/*      $OpenBSD: ex_visual.c,v 1.10 2016/01/06 22:28:52 millert 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(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,
            "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);
}