newts 0.3.0

A cross-language notebook terminal interface and server.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247

use newts::server::kernel::{PythonKernel, NodeKernel, RustKernel, CKernel, CppKernel, GoKernel, Kernel};

#[test]
fn test_python_kernel_persistence() {
    let mut kernel = PythonKernel::new(None).expect("Failed to init kernel");

    // 1. Set a variable
    let resp1 = kernel.execute("x = 42".to_string(), None, None, None).expect("Exec failed");
    assert_eq!(resp1.status, Some(0));

    // 2. Read it back
    let resp2 = kernel.execute("print(x)".to_string(), None, None, None).expect("Exec failed");
    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "42");
}

#[test]
fn test_node_kernel_persistence() {
    let mut kernel = NodeKernel::new().expect("Failed to init kernel");
    
    // 1. Set variable
    let resp1 = kernel.execute("var x = 42;".to_string(), None, None, None).expect("Exec failed");
    assert_eq!(resp1.status, Some(0));
    
    // 2. Read variable
    let resp2 = kernel.execute("console.log(x);".to_string(), None, None, None).expect("Exec failed");
    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "42");
}

#[test]
fn test_rust_kernel_persistence() {
    let mut kernel = RustKernel::new();
    
    // 1. Define struct
    let code1 = "struct Foo { x: i32 }".to_string();
    let resp1 = kernel.execute(code1.clone(), None, None, None).expect("Exec failed");
    assert_eq!(resp1.status, Some(0));
    
    // 2. Use struct
    let code2 = "let f = Foo { x: 42 }; println!(\"{}\", f.x);".to_string();
    let resp2 = kernel.execute(code2, None, Some(vec![code1]), None).expect("Exec failed");
    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "42");
}

#[test]
fn test_python_kernel_isolation() {
    let mut kernel = PythonKernel::new(None).expect("Failed to init kernel");

    // 1. Set variable
    let resp1 = kernel.execute("x = 100".to_string(), None, None, None).expect("Exec failed");
    assert_eq!(resp1.status, Some(0));

    // 2. Restart kernel (simulate isolation by creating new one)
    let mut kernel2 = PythonKernel::new(None).expect("Failed to init kernel");
    
    // 3. Check variable (should fail)
    let resp2 = kernel2.execute("print(x)".to_string(), None, None, None).expect("Exec failed");
    assert_ne!(resp2.status, Some(0));
}

#[test]
fn test_c_kernel_persistence() {
    let mut kernel = CKernel::new();
    
    // 1. Define global variable
    let code1 = "int x = 42;".to_string();
    let resp1 = kernel.execute(code1.clone(), None, None, None).expect("Exec failed");
    assert_eq!(resp1.status, Some(0));
    
    // 2. Use variable
    let code2 = "printf(\"%d\", x);".to_string();
    let resp2 = kernel.execute(code2, None, Some(vec![code1]), None).expect("Exec failed");
    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "42");
}

#[test]
fn test_cpp_kernel_persistence() {
    let mut kernel = CppKernel::new();
    
    // 1. Define class
    let code1 = "class Foo { public: int x; };".to_string();
    let resp1 = kernel.execute(code1.clone(), None, None, None).expect("Exec failed");
    if resp1.status != Some(0) {
        println!("Cpp Exec 1 failed: {}", resp1.stderr);
    }
    assert_eq!(resp1.status, Some(0));
    
    // 2. Use class
    let code2 = "Foo f; f.x = 42; std::cout << f.x;".to_string();
    let resp2 = kernel.execute(code2, None, Some(vec![code1]), None).expect("Exec failed");
    if resp2.status != Some(0) {
        println!("Cpp Exec 2 failed: {}", resp2.stderr);
    }
    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "42");
}

#[test]
fn test_go_kernel_persistence() {
    let mut kernel = GoKernel::new();
    
    // 1. Define struct
    let code1 = "type Foo struct { X int }".to_string();
    let resp1 = kernel.execute(code1.clone(), None, None, None).expect("Exec failed");
    if resp1.status != Some(0) {
        println!("Go Exec 1 failed: {}", resp1.stderr);
    }
    assert_eq!(resp1.status, Some(0));
    
    // 2. Use struct
    let code2 = "f := Foo{X: 42}; fmt.Println(f.X)".to_string();
    let resp2 = kernel.execute(code2, None, Some(vec![code1]), None).expect("Exec failed");
    if resp2.status != Some(0) {
        println!("Go Exec 2 failed: {}", resp2.stderr);
    }
    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "42");
}

#[test]
fn test_typescript_kernel_persistence() {
    let mut kernel = NodeKernel::new().expect("Failed to init kernel");
    
    // 1. Set variable with type annotation
    let code1 = "let x: number = 42;".to_string();
    let resp1 = kernel.execute(code1, Some("typescript".to_string()), None, None).expect("Exec failed");
    
    // If typescript is missing, it returns error.
    if resp1.status != Some(0) {
        println!("TS Exec 1 failed (likely missing typescript): {}", resp1.stderr);
        // We can't assert success if env is missing deps, but we can assert it handled it.
        return;
    }
    assert_eq!(resp1.status, Some(0));
    
    // 2. Read variable
    let code2 = "console.log(x);".to_string();
    let resp2 = kernel.execute(code2, Some("typescript".to_string()), None, None).expect("Exec failed");
    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "42");
}

#[test]
fn test_python_performance_persistence() {
    let mut kernel = PythonKernel::new(None).expect("Failed to init kernel");

    // 1. Real Work: Create a large list (5 million items)
    // This forces actual CPU usage and Memory allocation (~40MB+ in Python)
    let start = std::time::Instant::now();
    let code1 = "x = [i for i in range(5000000)]".to_string();
    let resp1 = kernel.execute(code1, None, None, None).expect("Exec failed");
    let duration1 = start.elapsed();
    
    assert_eq!(resp1.status, Some(0));
    println!("Python Cell 1 (Allocation) duration: {:?}", duration1);

    // 2. Access variable (should be instant)
    // If we were re-running history, this would take as long as Cell 1.
    let start2 = std::time::Instant::now();
    let code2 = "print(len(x))".to_string();
    let resp2 = kernel.execute(code2, None, None, None).expect("Exec failed");
    let duration2 = start2.elapsed();

    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "5000000");
    
    println!("Python Cell 2 (Access) duration: {:?}", duration2);
    
    // Access should be instant (< 100ms), whereas allocation takes time.
    assert!(duration2.as_millis() < 100, "Accessing existing memory should be instant");
}

#[test]
fn test_node_performance_persistence() {
    let mut kernel = NodeKernel::new().expect("Failed to init kernel");

    // 1. Real Work: Create large array (5 million items)
    let code1 = r#"
    var x = new Array(5000000).fill(0).map((_, i) => i);
    "#.to_string();
    
    let start = std::time::Instant::now();
    let resp1 = kernel.execute(code1, None, None, None).expect("Exec failed");
    let duration1 = start.elapsed();
    
    assert_eq!(resp1.status, Some(0));
    println!("Node Cell 1 (Allocation) duration: {:?}", duration1);

    // 2. Access variable
    let start2 = std::time::Instant::now();
    let code2 = "console.log(x.length);".to_string();
    let resp2 = kernel.execute(code2, None, None, None).expect("Exec failed");
    let duration2 = start2.elapsed();

    assert_eq!(resp2.status, Some(0));
    assert_eq!(resp2.stdout.trim(), "5000000");
    
    println!("Node Cell 2 (Access) duration: {:?}", duration2);
    assert!(duration2.as_millis() < 100, "Accessing existing memory should be instant");
}

#[test]
fn test_python_input_override() {
    let mut kernel = PythonKernel::new(None).expect("Failed to init kernel");

    // Check if input is overridden
    let code = "import builtins; print(builtins.input.__name__)".to_string();
    let resp = kernel.execute(code, None, None, None).expect("Exec failed");

    assert_eq!(resp.status, Some(0));
    assert_eq!(resp.stdout.trim(), "_newt_input");
}

#[test]
fn test_rust_kernel_no_output_accumulation() {
    let mut kernel = RustKernel::new();

    // 1. First cell with print statement
    let code1 = r#"
let s = String::from("hello");
let r1 = &s;
let r2 = &s;
println!("{} and {}", r1, r2);
"#.to_string();

    let resp1 = kernel.execute(code1.clone(), None, None, None).expect("Exec failed");
    assert_eq!(resp1.status, Some(0));
    assert_eq!(resp1.stdout.trim(), "hello and hello");

    // 2. Second cell with different print statement
    // Should only output "hello, world", NOT "hello and hello" + "hello, world"
    let code2 = r#"
let mut s = String::from("hello");
let r1 = &mut s;
r1.push_str(", world");
println!("{}", r1);
"#.to_string();

    let resp2 = kernel.execute(code2, None, Some(vec![code1]), None).expect("Exec failed");
    assert_eq!(resp2.status, Some(0));
    // The bug would cause this to be "hello and hello\nhello, world"
    // After the fix, it should only be "hello, world"
    assert_eq!(resp2.stdout.trim(), "hello, world");
}