/*      $OpenBSD: ex_edit.c,v 1.6 2014/11/12 04:28:41 bentley 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 <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

static int ex_N_edit(SCR *, EXCMD *, FREF *, int);

/*
 * ex_edit --   :e[dit][!] [+cmd] [file]
 *              :ex[!] [+cmd] [file]
 *              :vi[sual][!] [+cmd] [file]
 *
 * Edit a file; if none specified, re-edit the current file.  The third
 * form of the command can only be executed while in vi mode.  See the
 * hack in ex.c:ex_cmd().
 *
 * !!!
 * Historic vi didn't permit the '+' command form without specifying
 * a file name as well.  This seems unreasonable, so we support it
 * regardless.
 *
 * PUBLIC: int ex_edit(SCR *, EXCMD *);
 */
int
ex_edit(SCR *sp, EXCMD *cmdp)
{
        FREF *frp;
        int attach, setalt;

        switch (cmdp->argc) {
        case 0:
                /*
                 * If the name has been changed, we edit that file, not the
                 * original name.  If the user was editing a temporary file
                 * (or wasn't editing any file), create another one.  The
                 * reason for not reusing temporary files is that there is
                 * special exit processing of them, and reuse is tricky.
                 */
                frp = sp->frp;
                if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
                        if ((frp = file_add(sp, NULL)) == NULL)
                                return (1);
                        attach = 0;
                } else
                        attach = 1;
                setalt = 0;
                break;
        case 1:
                if ((frp = file_add(sp, cmdp->argv[0]->bp)) == NULL)
                        return (1);
                attach = 0;
                setalt = 1;
                set_alt_name(sp, cmdp->argv[0]->bp);
                break;
        default:
                abort();
        }

        if (F_ISSET(cmdp, E_NEWSCREEN))
                return (ex_N_edit(sp, cmdp, frp, attach));

        /*
         * Check for modifications.
         *
         * !!!
         * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
         */
        if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
                return (1);

        /* Switch files. */
        if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
            (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
                return (1);

        F_SET(sp, SC_FSWITCH);
        return (0);
}

/*
 * ex_N_edit --
 *      New screen version of ex_edit.
 */
static int
ex_N_edit(SCR *sp, EXCMD *cmdp, FREF *frp, int attach)
{
        SCR *new;

        /* Get a new screen. */
        if (screen_init(sp->gp, sp, &new))
                return (1);
        if (vs_split(sp, new, 0)) {
                (void)screen_end(new);
                return (1);
        }

        /* Get a backing file. */
        if (attach) {
                /* Copy file state, keep the screen and cursor the same. */
                new->ep = sp->ep;
                ++new->ep->refcnt;

                new->frp = frp;
                new->frp->flags = sp->frp->flags;

                new->lno = sp->lno;
                new->cno = sp->cno;
        } else if (file_init(new, frp, NULL,
            (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
                (void)vs_discard(new, NULL);
                (void)screen_end(new);
                return (1);
        }

        /* Create the argument list. */
        new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);

        /* Set up the switch. */
        sp->nextdisp = new;
        F_SET(sp, SC_SSWITCH);

        return (0);
}