Update.

example/pexpect_demo.wren

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+// retoor <retoor@molodetz.nl>
+
+import "pexpect" for Spawn, Pexpect
+
+System.print("=== Pexpect Module Demo ===\n")
+
+System.print("--- Basic Spawn and Expect ---")
+var child = Spawn.new("echo 'Hello from pexpect!'")
+var idx = child.expect(["Hello"])
+System.print("Matched pattern index: %(idx)")
+System.print("After match: %(child.after)")
+child.close()
+
+System.print("\n--- Interactive Process ---")
+child = Spawn.new("cat")
+child.sendline("First line")
+child.expect(["First line"])
+System.print("Echo received: %(child.after)")
+child.sendline("Second line")
+child.expect(["Second line"])
+System.print("Echo received: %(child.after)")
+child.sendeof()
+child.close()
+
+System.print("\n--- Multiple Patterns ---")
+child = Spawn.new("printf 'username: '")
+idx = child.expect(["password:", "username:", "login:"])
+System.print("Matched: %(idx == 1 ? "username" : "other")")
+child.close()
+
+System.print("\n--- Exact String Matching ---")
+child = Spawn.new("echo 'The answer is 42'")
+idx = child.expectExact(["42"])
+System.print("Found exact match: %(child.after)")
+System.print("Text before: %(child.before)")
+child.close()
+
+System.print("\n--- Timeout Handling ---")
+child = Spawn.new("sleep 10")
+child.timeout = 0.5
+idx = child.expect(["never_match"])
+if (idx == Pexpect.TIMEOUT) {
+  System.print("Got timeout as expected")
+}
+child.terminate(true)
+child.close()
+
+System.print("\n--- Process Properties ---")
+child = Spawn.new("echo test")
+System.print("PID: %(child.pid)")
+System.print("Is alive: %(child.isalive)")
+child.expect(["test"])
+child.wait()
+System.print("Exit status: %(child.exitstatus)")
+child.close()
+
+System.print("\n--- Read Non-blocking ---")
+child = Spawn.new("printf 'quick output'")
+var data = child.readNonblocking(100, 1)
+System.print("Read: %(data.trim())")
+child.close()
+
+System.print("\n--- Constants ---")
+System.print("EOF constant: %(Pexpect.EOF)")
+System.print("TIMEOUT constant: %(Pexpect.TIMEOUT)")
+
+System.print("\n--- Pexpect.run() ---")
+var output = Pexpect.run("echo 'Simple run'")
+System.print("Output: %(output.trim())")
+
+System.print("\n=== Demo Complete ===")

example/yaml_demo.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+System.print("=== YAML Module Demo ===\n")
+
+System.print("--- Basic Parsing ---")
+var simple = Yaml.parse("name: Wren-CLI\nversion: 0.4.0")
+System.print("Name: %(simple["name"])")
+System.print("Version: %(simple["version"])")
+
+System.print("\n--- Nested Structures ---")
+var nested = "
+database:
+  host: localhost
+  port: 5432
+  credentials:
+    user: admin
+    password: secret
+"
+var config = Yaml.parse(nested)
+System.print("Host: %(config["database"]["host"])")
+System.print("Port: %(config["database"]["port"])")
+System.print("User: %(config["database"]["credentials"]["user"])")
+
+System.print("\n--- Lists ---")
+var listYaml = "
+languages:
+  - Wren
+  - C
+  - Python
+"
+var langs = Yaml.parse(listYaml)
+System.print("Languages:")
+for (lang in langs["languages"]) {
+  System.print("  - %(lang)")
+}
+
+System.print("\n--- Complex Structure (Navigation) ---")
+var navYaml = "
+sections:
+  - title: Getting Started
+    pages:
+      - file: index
+        title: Overview
+      - file: installation
+        title: Installation
+  - title: API Reference
+    pages:
+      - file: yaml
+        title: yaml
+"
+var nav = Yaml.parse(navYaml)
+for (section in nav["sections"]) {
+  System.print("Section: %(section["title"])")
+  for (page in section["pages"]) {
+    System.print("  - %(page["title"]) (%(page["file"]))")
+  }
+}
+
+System.print("\n--- Data Types ---")
+var types = "
+string: hello world
+number: 42
+float: 3.14159
+bool_true: true
+bool_false: false
+null_value: null
+quoted: \"with spaces\"
+"
+var data = Yaml.parse(types)
+System.print("String: %(data["string"]) (%(data["string"].type))")
+System.print("Number: %(data["number"]) (%(data["number"].type))")
+System.print("Float: %(data["float"]) (%(data["float"].type))")
+System.print("Bool true: %(data["bool_true"]) (%(data["bool_true"].type))")
+System.print("Bool false: %(data["bool_false"]) (%(data["bool_false"].type))")
+System.print("Null: %(data["null_value"])")
+System.print("Quoted: %(data["quoted"])")
+
+System.print("\n--- Stringify ---")
+var obj = {
+  "name": "Example",
+  "count": 42,
+  "active": true,
+  "items": ["one", "two", "three"],
+  "nested": {
+    "key": "value"
+  }
+}
+System.print("Serialized:")
+System.print(Yaml.stringify(obj))
+
+System.print("\n--- Round-trip ---")
+var original = "
+title: Test
+items:
+  - first
+  - second
+"
+var parsed = Yaml.parse(original)
+var reserialized = Yaml.stringify(parsed)
+var reparsed = Yaml.parse(reserialized)
+System.print("Original title: %(parsed["title"])")
+System.print("Reparsed title: %(reparsed["title"])")
+System.print("Items match: %(parsed["items"][0] == reparsed["items"][0])")