Here's my XRandR and multi-screen patch, its pretty much not what you've
asked for here, but I'll throw it out as a starting point.  I haven't
had a chance to test it much, so don't yell at me if your screen
explodes...

one tag for all screens.  status bar is only shown on screen 0 (although
this can very easily be set to another screen)

layouts updated for multi-head:
  tile: windows are evenly divided among screens.
  monocle: one window per screen, all remaining windows on last screen.

Jeremy


On Thu 11 Dec 2008 - 10:18AM, Mate Nagy wrote:
> Hiho,
> On Thu, Dec 11, 2008 at 09:39:19AM +0100, yy wrote:
> > on this list and, if somebody finds a great _general_ solution (which
> > seems difficult, but I would be love to be wrong), I'm sure Anselm
> > would be glad to include it in the official release.
> > Just my 2cts,
>  I don't see anything "difficult" about this. In fact, awesome generally
> gets this right. This is what I want from dwm:
> 
>  - handle each xrandr screen separately
>       including all data structures, so different layout, client set,
>       tagging, etc.
>  - draw statusbar everywhere (from the same input text)
>  - have a key-bindable function for:
>       - changing between screens
>       - move window to another screen
>  - do something semi-intelligent when a screen with clients goes away,
>     e.g. put clients in previous/next screen oslt.
> 
>  Basically, it should behave as multiple separate dwms, except that
> clients can be sent from screen to screen and all dwms have the same
> configuration.
> 
>  Speculation: in this configuration, especially when changing between
> screens, moving the mouse pointer to the location of the focus might be
> more important/desirable. This might be a compile-time option or patch..
> 
> Mate
> 
diff -r 79bf47074a49 config.mk
--- a/config.mk Sat Dec 06 16:20:14 2008 +0000
+++ b/config.mk Thu Dec 11 22:50:24 2008 -0500
@@ -13,6 +13,8 @@
 # Xinerama, un-comment if you want it
 #XINERAMALIBS = -L${X11LIB} -lXinerama
 #XINERAMAFLAGS = -DXINERAMA
+XINERAMALIBS = -L${X11LIB} -lXrandr
+XINERAMAFLAGS = -DXRANDR
 
 # includes and libs
 INCS = -I. -I/usr/include -I${X11INC}
diff -r 79bf47074a49 dwm.c
--- a/dwm.c     Sat Dec 06 16:20:14 2008 +0000
+++ b/dwm.c     Thu Dec 11 22:50:24 2008 -0500
@@ -42,6 +42,9 @@
 #ifdef XINERAMA
 #include <X11/extensions/Xinerama.h>
 #endif
+#ifdef XRANDR
+#include <X11/extensions/Xrandr.h>
+#endif
 
 /* macros */
 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
@@ -52,6 +55,7 @@
 #define MAX(a, b)               ((a) > (b) ? (a) : (b))
 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
 #define MAXTAGLEN               16
+#define MAXMONITORS             8
 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
 #define WIDTH(x)                ((x)->w + 2 * (x)->bw)
 #define HEIGHT(x)               ((x)->h + 2 * (x)->bw)
@@ -206,10 +210,11 @@
 
 /* variables */
 static char stext[256];
-static int screen;
+static int screen, mons;
 static int sx, sy, sw, sh; /* X display screen geometry x, y, width, height */ 
 static int by, bh, blw;    /* bar geometry y, height and layout symbol width */
 static int wx, wy, ww, wh; /* window area geometry x, y, width, height, bar 
excluded */
+static int mx[MAXMONITORS], my[MAXMONITORS], mw[MAXMONITORS], mh[MAXMONITORS]; 
/* monitor area geometry x, y, width, height, bar excluded */
 static unsigned int seltags = 0, sellt = 0;
 static int (*xerrorxlib)(Display *, XErrorEvent *);
 static unsigned int numlockmask = 0;
@@ -926,10 +931,14 @@
 
 void
 monocle(void) {
-       Client *c;
+       int m, i;
+       Client *c = nexttiled(clients);
 
-       for(c = nexttiled(clients); c; c = nexttiled(c->next))
-               resize(c, wx, wy, ww - 2 * c->bw, wh - 2 * c->bw, resizehints);
+       for(m=0; m<mons; m++) {
+               wx=mx[m]; wy=my[m]; ww=mw[m]; wh=mh[m];
+               for(i=((m==(mons-1))?-1:1); c && i!=0; c = nexttiled(c->next), 
i--)
+                       resize(c, wx, wy, ww - 2 * c->bw, wh - 2 * c->bw, 
resizehints);
+       }
 }
 
 void
@@ -1427,35 +1436,39 @@
 
 void
 tile(void) {
-       int x, y, h, w, mw;
-       unsigned int i, n;
+       int x, y, h, w, maw;
+       unsigned int i, n, r, g, m;
        Client *c;
 
        for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next), n++);
        if(n == 0)
                return;
 
-       /* master */
        c = nexttiled(clients);
-       mw = mfact * ww;
-       resize(c, wx, wy, (n == 1 ? ww : mw) - 2 * c->bw, wh - 2 * c->bw, 
resizehints);
+       for(m=0, g=(n+(mons/2))/mons, r=n-g, n=g; c && m<mons; m++, 
n=(r<g?r:g), r-=n) {
+               wx=mx[m]; wy=my[m]; ww=mw[m]; wh=mh[m];
+               /* master */
+               maw = mfact * ww;
+               resize(c, wx, wy, (n == 1 ? ww : maw) - 2 * c->bw, wh - 2 * 
c->bw, resizehints);
+               c = nexttiled(c->next);
 
-       if(--n == 0)
-               return;
+               if( --n == 0 )
+                       continue;
 
-       /* tile stack */
-       x = (wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : wx + mw;
-       y = wy;
-       w = (wx + mw > c->x + c->w) ? wx + ww - x : ww - mw;
-       h = wh / n;
-       if(h < bh)
-               h = wh;
+               /* tile stack */
+               x = (wx + maw > c->x + c->w) ? c->x + c->w + 2 * c->bw : wx + 
maw;
+               y = wy;
+               w = (wx + maw > c->x + c->w) ? wx + ww - x : ww - maw;
+               h = wh / n;
+               if(h < bh)
+                       h = wh;
 
-       for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
-               resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
-                      ? wy + wh - y - 2 * c->bw : h - 2 * c->bw), resizehints);
-               if(h != wh)
-                       y = c->y + HEIGHT(c);
+               for(i = 0; c && (m==(mons-1)?1:n); c = nexttiled(c->next), i++, 
n--) {
+                       resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 
== g)
+                                               ? wy + wh - y - 2 * c->bw : h - 
2 * c->bw), resizehints);
+                       if(h != wh)
+                               y = c->y + HEIGHT(c);
+               }
        }
 }
 
@@ -1565,11 +1578,45 @@
        }
        else
 #endif
+#ifdef XRANDR
+       if( True /* xrr is active? */ ) {
+               int i=0, j=0, k=0, o=0;
+               XRRScreenResources *screenInfo = XRRGetScreenResources( dpy, 
root );
+               XRRCrtcInfo *crtcInfo = NULL;
+               XID seenOutputs[MAXMONITORS*16]; // 16 clones should be enough
+               for(i=0, mons=0; i<screenInfo->ncrtc; i++) {
+                       crtcInfo = XRRGetCrtcInfo( dpy, screenInfo, 
screenInfo->crtcs[i] );
+
+                       if( crtcInfo->noutput!=0 ) {
+                               Bool dupe=False;
+                               for(j=0; j<crtcInfo->noutput; j++) {
+                                       for(k=0; 
seenOutputs[k]!=crtcInfo->outputs[j] && k<o; k++);
+                                       if( k!=o )
+                                               dupe=True;
+                                       else
+                                               
seenOutputs[o++]=crtcInfo->outputs[j];
+                               }
+
+                               if( !dupe ) {
+                                       my[mons]=crtcInfo->y + (mons==0 && 
showbar && topbar ? bh : 0);
+                                       mh[mons]=crtcInfo->height - (mons==0 && 
showbar?bh:0);
+                                       mw[mons]=crtcInfo->width;
+                                       mx[mons++]=crtcInfo->x;
+                               }
+                       }
+               }
+               XRRFreeCrtcInfo(crtcInfo);
+               XRRFreeScreenResources(screenInfo);
+
+               wx = mx[0]; wy = my[0]; ww = mw[0]; wh = mh[0];
+       } else
+#endif
        {
-               wx = sx;
-               wy = showbar && topbar ? sy + bh : sy;
-               ww = sw;
-               wh = showbar ? sh - bh : sh;
+               mons=1;
+               mx[0] = wx = sx;
+               my[0] = wy = showbar && topbar ? sy + bh : sy;
+               mw[0] = ww = sw;
+               mh[0] = wh = showbar ? sh - bh : sh;
        }
 
        /* bar position */

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