[−][src]Struct devx_cmd::Cmd
More convenient version of std::process::Command
. Allows for
spawning child processes with or without capturing their stdout.
It also comes with inbuilt logging of the invocations to stderr
.
All the methods for invoking a Cmd
:
For more laconic usage see cmd
and other macros.
Example:
let mut cmd = Cmd::new("cargo"); cmd // `arg*()` methods append arguments .arg("metadata") .arg2("--color", "never") .args(&["--verbose", "--no-deps", "--all-features"]) .replace_arg(3, "--quiet") // `echo*()` are `true` by default .echo_cmd(false) .echo_err(false) // repetated `stdin*()` calls overwrite previous ones .stdin("Hi") .stdin_bytes(vec![0, 1, 2]); let () = cmd.run()?; let output: String = cmd.read()?; let output: Vec<u8> = cmd.read_bytes()?; let process: Child = cmd.spawn()?;
Implementations
impl Cmd
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pub fn new(bin: impl Into<PathBuf>) -> Self
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Returns a command builder that invokes the binary at bin
.
You should also be able to pass the command by name if it is in PATH
.
Does not verify that the binary is actually available at the given path. If it isn't, then an error will be returned when executing the command.
pub fn try_at(bin_path: impl Into<PathBuf>) -> Option<Self>
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Returns a command builder if there is some file available at bin_path
.
If there is no file at the given path returns None
.
Beware that this won't take PATH
env variable into account.
This function expects a relative or absolute filesystem path to the binary,
and tries to check if there is some file there
(retrying with .exe
extension on windows).
If you want to find a binary through PATH
, you should use
Cmd::lookup_in_path
pub fn lookup_in_path(bin_name: &str) -> Option<Self>
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Returns a command builder for the given bin_name
only if this
bin_name
is accessible trough PATH
env variable, otherwise returns None
pub fn bin(&mut self, bin: impl Into<PathBuf>) -> &mut Self
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Set binary path, overwrites the path that was set before.
pub fn current_dir(&mut self, dir: impl Into<PathBuf>) -> &mut Self
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Set the current directory for the child process.
Inherits this process current dir by default.
pub fn echo_cmd(&mut self, yes: bool) -> &mut Self
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When set to true
the command with its arguments will be logged to stderr
.
The command's output will also be logged to stderr
.
Default: true
pub fn echo_err(&mut self, yes: bool) -> &mut Self
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When set to true
the invocation error will be logged to stderr
.
Set it to false
if non-zero exit code is an expected/recoverable error
which doesn't need to be logged.
Default: true
pub fn stdin(&mut self, stdin: impl Into<String>) -> &mut Self
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Sets the string input passed to child process's stdin
.
This overwrites the previous value.
Use Cmd::stdin_bytes
if you need to pass non-utf8 byte sequences.
Nothing is written to stdin
by default.
pub fn stdin_bytes(&mut self, stdin: Vec<u8>) -> &mut Self
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Sets the bytes input passed to child process's stdin
.
This overwrites the previous value.
Nothing is written to stdin
by default.
pub fn arg2(
&mut self,
arg1: impl Into<OsString>,
arg2: impl Into<OsString>
) -> &mut Self
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&mut self,
arg1: impl Into<OsString>,
arg2: impl Into<OsString>
) -> &mut Self
Same as cmd.arg(arg1).arg(arg2)
. This is just a convenient shortcut
mostly used to lexically group related arguments (for example named arguments).
pub fn arg(&mut self, arg: impl Into<OsString>) -> &mut Self
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Appends a single argument to the list of arguments passed to the child process.
pub fn replace_arg(&mut self, idx: usize, arg: impl Into<OsString>) -> &mut Self
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Replaces the argument at the given index with a new value.
Panics
Panics if the given index is out of range of the arguments already set on this command builder.
pub fn args<I>(&mut self, args: I) -> &mut Self where
I: IntoIterator,
I::Item: Into<OsString>,
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I: IntoIterator,
I::Item: Into<OsString>,
Extends the array of arguments passed to the child process with args
.
pub fn run(&self) -> Result<()>
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Same as cmd.spawn()?.wait()
See Child::wait
for details.
pub fn read(&self) -> Result<String>
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Same as cmd.spawn_piped()?.read()
See Child::read
for details.
pub fn read_bytes(&self) -> Result<Vec<u8>>
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Same as cmd.spawn_piped()?.read_bytes()
See Child::read_bytes
for details.
pub fn spawn(&self) -> Result<Child>
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Spawns a child process returning a handle to it.
The child inherits both stdout
and stderr
.
See the docs for Child
for more details.
Note that reading the child process output streams will panic!
If you want to read the output, see Cmd::spawn_piped
pub fn spawn_piped(&self) -> Result<Child>
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Spawns a child process returning a handle to it.
Child's stdout
will be piped for further reading from it, but
stderr
will be inherited.
See the docs for Child
for more details.
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for Cmd
impl Send for Cmd
impl Sync for Cmd
impl Unpin for Cmd
impl UnwindSafe for Cmd
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,