simulator: Implement Simulator.dumpFiles to easily inspect the in-memory file system's state

src/file_system.zig

@@ -414,3 +414,23 @@ pub fn fileSize(self: *FileSystem, open_file: *OpenFile) usize {
     _ = self;
     return open_file.entity.bytes.items.len;
 }
+
+fn dumpEntity(entity: *Entity, depth: u32) void {
+    if (entity.is_dir) {
+        for (entity.children.items) |item| {
+            for (0..depth) |_|
+                std.debug.print("  ", .{});
+            std.debug.print("{s}\n", .{ item.getName() });
+            dumpEntity(item.addr, depth+1);
+        }
+    } else {
+        for (0..depth) |_|
+            std.debug.print("  ", .{});
+        std.debug.print("[{s}]", .{ entity.bytes.items });
+    }
+}
+
+pub fn dump(self: *FileSystem) void {
+    dumpEntity(self.root, 0);
+    std.debug.print("\n", .{});
+}

src/node.zig

@@ -381,3 +381,7 @@ pub fn closeSocket(self: *Node, handle: Handle) HandleError!void {
     }
     desc.kind = .unused;
 }
+
+pub fn dumpFiles(self: *Node) void {
+    self.file_system.dump();
+}

src/simulator.zig

@@ -77,6 +77,12 @@ pub fn scheduleOne(self: *Simulator) bool {
     return self.scheduler.scheduleOne();
 }
 
+pub fn dumpFiles(self: *Simulator) void {
+    for (self.nodes.items) |node| {
+        node.dumpFiles();
+    }
+}
+
 // Reads the first word of a command
 //     "program arg1 arg2 arg3" -> "program"
 fn extractProgramNameFromCommand(command: []const u8) ?[]const u8 {