date and time created 83/02/11 15:44:54 by rrh

[unix-history] / usr / src / usr.bin / ex / ex_vis.h

/* Copyright (c) 1981 Regents of the University of California */
/* sccs id:	@(#)ex_vis.h	7.1	7/8/81  */
/*
 * Ex version 3
 * Mark Horton, UCB
 * Bill Joy UCB
 *
 * Open and visual mode definitions.
 * 
 * There are actually 4 major states in open/visual modes.  These
 * are visual, crt open (where the cursor can move about the screen and
 * the screen can scroll and be erased), one line open (on dumb glass-crt's
 * like the adm3), and hardcopy open (for everything else).
 *
 * The basic state is given by bastate, and the current state by state,
 * since we can be in pseudo-hardcopy mode if we are on an adm3 and the
 * line is longer than 80.
 */

var	short	bastate;
var	short	state;

#define	VISUAL		0
#define	CRTOPEN		1
#define	ONEOPEN		2
#define	HARDOPEN	3

/*
 * The screen in visual and crtopen is of varying size; the basic
 * window has top basWTOP and basWLINES lines are thereby implied.
 * The current window (which may have grown from the basic size)
 * has top WTOP and WLINES lines.  The top line of the window is WTOP,
 * and the bottom line WBOT.  The line WECHO is used for messages,
 * search strings and the like.  If WBOT==WECHO then we are in ONEOPEN
 * or HARDOPEN and there is no way back to the line we were on if we
 * go to WECHO (i.e. we will have to scroll before we go there, and
 * we can't get back).  There are WCOLS columns per line.
 * If WBOT!=WECHO then WECHO will be the last line on the screen
 * and WBOT is the line before it.
 */
var	short	basWTOP;
var	short	basWLINES;
var	short	WTOP;
var	short	WBOT;
var	short	WLINES;
var	short	WCOLS;
var	short	WECHO;

/*
 * When we are dealing with the echo area we consider the window
 * to be "split" and set the variable splitw.  Otherwise, moving
 * off the bottom of the screen into WECHO causes a screen rollup.
 */
var	bool	splitw;

/*
 * Information about each line currently on the screen includes
 * the y coordinate associated with the line, the printing depth
 * of the line (0 indicates unknown), and a mask which indicates
 * whether the line is "unclean", i.e. whether we should check
 * to make sure the line is displayed correctly at the next
 * appropriate juncture.
 */
struct vlinfo {
	short	vliny;		/* Y coordinate */	/* mjm: was char */
	short	vdepth;		/* Depth of displayed line */ /*mjm: was char */
	short	vflags;		/* Is line potentially dirty ? */
};
var	struct vlinfo  vlinfo[TUBELINES + 2];

#define	DEPTH(c)	(vlinfo[c].vdepth)
#define	LINE(c)		(vlinfo[c].vliny)
#define	FLAGS(c)	(vlinfo[c].vflags)

#define	VDIRT	1

/*
 * Hacks to copy vlinfo structures around
 */
#ifdef	V6
	/* Kludge to make up for no structure assignment */
	struct {
		long	longi;
	};
#	define	vlcopy(i, j)	i.longi = j.longi
#else
#	define	vlcopy(i, j)	i = j;
#endif

/*
 * The current line on the screen is represented by vcline.
 * There are vcnt lines on the screen, the last being "vcnt - 1".
 * Vcline is intimately tied to the current value of dot,
 * and when command mode is used as a subroutine fancy footwork occurs.
 */
var	short	vcline;
var	short	vcnt;

/*
 * To allow many optimizations on output, an exact image of the terminal
 * screen is maintained in the space addressed by vtube0.  The vtube
 * array indexes this space as lines, and is shuffled on scrolls, insert+delete
 * lines and the like rather than (more expensively) shuffling the screen
 * data itself.  It is also rearranged during insert mode across line
 * boundaries to make incore work easier.
 */
var	char	*vtube[TUBELINES];
var	char	*vtube0;

/*
 * The current cursor position within the current line is kept in
 * cursor.  The current line is kept in linebuf.  During insertions
 * we use the auxiliary array genbuf as scratch area.
 * The cursor wcursor and wdot are used in operations within/spanning
 * lines to mark the other end of the affected area, or the target
 * for a motion.
 */
var	char	*cursor;
var	char	*wcursor;
var	line	*wdot;

/*
 * Undo information is saved in a LBSIZE buffer at "vutmp" for changes
 * within the current line, or as for command mode for multi-line changes
 * or changes on lines no longer the current line.
 * The change kind "VCAPU" is used immediately after a U undo to prevent
 * two successive U undo's from destroying the previous state.
 */
#define	VNONE	0
#define	VCHNG	1
#define	VMANY	2
#define	VCAPU	3
#define	VMCHNG	4
#define	VMANYINS 5

var	short	vundkind;	/* Which kind of undo - from above */
var	char	*vutmp;		/* Prev line image when "VCHNG" */

/*
 * State information for undoing of macros.  The basic idea is that
 * if the macro does only 1 change or even none, we don't treat it
 * specially.  If it does 2 or more changes we want to be able to
 * undo it as a unit.  We remember how many changes have been made
 * within the current macro.  (Remember macros can be nested.)
 */
#define VC_NOTINMAC	0	/* Not in a macro */
#define VC_NOCHANGE	1	/* In a macro, no changes so far */
#define VC_ONECHANGE	2	/* In a macro, one change so far */
#define VC_MANYCHANGE	3	/* In a macro, at least 2 changes so far */

var	short	vch_mac;	/* Change state - one of the above */

/*
 * For U undo's the line is grabbed by "vmove" after it first appears
 * on that line.  The "vUNDdot" which specifies which line has been
 * saved is selectively cleared when changes involving other lines
 * are made, i.e. after a 'J' join.  This is because a 'JU' would
 * lose completely the text of the line just joined on.
 */
var	char	*vUNDcurs;	/* Cursor just before 'U' */
var	line	*vUNDdot;	/* The line address of line saved in vUNDsav */
var	line	vUNDsav;	/* Grabbed initial "*dot" */

#define	killU()		vUNDdot = NOLINE

/*
 * There are a number of cases where special behaviour is needed
 * from deeply nested routines.  This is accomplished by setting
 * the bits of hold, which acts to change the state of the general
 * visual editing behaviour in specific ways.
 *
 * HOLDAT prevents the clreol (clear to end of line) routines from
 * putting out @'s or ~'s on empty lines.
 *
 * HOLDDOL prevents the reopen routine from putting a '$' at the
 * end of a reopened line in list mode (for hardcopy mode, e.g.).
 *
 * HOLDROL prevents spurious blank lines when scrolling in hardcopy
 * open mode.
 *
 * HOLDQIK prevents the fake insert mode during repeated commands.
 *
 * HOLDPUPD prevents updating of the physical screen image when
 * mucking around while in insert mode.
 *
 * HOLDECH prevents clearing of the echo area while rolling the screen
 * backwards (e.g.) in deference to the clearing of the area at the
 * end of the scroll (1 time instead of n times).  The fact that this
 * is actually needed is recorded in heldech, which says that a clear
 * of the echo area was actually held off.
 */
var	short	hold;
var	short	holdupd;	/* Hold off update when echo line is too long */

#define	HOLDAT		1
#define	HOLDDOL		2
#define	HOLDROL		4
#define	HOLDQIK		8
#define	HOLDPUPD	16
#define	HOLDECH		32
#define HOLDWIG		64

/*
 * Miscellaneous variables
 */
var	short	CDCNT;		/* Count of ^D's in insert on this line */
var	char	DEL[VBSIZE];	/* Last deleted text */
var	bool	HADUP;		/* This insert line started with ^ then ^D */
var	bool	HADZERO;	/* This insert line started with 0 then ^D */
var	char	INS[VBSIZE];	/* Last inserted text */
var	int	Vlines;		/* Number of file lines "before" vi command */
var	int	Xcnt;		/* External variable holding last cmd's count */
var	bool	Xhadcnt;	/* Last command had explicit count? */
var	short	ZERO;
var	short	dir;		/* Direction for search (+1 or -1) */
var	short	doomed;		/* Disply chars right of cursor to be killed */
var	bool	gobblebl;	/* Wrapmargin space generated nl, eat a space */
var	bool	hadcnt;		/* (Almost) internal to vmain() */
var	bool	heldech;	/* We owe a clear of echo area */
var	bool	insmode;	/* Are in character insert mode */
var	char	lastcmd[5];	/* Chars in last command */
var	int	lastcnt;	/* Count for last command */
var	char	*lastcp;	/* Save current command here to repeat */
var	bool	lasthad;	/* Last command had a count? */
var	short	lastvgk;	/* Previous input key, if not from keyboard */
var	short	lastreg;	/* Register with last command */
var	char	*ncols['z'-'a'+2];	/* Cursor positions of marks */
var	char	*notenam;	/* Name to be noted with change count */
var	char	*notesgn;	/* Change count from last command */
var	char	op;		/* Operation of current command */
var	short	Peekkey;	/* Peek ahead key */
var	bool	rubble;		/* Line is filthy (in hardcopy open), redraw! */
var	int	vSCROLL;	/* Number lines to scroll on ^D/^U */
var	char	*vglobp;	/* Untyped input (e.g. repeat insert text) */
var	char	vmacbuf[VBSIZE];   /* Text of visual macro, hence nonnestable */
var	char	*vmacp;		/* Like vglobp but for visual macros */
var	char	*vmcurs;	/* Cursor for restore after undo d), e.g. */
var	short	vmovcol;	/* Column to try to keep on arrow keys */
var	bool	vmoving;	/* Are trying to keep vmovcol */
var	short	vreg;		/* Reg for this command */   /* mjm: was char */
var	short	wdkind;		/* Liberal/conservative words? */
var	char	workcmd[5];	/* Temporary for lastcmd */


/*
 * Macros
 */
#define	INF		30000
#define	LASTLINE	LINE(vcnt)
#define	OVERBUF		QUOTE
#define	beep		obeep
#define	cindent()	((outline - vlinfo[vcline].vliny) * WCOLS + outcol)
#define	vputp(cp, cnt)	tputs(cp, cnt, vputch)
#define	vputc(c)	putch(c)

/*
 * Function types
 */
int	beep();
int	qcount();
int	vchange();
int	vdelete();
int	vgrabit();
int	vinschar();
int	vmove();
int	vputchar();
int	vshift();
int	vyankit();