dist/nvi/ex/ex_visual.c

   1 /*      $NetBSD: ex_visual.c,v 1.1.1.2 2008/05/18 14:31:21 aymeric Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   7  *      Keith Bostic.  All rights reserved.
   8  *
   9  * See the LICENSE file for redistribution information.
  10  */
  11
  12 #include "config.h"
  13
  14 #ifndef lint
  15 static const char sccsid[] = "Id: ex_visual.c,v 10.16 2001/08/29 11:04:13 skimo Exp (Berkeley) Date: 2001/08/29 11:04:13";
  16 #endif /* not lint */
  17
  18 #include <sys/types.h>
  19 #include <sys/queue.h>
  20 #include <sys/time.h>
  21
  22 #include <bitstring.h>
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28
  29 #include "../common/common.h"
  30 #include "../vi/vi.h"
  31
  32 /*
  33  * ex_visual -- :[line] vi[sual] [^-.+] [window_size] [flags]
  34  *      Switch to visual mode.
  35  *
  36  * PUBLIC: int ex_visual __P((SCR *, EXCMD *));
  37  */
  38 int
  39 ex_visual(SCR *sp, EXCMD *cmdp)
  40 {
  41         SCR *tsp;
  42         size_t len;
  43         int pos;
  44         char buf[256];
  45         size_t wlen;
  46         const CHAR_T *wp;
  47
  48         /* If open option off, disallow visual command. */
  49         if (!O_ISSET(sp, O_OPEN)) {
  50                 msgq(sp, M_ERR,
  51             "175|The visual command requires that the open option be set");
  52                 return (1);
  53         }
  54
  55         /* Move to the address. */
  56         sp->lno = cmdp->addr1.lno == 0 ? 1 : cmdp->addr1.lno;
  57
  58         /*
  59          * Push a command based on the line position flags.  If no
  60          * flag specified, the line goes at the top of the screen.
  61          */
  62         switch (FL_ISSET(cmdp->iflags,
  63             E_C_CARAT | E_C_DASH | E_C_DOT | E_C_PLUS)) {
  64         case E_C_CARAT:
  65                 pos = '^';
  66                 break;
  67         case E_C_DASH:
  68                 pos = '-';
  69                 break;
  70         case E_C_DOT:
  71                 pos = '.';
  72                 break;
  73         case E_C_PLUS:
  74                 pos = '+';
  75                 break;
  76         default:
  77                 sp->frp->lno = sp->lno;
  78                 sp->frp->cno = 0;
  79                 (void)nonblank(sp, sp->lno, &sp->cno);
  80                 F_SET(sp->frp, FR_CURSORSET);
  81                 goto nopush;
  82         }
  83
  84         if (FL_ISSET(cmdp->iflags, E_C_COUNT))
  85                 len = snprintf(buf, sizeof(buf),
  86                     "%luz%c%lu", (unsigned long)sp->lno, pos, cmdp->count);
  87         else
  88                 len = snprintf(buf, sizeof(buf),
  89                     "%luz%c", (unsigned long)sp->lno, pos);
  90         CHAR2INT(sp, buf, len, wp, wlen);
  91         (void)v_event_push(sp, NULL, wp, wlen, CH_NOMAP | CH_QUOTED);
  92
  93         /*
  94          * !!!
  95          * Historically, if no line address was specified, the [p#l] flags
  96          * caused the cursor to be moved to the last line of the file, which
  97          * was then positioned as described above.  This seems useless, so
  98          * I haven't implemented it.
  99          */
 100         switch (FL_ISSET(cmdp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT)) {
 101         case E_C_HASH:
 102                 O_SET(sp, O_NUMBER);
 103                 break;
 104         case E_C_LIST:
 105                 O_SET(sp, O_LIST);
 106                 break;
 107         case E_C_PRINT:
 108                 break;
 109         }
 110
 111 nopush: /*
 112          * !!!
 113          * You can call the visual part of the editor from within an ex
 114          * global command.
 115          *
 116          * XXX
 117          * Historically, undoing a visual session was a single undo command,
 118          * i.e. you could undo all of the changes you made in visual mode.
 119          * We don't get this right; I'm waiting for the new logging code to
 120          * be available.
 121          *
 122          * It's explicit, don't have to wait for the user, unless there's
 123          * already a reason to wait.
 124          */
 125         if (!F_ISSET(sp, SC_SCR_EXWROTE))
 126                 F_SET(sp, SC_EX_WAIT_NO);
 127
 128         if (F_ISSET(sp, SC_EX_GLOBAL)) {
 129                 /*
 130                  * When the vi screen(s) exit, we don't want to lose our hold
 131                  * on this screen or this file, otherwise we're going to fail
 132                  * fairly spectacularly.
 133                  */
 134                 ++sp->refcnt;
 135                 ++sp->ep->refcnt;
 136                 /* XXXX where is this decremented ? */
 137
 138                 /*
 139                  * Fake up a screen pointer -- vi doesn't get to change our
 140                  * underlying file, regardless.
 141                  */
 142                 tsp = sp;
 143                 if (vi(&tsp))
 144                         return (1);
 145
 146                 /*
 147                  * !!!
 148                  * Historically, if the user exited the vi screen(s) using an
 149                  * ex quit command (e.g. :wq, :q) ex/vi exited, it was only if
 150                  * they exited vi using the Q command that ex continued.  Some
 151                  * early versions of nvi continued in ex regardless, but users
 152                  * didn't like the semantic.
 153                  *
 154                  * Reset the screen.
 155                  */
 156                 if (ex_init(sp))
 157                         return (1);
 158
 159                 /* Move out of the vi screen. */
 160                 (void)ex_puts(sp, "\n");
 161         } else {
 162                 F_CLR(sp, SC_EX | SC_SCR_EX);
 163                 F_SET(sp, SC_VI);
 164         }
 165         return (0);
 166 }