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use super::*;
pub struct DirectoryListing {
children: Vec<DirectoryChild>,
length: u32,
selected: Option<u32>,
name_buffer: CircularPathBuffer,
}
impl DirectoryListing {
pub fn from_path(path: &BedrockFilePath) -> Option<Self> {
macro_rules! unres {
($result:expr) => { match $result { Ok(v) => v, Err(_) => continue} };
}
macro_rules! unopt {
($option:expr) => { match $option { Some(v) => v, None => continue} };
}
let mut children = Vec::new();
let dir_listing = std::fs::read_dir(path.as_path()).ok()?;
for (i, entry_result) in dir_listing.enumerate() {
// Firebreak to prevent emulator from consuming an absurd amount
// of memory when opening too large of a directory.
if i == (u16::MAX as usize) {
break;
}
let entry = unres!(entry_result);
let entry_path = unopt!(BedrockFilePath::from_path(&entry.path(), path.base()));
if entry_path.filename_is_dot_prefixed() {
continue;
}
let metadata = unres!(std::fs::metadata(&entry.path()));
let entry_type =
if metadata.is_file() {
EntryType::File
} else if metadata.is_dir() {
EntryType::Directory
} else {
continue;
};
let child = DirectoryChild { path: entry_path, entry_type };
children.push(child);
}
children.sort();
let length = u32::try_from(children.len()).ok()?;
let selected = None;
let name_buffer = CircularPathBuffer::new();
Some( Self { children, length, selected, name_buffer } )
}
/// Attempts to return a directory child by index.
pub fn get(&self, index: u32) -> Option<&DirectoryChild> {
self.children.get(index as usize)
}
pub fn length(&self) -> u32 {
self.length
}
/// Returns the index of the selected child, or zero if no child is selected.
pub fn selected(&self) -> u32 {
self.selected.unwrap_or(0)
}
/// Attempts to select a child by index.
pub fn set_selected(&mut self, index: u32) {
if let Some(child) = self.get(index) {
let buffer = child.path.as_buffer();
self.name_buffer.populate(buffer);
self.selected = Some(index);
} else {
self.name_buffer.clear();
self.selected = None;
}
}
pub fn child_name(&mut self) -> &mut CircularPathBuffer {
&mut self.name_buffer
}
pub fn child_type(&self) -> Option<EntryType> {
self.selected.and_then(|s| self.get(s).and_then(|i| Some(i.entry_type)))
}
pub fn child_path(&self) -> Option<BedrockFilePath> {
self.selected.and_then(|s| self.get(s).and_then(|i| Some(i.path.clone())))
}
}
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