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use super::*;
use std::ffi::OsString;
use std::os::unix::ffi::{OsStrExt, OsStringExt};
use std::path::{Component, Path, PathBuf};
pub struct DirectoryListing {
children: Vec<DirectoryChild>,
length: u32,
selected: Option<u32>,
name_buffer: CircularPathBuffer,
}
impl DirectoryListing {
pub fn from_path(path: &Path, base: &Path) -> Result<Self, ()> {
macro_rules! continue_on_err {
($result:expr) => { match $result { Ok(v) => v, Err(_) => continue} };
}
let mut children = Vec::new();
if let Ok(iter_dir) = std::fs::read_dir(path) {
for (i, entry_result) in iter_dir.enumerate() {
if i == u16::MAX as usize {
eprintln!("Warning, {path:?} contains more than 65536 entries.")
};
let entry = continue_on_err!(entry_result);
let path = continue_on_err!(remove_base(&entry.path(), &base));
let byte_path = path.as_os_str().as_bytes();
if byte_path.len() > 255 {
continue;
};
if filename_dot_prefixed(&path) {
continue;
}
let metadata = continue_on_err!(std::fs::metadata(&entry.path()));
children.push( DirectoryChild {
byte_path: Vec::from(byte_path),
entry_type: if metadata.is_file() {
EntryType::File
} else if metadata.is_dir() {
EntryType::Directory
} else {
continue;
},
} )
}
children.sort_unstable();
let length = u32::try_from(children.len()).unwrap_or(u32::MAX);
let selected = None;
let name_buffer = CircularPathBuffer::new();
Ok(Self { children, length, selected, name_buffer } )
} else {
Err(())
}
}
pub fn get(&self, index: u32) -> Option<&DirectoryChild> {
self.children.get(index as usize)
}
pub fn length(&self) -> u32 {
self.length
}
pub fn selected(&self) -> u32 {
self.selected.unwrap_or(0)
}
pub fn set_selected(&mut self, index: u32) {
if let Some(info) = self.get(index) {
self.name_buffer.populate(&info.byte_path.clone());
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<PathBuf> {
self.selected.and_then(|s| self.get(s).and_then(|i| {
let os_string: OsString = OsStringExt::from_vec(i.byte_path.clone());
Some(os_string.into())
}))
}
}
pub fn remove_base(absolute_path: &Path, base_path: &Path) -> Result<PathBuf, ()> {
if let Ok(relative) = absolute_path.strip_prefix(base_path) {
let mut baseless_path = PathBuf::from("/");
for component in relative.components() {
match component {
Component::Normal(s) => baseless_path.push(s),
Component::ParentDir => return Err(()),
Component::CurDir => continue,
Component::RootDir => continue,
Component::Prefix(_) => continue,
}
}
return Ok(baseless_path);
}
return Err(());
}
// Returns true if a dot character directly follows the right-most
// forward-slash character in the path.
fn filename_dot_prefixed(path: &Path) -> bool {
let bytes = path.as_os_str().as_bytes();
// Find position of final forward-slash byte.
let mut final_slash = None;
for (i, byte) in bytes.iter().enumerate() {
if *byte == b'/' { final_slash = Some(i) }
}
if let Some(i) = final_slash {
if let Some(b'.') = bytes.get(i+1) {
return true;
}
}
return false;
}
|
