rustlings-v1.0.md · iOSDevLog/rust-based-os-comp2022

# 分析 Rustlings v1.0 的实现
---

## rustlings dependencies

```bash
# v0.2
[dependencies]
quicli = "0.2.0" # cli args
ansi_term = "0.11.0" # color
# v1.0
clap = "2.32.0" # cli args
indicatif = "0.9.0"
console = "0.6.2"
syntect = "3.0.2"
notify = "4.0.0"
# v5.2.1
argh = "0.1"
indicatif = "0.16"
console = "0.15"
notify = "4.0"
toml = "0.5"
regex = "1.5"
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0.81"
home = "0.5.3"
glob = "0.3.0"

[dev-dependencies]
assert_cmd = "0.11.0"
predicates = "1.0.1"
glob = "0.3.0"
```

## rustlings v1.0

### main

根据参数，执行不同的函数。

```rust
main():
    if not_match():
        println!("rustling");
    if match("run"):
        run(matches.clone());
    if match("verify"):
        verify();
    if match("watch"):
        watch();
    if not_match():
        print_file("default_out.md");
```

### run

* 如果是测试文件，继续执行，否则 `panic` 报错。
    * 如果文件名有 `test`，执行测试后退出。
    * 如果调用 `rustc` 正常编译，向下执行，否则报编译错误。
        * 如果能运行生成的可执行文件，提示运行成功，否则报运行错误。

```rust
run():
    if let filename = matches.valueof("file"):
        if matches.is_present("test")
            test();
            exit(0);
        let compile_cmd = fork("rustc");
        if compile_cmd.success():
            let run_cmd = fork("a.out");
            if run_cmd.success():
                println!("✅✓ Successfully ran" + filename);
            else:
                println!("⚠️! Ran" + filename + " with errors");
        else:
            println!("⚠️! Compilation of " + filename + " failed! Compiler error message:\n");
    else:
        panic!("Please supply a filename!");
```

### verify

遍历 `exercises` 下的文件，带有 `test` 文件名的执行测试，其他文件执行只编译。

测试和只编译只是运行 `rustc` 的参数不同。

```rust
verify():
    compile_only("xxx.rs");
    test("xxx/test.rs");

compile_only():
    compilecmd = Command::new("rustc").args(["..."]);
    if compilecmd.status.success():
        println!("✅✓ Successfully compiled " + filename);
    else:
        println!("⚠️! Compilation of " + filename + " failed! Compiler error message:\n");

test():
    compilecmd = Command::new("rustc").args(["--test", "..."]);
    // same to compile_only();
```

### watch

2 秒执行一行 `verify()`，有错误就报错，没有就再次执行 `verify()`。

```rust
watch():
    let (tx, rx) = channel();
    let watch = Watcher::new(tx, Duration::from_secs(2))?;
    watcher.watch("./exercises", RecursiveMode::Recursive)?;

verify();

loop {
        match rx.recv() {
            OK {
                verify();
            },
            Err(e):
                println!(watch error: " + e);
        }
    }
```

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