 resize_window(struct window *, u_int, u_int, int, int);
  void	 default_window_size(struct client *, struct session *, struct window *,
  	     u_int *, u_int *, u_int *, u_int *, int);
  void	 recalculate_size(struct window *, int);
  void	 recalculate_sizes(void);
  void	 recalculate_sizes_now(int);
  
  /* input.c */
  struct input_ctx *input_init(struct window_pane *, struct bufferevent *);
  void	 input_free(struct input_ctx *);
  void	 input_reset(struct input_ctx *, int);
  struct evbuffer *input_pending(struct input_ctx *);
  void	 input_parse_pane(struct window_pane *);
  void	 input_parse_buffer(struct window_pane *, u_char *, size_t);
  void	 input_parse_screen(struct input_ctx *, struct screen *,
  	     screen_write_init_ctx_cb, void *, u_char *, size_t);
  
  /* input-key.c */
  void	 input_key_build(void);
  int	 input_key_pane(struct window_pane *, key_code, struct mouse_event *);
  int	 input_key(struct screen *, struct bufferevent *, key_code);
  int	 input_key_get_mouse(struct screen *, struct mouse_event *, u_int,
  	     u_int, const char **, size_t *);
  
  /* colour.c */
  int	 colour_find_rgb(u_char, u_char, u_char);
  int	 colour_join_rgb(u_char, u_char, u_char);
  void	 colour_split_rgb(int, u_char *, u_char *, u_char *);
  const char *colour_tostring(int);
  int	 colour_fromstring(const char *s);
  int	 colour_256toRGB(int);
  int	 colour_256to16(int);
  
  /* attributes.c */
  const char *attributes_tostring(int);
  int	 attributes_fromstring(const char *);
  
  /* grid.c */
  extern const struct grid_cell grid_default_cell;
  void	 grid_empty_line(struct grid *, u_int, u_int);
  int	 grid_cells_equal(const struct grid_cell *, const struct grid_cell *);
  int	 grid_cells_look_equal(const struct grid_cell *,
  	     const struct grid_cell *);
  struct grid *grid_create(u_int, u_int, u_int);
  void	 grid_destroy(struct grid *);
  int	 grid_compare(struct grid *, struct grid *);
  void	 grid_collect_history(struct grid *);
  void	 grid_remove_history(struct grid *, u_int );
  void	 grid_scroll_history(struct grid *, u_int);
  void	 grid_scroll_history_region(struct grid *, u_int, u_int, u_int);
  void	 grid_clear_history(struct grid *);
  const struct grid_line *grid_peek_line(struct grid *, u_int);
  void	 grid_get_cell(struct grid *, u_int, u_int, struct grid_cell *);
  void	 grid_set_cell(struct grid *, u_int, u_int, const struct grid_cell *);
  void	 grid_set_padding(struct grid *, u_int, u_int);
  void	 grid_set_cells(struct grid *, u_int, u_int, const struct grid_cell *,
  	     const char *, size_t);
  struct grid_line *grid_get_line(struct grid *, u_int);
  void	 grid_adjust_lines(struct grid *, u_int);
  void	 grid_clear(struct grid *, u_int, u_int, u_int, u_int, u_int);
  void	 grid_clear_lines(struct grid *, u_int, u_int, u_int);
  void	 grid_move_lines(struct grid *, u_int, u_int, u_int, u_int);
  void	 grid_move_cells(struct grid *, u_int, u_int, u_int, u_int, u_int);
  char	*grid_string_cells(struct grid *, u_int, u_int, u_int,
  	     struct grid_cell **, int, int, int);
  void	 grid_duplicate_lines(struct grid *, u_int, struct grid *, u_int,
  	     u_int);
  void	 grid_reflow(struct grid *, u_int);
  void	 grid_wrap_position(struct grid *, u_int, u_int, u_int *, u_int *);
  void	 grid_unwrap_position(struct grid *, u_int *, u_int *, u_int, u_int);
  u_int	 grid_line_length(struct grid *, u_int);
  
  /* grid-view.c */
  void	 grid_view_get_cell(struct grid *, u_int, u_int, struct grid_cell *);
  void	 grid_view_set_cell(struct grid *, u_int, u_int,
  	     const struct grid_cell *);
  void	 grid_view_set_padding(struct grid *, u_int, u_int);
  void	 grid_view_set_cells(struct grid *, u_int, u_int,
  	     const struct grid_cell *, const char *, size_t);
  void	 grid_view_clear_history(struct grid *, u_int);
  void	 grid_view_clear(struct grid *, u_int, u_int, u_int, u_int, u_int);
  void	 grid_view_scroll_region_up(struct grid *, u_int, u_int, u_int);
  void	 grid_view_scroll_region_down(struct grid *, u_int, u_int, u_int);
  void	 grid_view_insert_lines(struct grid *, u_int, u_int, u_int);
  void	 grid_view_insert_lines_region(struct grid *, u_int, u_int, u_int,
  	     u_int);
  void	 grid_view_delete_lines(struct grid *, u_int, u_int, u_int);
  void	 grid_view_delete_lines_region(struct grid *, u_int, u_int, u_int,
  	     u_int);
  void	 grid_view_insert_cells(struct grid *, u_int, u_int, u_int, u_int);
  void	 grid_view_delete_cells(struct grid *, u_int, u_int, u_int, u_int);
  char	*grid_view_string_cells(struct grid *, u_int, u_int, u_int);
  
  /* screen-write.c */
  void	 screen_write_make_list(struct screen *);
  void	 screen_write_free_list(struct screen *);
  void	 screen_write_start_pane(struct screen_write_ctx *,
  	     struct window_pane *, struct screen *);
  void	 screen_write_start(struct screen_write_ctx *, struct screen *);
  void	 screen_write_start_callback(struct screen_write_ctx *, struct screen *,
  	     screen_write_init_ctx_cb, void *);
  void	 screen_write_stop(struct screen_write_ctx *);
  void	 screen_write_reset(struct screen_write_ctx *);
  size_t printflike(1, 2) screen_write_strlen(const char *, ...);
  int printflike(7, 8) screen_write_text(struct screen_write_ctx *, u_int, u_int,
  	     u_int, int, const struct grid_cell *, const char *, ...);
  void printflike(3, 4) screen_write_puts(struct screen_write_ctx *,
  	     const struct grid_cell *, const char *, ...);
  void printflike(4, 5) screen_write_nputs(struct screen_write_ctx *,
  	     ssize_t, const struct grid_cell *, const char *, ...);
  void	 screen_write_vnputs(struct screen_write_ctx *, ssize_t,
  	     const struct grid_cell *, const char *, va_list);
  void	 screen_write_putc(struct screen_write_ctx *, const struct grid_cell *,
  	     u_char);
  void	 screen_write_fast_copy(struct screen_write_ctx *, struct screen *,
  	     u_int, u_int, u_int, u_int);
  void	 screen_write_hline(struct screen_write_ctx *, u_int, int, int);
  void	 screen_write_vline(struct screen_write_ctx *, u_int, int, int);
  void	 screen_write_menu(struct screen_write_ctx *, struct menu *, int,
  	     const struct grid_cell *);
  void	 screen_write_box(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_preview(struct screen_write_ctx *, struct screen *, u_int,
  	     u_int);
  void	 screen_write_backspace(struct screen_write_ctx *);
  void	 screen_write_mode_set(struct screen_write_ctx *, int);
  void	 screen_write_mode_clear(struct screen_write_ctx *, int);
  void	 screen_write_cursorup(struct screen_write_ctx *, u_int);
  void	 screen_write_cursordown(struct screen_write_ctx *, u_int);
  void	 screen_write_cursorright(struct screen_write_ctx *, u_int);
  void	 screen_write_cursorleft(struct screen_write_ctx *, u_int);
  void	 screen_write_alignmenttest(struct screen_write_ctx *);
  void	 screen_write_insertcharacter(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_deletecharacter(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_clearcharacter(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_insertline(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_deleteline(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_clearline(struct screen_write_ctx *, u_int);
  void	 screen_write_clearendofline(struct screen_write_ctx *, u_int);
  void	 screen_write_clearstartofline(struct screen_write_ctx *, u_int);
  void	 screen_write_cursormove(struct screen_write_ctx *, int, int, int);
  void	 screen_write_reverseindex(struct screen_write_ctx *, u_int);
  void	 screen_write_scrollregion(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_linefeed(struct screen_write_ctx *, int, u_int);
  void	 screen_write_scrollup(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_scrolldown(struct screen_write_ctx *, u_int, u_int);
  void	 screen_write_carriagereturn(struct screen_write_ctx *);
  void	 screen_write_clearendofscreen(struct screen_write_ctx *, u_int);
  void	 screen_write_clearstartofscreen(struct screen_write_ctx *, u_int);
  void	 screen_write_clearscreen(struct screen_write_ctx *, u_int);
  void	 screen_write_clearhistory(struct screen_write_ctx *);
  void	 screen_write_collect_end(struct screen_write_ctx *);
  void	 screen_write_collect_add(struct screen_write_ctx *,
  	     const struct grid_cell *);
  void	 screen_write_cell(struct screen_write_ctx *, const struct grid_cell *);
  void	 screen_write_setselection(struct screen_write_ctx *, u_char *, u_int);
  void	 screen_write_rawstring(struct screen_write_ctx *, u_char *, u_int);
  void	 screen_write_alternateon(struct screen_write_ctx *,
  	     struct grid_cell *, int);
  void	 screen_write_alternateoff(struct screen_write_ctx *,
  	     struct grid_cell *, int);
  
  /* screen-redraw.c */
  void	 screen_redraw_screen(struct client *);
  void	 screen_redraw_pane(struct client *, struct window_pane *);
  
  /* screen.c */
  void	 screen_init(struct screen *, u_int, u_int, u_int);
  void	 screen_reinit(struct screen *);
  void	 screen_free(struct screen *);
  void	 screen_reset_tabs(struct screen *);
  void	 screen_set_cursor_style(struct screen *, u_int);
  void	 screen_set_cursor_colour(struct screen *, const char *);
  int	 screen_set_title(struct screen *, const char *);
  void	 screen_set_path(struct screen *, const char *);
  void	 screen_push_title(struct screen *);
  void	 screen_pop_title(struct screen *);
  void	 screen_resize(struct screen *, u_int, u_int, int);
  void	 screen_resize_cursor(struct screen *, u_int, u_int, int, int, int);
  void	 screen_set_selection(struct screen *, u_int, u_int, u_int, u_int,
  	     u_int, int, struct grid_cell *);
  void	 screen_clear_selection(struct screen *);
  void	 screen_hide_selection(struct screen *);
  int	 screen_check_selection(struct screen *, u_int, u_int);
  void	 screen_select_cell(struct screen *, struct grid_cell *,
  	     const struct grid_cell *);
  void	 screen_alternate_on(struct screen *, struct grid_cell *, int);
  void	 screen_alternate_off(struct screen *, struct grid_cell *, int);
  
  /* window.c */
  extern struct windows windows;
  extern struct window_pane_tree all_window_panes;
  extern const struct window_mode *all_window_modes[];
  int		 window_cmp(struct window *, struct window *);
  RB_PROTOTYPE(windows, window, entry, window_cmp);
  int		 winlink_cmp(struct winlink *, struct winlink *);
  RB_PROTOTYPE(winlinks, winlink, entry, winlink_cmp);
  int		 window_pane_cmp(struct window_pane *, struct window_pane *);
  RB_PROTOTYPE(window_pane_tree, window_pane, tree_entry, window_pane_cmp);
  struct winlink	*winlink_find_by_index(struct winlinks *, int);
  struct winlink	*winlink_find_by_window(struct winlinks *, struct window *);
  struct winlink	*winlink_find_by_window_id(struct winlinks *, u_int);
  u_int		 winlink_count(struct winlinks *);
  struct winlink	*winlink_add(struct winlinks *, int);
  void		 winlink_set_window(struct winlink *, struct window *);
  void		 winlink_remove(struct winlinks *, struct winlink *);
  struct winlink	*winlink_next(struct winlink *);
  struct winlink	*winlink_previous(struct winlink *);
  struct winlink	*winlink_next_by_number(struct winlink *, struct session *,
  		     int);
  struct winlink	*winlink_previous_by_number(struct winlink *, struct session *,
  		     int);
  void		 winlink_stack_push(struct winlink_stack *, struct winlink *);
  void		 winlink_stack_remove(struct winlink_stack *, struct winlink *);
  struct window	*window_find_by_id_str(const char *);
  struct window	*window_find_by_id(u_int);
  void		 window_update_activity(struct window *);
  struct window	*window_create(u_int, u_int, u_int, u_int);
  void		 window_pane_set_event(struct window_pane *);
  struct window_pane *window_get_active_at(struct window *, u_int, u_int);
  struct window_pane *window_find_string(struct window *, const char *);
  int		 window_has_pane(struct window *, struct window_pane *);
  int		 window_set_active_pane(struct window *, struct window_pane *,
  		     int);
  void		 window_redraw_active_switch(struct window *,
  		     struct window_pane *);
  struct window_pane *window_add_pane(struct window *, struct window_pane *,
  		     u_int, int);
  void		 window_resize(struct window *, u_int, u_int, int, int);
  void		 window_pane_send_resize(struct window_pane *, int);
  int		 window_zoom(struct window_pane *);
  int		 window_unzoom(struct window *);
  int		 window_push_zoom(struct window *, int);
  int		 window_pop_zoom(struct window *);
  void		 window_lost_pane(struct window *, struct window_pane *);
  void		 window_remove_pane(struct window *, struct window_pane *);
  struct window_pane *window_pane_at_index(struct window *, u_int);
  struct window_pane *window_pane_next_by_number(struct window *,
  			struct window_pane *, u_int);
  struct window_pane *window_pane_previous_by_number(struct window *,
  			struct window_pane *, u_int);
  int		 window_pane_index(struct window_pane *, u_int *);
  u_int		 window_count_panes(struct window *);
  void		 window_destroy_panes(struct window *);
  struct window_pane *window_pane_find_by_id_str(const char *);
  struct window_pane *window_pane_find_by_id(u_int);
  int		 window_pane_destroy_ready(struct window_pane *);
  void		 window_pane_resize(struct window_pane *, u_int, u_int);
  void		 window_pane_set_palette(struct window_pane *, u_int, int);
  void		 window_pane_unset_palette(struct window_pane *, u_int);
  void		 window_pane_reset_palette(struct window_pane *);
  int		 window_pane_get_palette(struct window_pane *, int);
  int		 window_pane_set_mode(struct window_pane *,
  		     struct window_pane *, const struct window_mode *,
  		     struct cmd_find_state *, struct args *);
  void		 window_pane_reset_mode(struct window_pane *);
  void		 window_pane_reset_mode_all(struct window_pane *);
  int		 window_pane_key(struct window_pane *, struct client *,
  		     struct session *, struct winlink *, key_code,
  		     struct mouse_event *);
  int		 window_pane_visible(struct window_pane *);
  u_int		 window_pane_search(struct window_pane *, const char *, int,
  		     int);
  const char	*window_printable_flags(struct winlink *);
  struct window_pane *window_pane_find_up(struct window_pane *);
  struct window_pane *window_pane_find_down(struct window_pane *);
  struct window_pane *window_pane_find_left(struct window_pane *);
  struct window_pane *window_pane_find_right(struct window_pane *);
  void		 window_set_name(struct window *, const char *);
  void		 window_add_ref(struct window *, const char *);
  void		 window_remove_ref(struct window *, const char *);
  void		 winlink_clear_flags(struct winlink *);
  int		 winlink_shuffle_up(struct session *, struct winlink *, int);
  int		 window_pane_start_input(struct window_pane *,
  		     struct cmdq_item *, char **);
  void		*window_pane_get_new_data(struct window_pane *,
  		     struct window_pane_offset *, size_t *);
  void		 window_pane_update_used_data(struct window_pane *,
  		     struct window_pane_offset *, size_t);
  
  /* layout.c */
  u_int		 layout_count_cells(struct layout_cell *);
  struct layout_cell *layout_create_cell(struct layout_cell *);
  void		 layout_free_cell(struct layout_cell *);
  void		 layout_print_cell(struct layout_cell *, const char *, u_int);
  void		 layout_destroy_cell(struct window *, struct layout_cell *,
  		     struct layout_cell **);
  void		 layout_resize_layout(struct window *, struct layout_cell *,
  		     enum layout_type, int, int);
  struct layout_cell *layout_search_by_border(struct layout_cell *, u_int, u_int);
  void		 layout_set_size(struct layout_cell *, u_int, u_int, u_int,
  		     u_int);
  void		 layout_make_leaf(struct layout_cell *, struct window_pane *);
  void		 layout_make_node(struct layout_cell *, enum layout_type);
  void		 layout_fix_offsets(struct window *);
  void		 layout_fix_panes(struct window *);
  void		 layout_resize_adjust(struct window *, struct layout_cell *,
  		     enum layout_type, int);
  void		 layout_init(struct window *, struct window_pane *);
  void		 layout_free(struct window *);
  void		 layout_resize(struct window *, u_int, u_int);
  void		 layout_resize_pane(struct window_pane *, enum layout_type,
  		     int, int);
  void		 layout_resize_pane_to(struct window_pane *, enum layout_type,
  		     u_int);
  void		 layout_assign_pane(struct layout_cell *, struct window_pane *);
  struct layout_cell *layout_split_pane(struct window_pane *, enum layout_type,
  		     int, int);
  void		 layout_close_pane(struct window_pane *);
  int		 layout_spread_cell(struct window *, struct layout_cell *);
  void		 layout_spread_out(struct window_pane *);
  
  /* layout-custom.c */
  char		*layout_dump(struct layout_cell *);
  int		 layout_parse(struct window *, const char *);
  
  /* layout-set.c */
  int		 layout_set_lookup(const char *);
  u_int		 layout_set_select(struct window *, u_int);
  u_int		 layout_set_next(struct window *);
  u_int		 layout_set_previous(struct window *);
  
  /* mode-tree.c */
  typedef void (*mode_tree_build_cb)(void *, struct mode_tree_sort_criteria *,
  				   uint64_t *, const char *);
  typedef void (*mode_tree_draw_cb)(void *, void *, struct screen_write_ctx *,
  	     u_int, u_int);
  typedef int (*mode_tree_search_cb)(void *, void *, const char *);
  typedef void (*mode_tree_menu_cb)(void *, struct client *, key_code);
  typedef u_int (*mode_tree_height_cb)(void *, u_int);
  typedef void (*mode_tree_each_cb)(void *, void *, struct client *, key_code);
  u_int	 mode_tree_count_tagged(struct mode_tree_data *);
  void	*mode_tree_get_current(struct mode_tree_data *);
  const char *mode_tree_get_current_name(struct mode_tree_data *);
  void	 mode_tree_expand_current(struct mode_tree_data *);
  void	 mode_tree_collapse_current(struct mode_tree_data *);
  void	 mode_tree_expand(struct mode_tree_data *, uint64_t);
  int	 mode_tree_set_current(struct mode_tree_data *, uint64_t);
  void	 mode_tree_each_tagged(struct mode_tree_data *, mode_tree_each_cb,
  	     struct client *, key_code, int);
  void	 mode_tree_up(struct mode_tree_data *, int);
  void	 mode_tree_down(struct mode_tree_data *, int);
  struct mode_tree_data *mode_tree_start(struct window_pane *, struct args *,
  	     mode_tree_build_cb, mode_tree_draw_cb, mode_tree_search_cb,
  	     mode_tree_menu_cb, mode_tree_height_cb, void *,
  	     const struct menu_item *, const char **, u_int, struct screen **);
  void	 mode_tree_zoom(struct mode_tree_data *, struct args *);
  void	 mode_tree_build(struct mode_tree_data *);
  void	 mode_tree_free(struct mode_tree_data *);
  void	 mode_tree_resize(struct mode_tree_data *, u_int, u_int);
  struct mode_tree_item *mode_tree_add(struct mode_tree_data *,
  	     struct mode_tree_item *, void *, uint64_t, const char *,
  	     const char *, int);
  void	 mode_tree_draw_as_parent(struct mode_tree_item *);
  void	 mode_tree_no_tag(struct mode_tree_item *);
  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_run_command(struct client *, struct cmd_find_state *,
  	     const char *, const char *);
  
  /* window-buffer.c */
  extern const struct window_mode window_buffer_mode;
  
  /* window-tree.c */
  extern const struct window_mode window_tree_mode;
  
  /* window-clock.c */
  extern const struct window_mode window_clock_mode;
  extern const char window_clock_table[14][5][5];
  
  /* window-client.c */
  extern const struct window_mode window_client_mode;
  
  /* window-copy.c */
  extern const struct window_mode window_copy_mode;
  extern const struct window_mode window_view_mode;
  void printflike(2, 3) window_copy_add(struct window_pane *, const char *, ...);
  void		 window_copy_vadd(struct window_pane *, const char *, va_list);
  void		 window_copy_pageup(struct window_pane *, int);
  void		 window_copy_start_drag(struct client *, struct mouse_event *);
  char		*window_copy_get_word(struct window_pane *, u_int, u_int);
  char		*window_copy_get_line(struct window_pane *, u_int);
  
  /* window-option.c */
  extern const struct window_mode window_customize_mode;
  
  /* names.c */
  void	 check_window_name(struct window *);
  char	*default_window_name(struct window *);
  char	*parse_window_name(const char *);
  
  /* control.c */
  void	control_discard(struct client *);
  void	control_start(struct client *);
  void	control_stop(struct client *);
  void	control_set_pane_on(struct client *, struct window_pane *);
  void	control_set_pane_off(struct client *, struct window_pane *);
  void	control_continue_pane(struct client *, struct window_pane *);
  void	control_pause_pane(struct client *, struct window_pane *);
  struct window_pane_offset *control_pane_offset(struct client *,
  	   struct window_pane *, int *);
  void	control_reset_offsets(struct client *);
  void printflike(2, 3) control_write(struct client *, const char *, ...);
  void	control_write_output(struct client *, struct window_pane *);
  int	control_all_done(struct client *);
  void	control_add_sub(struct client *, const char *, enum control_sub_type,
      	   int, const char *);
  void	control_remove_sub(struct client *, const char *);
  
  /* control-notify.c */
  void	control_notify_input(struct client *, struct window_pane *,
  	    const u_char *, size_t);
  void	control_notify_pane_mode_changed(int);
  void	control_notify_window_layout_changed(struct window *);
  void	control_notify_window_pane_changed(struct window *);
  void	control_notify_window_unlinked(struct session *, struct window *);
  void	control_notify_window_linked(struct session *, struct window *);
  void	control_notify_window_renamed(struct window *);
  void	control_notify_client_session_changed(struct client *);
  void	control_notify_session_renamed(struct session *);
  void	control_notify_session_created(struct session *);
  void	control_notify_session_closed(struct session *);
  void	control_notify_session_window_changed(struct session *);
  
  /* session.c */
  extern struct sessions sessions;
  int	session_cmp(struct session *, struct session *);
  RB_PROTOTYPE(sessions, session, entry, session_cmp);
  int		 session_alive(struct session *);
  struct session	*session_find(const char *);
  struct session	*session_find_by_id_str(const char *);
  struct session	*session_find_by_id(u_int);
  struct session	*session_create(const char *, const char *, const char *,
  		     struct environ *, struct options *, struct termios *);
  void		 session_destroy(struct session *, int,	 const char *);
  void		 session_add_ref(struct session *, const char *);
  void		 session_remove_ref(struct session *, const char *);
  char		*session_check_name(const char *);
  void		 session_update_activity(struct session *, struct timeval *);
  struct session	*session_next_session(struct session *);
  struct session	*session_previous_session(struct session *);
  struct winlink	*session_new(struct session *, const char *, int, char **,
  		     const char *, const char *, int, char **);
  struct winlink	*session_attach(struct session *, struct window *, int,
  		     char **);
  int		 session_detach(struct session *, struct winlink *);
  int		 session_has(struct session *, struct window *);
  int		 session_is_linked(struct session *, struct window *);
  int		 session_next(struct session *, int);
  int		 session_previous(struct session *, int);
  int		 session_select(struct session *, int);
  int		 session_last(struct session *);
  int		 session_set_current(struct session *, struct winlink *);
  struct session_group *session_group_contains(struct session *);
  struct session_group *session_group_find(const char *);
  struct session_group *session_group_new(const char *);
  void		 session_group_add(struct session_group *, struct session *);
  void		 session_group_synchronize_to(struct session *);
  void		 session_group_synchronize_from(struct session *);
  u_int		 session_group_count(struct session_group *);
  u_int		 session_group_attached_count(struct session_group *);
  void		 session_renumber_windows(struct session *);
  
  /* utf8.c */
  utf8_char	 utf8_build_one(u_char);
  enum utf8_state	 utf8_from_data(const struct utf8_data *, utf8_char *);
  void		 utf8_to_data(utf8_char, struct utf8_data *);
  void		 utf8_set(struct utf8_data *, u_char);
  void		 utf8_copy(struct utf8_data *, const struct utf8_data *);
  enum utf8_state	 utf8_open(struct utf8_data *, u_char);
  enum utf8_state	 utf8_append(struct utf8_data *, u_char);
  int		 utf8_isvalid(const char *);
  int		 utf8_strvis(char *, const char *, size_t, int);
  int		 utf8_stravis(char **, const char *, int);
  int		 utf8_stravisx(char **, const char *, size_t, int);
  char		*utf8_sanitize(const char *);
  size_t		 utf8_strlen(const struct utf8_data *);
  u_int		 utf8_strwidth(const struct utf8_data *, ssize_t);
  struct utf8_data *utf8_fromcstr(const char *);
  char		*utf8_tocstr(struct utf8_data *);
  u_int		 utf8_cstrwidth(const char *);
  char		*utf8_padcstr(const char *, u_int);
  char		*utf8_rpadcstr(const char *, u_int);
  int		 utf8_cstrhas(const char *, const struct utf8_data *);
  
  /* osdep-*.c */
  char		*osdep_get_name(int, char *);
  char		*osdep_get_cwd(int);
  struct event_base *osdep_event_init(void);
  
  /* log.c */
  void	log_add_level(void);
  int	log_get_level(void);
  void	log_open(const char *);
  void	log_toggle(const char *);
  void	log_close(void);
  void printflike(1, 2) log_debug(const char *, ...);
  __dead void printflike(1, 2) fatal(const char *, ...);
  __dead void printflike(1, 2) fatalx(const char *, ...);
  
  /* menu.c */
  #define MENU_NOMOUSE 0x1
  #define MENU_TAB 0x2
  #define MENU_STAYOPEN 0x4
  struct menu	*menu_create(const char *);
  void		 menu_add_items(struct menu *, const struct menu_item *,
  		    struct cmdq_item *, struct client *,
  		    struct cmd_find_state *);
  void		 menu_add_item(struct menu *, const struct menu_item *,
  		    struct cmdq_item *, struct client *,
  		    struct cmd_find_state *);
  void		 menu_free(struct menu *);
  int		 menu_display(struct menu *, int, struct cmdq_item *, u_int,
  		    u_int, struct client *, struct cmd_find_state *,
  		    menu_choice_cb, void *);
  
  /* popup.c */
  #define POPUP_WRITEKEYS 0x1
  #define POPUP_CLOSEEXIT 0x2
  #define POPUP_CLOSEEXITZERO 0x4
  typedef void (*popup_close_cb)(int, void *);
  typedef void (*popup_finish_edit_cb)(char *, size_t, void *);
  u_int		 popup_width(struct cmdq_item *, u_int, const char **,
  		    struct client *, struct cmd_find_state *);
  u_int		 popup_height(u_int, const char **);
  int		 popup_display(int, struct cmdq_item *, u_int, u_int, u_int,
  		    u_int, u_int, const char **, const char *, const char *,
  		    const char *, struct client *, struct cmd_find_state *,
  		    popup_close_cb, void *);
  int		 popup_editor(struct client *, const char *, size_t,
  		    popup_finish_edit_cb, void *);
  
  /* style.c */
  int		 style_parse(struct style *,const struct grid_cell *,
  		     const char *);
  const char	*style_tostring(struct style *);
  void		 style_add(struct grid_cell *, struct options *,
  		     const char *, struct format_tree *);
  void		 style_apply(struct grid_cell *, struct options *,
  		     const char *, struct format_tree *);
  void		 style_set(struct style *, const struct grid_cell *);
  void		 style_copy(struct style *, struct style *);
  
  /* spawn.c */
  struct winlink	*spawn_window(struct spawn_context *, char **);
  struct window_pane *spawn_pane(struct spawn_context *, char **);
  
  /* regsub.c */
  char		*regsub(const char *, const char *, const char *, int);
  
  #endif /* TMUX_H */
  