Function call_python3

src/fileio.rs:15–51

Writes a python file and call python3 on it # Arguments `python_commands` - Python commands to be written to file `output_dir` - Output directory to be created `filename_py` - Filename with extension .py

(python_exe: &str, python_commands: &String, path: &Path)

/// * `output_dir` - Output directory to be created
/// * `filename_py` - Filename with extension .py
pub(crate) fn call_python3(python_exe: &str, python_commands: &String, path: &Path) -> Result<String, StrError> {
    // create directory
    if let Some(p) = path.parent() {
        fs::create_dir_all(p).map_err(|_| "cannot create directory")?;
    }

    // combine header with commands
    let mut contents = String::new();
    contents.push_str(python_commands);

    // write file
    let mut file = File::create(path).map_err(|_| "cannot create file")?;
    file.write_all(contents.as_bytes()).map_err(|_| "cannot write file")?;

    // force sync
    file.sync_all().map_err(|_| "cannot sync file")?;

    // execute file
    let output = Command::new(python_exe)
        .arg(path)
        .output()
        .map_err(|_| "cannot run python3")?;

    // results
    let out = String::from_utf8(output.stdout).unwrap();
    let err = String::from_utf8(output.stderr).unwrap();
    let mut results = String::new();
    if out.len() > 0 {
        results.push_str(&out);
    }
    if err.len() > 0 {
        results.push_str(&err)
    }

    // done
    Ok(results)
}

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