added /view/X/capacity (though some corner cases might crash the wm if you use it)

cmd/wm/area.c

@@ -116,11 +116,58 @@ void
 send2area(Area *to, Area *from, Client *c)
 {
 	c->revert = from;
-	detach_fromarea(from, c);
+	detach_fromarea(from, c, True);
 	attach_toarea(to, c);
 	focus_client(c);
 }
 
+void
+pre_attach(Area *a)
+{
+	Area *new = nil;
+	Client *c;
+	View *v = a->view;
+	unsigned int i, j;
+
+	if(!a->capacity || (a->nframe < a->capacity))
+		return;
+	i = area2index(a);
+	for(j = i + 1; j < v->narea; j++)
+		if(!v->area[j]->capacity
+				|| (v->area[j]->capacity > v->area[j]->nframe))
+		{
+			new = v->area[j];
+			break;
+		}
+	if(!new) {
+		new = alloc_area(v);
+		arrange_view(v, True);
+	}
+	c = a->frame[a->sel]->client;
+	detach_fromarea(a, c, False);
+	attach_toarea(new, c);
+	arrange_area(new);
+}
+
+void
+post_detach(Area *a)
+{
+	Client *c;
+	Area *det;
+	View *v = a->view;
+	unsigned int i = area2index(a);
+
+	if(!a->capacity || i + 1 >= v->narea)
+		return;
+	det = v->area[i + 1];
+	if(!det->nframe)
+		return;
+	c = det->frame[det->sel]->client;
+	detach_fromarea(det, c, True);
+	attach_toarea(a, c);
+	arrange_area(a);
+}
+
 void
 attach_toarea(Area *a, Client *c)
 {
@@ -129,6 +176,7 @@ attach_toarea(Area *a, Client *c)
 
 	if(clientofview(a->view, c))
 		return;
+	pre_attach(a);
 	f = cext_emallocz(sizeof(Frame));
 	f->id = id++;
 	f->area = a;
@@ -150,7 +198,7 @@ attach_toarea(Area *a, Client *c)
 }
 
 void
-detach_fromarea(Area *a, Client *c)
+detach_fromarea(Area *a, Client *c, Bool postarrange)
 {
 	Frame *f;
 	View *v = a->view;
@@ -171,6 +219,12 @@ detach_fromarea(Area *a, Client *c)
 	a->nframe--;
 	if(a->sel > 0)
 		a->sel--;
+
+	if(!postarrange)
+		return;
+
+	post_detach(a);
+
 	i = area2index(a);
 	if(i && a->nframe)
 		arrange_area(a);
@@ -180,7 +234,7 @@ detach_fromarea(Area *a, Client *c)
 				destroy_area(a);
 			else if(!a->nframe && v->area[0]->nframe)
 				v->sel = 0; /* focus floating area if it contains something */
-			arrange_tag(v, True);
+			arrange_view(v, True);
 		}
 		else if(!i && !a->nframe) {
 			if(c->trans) {
@@ -351,27 +405,6 @@ Fallthrough:
 	relax_area(a);
 }
 
-void
-arrange_tag(View *v, Bool updategeometry)
-{
-	unsigned int i;
-	unsigned int width;
-
-	if(v->narea == 1)
-		return;
-
-	width = rect.width / (v->narea - 1);
-	for(i = 1; i < v->narea; i++) {
-		Area *a = v->area[i];
-		if(updategeometry) {
-			a->rect.height = rect.height - brect.height;
-			a->rect.x = (i - 1) * width;
-			a->rect.width = width;
-		}
-		arrange_area(a);
-	}
-}
-
 static void
 match_horiz(Area *a, XRectangle *r)
 {
@@ -393,6 +426,7 @@ drop_resize(Frame *f, XRectangle *new)
 	Frame *north = nil, *south = nil;
 	unsigned int i;
 	unsigned int min = 2 * bar_height();
+	Bool horiz_resize = False;
 
 	for(i = 1; (i < v->narea) && (v->area[i] != a); i++);
 	/* first managed area is indexed 1, thus (i > 1) ? ... */
@@ -403,47 +437,36 @@ drop_resize(Frame *f, XRectangle *new)
 	north = i ? a->frame[i - 1] : nil;
 	south = i + 1 < a->nframe ? a->frame[i + 1] : nil;
 
-	/* validate (and trim if necessary) horizontal resize */
-	if(new->width < MIN_COLWIDTH) {
-		if(new->x + new->width == f->rect.x + f->rect.width)
-			new->x = a->rect.x + a->rect.width - MIN_COLWIDTH;
-		new->width = MIN_COLWIDTH;
-	}
+	/* horizontal resize */
 	if(west && (new->x != f->rect.x)) {
+		horiz_resize = True;
 		if(new->x < 0 || new->x < (west->rect.x + MIN_COLWIDTH)) {
 			new->width -= (west->rect.x + MIN_COLWIDTH) - new->x;
 			new->x = west->rect.x + MIN_COLWIDTH;
+		} else if(new->width < MIN_COLWIDTH) {
+			new->x -= MIN_COLWIDTH - new->width;
+			new->width = MIN_COLWIDTH;
 		}
-	} else {
-		new->width += new->x - a->rect.x;
-		new->x = a->rect.x;
-	}
-	if(east && (new->x + new->width != f->rect.x + f->rect.width)) {
-		if((new->x + new->width) > (east->rect.x + east->rect.width - MIN_COLWIDTH))
-			new->width = (east->rect.x + east->rect.width - MIN_COLWIDTH) - new->x;
-	} else
-		new->width = (a->rect.x + a->rect.width) - new->x;
-	if(new->width < MIN_COLWIDTH)
-		goto AfterHorizontal;
-
-	/* horizontal resize */
-	if(west && (new->x != a->rect.x)) {
 		west->rect.width = new->x - west->rect.x;
 		a->rect.width += a->rect.x - new->x;
 		a->rect.x = new->x;
-		match_horiz(a, &a->rect);
 		match_horiz(west, &west->rect);
 		relax_area(west);
 	}
-	if(east && (new->x + new->width != a->rect.x + a->rect.width)) {
+	if(east && (new->x + new->width != f->rect.x + f->rect.width)) {
+		horiz_resize = True;
+		if((new->x + new->width) > (east->rect.x + east->rect.width - MIN_COLWIDTH))
+			new->width = (east->rect.x + east->rect.width - MIN_COLWIDTH) - new->x;
+		else if(new->width < MIN_COLWIDTH)
+			new->width = MIN_COLWIDTH;
 		east->rect.width -= new->x + new->width - east->rect.x;
 		east->rect.x = new->x + new->width;
 		a->rect.width = (new->x + new->width) - a->rect.x;
-		match_horiz(a, &a->rect);
 		match_horiz(east, &east->rect);
 		relax_area(east);
 	}
-AfterHorizontal:
+	if(horiz_resize)
+		match_horiz(a, &a->rect);
 
 	if(a->mode == Colstack || a->mode == Colmax)
 		goto AfterVertical;

cmd/wm/bar.c

@@ -94,7 +94,7 @@ void
 draw_bar()
 {
 	unsigned int i = 0, w = 0;
-	int exp = 0;
+	int exp = -1;
 	Draw d = { 0 };
 	Label *l = nil;
 

cmd/wm/client.c

@@ -519,10 +519,10 @@ send2area_client(Client *c, char *arg)
 	if(i == -1)
 		return;
 	if(!strncmp(arg, "new", 4) && i) {
-		if(a->nframe == 1 || v->narea - 1 >= rect.width / MIN_COLWIDTH)
+		if(a->nframe == 1 || v->narea - 1 >= rect.width / (2 * MIN_COLWIDTH))
 			return;
 		to = alloc_area(v);
-		arrange_tag(v, True);
+		arrange_view(v, True);
 	}
 	else if(!strncmp(arg, "prev", 5) && i) {
 		if(i == 1)

cmd/wm/fs.c

@@ -55,6 +55,7 @@ static char Ebadvalue[] = "bad value";
  * /view/1/			FsDarea
  * /view/1/ctl		FsFctl			command interface (area)
  * /view/1/mode		FsFmode			column mode
+ * /view/1/capacity	FsFcapacity		capacity of column
  * /view/1/sel/		FsDclient
  * /view/1/1/class	FsFclass		class:instance of client
  * /view/1/1/name	FsFname			name of client
@@ -217,6 +218,11 @@ qid2name(Qid *qid)
 			return nil;
 		return "tags";
 		break;
+	case FsFcapacity:
+		if(i1 == -1 || i2 == -1)
+			return nil;
+		return "capacity";
+		break;
 	case FsFmode:
 		if(i1 == -1 || i2 == -1)
 			return nil;
@@ -269,6 +275,8 @@ name2type(char *name, unsigned char dir_type)
 		return FsFrules;
 	if(!strncmp(name, "data", 5))
 		return FsFdata;
+	if(!strncmp(name, "capacity", 9))
+		return FsFcapacity;
 	if(!strncmp(name, "mode", 5))
 		return FsFmode;
 	if(!strncmp(name, "tag", 4))
@@ -381,6 +389,7 @@ mkqid(Qid *dir, char *wname, Qid *new)
 			return -1;
 		goto Mkfile;
 		break;
+	case FsFcapacity:
 	case FsFmode:
 		if(dir_i1 == -1 || dir_i2 == -1 || dir_type != FsDarea)
 			return -1;
@@ -536,6 +545,10 @@ type2stat(Stat *stat, char *wname, Qid *dir)
 	case FsFdata:
 		return mkstat(stat, dir, wname, (dir_i1 == nlabel) ? 0 : strlen(label[dir_i1]->data), DMREAD | DMWRITE);
 		break;
+	case FsFcapacity:
+		snprintf(buf, sizeof(buf), "%u", view[dir_i1]->area[dir_i2]->capacity);
+		return mkstat(stat, dir, wname, strlen(buf), DMREAD | DMWRITE);
+		break;
 	case FsFmode:
 		return mkstat(stat, dir, wname, strlen(mode2str(view[dir_i1]->area[dir_i2]->mode)), DMREAD | DMWRITE);
 		break;
@@ -789,8 +802,10 @@ xread(IXPConn *c, Fcall *fcall)
 		case FsDarea:
 			/* jump to offset */
 			len = type2stat(&stat, "ctl", &m->qid);
-			if(i2)
+			if(i2) {
 				len += type2stat(&stat, "mode", &m->qid);
+				len += type2stat(&stat, "capacity", &m->qid);
+			}
 			if(view[i1]->area[i2]->nframe)
 				len += type2stat(&stat, "sel", &m->qid);
 			for(i = 0; i < view[i1]->area[i2]->nframe; i++) {
@@ -956,6 +971,8 @@ xread(IXPConn *c, Fcall *fcall)
 			if(i2) {
 				fcall->count += type2stat(&stat, "mode", &m->qid);
 				p = ixp_enc_stat(p, &stat);
+				fcall->count += type2stat(&stat, "capacity", &m->qid);
+				p = ixp_enc_stat(p, &stat);
 			}
 			if(view[i1]->area[i2]->nframe) {
 				fcall->count += type2stat(&stat, "sel", &m->qid);
@@ -1103,6 +1120,13 @@ xread(IXPConn *c, Fcall *fcall)
 			if((fcall->count = strlen(def.font)))
 				memcpy(p, def.font, fcall->count);
 			break;
+		case FsFcapacity:
+			if(!i2)
+				return Enofile;
+			snprintf(buf, sizeof(buf), "%u", view[i1]->area[i2]->capacity);
+			fcall->count = strlen(buf);
+			memcpy(p, buf, fcall->count);
+			break;
 		case FsFmode:
 			if(!i2)
 				return Enofile;
@@ -1319,6 +1343,35 @@ xwrite(IXPConn *c, Fcall *fcall)
 		xfont = blitz_getfont(dpy, def.font);
 		update_bar_geometry();
 		break;
+	case FsFcapacity:
+		if(!i2)
+			return Enofile;
+		if(fcall->count > sizeof(buf))
+			return Ebadvalue;
+		memcpy(buf, fcall->data, fcall->count);
+		buf[fcall->count] = 0;
+		i = cext_strtonum(buf, 0, 0xffff, &err);
+		if(err)
+			return Ebadvalue;
+		view[i1]->area[i2]->capacity = i;
+		if(i) {
+			Area *a = view[i1]->area[i2];
+			len = 0;
+			while(a->nframe > a->capacity)
+				pre_attach(a);
+			for(i = 1; i < view[i1]->narea; i++)
+				len += view[i1]->area[i]->nframe;
+			if(len > a->capacity) {
+				while(a->nframe < a->capacity) {
+					i = a->nframe;
+					post_detach(a);
+					if(i == a->nframe)
+						break;
+				}
+			}
+			arrange_area(a);
+		}
+		break;
 	case FsFmode:
 		if(!i2)
 			return Enofile;

cmd/wm/view.c

@@ -234,7 +234,7 @@ detach_fromview(View *v, Client *c)
 	Client *cl;
 	for(i = 0; i < v->narea; i++) {
 		if(clientofarea(v->area[i], c)) {
-			detach_fromarea(v->area[i], c);
+			detach_fromarea(v->area[i], c, True);
 			XMoveWindow(dpy, c->framewin, 2 * rect.width, 0);
 		}
 	}
@@ -297,3 +297,24 @@ restack_view(View *v)
 	if(n)
 		XRestackWindows(dpy, wins, n);
 }
+
+void
+arrange_view(View *v, Bool updategeometry)
+{
+	unsigned int i;
+	unsigned int width;
+
+	if(v->narea == 1)
+		return;
+
+	width = rect.width / (v->narea - 1);
+	for(i = 1; i < v->narea; i++) {
+		Area *a = v->area[i];
+		if(updategeometry) {
+			a->rect.height = rect.height - brect.height;
+			a->rect.x = (i - 1) * width;
+			a->rect.width = width;
+		}
+		arrange_area(a);
+	}
+}

cmd/wm/wm.h

@@ -60,13 +60,14 @@ enum {
 	FsFtags,
 	FsFclass,
 	FsFtag,
+	FsFcapacity,
 	FsFmode
 };
 
 #define MAX_TAGS			8
 #define MAX_TAGLEN			32
 #define WM_PROTOCOL_DELWIN	1
-#define MIN_COLWIDTH		64
+#define MIN_COLWIDTH		32
 
 typedef struct View View;
 typedef struct Area Area;
@@ -91,6 +92,7 @@ struct Area {
 	unsigned int framesz;
 	unsigned int sel;
 	unsigned int nframe;
+	unsigned int capacity;
 	int mode;
 	XRectangle rect;
 };
@@ -205,13 +207,14 @@ int aid2index(View *t, unsigned short id);
 void select_area(Area *a, char *arg);
 void send2area(Area *to, Area *from, Client *c);
 void attach_toarea(Area *a, Client *c);
-void detach_fromarea(Area *a, Client *c);
-void arrange_tag(View *t, Bool updategeometry);
+void detach_fromarea(Area *a, Client *c, Bool postarrange);
 void arrange_area(Area *a);
 void resize_area(Client *c, XRectangle *r, XPoint *pt);
 int str2mode(char *arg);
 char *mode2str(int mode);
 Bool clientofarea(Area *a, Client *c);
+void pre_attach(Area *a);
+void post_detach(Area *a);
 
 /* bar.c */
 Label *get_label(char *name);
@@ -286,6 +289,7 @@ Bool istag(char *t);
 void update_tags();
 
 /* view.c */
+void arrange_view(View *v, Bool updategeometry);
 View *alloc_view(char *name);
 void focus_view(View *v);
 XRectangle *rectangles(View *v, Bool isfloat, unsigned int *num);