lynx-dev lynx2-8-1/Linux patch for new VTs

[Tony Garnock-Jones]

[[Sorry if this is a duplicate message. Something's a bit strange
  with my sendmail and I'm having to use a different account to
  reassure myself it's getting away okay.]]

Hi. I've been missing a feature that both Netscape and IE have - the
capability to open a new browser window to explore sublinks in. As I
run Lynx mostly on console on a Linux box, I decided to play with
implementing a "open new browser window" feature using the Linux
VT_??? ioctl()s.

It works, ish. Hitting control-O while Lynx is idling will first fork,
then find, open, and try to switch to a new VT. If Lynx is downloading
something, hitting control-O will fork, open the new VT as per normal,
and stop the download (as if 'z' had been pressed).

There's also the possibility that there's already a way of doing
something similar to what I want, without having to resort to the VT
ioctls (which are heavily festooned with warnings in the
manpages). <shrug>. It works for me :-)

It's a very naive implementation, obviously, and needs things like
proper autoconfing (or maybe a #define to control inclusion of the
feature). It is also deficient in that it is a patch against Lynx
version 2.8.1, rather than the latest developer release, or even
the latest stable version.

Other things to consider:
        * it has no user documentation. If you don't know the
          feature's there, you'll never find out :-)
        * I'd like to see it check to make sure Lynx is _actually_
          running on a Linux VT before it tries anything at all.
          For instance, if you're running under X, or maybe over
          a serial link or something, it will still fork() and try
          to open an unused VT.
        * A cool thing would be to extend the code so that it
          opened a new X window if you're running under X!
        * I run dual-headed console with an old MDA. I'd like to
          somehow hack it so it opens on the *other* monitor from
          the currently active one. Or maybe a separate key would
          make it try that strategy as distinct from the 'first-
          unused-VT-I-can-find' strategy.
        * Is it possible/easy to make those URLs which automatically
          open a new window with Netscape and IE work properly with
          something similar to my patch under Lynx? I don't even
          know how it's done with Netscape, so I'm not the right person
          to answer that question :-)

Comments? Please feel free to email me directly, address@hidden,
or reply to the list (of course). This is my first post, and I'm a very
new reader, so if I seem ignorant of basic issues (is there a lynx-dev
FAQ?), please be patient with me, and let me know where I've gone wrong.

The patch follows my signature.

Cheers,
  Tony
-- 
Anthony (Tony) James Garnock-Jones      address@hidden
[ Lazarus on IRC ]  - SPIRITUALIZED! -  [ http://kcbbs.gen.nz/users/tonyg/ ]
Student - Computer person: Linux, Languages, OS, Scheme, Smalltalk - Guitarist

CUT HERE
----------------------------------------------------------------------
Index: lynx/src/LYKeymap.c
diff -u lynx/src/LYKeymap.c:1.1.1.1 lynx/src/LYKeymap.c:1.2
--- lynx/src/LYKeymap.c:1.1.1.1 Sun Mar 28 23:03:22 1999
+++ lynx/src/LYKeymap.c Sun Mar 28 23:05:45 1999
@@ -32,7 +32,7 @@
 LYK_HISTORY,      LYK_NEXT_LINK,    LYK_ACTIVATE,  LYK_COOKIE_JAR,
 /* bs */            /* ht */        /* nl */       /* ^K */
 
-LYK_REFRESH,      LYK_ACTIVATE,     LYK_DOWN_TWO,      0,
+LYK_REFRESH,      LYK_ACTIVATE,     LYK_DOWN_TWO,      LYK_NEW_BROWSER,
 /* ^L */            /* cr */        /* ^N */       /* ^O */
 
 LYK_UP_TWO,             0,          LYK_RELOAD,        0,
@@ -583,6 +583,7 @@
 { "CLEAR_AUTH",                "clear all authorization info for this session" 
},
 { "SWITCH_DTD",                "switch between two ways of parsing HTML" },
 { "ELGOTO",            "edit the current link's URL or ACTION and go to it" },
+{ "NEW_BROWSER",       "open a new browser in a new VT" },
 #ifdef USE_EXTERNALS
 { "EXTERN",            "run external program with url" },
 #endif
Index: lynx/src/LYKeymap.h
diff -u lynx/src/LYKeymap.h:1.1.1.1 lynx/src/LYKeymap.h:1.2
--- lynx/src/LYKeymap.h:1.1.1.1 Sun Mar 28 23:03:22 1999
+++ lynx/src/LYKeymap.h Sun Mar 28 23:05:45 1999
@@ -96,15 +96,16 @@
 #define       LYK_CLEAR_AUTH    71
 #define       LYK_SWITCH_DTD    72
 #define       LYK_ELGOTO        73
+#define       LYK_NEW_BROWSER   74
 
 #ifdef USE_EXTERNALS
-#define       LYK_EXTERN        74
+#define       LYK_EXTERN        75
 #if defined(VMS) || defined(DIRED_SUPPORT)
-#define       LYK_DIRED_MENU    75
+#define       LYK_DIRED_MENU    76
 #endif /* VMS || DIRED_SUPPORT */
 #else  /* USE_EXTERNALS */
 #if defined(VMS) || defined(DIRED_SUPPORT)
-#define       LYK_DIRED_MENU    74
+#define       LYK_DIRED_MENU    75
 #endif /* VMS || DIRED_SUPPORT */
 #endif /* !defined(USE_EXTERNALS) */
 
Index: lynx/src/LYMainLoop.c
diff -u lynx/src/LYMainLoop.c:1.1.1.1 lynx/src/LYMainLoop.c:1.2
--- lynx/src/LYMainLoop.c:1.1.1.1       Sun Mar 28 23:03:23 1999
+++ lynx/src/LYMainLoop.c       Sun Mar 28 23:05:45 1999
@@ -2292,6 +2292,13 @@
            }
            break;
 
+       case LYK_NEW_BROWSER:
+           if (LYOpenNewBrowser() == 0)        /* we are the parent, or failed 
*/
+               break;
+
+           /* otherwise... */
+           /* FALL THROUGH */
+
        case LYK_REFRESH:
           refresh_screen = TRUE;
           lynx_force_repaint();
Index: lynx/src/LYUtils.c
diff -u lynx/src/LYUtils.c:1.1.1.1 lynx/src/LYUtils.c:1.2
--- lynx/src/LYUtils.c:1.1.1.1  Sun Mar 28 23:03:26 1999
+++ lynx/src/LYUtils.c  Sun Mar 28 23:05:46 1999
@@ -1952,6 +1952,41 @@
        return;
 }
 
+#ifdef LINUX
+#include <linux/vt.h>
+#endif
+
+PUBLIC int LYOpenNewBrowser NOARGS
+{
+#ifdef LINUX
+       int f, arg;
+       char buf[128];
+
+       if (fork())
+               return 0;
+
+       if ((f = open("/dev/console", O_RDONLY)) < 0) exit(1);
+       if (ioctl(f, VT_OPENQRY, &arg) < 0) exit(1);
+       sprintf(buf, "/dev/tty%d", arg);
+       if (ioctl(f, VT_ACTIVATE, arg) < 0)
+         /* do nothing */ ;
+       close(f);
+
+       fflush(NULL);
+       freopen(buf, "r", stdin);
+       freopen(buf, "w", stdout);
+       freopen(buf, "w", stderr);
+       start_curses();
+
+       size_change(0);         /* I need this to support multi-head with a mono
+                                  monitor at different text resolution. */
+
+       return 1;
+#else
+       return 0;
+#endif
+}
+
 PUBLIC void noviceline ARGS1(
        int,            more_flag GCC_UNUSED)
 {
@@ -2126,6 +2161,12 @@
      */
     if (TOUPPER(c) == 'Z' || c == 7 || c == 3)
        return((int)TRUE);
+    else if (keymap[c+1] == LYK_NEW_BROWSER) {
+      if (LYOpenNewBrowser()) {
+       lynx_force_repaint();
+       return ((int)TRUE);
+      }
+    }
 #ifdef DISP_PARTIAL
     else if (display_partial && (NumOfLines_partial > 2))
     /* OK, we got several lines from new document and want to scroll... */
Index: lynx/src/LYUtils.h
diff -u lynx/src/LYUtils.h:1.1.1.1 lynx/src/LYUtils.h:1.2
--- lynx/src/LYUtils.h:1.1.1.1  Sun Mar 28 23:03:22 1999
+++ lynx/src/LYUtils.h  Sun Mar 28 23:05:47 1999
@@ -104,6 +104,7 @@
 extern void size_change PARAMS((int sig));
 extern void statusline PARAMS((CONST char *text));
 extern void toggle_novice_line NOPARAMS;
+extern int LYOpenNewBrowser NOPARAMS;
 
 #ifdef VMS
 extern void Define_VMSLogical PARAMS((char *LogicalName, char *LogicalValue));