From 08a6da05412961ddf629415a92749b02d875fa62 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Mon, 4 Oct 2021 17:25:48 -0700
Subject: feat(wm): layer shell

---
 sys/cmd/wm/util.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)

(limited to 'sys/cmd/wm/util.c')

diff --git a/sys/cmd/wm/util.c b/sys/cmd/wm/util.c
index 28b0e54..cf4f68a 100644
--- a/sys/cmd/wm/util.c
+++ b/sys/cmd/wm/util.c
@@ -1,5 +1,16 @@
 #include "wm.h"
 
+typedef struct {
+    uint32 singular_anchor;
+    uint32 anchor_triplet;
+    int *positive_axis;
+    int *negative_axis;
+    int margin;
+} Edge;
+
+// -----------------------------------------------------------------------
+// general purpose function on rectangles
+
 void
 scale_box(struct wlr_box *box, float scale)
 {
@@ -8,3 +19,80 @@ scale_box(struct wlr_box *box, float scale)
     box->x = ROUND(box->x * scale);
     box->y = ROUND(box->y * scale);
 }
+
+void
+exclude(struct wlr_box *usable_area, uint32 anchor, int32 exclusive,
+        int32 margin_top, int32 margin_right, int32 margin_bottom, int32 margin_left) 
+{
+    Edge edges[] = {
+        { // Top
+            .singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP,
+            .anchor_triplet = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP,
+            .positive_axis = &usable_area->y,
+            .negative_axis = &usable_area->height,
+            .margin = margin_top,
+        },
+        { // Bottom
+            .singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
+            .anchor_triplet = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
+            .positive_axis = NULL,
+            .negative_axis = &usable_area->height,
+            .margin = margin_bottom,
+        },
+        { // Left
+            .singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT,
+            .anchor_triplet = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
+            .positive_axis = &usable_area->x,
+            .negative_axis = &usable_area->width,
+            .margin = margin_left,
+        },
+        { // Right
+            .singular_anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT,
+            .anchor_triplet = ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
+                ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
+            .positive_axis = NULL,
+            .negative_axis = &usable_area->width,
+            .margin = margin_right,
+        }
+    };
+    for(size_t i = 0; i < arrlen(edges); i++) {
+        if((anchor == edges[i].singular_anchor || anchor == edges[i].anchor_triplet)
+                && exclusive + edges[i].margin > 0) {
+            if(edges[i].positive_axis)
+                *edges[i].positive_axis += exclusive + edges[i].margin;
+            if(edges[i].negative_axis)
+                *edges[i].negative_axis -= exclusive + edges[i].margin;
+            break;
+        }
+    }
+}
+
+// -----------------------------------------------------------------------
+// user facing functions
+
+void
+spawn(Arg *arg)
+{
+    if(!fork()) {
+        dup2(2, 1);
+        setsid();
+        execvp(((char **)arg->v)[0], (char **)arg->v);
+    }
+}
+
+void
+quit(Arg *arg)
+{
+    wl_display_terminate(server.display);
+}
+
+#define CONFIG(a,b,...) a cfg·##b = __VA_ARGS__
+#include "config.h"
+#undef CONFIG
-- 
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