From bc9b48f31048fc1bf756666ecccbf40c95c15135 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 08 Aug 2021 17:00:23 -0400
Subject: player: Reveal map

---
diff --git a/src/player.c b/src/player.c
index 3d84b0f..d0b3f51 100644
--- a/src/player.c
+++ b/src/player.c
@@ -132,6 +132,8 @@ mf_player_update(struct mf_player *p)
 {
 	int dx;
 	int dy;
+	int x;
+	int y;
 
 	if (p->travel > 0) {
 		/* Currently moving */
@@ -149,7 +151,7 @@ mf_player_update(struct mf_player *p)
 			}
 		} else {
 			/* Farther to go */
-			return 0;
+			goto end;
 		}
 	}
 	if (p->new_dir != MF_PLAYER_DIR_N_ && p->cur_dir != p->new_dir) {
@@ -177,7 +179,7 @@ mf_player_update(struct mf_player *p)
 			p->new_dir = MF_PLAYER_DIR_N_;
 			if (mf_maze_is_wall(p->maze, p->cur_x, p->cur_y,
 						dx, dy)) {
-				return 0;
+				goto end;
 			}
 			p->new_x = p->cur_x + dx;
 			p->new_y = p->cur_y + dy;
@@ -185,6 +187,23 @@ mf_player_update(struct mf_player *p)
 		}
 	}
 
+ end:
+	switch (p->cur_dir) {
+		case MF_PLAYER_DIR_U_: dx =  0; dy = -1; break;
+		case MF_PLAYER_DIR_D_: dx =  0; dy =  1; break;
+		case MF_PLAYER_DIR_L_: dx = -1; dy =  0; break;
+		case MF_PLAYER_DIR_R_: dx =  1; dy =  0; break;
+		default:               dx =  0; dy =  0; break;
+	}
+	x = p->cur_x - dx, y = p->cur_y - dy;
+	do {
+		x += dx, y += dy;
+		mf_maze_reveal_wall(p->maze, x, y, -1,  0);
+		mf_maze_reveal_wall(p->maze, x, y,  1,  0);
+		mf_maze_reveal_wall(p->maze, x, y,  0, -1);
+		mf_maze_reveal_wall(p->maze, x, y,  0,  1);
+	} while (!mf_maze_is_wall(p->maze, x, y, dx, dy));
+
 	return 0;
 }
 
--
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