1 files changed, 95 insertions, 0 deletions
diff --git a/sway/output.c b/sway/output.c
new file mode 100644
index 00000000..39c933f8
--- /dev/null
+++ b/sway/output.c
@@ -0,0 +1,95 @@
+#include <strings.h>
+#include "output.h"
+#include "log.h"
+
+swayc_t *output_by_name(const char* name) {
+	if (strcasecmp(name, "left") == 0) {
+		return swayc_adjacent_output(NULL, MOVE_LEFT);
+	}
+	else if (strcasecmp(name, "right") == 0) {
+		return swayc_adjacent_output(NULL, MOVE_RIGHT);
+	}
+	else if (strcasecmp(name, "up") == 0) {
+		return swayc_adjacent_output(NULL, MOVE_UP);
+	}
+	else if (strcasecmp(name, "down") == 0) {
+		return swayc_adjacent_output(NULL, MOVE_DOWN);
+	}
+	else {
+		for(int i = 0; i < root_container.children->length; ++i) {
+			swayc_t *c = root_container.children->items[i];
+			if (c->type == C_OUTPUT && strcasecmp(c->name, name) == 0) {
+				return c;
+			}
+		}
+	}
+	return NULL;
+}
+
+swayc_t *swayc_adjacent_output(swayc_t *output, enum movement_direction dir) {
+	// TODO: This implementation is naïve: We assume all outputs are
+	// perfectly aligned (ie. only a single output per edge which covers
+	// the whole edge).
+	if (!output) {
+		output = swayc_active_output();
+	}
+	swayc_t *adjacent = NULL;
+	switch(dir) {
+		case MOVE_LEFT:
+			for(int i = 0; i < root_container.children->length; ++i) {
+				swayc_t *c = root_container.children->items[i];
+				if (c == output || c->type != C_OUTPUT) {
+					continue;
+				}
+				if (c->y == output->y && c->x + c->width == output->x) {
+					sway_log(L_DEBUG, "%s is left of current output %s", c->name, output->name);
+					adjacent = c;
+					break;
+				}
+			}
+			break;
+		case MOVE_RIGHT:
+			for(int i = 0; i < root_container.children->length; ++i) {
+				swayc_t *c = root_container.children->items[i];
+				if (c == output || c->type != C_OUTPUT) {
+					continue;
+				}
+				if (c->y == output->y && output->x + output->width == c->x) {
+					sway_log(L_DEBUG, "%s is right of current output %s", c->name, output->name);
+					adjacent = c;
+					break;
+				}
+			}
+			break;
+		case MOVE_UP:
+			for(int i = 0; i < root_container.children->length; ++i) {
+				swayc_t *c = root_container.children->items[i];
+				if (c == output || c->type != C_OUTPUT) {
+					continue;
+				}
+				if (output->x == c->x && c->y + c->height == output->y) {
+					sway_log(L_DEBUG, "%s is above current output %s", c->name, output->name);
+					adjacent = c;
+					break;
+				}
+			}
+			break;
+		case MOVE_DOWN:
+			for(int i = 0; i < root_container.children->length; ++i) {
+				swayc_t *c = root_container.children->items[i];
+				if (c == output || c->type != C_OUTPUT) {
+					continue;
+				}
+				if (output->x == c->x && output->y + output->height == c->y) {
+					sway_log(L_DEBUG, "%s is below current output %s", c->name, output->name);
+					adjacent = c;
+					break;
+				}
+			}
+			break;
+		default:
+			sway_abort("Function called with invalid argument.");
+			break;
+	}
+	return adjacent;
+}