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CommandSpec

Struct CommandSpec 

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pub struct CommandSpec {
    pub program: OsString,
    pub args: Vec<OsString>,
    pub cwd: Option<PathBuf>,
}
Expand description

一条待执行的命令。

纯数据:插件只描述“跑什么“,不负责跑。真正的 spawn 由宿主做 —— 这样 stdio、 环境、退出码的处理只有一处实现,插件不会各写各的。

§构造是链式的,而且是消费式的

ⓘ
let spec = CommandSpec::new("cargo")
    .arg("add")
    .args(args.iter())
    .cwd("/somewhere");

消费式(self → Self)而不是 &mut self,是为了让上面这种写法直接产出一个值, 不用先 let mut 再逐行调。

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§program: OsString

可执行文件。宿主会用 which 解析成真实路径,并按平台决定要不要包一层 cmd /C(Windows 上 pnpm 是 pnpm.cmd,直接 spawn 会失败)。

§args: Vec<OsString>

参数,按顺序。

§cwd: Option<PathBuf>

工作目录覆盖。None = 用宿主给的项目根。

Implementations§

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impl CommandSpec

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pub fn new(program: impl Into<OsString>) -> Self

指定可执行文件。

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pub fn arg(self, arg: impl Into<OsString>) -> Self

追加一个参数。

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pub fn args<I, S>(self, args: I) -> Self
where I: IntoIterator<Item = S>, S: Into<OsString>,

追加一批参数。

args.iter()(&[OsString])可以直接传进来 —— &OsString: Into<OsString>, 所以这是无损的,不会像 String 那样在 Unix 上把非 UTF-8 参数改坏。

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pub fn cwd(self, dir: impl Into<PathBuf>) -> Self

覆盖工作目录。

Trait Implementations§

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impl Clone for CommandSpec

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CommandSpec

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Eq for CommandSpec

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impl PartialEq for CommandSpec

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fn eq(&self, other: &Self) -> bool

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=. Read more
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impl StructuralPartialEq for CommandSpec

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = !

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, !>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.