Creating directories

We'll start by handling the command to create a new directory. So, we add a case in handle_cmd():

#[async]
fn handle_cmd(mut self, cmd: Command) -> Result<Self> {
    match cmd {
        Command::Mkd(path) => self = await!(self.mkd(path))?,
        // …
    }
}

And the function handling this command is:

use std::fs::create_dir;

#[async]
fn mkd(mut self, path: PathBuf) -> Result<Self> {
    let path = self.cwd.join(&path);
    let parent = get_parent(path.clone());
    if let Some(parent) = parent {
        let parent = parent.to_path_buf();
        let (new_self, res) = self.complete_path(parent);
        self = new_self;
        if let Ok(mut dir) = res {

We first check that the parent directory is valid and under the server root:

            if dir.is_dir() {
                let filename = get_filename(path);
                if let Some(filename) = filename {
                    dir.push(filename);
                    if create_dir(dir).is_ok(...