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use std::path;
use std::slice::{Iter, IterMut};
use crate::config::option::DisplayOption;
use crate::context::UiContext;
use crate::fs::{JoshutoDirEntry, JoshutoMetadata};
use crate::history::read_directory;
#[derive(Clone, Debug)]
pub struct JoshutoDirList {
path: path::PathBuf,
pub contents: Vec<JoshutoDirEntry>,
pub metadata: JoshutoMetadata,
/// The cursor position in this dir list
index: Option<usize>,
/// The index in this dir list to start with when rendering the list
viewport_index: usize,
_need_update: bool,
}
impl JoshutoDirList {
pub fn new(
path: path::PathBuf,
contents: Vec<JoshutoDirEntry>,
index: Option<usize>,
viewport_index: usize,
metadata: JoshutoMetadata,
) -> Self {
Self {
path,
contents,
metadata,
index,
viewport_index,
_need_update: false,
}
}
pub fn from_path(path: path::PathBuf, options: &DisplayOption) -> std::io::Result<Self> {
let filter_func = options.filter_func();
let mut contents = read_directory(path.as_path(), filter_func, options)?;
let sort_options = options.sort_options_ref();
contents.sort_by(|f1, f2| sort_options.compare(f1, f2));
let index = if contents.is_empty() { None } else { Some(0) };
let metadata = JoshutoMetadata::from(&path)?;
Ok(Self {
path,
contents,
metadata,
_need_update: false,
index,
viewport_index: if let Some(ix) = index { ix } else { 0 },
})
}
pub fn get_index(&self) -> Option<usize> {
self.index
}
fn update_viewport(&mut self, ui_context: &UiContext, options: &DisplayOption) {
if let Some(ix) = self.index {
let height = ui_context.layout[0].height as usize;
// get scroll buffer size, corrected in case of too small terminal
let scroll_offset = if height < 4 {
0
} else if options.scroll_offset() * 2 > height - 1 {
height / 2 - 1
} else {
options.scroll_offset()
};
// calculate viewport
let viewport_end = self.viewport_index + height;
let new_viewport_end = scroll_offset + ix + 1;
if self.len() < new_viewport_end {
// cursor at the end
self.viewport_index = self.len().saturating_sub(height);
} else if viewport_end < new_viewport_end {
// cursor too low
self.viewport_index = new_viewport_end - height;
} else if ix.saturating_sub(self.viewport_index) < scroll_offset {
// cursor too high or at the beginning
self.viewport_index = ix.saturating_sub(scroll_offset);
}
} else {
self.viewport_index = 0;
}
}
pub fn set_index(
&mut self,
index: Option<usize>,
ui_context: &UiContext,
options: &DisplayOption,
) {
if index == self.index {
return;
}
self.index = index;
if !ui_context.layout.is_empty() {
self.update_viewport(ui_context, options);
}
}
pub fn iter(&self) -> Iter<JoshutoDirEntry> {
self.contents.iter()
}
pub fn iter_mut(&mut self) -> IterMut<JoshutoDirEntry> {
self.contents.iter_mut()
}
pub fn len(&self) -> usize {
self.contents.len()
}
pub fn is_empty(&self) -> bool {
self.contents.is_empty()
}
pub fn modified(&self) -> bool {
let metadata = std::fs::symlink_metadata(self.file_path());
match metadata {
Ok(m) => match m.modified() {
Ok(s) => s > self.metadata.modified(),
_ => false,
},
_ => false,
}
}
pub fn depreciate(&mut self) {
self._need_update = true;
}
pub fn need_update(&self) -> bool {
self._need_update || self.modified()
}
pub fn file_path(&self) -> &path::PathBuf {
&self.path
}
pub fn any_selected(&self) -> bool {
self.contents.iter().any(|e| e.is_selected())
}
pub fn iter_selected(&self) -> impl Iterator<Item = &JoshutoDirEntry> {
self.contents.iter().filter(|entry| entry.is_selected())
}
pub fn iter_selected_mut(&mut self) -> impl Iterator<Item = &mut JoshutoDirEntry> {
self.contents.iter_mut().filter(|entry| entry.is_selected())
}
pub fn get_selected_paths(&self) -> Vec<path::PathBuf> {
let vec: Vec<path::PathBuf> = self
.iter_selected()
.map(|e| e.file_path().to_path_buf())
.collect();
if !vec.is_empty() {
vec
} else {
match self.curr_entry_ref() {
Some(s) => vec![s.file_path().to_path_buf()],
_ => vec![],
}
}
}
pub fn curr_entry_ref(&self) -> Option<&JoshutoDirEntry> {
self.get_curr_ref_(self.index?)
}
pub fn curr_entry_mut(&mut self) -> Option<&mut JoshutoDirEntry> {
self.get_curr_mut_(self.index?)
}
/// Returns the index of the first entry to be printed in a UI dir list
pub fn first_index_for_viewport(&self) -> usize {
self.viewport_index
}
fn get_curr_mut_(&mut self, index: usize) -> Option<&mut JoshutoDirEntry> {
if index < self.contents.len() {
Some(&mut self.contents[index])
} else {
None
}
}
fn get_curr_ref_(&self, index: usize) -> Option<&JoshutoDirEntry> {
if index < self.contents.len() {
Some(&self.contents[index])
} else {
None
}
}
}
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