Original idea from Dimitris Papastamos to move windows to corners a while ago;

re-proposed by Julien Steinhauser with an updated diff. Apparently this was in
the original calmnwm.

However, expand the original idea and let clients 'snap' to edges instead,
neatly allowing key bindings that snap to adjacent edges (i.e. corners) as
well. No default bindings assigned.

4 files changed, 76 insertions, 5 deletions

diff --git a/calmwm.h b/calmwm.h
index 21fa3ae..5ee66f2 100644
--- a/calmwm.h
+++ b/calmwm.h
@@ -15,7 +15,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
- * $OpenBSD: calmwm.h,v 1.343 2017/12/07 16:03:10 okan Exp $
+ * $OpenBSD: calmwm.h,v 1.344 2017/12/07 16:25:33 okan Exp $
  */
 
 #ifndef _CALMWM_H_
@@ -465,6 +465,7 @@ void			 screen_assert_clients_within(struct screen_ctx *);
 
 void			 kbfunc_cwm_status(void *, struct cargs *);
 void			 kbfunc_ptrmove(void *, struct cargs *);
+void			 kbfunc_client_snap(void *, struct cargs *);
 void			 kbfunc_client_move(void *, struct cargs *);
 void			 kbfunc_client_resize(void *, struct cargs *);
 void			 kbfunc_client_delete(void *, struct cargs *);
diff --git a/conf.c b/conf.c
index 1405f20..d0b4503 100644
--- a/conf.c
+++ b/conf.c
@@ -15,7 +15,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
- * $OpenBSD: conf.c,v 1.234 2017/12/07 15:47:14 okan Exp $
+ * $OpenBSD: conf.c,v 1.235 2017/12/07 16:25:33 okan Exp $
  */
 
 #include <sys/types.h>
@@ -92,6 +92,24 @@ static const struct {
 	{ "window-movetogroup-8", kbfunc_client_movetogroup, CWM_CONTEXT_CC, 8 },
 	{ "window-movetogroup-9", kbfunc_client_movetogroup, CWM_CONTEXT_CC, 9 },
 
+	{ "window-snap-up", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_UP) },
+	{ "window-snap-down", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_DOWN) },
+	{ "window-snap-left", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_LEFT) },
+	{ "window-snap-right", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_RIGHT) },
+
+	{ "window-snap-up-right", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_UP|CWM_RIGHT) },
+	{ "window-snap-up-left", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_UP|CWM_LEFT) },
+	{ "window-snap-down-right", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_DOWN|CWM_RIGHT) },
+	{ "window-snap-down-left", kbfunc_client_snap, CWM_CONTEXT_CC,
+	    (CWM_DOWN|CWM_LEFT) },
+
 	{ "window-move", kbfunc_client_move, CWM_CONTEXT_CC, 0 },
 	{ "window-move-up", kbfunc_client_move, CWM_CONTEXT_CC,
 	    (CWM_UP) },
diff --git a/cwmrc.5 b/cwmrc.5
index c044702..4e6c890 100644
--- a/cwmrc.5
+++ b/cwmrc.5
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: cwmrc.5,v 1.68 2017/07/06 17:09:17 okan Exp $
+.\"	$OpenBSD: cwmrc.5,v 1.69 2017/12/07 16:25:33 okan Exp $
 .\"
 .\" Copyright (c) 2004,2005 Marius Aamodt Eriksen <marius@monkey.org>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: July 6 2017 $
+.Dd $Mdocdate: December 7 2017 $
 .Dt CWMRC 5
 .Os
 .Sh NAME
@@ -398,6 +398,22 @@ pixels right.
 Resize window 10 times
 .Ar moveamount
 pixels left.
+.It window-snap-up
+Snap window to top edge.
+.It window-snap-down
+Snap window to bottom edge.
+.It window-snap-right
+Snap window to right edge.
+.It window-snap-left
+Snap window to left edge.
+.It window-snap-up-right
+Snap window to top-right corner.
+.It window-snap-up-left
+Snap window to top-left corner.
+.It window-snap-down-right
+Snap window to bottom-right corner.
+.It window-snap-down-left
+Snap window to bottom-left corner.
 .It pointer-move-up
 Move pointer
 .Ar moveamount
diff --git a/kbfunc.c b/kbfunc.c
index 3959046..54d2216 100644
--- a/kbfunc.c
+++ b/kbfunc.c
@@ -15,7 +15,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
- * $OpenBSD: kbfunc.c,v 1.152 2017/12/07 16:03:10 okan Exp $
+ * $OpenBSD: kbfunc.c,v 1.153 2017/12/07 16:25:33 okan Exp $
  */
 
 #include <sys/types.h>
@@ -287,6 +287,42 @@ kbfunc_client_resize_mb(void *ctx, struct cargs *cargs)
 }
 
 void
+kbfunc_client_snap(void *ctx, struct cargs *cargs)
+{
+	struct client_ctx	*cc = ctx;
+	struct screen_ctx	*sc = cc->sc;
+	struct geom		 area;
+	int			 flags;
+
+	area = screen_area(sc,
+	    cc->geom.x + cc->geom.w / 2,
+	    cc->geom.y + cc->geom.h / 2, CWM_GAP);
+
+	flags = cargs->flag;
+	while (flags) {
+		if (flags & CWM_UP) {
+			cc->geom.y = area.y;
+			flags &= ~CWM_UP;
+		}
+		if (flags & CWM_LEFT) {
+			cc->geom.x = area.x;
+			flags &= ~CWM_LEFT;
+		}
+		if (flags & CWM_RIGHT) {
+			cc->geom.x = area.x + area.w - cc->geom.w -
+			    (cc->bwidth * 2);
+			flags &= ~CWM_RIGHT;
+		}
+		if (flags & CWM_DOWN) {
+			cc->geom.y = area.y + area.h - cc->geom.h -
+			    (cc->bwidth * 2);
+			flags &= ~CWM_DOWN;
+		}
+	}
+	client_move(cc);
+}
+
+void
 kbfunc_client_delete(void *ctx, struct cargs *cargs)
 {
 	client_send_delete(ctx);