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use std::io::{self, ErrorKind, Result};
use std::{
ffi::OsString,
path::{Component, Path, PathBuf},
sync::Arc,
};
use super::fs::{
has_parent, resolve, resolve_parent, root_fs, MemoryFd, Parent,
PathTarget,
};
/// A builder for creating directories in various manners.
#[derive(Debug, Default)]
pub struct DirBuilder {
/// Indicates whether to create parent directories
/// if they are missing.
recursive: bool,
}
impl DirBuilder {
/// Creates a new set of options with default
/// mode/security settings for all platforms and also non-recursive.
pub fn new() -> Self {
Default::default()
}
/// Indicates whether to create directories
/// recursively (including all parent directories).
/// Parents that do not exist are created with the
/// same security and permissions settings.
///
/// This option defaults to `false`.
pub fn recursive(&mut self, recursive: bool) -> &mut Self {
self.recursive = recursive;
self
}
/// Creates the specified directory with the configured options.
///
/// It is considered an error if the directory already exists unless
/// recursive mode is enabled.
///
/// # Errors
///
/// An error will be returned under the following circumstances:
///
/// * Path already points to an existing file.
/// * Path already points to an existing directory and the mode is
/// non-recursive.
/// * The calling process doesn't have permissions to create the directory
/// or its missing parents.
/// * Other I/O error occurred.
pub async fn create(&self, path: impl AsRef<Path>) -> Result<()> {
if self.recursive {
let mut current = Parent::Root(root_fs());
let mut buf = PathBuf::new();
#[allow(unused_assignments)]
let mut file_name: Option<OsString> = None;
for component in path.as_ref().components() {
match component {
Component::RootDir => {
continue;
}
Component::Normal(name) => {
buf = buf.join(name);
file_name = Some(name.to_owned());
}
_ => unimplemented!(),
}
// Got a directory to make
if let Some(file_name) = file_name {
// See if a folder already exists at the location
if let Some(target) = resolve(&buf).await {
match target {
PathTarget::Descriptor(parent) => {
let fd = parent.read().await;
match &*fd {
MemoryFd::Dir(_dir) => {
current = Parent::Folder(Arc::clone(
&parent,
));
}
_ => {
return Err(
ErrorKind::PermissionDenied
.into(),
)
}
}
}
PathTarget::Root(_) => {
return Err(ErrorKind::PermissionDenied.into())
}
}
} else {
let fd = current.mkdir(file_name).await?;
current = Parent::Folder(fd);
}
}
}
Ok(())
} else {
let file_name = path.as_ref().file_name().ok_or_else(|| {
let err: io::Error = ErrorKind::PermissionDenied.into();
err
})?;
let has_parent = has_parent(path.as_ref());
if has_parent {
if let Some(target) = resolve_parent(path.as_ref()).await {
match target {
PathTarget::Descriptor(parent) => {
let is_dir = {
let fd = parent.read().await;
matches!(&*fd, MemoryFd::Dir(_))
};
if is_dir {
Parent::Folder(parent)
.mkdir(file_name.to_owned())
.await?;
} else {
return Err(
ErrorKind::PermissionDenied.into()
);
}
}
PathTarget::Root(fs) => {
Parent::Root(fs)
.mkdir(file_name.to_owned())
.await?;
}
}
Ok(())
} else {
Err(ErrorKind::NotFound.into())
}
} else {
Parent::Root(root_fs()).mkdir(file_name.to_owned()).await?;
Ok(())
}
}
}
}
/// Creates a new, empty directory at the provided path.
pub async fn create_dir(path: impl AsRef<Path>) -> Result<()> {
DirBuilder::new().create(path).await
}
/// Recursively creates a directory and all of its parent
/// components if they are missing.
pub async fn create_dir_all(path: impl AsRef<Path>) -> Result<()> {
DirBuilder::new().recursive(true).create(path).await
}