examples: Add example that deletes a directory

examples/delete_dir.zig

@@ -0,0 +1,42 @@
+const std = @import("std");
+const Io = std.Io;
+
+const Simulator = @import("zigmulator");
+
+fn deleteDirProgram(init: std.process.Init) anyerror!void {
+    try Io.Dir.cwd().createDir(init.io, "scratch", .default_dir);
+
+    const scratch_dir = try Io.Dir.cwd().openDir(init.io, "scratch", .{});
+    const file = try scratch_dir.createFile(init.io, "temporary.txt", .{});
+    file.close(init.io);
+
+    const non_empty_delete = Io.Dir.cwd().deleteDir(init.io, "scratch");
+    const saw_non_empty = if (non_empty_delete) |_| false else |err| switch (err) {
+        error.DirNotEmpty => true,
+        else => return err,
+    };
+
+    try scratch_dir.deleteFile(init.io, "temporary.txt");
+    scratch_dir.close(init.io);
+
+    try Io.Dir.cwd().deleteDir(init.io, "scratch");
+
+    var stdout = Io.File.stdout().writerStreaming(init.io, &.{});
+    if (saw_non_empty) {
+        try stdout.interface.writeAll("scratch was deleted after emptying it\n");
+    } else {
+        try stdout.interface.writeAll("scratch delete did not report DirNotEmpty\n");
+    }
+    try stdout.interface.flush();
+}
+
+pub fn main(init: std.process.Init) !void {
+    var sim: Simulator = undefined;
+    sim.init(std.heap.page_allocator, init.io);
+    defer sim.deinit();
+
+    try sim.addExecutable("delete_dir", deleteDirProgram);
+    try sim.spawn("delete_dir", .{});
+
+    while (sim.scheduleOne()) {}
+}