3 files changed, 62 insertions, 41 deletions

diff --git a/client.c b/client.c
index 28ccc4e..e0286eb 100644
--- a/client.c
+++ b/client.c
@@ -179,6 +179,11 @@ static void clientMove(int8_t dx, int8_t dy) {
 	clientMessage(msg);
 }
 
+static void clientFlip(void) {
+	struct ClientMessage msg = { .type = CLIENT_FLIP };
+	clientMessage(msg);
+}
+
 static void clientPut(uint8_t color, uint8_t cell) {
 	struct ClientMessage msg = {
 		.type = CLIENT_PUT,
@@ -277,6 +282,7 @@ static void inputNormal(wchar_t ch) {
 		break; case ESC: input.mode = MODE_NORMAL; input.shift = 0;
 		break; case 'q': endwin(); exit(EX_OK);
 
+		break; case 'g': clientFlip();
 		break; case 'h': clientMove(-1,  0);
 		break; case 'l': clientMove( 1,  0);
 		break; case 'k': clientMove( 0, -1);
diff --git a/server.c b/server.c
index 9486fcd..73cd9f1 100644
--- a/server.c
+++ b/server.c
@@ -172,6 +172,51 @@ static bool clientCursors(const struct Client *client) {
 	return true;
 }
 
+static bool clientUpdate(struct Client *client, const struct Client *old) {
+	struct ServerMessage msg = {
+		.type = SERVER_MOVE,
+		.move = { .cellX = client->cellX, .cellY = client->cellY },
+	};
+	if (!clientSend(client, msg)) return false;
+
+	if (client->tileX != old->tileX || client->tileY != old->tileY) {
+		msg.type = SERVER_TILE;
+		if (!clientSend(client, msg)) return false;
+
+		if (!clientCursors(client)) return false;
+
+		msg = (struct ServerMessage) {
+			.type = SERVER_CURSOR,
+			.cursor = {
+				.oldCellX = old->cellX,  .oldCellY = old->cellY,
+				.newCellX = CURSOR_NONE, .newCellY = CURSOR_NONE,
+			},
+		};
+		clientCast(old, msg);
+
+		msg = (struct ServerMessage) {
+			.type = SERVER_CURSOR,
+			.cursor = {
+				.oldCellX = CURSOR_NONE,   .oldCellY = CURSOR_NONE,
+				.newCellX = client->cellX, .newCellY = client->cellY,
+			},
+		};
+		clientCast(client, msg);
+
+	} else {
+		msg = (struct ServerMessage) {
+			.type = SERVER_CURSOR,
+			.cursor = {
+				.oldCellX = old->cellX,    .oldCellY = old->cellY,
+				.newCellX = client->cellX, .newCellY = client->cellY,
+			},
+		};
+		clientCast(client, msg);
+	}
+
+	return true;
+}
+
 static bool clientMove(struct Client *client, int8_t dx, int8_t dy) {
 	struct Client old = *client;
 
@@ -210,48 +255,14 @@ static bool clientMove(struct Client *client, int8_t dx, int8_t dy) {
 	assert(client->tileX < TILE_COLS);
 	assert(client->tileY < TILE_ROWS);
 
-	struct ServerMessage msg = {
-		.type = SERVER_MOVE,
-		.move = { .cellX = client->cellX, .cellY = client->cellY },
-	};
-	if (!clientSend(client, msg)) return false;
-
-	if (client->tileX != old.tileX || client->tileY != old.tileY) {
-		msg.type = SERVER_TILE;
-		if (!clientSend(client, msg)) return false;
-
-		if (!clientCursors(client)) return false;
-
-		msg = (struct ServerMessage) {
-			.type = SERVER_CURSOR,
-			.cursor = {
-				.oldCellX = old.cellX,  .oldCellY = old.cellY,
-				.newCellX = CURSOR_NONE, .newCellY = CURSOR_NONE,
-			},
-		};
-		clientCast(&old, msg);
-
-		msg = (struct ServerMessage) {
-			.type = SERVER_CURSOR,
-			.cursor = {
-				.oldCellX = CURSOR_NONE,   .oldCellY = CURSOR_NONE,
-				.newCellX = client->cellX, .newCellY = client->cellY,
-			},
-		};
-		clientCast(client, msg);
-
-	} else {
-		msg = (struct ServerMessage) {
-			.type = SERVER_CURSOR,
-			.cursor = {
-				.oldCellX = old.cellX,    .oldCellY = old.cellY,
-				.newCellX = client->cellX, .newCellY = client->cellY,
-			},
-		};
-		clientCast(client, msg);
-	}
+	return clientUpdate(client, &old);
+}
 
-	return true;
+static bool clientFlip(struct Client *client) {
+	struct Client old = *client;
+	client->tileX = (client->tileX + TILE_COLS / 2) % TILE_COLS;
+	client->tileY = (client->tileY + TILE_ROWS / 2) % TILE_ROWS;
+	return clientUpdate(client, &old);
 }
 
 static bool clientPut(const struct Client *client, uint8_t color, uint8_t cell) {
@@ -371,6 +382,9 @@ int main() {
 			break; case CLIENT_MOVE: {
 				success = clientMove(client, msg.move.dx, msg.move.dy);
 			}
+			break; case CLIENT_FLIP: {
+				success = clientFlip(client);
+			}
 			break; case CLIENT_PUT: {
 				success = clientPut(client, msg.put.color, msg.put.cell);
 			}
diff --git a/torus.h b/torus.h
index 53e469c..818f009 100644
--- a/torus.h
+++ b/torus.h
@@ -140,6 +140,7 @@ static const uint8_t CURSOR_NONE = UINT8_MAX;
 struct ClientMessage {
 	enum {
 		CLIENT_MOVE,
+		CLIENT_FLIP,
 		CLIENT_PUT,
 		CLIENT_MAP,
 	} type;