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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: ex_visual.c,v 1.8 2009/10/27 23:59:47 deraadt Exp $	*/

/*-
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>

#include <bitstring.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "../common/common.h"
#include "../vi/vi.h"

/*
 * ex_visual -- :[line] vi[sual] [^-.+] [window_size] [flags]
 *	Switch to visual mode.
 *
 * PUBLIC: int ex_visual(SCR *, EXCMD *);
 */
int
ex_visual(sp, cmdp)
	SCR *sp;
	EXCMD *cmdp;
{
	SCR *tsp;
	size_t len;
	int pos;
	char buf[256];

	/* If open option off, disallow visual command. */
	if (!O_ISSET(sp, O_OPEN)) {
		msgq(sp, M_ERR,
	    "175|The visual command requires that the open option be set");
		return (1);
	}

	/* Move to the address. */
	sp->lno = cmdp->addr1.lno == 0 ? 1 : cmdp->addr1.lno;

	/*
	 * Push a command based on the line position flags.  If no
	 * flag specified, the line goes at the top of the screen.
	 */
	switch (FL_ISSET(cmdp->iflags,
	    E_C_CARAT | E_C_DASH | E_C_DOT | E_C_PLUS)) {
	case E_C_CARAT:
		pos = '^';
		break;
	case E_C_DASH:
		pos = '-';
		break;
	case E_C_DOT:
		pos = '.';
		break;
	case E_C_PLUS:
		pos = '+';
		break;
	default:
		sp->frp->lno = sp->lno;
		sp->frp->cno = 0;
		(void)nonblank(sp, sp->lno, &sp->cno);
		F_SET(sp->frp, FR_CURSORSET);
		goto nopush;
	}

	if (FL_ISSET(cmdp->iflags, E_C_COUNT))
		len = snprintf(buf, sizeof(buf),
		     "%luz%c%lu", (ulong)sp->lno, pos, cmdp->count);
	else
		len = snprintf(buf, sizeof(buf), "%luz%c", (ulong)sp->lno, pos);
	if (len >= sizeof(buf))
		len = sizeof(buf) - 1;
	(void)v_event_push(sp, NULL, buf, len, CH_NOMAP | CH_QUOTED);

	/*
	 * !!!
	 * Historically, if no line address was specified, the [p#l] flags
	 * caused the cursor to be moved to the last line of the file, which
	 * was then positioned as described above.  This seems useless, so
	 * I haven't implemented it.
	 */
	switch (FL_ISSET(cmdp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT)) {
	case E_C_HASH:
		O_SET(sp, O_NUMBER);
		break;
	case E_C_LIST:
		O_SET(sp, O_LIST);
		break;
	case E_C_PRINT:
		break;
	}

nopush:	/*
	 * !!!
	 * You can call the visual part of the editor from within an ex
	 * global command.
	 *
	 * XXX
	 * Historically, undoing a visual session was a single undo command,
	 * i.e. you could undo all of the changes you made in visual mode.
	 * We don't get this right; I'm waiting for the new logging code to
	 * be available.
	 *
	 * It's explicit, don't have to wait for the user, unless there's
	 * already a reason to wait.
	 */
	if (!F_ISSET(sp, SC_SCR_EXWROTE))
		F_SET(sp, SC_EX_WAIT_NO);

	if (F_ISSET(sp, SC_EX_GLOBAL)) {
		/*
		 * When the vi screen(s) exit, we don't want to lose our hold
		 * on this screen or this file, otherwise we're going to fail
		 * fairly spectacularly.
		 */
		++sp->refcnt;
		++sp->ep->refcnt;

		/*
		 * Fake up a screen pointer -- vi doesn't get to change our
		 * underlying file, regardless.
		 */
		tsp = sp;
		if (vi(&tsp))
			return (1);

		/*
		 * !!!
		 * Historically, if the user exited the vi screen(s) using an
		 * ex quit command (e.g. :wq, :q) ex/vi exited, it was only if
		 * they exited vi using the Q command that ex continued.  Some
		 * early versions of nvi continued in ex regardless, but users
		 * didn't like the semantic.
		 *
		 * Reset the screen.
		 */
		if (ex_init(sp))
			return (1);

		/* Move out of the vi screen. */
		(void)ex_puts(sp, "\n");
	} else {
		F_CLR(sp, SC_EX | SC_SCR_EX);
		F_SET(sp, SC_VI);
	}
	return (0);
}