Function execute_vec_result_result 

pub fn execute_vec_result_result<T, TArg, TEnvKey, TEnvVal, TOuterError, TInnerError>(
    cmd: impl AsRef<OsStr>,
    args: impl IntoIterator<Item = TArg>,
    envs: impl IntoIterator<Item = (TEnvKey, TEnvVal)>,
) -> Result<Vec<Result<T, TInnerError>>, TOuterError>
where
    T: FromStr,
    TArg: AsRef<OsStr>,
    TEnvKey: AsRef<OsStr>,
    TEnvVal: AsRef<OsStr>,
    <T as FromStr>::Err: StdError,
    TOuterError: From<Error<<T as FromStr>::Err>>,
    TInnerError: From<Error<<T as FromStr>::Err>>,

Executes command with args and environment variables, parses output line by line, returns after reading whole output

• On invalid command: return error
• On error exit code: return error
• On parsing failure: collect error item
• Possible errors: ProcessNotSpawned, WaitFailed, ProcessFailed, StdoutUnreadable (item error), ParsingError (item error)

Designed for

use shellfn::shell;
use std::error::Error;

#[shell]
fn command() -> Result<Vec<Result<u32, Box<Error + 'static>>>, Box<Error>> {
    "echo 1; echo 2; echo 3"
}

assert_eq!(vec![1, 2, 3], command().unwrap().map(Result::unwrap).collect::<Vec<_>>())