/*      $OpenBSD: v_at.c,v 1.11 2016/05/27 09:18:12 martijn 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 <ctype.h>
#include <limits.h>
#include <stdio.h>

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

/*
 * v_at -- @
 *      Execute a buffer.
 *
 * PUBLIC: int v_at(SCR *, VICMD *);
 */
int
v_at(SCR *sp, VICMD *vp)
{
        CB *cbp;
        CHAR_T name;
        TEXT *tp;
        size_t len;
        char nbuf[20];

        /*
         * !!!
         * Historically, [@*]<carriage-return> and [@*][@*] executed the most
         * recently executed buffer in ex mode.  In vi mode, only @@ repeated
         * the last buffer.  We change historic practice and make @* work from
         * vi mode as well, it's simpler and more consistent.
         *
         * My intent is that *[buffer] will, in the future, pass the buffer to
         * whatever interpreter is loaded.
         */
        name = F_ISSET(vp, VC_BUFFER) ? vp->buffer : '@';
        if (name == '@' || name == '*') {
                if (!F_ISSET(sp, SC_AT_SET)) {
                        ex_emsg(sp, NULL, EXM_NOPREVBUF);
                        return (1);
                }
                name = sp->at_lbuf;
        }
        F_SET(sp, SC_AT_SET);

        CBNAME(sp, cbp, name);
        if (cbp == NULL) {
                ex_emsg(sp, KEY_NAME(sp, name), EXM_EMPTYBUF);
                return (1);
        }

        /* Save for reuse. */
        sp->at_lbuf = name;

        /*
         * The buffer is executed in vi mode, while in vi mode, so simply
         * push it onto the terminal queue and continue.
         *
         * !!!
         * Historic practice is that if the buffer was cut in line mode,
         * <newlines> were appended to each line as it was pushed onto
         * the stack.  If the buffer was cut in character mode, <newlines>
         * were appended to all lines but the last one.
         *
         * XXX
         * Historic practice is that execution of an @ buffer could be
         * undone by a single 'u' command, i.e. the changes were grouped
         * together.  We don't get this right; I'm waiting for the new DB
         * logging code to be available.
         */
        TAILQ_FOREACH_REVERSE(tp, &cbp->textq, _texth, q)
                if (((F_ISSET(cbp, CB_LMODE) || TAILQ_NEXT(tp, q)) &&
                    v_event_push(sp, NULL, "\n", 1, 0)) ||
                    v_event_push(sp, NULL, tp->lb, tp->len, 0))
                        return (1);

        /*
         * !!!
         * If any count was supplied, it applies to the first command in the
         * at buffer.
         */
        if (F_ISSET(vp, VC_C1SET)) {
                len = snprintf(nbuf, sizeof(nbuf), "%lu", vp->count);
                if (len >= sizeof(nbuf))
                        len = sizeof(nbuf) - 1;
                if (v_event_push(sp, NULL, nbuf, len, 0))
                        return (1);
        }
        return (0);
}