Feature: middle click in editor to pick a tile

Updated the README in consequence.

README

@@ -3,7 +3,8 @@ SLE
 A simple project oriented single screen tilebased level editor.
 
 SLE read and write KBLE level files.
-=> https://git.sr.ht/~kikoodx/kble
+KBLE format specifications:
+=> https://git.sr.ht/~kikoodx/kble/tree/dev/item/kbleformat.md
 
 COMPILATION
 ===========
@@ -34,6 +35,7 @@ Main window - Editing Area
 --------------------------
 Left click: draw with selected tile
 Right click: erase (tile 0)
+Middle click: pick a tile
 
 Secondary window - Tile Picker
 ------------------------------
@@ -50,8 +52,8 @@ FLAGS
 Mandatory flags
 ---------------
 All these options take a path to a file as argument.
--tileset Tileset image
--level   KBLE file
+-tileset : tileset image
+-level : KBLE file
 
 Optional flags
 --------------

src/editing_area/draw.c

@@ -18,10 +18,13 @@ void level_draw(struct Level level, struct Options options,
 			/* if tile index is out of bound, skip */
 			if (tile_index >= level.width * level.height)
 				continue;
-			const Tile tile = level.data[tile_index] - options.tile_first;
+			const Tile tile =
+			    level.data[tile_index] - options.tile_first;
 			/* if tile is not in tileset, skip */
-			if (tile < 0 || (!tile && !options.tile_first) || tile >= options.tileset_width *
-			                         options.tileset_height)
+			if (tile < 0 ||
+			    (!tile && !options.tile_first) ||
+			    tile >= options.tileset_width *
+			                options.tileset_height)
 				continue;
 
 			const Rectangle tile_rect = {

src/editing_area/main.c

@@ -108,17 +108,17 @@ static void update_mouse(int *mouse_x, int *mouse_y, struct Level level,
 	                      level.height - 1);
 
 	/* set tile */
-	if (left_click) {
+	if (left_click)
 		level.data[*mouse_x + *mouse_y * level.width] =
 		    shared_data->selected_tile;
-	}
 	/* remove tile */
-	if (right_click) {
+	if (right_click)
 		level.data[*mouse_x + *mouse_y * level.width] = 0;
-	}
-	/* get info about tile */
+	/* set tile to pointed cell (pick tile) */
 	if (middle_click) {
 		INFO_VAR("%d",
 		         level.data[*mouse_x + *mouse_y * level.width]);
+		shared_data->selected_tile =
+		    level.data[*mouse_x + *mouse_y * level.width];
 	}
 }