vi.c

minix软件源代码

/* vi.c */

/* Author:
 *	Steve Kirkendall
 *	Beaverton, OR 97005
 *	[e-mail]
 */


#include "config.h"
#include "ctype.h"
#include "vi.h"



/* This array describes what each key does */
#define NO_FUNC		(MARK (*)())0

#define NO_ARGS		0
#define CURSOR		1
#define CURSOR_CNT_KEY	2
#define CURSOR_MOVED	3
#define CURSOR_EOL	4
#define ZERO		5
#define DIGIT		6
#define CURSOR_TEXT	7
#define KEYWORD		8
#define ARGSMASK	0x0f
#define	C_C_K_REP1	(CURSOR_CNT_KEY | 0x10)
#define C_C_K_CUT	(CURSOR_CNT_KEY | 0x20)
#define C_C_K_MARK	(CURSOR_CNT_KEY | 0x30)
#define C_C_K_CHAR	(CURSOR_CNT_KEY | 0x40)
#ifndef NO_SHOWMODE
static int keymodes[] = {0, WHEN_REP1, WHEN_CUT, WHEN_MARK, WHEN_CHAR};
# define KEYMODE(args) (keymodes[(args) >> 4])
#else
# define KEYMODE(args) 0
#endif

static struct keystru
{
	MARK	(*func)();	/* the function to run */
	uchar	args;		/* description of the args needed */
#ifndef NO_VISIBLE
	short	flags;
#else
	uchar	flags;		/* other stuff */
#endif
}
	vikeys[] =
{
/* NUL not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#ifndef NO_EXTENSIONS
/* ^A  find cursor word */	{m_wsrch,	KEYWORD,	MVMT|NREL|VIZ},
#else
/* ^A  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/* ^B  page backward	*/	{m_scroll,	CURSOR,		FRNT|VIZ},
/* ^C  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^D  scroll dn 1/2page*/	{m_scroll,	CURSOR,		NCOL|VIZ},
/* ^E  scroll up	*/	{m_scroll,	CURSOR,		NCOL|VIZ},
/* ^F  page forward	*/	{m_scroll,	CURSOR,		FRNT|VIZ},
/* ^G  show file status	*/	{v_status,	NO_ARGS, 	NO_FLAGS},
/* ^H  move left, like h*/	{m_left,	CURSOR,		MVMT|VIZ},
/* ^I  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^J  move down	*/	{m_updnto,	CURSOR,		MVMT|LNMD|VIZ|INCL},
/* ^K  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^L  redraw screen	*/	{v_redraw,	NO_ARGS,	NO_FLAGS|VIZ},
/* ^M  mv front next ln */	{m_updnto,	CURSOR,		MVMT|FRNT|LNMD|VIZ|INCL},
/* ^N  move down	*/	{m_updnto,	CURSOR,		MVMT|LNMD|VIZ|INCL|NCOL},
/* ^O  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^P  move up		*/	{m_updnto,	CURSOR,		MVMT|LNMD|VIZ|INCL|NCOL},
/* ^Q  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^R  redraw screen	*/	{v_redraw,	NO_ARGS,	NO_FLAGS|VIZ},
/* ^S  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^T  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^U  scroll up 1/2page*/	{m_scroll,	CURSOR,		NCOL|VIZ},
/* ^V  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^W  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^X  move to phys col	*/	{m_tocol,	CURSOR,		MVMT|NREL|VIZ},
/* ^Y  scroll down	*/	{m_scroll,	CURSOR,		NCOL|VIZ},
#ifdef SIGTSTP
/* ^Z  suspend elvis	*/	{v_suspend,	NO_ARGS,	NO_FLAGS},
#else
/* ^Z  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/* ESC not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^\  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* ^]  keyword is tag	*/	{v_tag,		KEYWORD,	NO_FLAGS},
/* ^^  previous file	*/	{v_switch,	CURSOR,		NO_FLAGS},
/* ^_  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/* SPC move right,like l*/	{m_right,	CURSOR,		MVMT|INCL|VIZ},
/*  !  run thru filter	*/	{v_filter,	CURSOR_MOVED,	FRNT|LNMD|INCL|VIZ},
/*  "  select cut buffer*/	{v_selcut,	C_C_K_CUT,	PTMV|VIZ},
#ifndef NO_EXTENSIONS
/*  #  increment number	*/	{v_increment,	KEYWORD,	SDOT},
#else
/*  #  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  $  move to rear	*/	{m_rear,	CURSOR,		MVMT|INCL|VIZ},
/*  %  move to match	*/	{m_match,	CURSOR,		MVMT|INCL|VIZ},
/*  &  repeat subst	*/	{v_again,	CURSOR_MOVED,	SDOT|NCOL|LNMD|INCL},
/*  '  move to a mark	*/	{m_tomark,	C_C_K_MARK,	MVMT|FRNT|NREL|LNMD|INCL|VIZ},
#ifndef NO_SENTENCE
/*  (  mv back sentence	*/	{m_sentence,	CURSOR,		MVMT|VIZ},
/*  )  mv fwd sentence	*/	{m_sentence,	CURSOR,		MVMT|VIZ},
#else
/*  (  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/*  )  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
#ifndef NO_ERRLIST
/*  *  errlist		*/	{v_errlist,	CURSOR,		FRNT|NREL},
#else
/*  *  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  +  mv front next ln */	{m_updnto,	CURSOR,		MVMT|FRNT|LNMD|VIZ|INCL},
#ifndef NO_CHARSEARCH
/*  ,  reverse [fFtT] cmd*/	{m__ch,		CURSOR,		MVMT|INCL|VIZ},
#else
/*  ,  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  -  mv front prev ln	*/	{m_updnto,	CURSOR,		MVMT|FRNT|LNMD|VIZ|INCL},
/*  .  special...	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/*  /  forward search	*/	{m_fsrch,	CURSOR_TEXT,	MVMT|NREL|VIZ},
/*  0  part of count?	*/	{NO_FUNC,	ZERO,		MVMT|PTMV|VIZ},
/*  1  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  2  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  3  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  4  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  5  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  6  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  7  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  8  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  9  part of count	*/	{NO_FUNC,	DIGIT,		PTMV|VIZ},
/*  :  run single EX cmd*/	{v_1ex,		CURSOR_TEXT,	NO_FLAGS},
#ifndef NO_CHARSEARCH
/*  ;  repeat [fFtT] cmd*/	{m__ch,		CURSOR,		MVMT|INCL|VIZ},
#else
/*  ;  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS|VIZ},
#endif
/*  <  shift text left	*/	{v_lshift,	CURSOR_MOVED,	SDOT|FRNT|LNMD|INCL|VIZ},
/*  =  preset filter	*/	{v_reformat,	CURSOR_MOVED,	SDOT|FRNT|LNMD|INCL|VIZ},
/*  >  shift text right	*/	{v_rshift,	CURSOR_MOVED,	SDOT|FRNT|LNMD|INCL|VIZ},
/*  ?  backward search	*/	{m_bsrch,	CURSOR_TEXT,	MVMT|NREL|VIZ},
#ifndef NO_AT
/*  @  execute a cutbuf */	{v_at,		C_C_K_CUT,	NO_FLAGS},
#else
/*  @  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  A  append at EOL	*/	{v_insert,	CURSOR,		SDOT},
/*  B  move back Word	*/	{m_bword,	CURSOR,		MVMT|VIZ},
/*  C  change to EOL	*/	{v_change,	CURSOR_EOL,	SDOT},
/*  D  delete to EOL	*/	{v_delete,	CURSOR_EOL,	SDOT},
/*  E  move end of Word	*/	{m_eword,	CURSOR,		MVMT|INCL|VIZ},
#ifndef NO_CHARSEARCH
/*  F  move bk to char	*/	{m_Fch,		C_C_K_CHAR,	MVMT|INCL|VIZ},
#else
/*  F  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  G  move to line #	*/	{m_updnto,	CURSOR,		MVMT|NREL|LNMD|FRNT|INCL|VIZ},
/*  H  move to row	*/	{m_row,		CURSOR,		MVMT|LNMD|FRNT|VIZ|INCL},
/*  I  insert at front	*/	{v_insert,	CURSOR,		SDOT},
/*  J  join lines	*/	{v_join,	CURSOR,		SDOT},
#ifndef NO_EXTENSIONS
/*  K  look up keyword	*/	{v_keyword,	KEYWORD,	NO_FLAGS},
#else
/*  K  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  L  move to last row	*/	{m_row,		CURSOR,		MVMT|LNMD|FRNT|VIZ|INCL},
/*  M  move to mid row	*/	{m_row,		CURSOR,		MVMT|LNMD|FRNT|VIZ|INCL},
/*  N  reverse prev srch*/	{m_Nsrch,	CURSOR,		MVMT|NREL|VIZ},
/*  O  insert above line*/	{v_insert,	CURSOR,		SDOT},
/*  P  paste before	*/	{v_paste,	CURSOR,		SDOT},
/*  Q  quit to EX mode	*/	{v_quit,	NO_ARGS,	NO_FLAGS},
/*  R  overtype		*/	{v_overtype,	CURSOR,		SDOT},
/*  S  change line	*/	{v_change,	CURSOR_MOVED,	SDOT},
#ifndef NO_CHARSEARCH
/*  T  move bk to char	*/	{m_Tch,		C_C_K_CHAR,	MVMT|INCL|VIZ},
#else
/*  T  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  U  undo whole line	*/	{v_undoline,	CURSOR,		FRNT},
#ifndef NO_VISIBLE
/*  V  start visible	*/	{v_start,	CURSOR,		INCL|LNMD|VIZ},
#else
/*  V  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  W  move forward Word*/	{m_fword,	CURSOR,		MVMT|INCL|VIZ},
/*  X  delete to left	*/	{v_xchar,	CURSOR,		SDOT},
/*  Y  yank text	*/	{v_yank,	CURSOR_MOVED,	NCOL},
/*  Z  save file & exit	*/	{v_xit,		CURSOR_CNT_KEY,	NO_FLAGS},
/*  [  move back section*/	{m_paragraph,	CURSOR,		MVMT|LNMD|NREL|VIZ},
#ifndef NO_POPUP
/*  \  pop-up menu	*/	{v_popup,	CURSOR_MOVED,	VIZ},
#else
/*  \  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  ]  move fwd section */	{m_paragraph,	CURSOR,		MVMT|LNMD|NREL|VIZ},
/*  ^  move to front	*/	{m_front,	CURSOR,		MVMT|VIZ},
/*  _  current line	*/	{m_updnto,	CURSOR,		MVMT|LNMD|FRNT|INCL},
/*  `  move to mark	*/	{m_tomark,	C_C_K_MARK,	MVMT|NREL|VIZ},
/*  a  append at cursor	*/	{v_insert,	CURSOR,		SDOT},
/*  b  move back word	*/	{m_bword,	CURSOR,		MVMT|VIZ},
/*  c  change text	*/	{v_change,	CURSOR_MOVED,	SDOT|VIZ},
/*  d  delete op	*/	{v_delete,	CURSOR_MOVED,	SDOT|VIZ},
/*  e  move end word	*/	{m_eword,	CURSOR,		MVMT|INCL|VIZ},
#ifndef NO_CHARSEARCH
/*  f  move fwd for char*/	{m_fch,		C_C_K_CHAR,	MVMT|INCL|VIZ},
#else
/*  f  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  g  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/*  h  move left	*/	{m_left,	CURSOR,		MVMT|VIZ},
/*  i  insert at cursor	*/	{v_insert,	CURSOR,		SDOT},
/*  j  move down	*/	{m_updnto,	CURSOR,		MVMT|NCOL|LNMD|VIZ|INCL},
/*  k  move up		*/	{m_updnto,	CURSOR,		MVMT|NCOL|LNMD|VIZ|INCL},
/*  l  move right	*/	{m_right,	CURSOR,		MVMT|INCL|VIZ},
/*  m  define a mark	*/	{v_mark,	C_C_K_MARK,	NO_FLAGS},
/*  n  repeat prev srch	*/	{m_nsrch,	CURSOR, 	MVMT|NREL|VIZ},
/*  o  insert below line*/	{v_insert,	CURSOR,		SDOT},
/*  p  paste after	*/	{v_paste,	CURSOR,		SDOT},
/*  q  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
/*  r  replace chars	*/	{v_replace,	C_C_K_REP1,	SDOT},
/*  s  subst N chars	*/	{v_subst,	CURSOR,		SDOT},
#ifndef NO_CHARSEARCH
/*  t  move fwd to char	*/	{m_tch,		C_C_K_CHAR,	MVMT|INCL|VIZ},
#else
/*  t  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  u  undo		*/	{v_undo,	CURSOR,		NO_FLAGS},
#ifndef NO_VISIBLE
/*  v  start visible	*/	{v_start,	CURSOR,		INCL|VIZ},
#else
/*  v  not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS},
#endif
/*  w  move fwd word	*/	{m_fword,	CURSOR,		MVMT|INCL|VIZ},
/*  x  delete character	*/	{v_xchar,	CURSOR,		SDOT},
/*  y  yank text	*/	{v_yank,	CURSOR_MOVED,	NCOL|VIZ},
/*  z  adjust scrn row	*/	{m_z, 		CURSOR_CNT_KEY,	NCOL|VIZ},
/*  {  back paragraph	*/	{m_paragraph,	CURSOR,		MVMT|LNMD|VIZ},
/*  |  move to column	*/	{m_tocol,	CURSOR,		MVMT|NREL|VIZ},
/*  }  fwd paragraph	*/	{m_paragraph,	CURSOR,		MVMT|LNMD|VIZ},
/*  ~  upper/lowercase	*/	{v_ulcase,	CURSOR,		SDOT},
/* DEL not defined	*/	{NO_FUNC,	NO_ARGS,	NO_FLAGS}
};



void vi()
{
	REG int			key;	/* keystroke from user */
	long			count;	/* numeric argument to some functions */
	REG struct keystru	*keyptr;/* pointer to vikeys[] element */
	MARK			tcurs;	/* temporary cursor */
	int			prevkey;/* previous key, if d/c/y/</>/! */
	MARK			range;	/* start of range for d/c/y/</>/! */
	char			text[132];
	int			dotkey;	/* last "key" of a change */
	int			dotpkey;/* last "prevkey" of a change */
	int			dotkey2;/* last extra "getkey()" of a change */
	int			dotcnt;	/* last "count" of a change */
	int			firstkey;
	REG int			i;

	/* tell the redraw() function to start from scratch */
	redraw(MARK_UNSET, FALSE);

#ifdef lint
	/* lint says that "range" might be used before it is set.  This
	 * can't really happen due to the way "range" and "prevkey" are used,
	 * but lint doesn't know that.  This line is here ONLY to keep lint
	 * happy.
	 */
	range = 0L;
#endif

	/* safeguard against '.' with no previous command */
	dotkey = dotpkey = dotkey2 = dotcnt = 0;

	/* go immediately into insert mode, if ":set inputmode" */
	firstkey = 0;
#ifndef NO_EXTENSIONS
	if (*o_inputmode)
	{
		firstkey = 'i';
	}
#endif

	/* Repeatedly handle VI commands */
	for (count = 0, prevkey = '\0'; mode == MODE_VI; )
	{
		/* if we've moved off the undoable line, then we can't undo it at all */
		if (markline(cursor) != U_line)
		{
			U_line = 0L;
		}

		/* report any changes from the previous command */
		if (rptlines >= *o_report)
		{
			redraw(cursor, FALSE);
			msg("%ld line%s %s", rptlines, (rptlines==1?"":"s"), rptlabel);
		}
		rptlines = 0L;

		/* get the next command key.  It must be ASCII */
		if (firstkey)
		{
			key = firstkey;
			firstkey = 0;
		}
		else
		{
			do
			{
				key = getkey(WHEN_VICMD);
			} while (key < 0 || key > 127);
		}

		/* Convert a doubled-up operator such as "dd" into "d_" */
		if (prevkey && key == prevkey)
		{
			key = '_';
		}

		/* look up the structure describing this command */
		keyptr = &vikeys[key];

		/* '&' and uppercase operators always act like doubled */
		if (!prevkey && keyptr->args == CURSOR_MOVED
			&& (key == '&' || isupper(key)))
		{
			range = cursor;
			prevkey = key;
			key = '_';
			keyptr = &vikeys[key];
		}

#ifndef NO_VISIBLE
		/* if we're in the middle of a v/V command, reject commands
		 * that aren't operators or movement commands
		 */
		if (V_from && !(keyptr->flags & VIZ))
		{
			beep();
			prevkey = 0;
			count = 0;
			continue;
		}
#endif

		/* if we're in the middle of a d/c/y/</>/! command, reject
		 * anything but movement.
		 */
		if (prevkey && !(keyptr->flags & (MVMT|PTMV)))
		{
			beep();
			prevkey = 0;
			count = 0;
			continue;
		}

		/* set the "dot" variables, if we're supposed to */
		if (((keyptr->flags & SDOT)
			|| (prevkey && vikeys[prevkey].flags & SDOT))
#ifndef NO_VISIBLE
		    && !V_from
#endif
		)
		{
			dotkey = key;
			dotpkey = prevkey;
			dotkey2 = '\0';
			dotcnt = count;

			/* remember the line before any changes are made */
			if (U_line != markline(cursor))
			{
				U_line = markline(cursor);
				strcpy(U_text, fetchline(U_line));
			}
		}

		/* if this is "." then set other vars from the "dot" vars */
		if (key == '.')
		{
			key = dotkey;
			keyptr = &vikeys[key];
			prevkey = dotpkey;
			if (prevkey)
			{
				range = cursor;
			}
			if (count == 0)
			{
				count = dotcnt;
			}
			doingdot = TRUE;

			/* remember the line before any changes are made */
			if (U_line != markline(cursor))
			{
				U_line = markline(cursor);
				strcpy(U_text, fetchline(U_line));
			}
		}
		else
		{