From 0fc9d47fb407a65fd08e3095fface42eb93ac914 Mon Sep 17 00:00:00 2001
From: okan <okan>
Date: Thu, 7 Dec 2017 16:25:33 +0000
Subject: [PATCH] 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.
---
 calmwm.h |  1 +
 conf.c   | 18 ++++++++++++++++++
 cwmrc.5  | 16 ++++++++++++++++
 kbfunc.c | 36 ++++++++++++++++++++++++++++++++++++
 4 files changed, 71 insertions(+)

diff --git a/calmwm.h b/calmwm.h
index 85084b0..9c1ce73 100644
--- a/calmwm.h
+++ b/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 02ae7c8..5b392ef 100644
--- a/conf.c
+++ b/conf.c
@@ -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 a29fd12..6851faa 100644
--- a/cwmrc.5
+++ b/cwmrc.5
@@ -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 086e753..ad7145b 100644
--- a/kbfunc.c
+++ b/kbfunc.c
@@ -286,6 +286,42 @@ kbfunc_client_resize_mb(void *ctx, struct cargs *cargs)
 	client_ptr_inbound(cc, 0);
 }
 
+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)
 {