justrs/
execute_shell_command.rs

1// use std::process::{Command, Output};
2
3// pub type Result<T> = core::result::Result<T, Error>;
4// pub type Error = Box<dyn std::error::Error>; // For early dev.
5
6// pub fn execute_shell_command<T>(command: &str) -> Result<T>
7// where
8//     T: std::convert::From<std::string::String> + std::str::FromStr,
9// {
10//     let output: Output = Command::new("sh")
11//         .arg("-c")
12//         .arg(command)
13//         .output()
14//         .map_err(|e| format!("Failed to execute command: {}", e))?;
15
16//     if output.status.success() {
17//         let stdout = String::from_utf8_lossy(&output.stdout).to_string();
18//         Ok(format!("Success : {}", stdout).into())
19//     } else {
20//         let stderr = String::from_utf8_lossy(&output.stderr).to_string();
21//         Err(format!("Command failed: {}", stderr).into())
22//     }
23// }
24
25use std::{process::Command, str::FromStr};
26
27pub type Result<T> = core::result::Result<T, Error>;
28pub type Error = Box<dyn std::error::Error + Send + Sync>;
29
30/// Execute `command` via `sh -c` and parse stdout into `T`.
31/// `T` must implement `FromStr` and its error must implement `Display`.
32pub fn execute_shell_command<T>(command: &str) -> Result<T>
33where
34    T: FromStr,
35    <T as FromStr>::Err: std::fmt::Display,
36{
37    let output = Command::new("sh")
38        .arg("-c")
39        .arg(command)
40        .output()
41        .map_err(|e| format!("Failed to execute command: {}", e))?;
42
43    if output.status.success() {
44        // parse the stdout (trim trailing newline/whitespace)
45        let stdout = String::from_utf8_lossy(&output.stdout).to_string();
46        let trimmed = stdout.trim();
47        let parsed = trimmed.parse::<T>().map_err(|e| {
48            format!(
49                "Failed to parse stdout (`{}`) into target type: {}",
50                trimmed, e
51            )
52        })?;
53        Ok(parsed)
54    } else {
55        let stderr = String::from_utf8_lossy(&output.stderr).to_string();
56        Err(format!("Command failed: {}", stderr).into())
57    }
58}
justrs/execute_shell_command.rs

justrs/
execute_shell_command.rs
