[−][src]Crate execute

Execute

This library is for extending Command in order to execute programs more easily.

Usage

extern crate execute;

use std::process::Command;

use execute::Execute;

// ...

Since Command is used for spawning a process of a command and the executed progrom is external which may not exist or may not be the program that we expected, we usually need to verify the external program at runtime.

The execute_check_exit_status_code method can be used to execute a command and check its exit status. For example,

extern crate execute;

use std::process::Command;

use execute::Execute;

const FFMPEG_PATH: &str = "/path/to/ffmpeg";

let mut first_command = Command::new(FFMPEG_PATH);

first_command.arg("-version");

if first_command.execute_check_exit_status_code(0).is_err() {
    eprintln!("The path `{}` is not a correct FFmpeg executable binary file.", FFMPEG_PATH);
}

Execute and Get the Exit Status

extern crate execute;

use std::process::Command;

use execute::Execute;

const FFMPEG_PATH: &str = "/path/to/ffmpeg";

let mut command = Command::new(FFMPEG_PATH);

command.arg("-i");
command.arg("/path/to/media-file");
command.arg("/path/to/output-file");

if let Some(exit_code) = command.execute().unwrap() {
    if exit_code == 0 {
        println!("Ok.");
    } else {
        eprintln!("Failed.");
    }
} else {
    eprintln!("Interrupted!");
}

Execute and Get the Output

Output to the Screen

extern crate execute;

use std::process::Command;

use execute::Execute;

const FFMPEG_PATH: &str = "/path/to/ffmpeg";

let mut command = Command::new(FFMPEG_PATH);

command.arg("-i");
command.arg("/path/to/media-file");
command.arg("/path/to/output-file");

let output = command.execute_output().unwrap();

if let Some(exit_code) = output.status.code() {
    if exit_code == 0 {
        println!("Ok.");
    } else {
        eprintln!("Failed.");
    }
} else {
    eprintln!("Interrupted!");
}

Output to Memory (Captured)

extern crate execute;

use std::process::{Command, Stdio};

use execute::Execute;

const FFMPEG_PATH: &str = "/path/to/ffmpeg";

let mut command = Command::new(FFMPEG_PATH);

command.arg("-i");
command.arg("/path/to/media-file");
command.arg("/path/to/output-file");

command.stdout(Stdio::piped());
command.stderr(Stdio::piped());

let output = command.execute_output().unwrap();

if let Some(exit_code) = output.status.code() {
    if exit_code == 0 {
        println!("Ok.");
    } else {
        eprintln!("Failed.");
    }
} else {
    eprintln!("Interrupted!");
}

println!("{}", String::from_utf8(output.stdout).unwrap());
println!("{}", String::from_utf8(output.stderr).unwrap());

Execute and Input Data

Input In-memory Data

extern crate execute;

use std::process::{Command, Stdio};

use execute::Execute;

let mut bc_command = Command::new("bc");

bc_command.stdout(Stdio::piped());

let output = bc_command.execute_input_output("2^99\n").unwrap();

println!("Answer: {}", String::from_utf8(output.stdout).unwrap().trim_end());

Input from a Reader

extern crate execute;

use std::process::{Command, Stdio};
use std::fs::File;

use execute::Execute;

let mut cat_command = Command::new("cat");

cat_command.stdout(Stdio::piped());

let mut file = File::open("Cargo.toml").unwrap();

let output = cat_command.execute_input_reader_output(&mut file).unwrap();

println!("{}", String::from_utf8(output.stdout).unwrap());

By default, the buffer size is 256 bytes. If you want to change that, you can use the _reader_output2 or _reader2 methods and define a length explicitly.

For example, to change the buffer size to 4096 bytes,

extern crate execute;

use std::process::{Command, Stdio};
use std::fs::File;

use execute::generic_array::typenum::U4096;
use execute::Execute;

let mut cat_command = Command::new("cat");

cat_command.stdout(Stdio::piped());

let mut file = File::open("Cargo.toml").unwrap();

let output = cat_command.execute_input_reader_output2::<U4096>(&mut file).unwrap();

println!("{}", String::from_utf8(output.stdout).unwrap());

Execute Many Commands and Pipe Them Together

extern crate execute;

use std::process::{Command, Stdio};

use execute::Execute;

let mut command1 = Command::new("echo");
command1.arg("HELLO WORLD");

let mut command2 = Command::new("cut");
command2.arg("-d").arg(" ").arg("-f").arg("1");

let mut command3 = Command::new("tr");
command3.arg("A-Z").arg("a-z");

command3.stdout(Stdio::piped());

let output = command1.execute_many_output(&mut [&mut command2, &mut command3]).unwrap();

assert_eq!(b"hello\n", output.stdout.as_slice());

Re-exports

pub extern crate generic_array;

Traits

Execute