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use std::{io, iter::repeat, ops::Rem};
use crate::theme::{SimpleTheme, TermThemeRenderer, Theme};
use console::{Key, Term};
pub struct MultiSelect<'a> {
defaults: Vec<bool>,
items: Vec<String>,
prompt: Option<String>,
clear: bool,
theme: &'a dyn Theme,
paged: bool,
page_size: u32,
}
impl<'a> Default for MultiSelect<'a> {
fn default() -> MultiSelect<'a> {
MultiSelect::new()
}
}
impl<'a> MultiSelect<'a> {
pub fn new() -> MultiSelect<'static> {
MultiSelect::with_theme(&SimpleTheme)
}
pub fn with_theme(theme: &'a dyn Theme) -> MultiSelect<'a> {
MultiSelect {
items: vec![],
defaults: vec![],
clear: true,
prompt: None,
theme,
paged: false,
page_size: 10,
}
}
pub fn paged(&mut self, val: bool) -> &mut MultiSelect<'a> {
self.paged = val;
self
}
pub fn page_size(&mut self, val: u32) -> &mut MultiSelect<'a> {
self.page_size = if val <= 0 { 10 } else { val };
self
}
pub fn clear(&mut self, val: bool) -> &mut MultiSelect<'a> {
self.clear = val;
self
}
pub fn defaults(&mut self, val: &[bool]) -> &mut MultiSelect<'a> {
self.defaults = val
.to_vec()
.iter()
.cloned()
.chain(repeat(false))
.take(self.items.len())
.collect();
self
}
#[inline]
pub fn item<T: ToString>(&mut self, item: T) -> &mut MultiSelect<'a> {
self.item_checked(item, false)
}
pub fn item_checked<T: ToString>(&mut self, item: T, checked: bool) -> &mut MultiSelect<'a> {
self.items.push(item.to_string());
self.defaults.push(checked);
self
}
pub fn items<T: ToString>(&mut self, items: &[T]) -> &mut MultiSelect<'a> {
for item in items {
self.items.push(item.to_string());
self.defaults.push(false);
}
self
}
pub fn items_checked<T: ToString>(&mut self, items: &[(T, bool)]) -> &mut MultiSelect<'a> {
for &(ref item, checked) in items {
self.items.push(item.to_string());
self.defaults.push(checked);
}
self
}
pub fn with_prompt<S: Into<String>>(&mut self, prompt: S) -> &mut MultiSelect<'a> {
self.prompt = Some(prompt.into());
self
}
pub fn interact(&self) -> io::Result<Vec<usize>> {
self.interact_on(&Term::stderr())
}
pub fn interact_on(&self, term: &Term) -> io::Result<Vec<usize>> {
let mut page = 0;
if self.items.is_empty() {
return Err(io::Error::new(
io::ErrorKind::Other,
"Empty list of items given to `MultiSelect`",
));
}
let capacity = if self.paged {
if self.page_size > 0 {
self.page_size as usize
} else {
10 as usize
}
} else {
self.items.len()
};
let pages = (self.items.len() as f64 / capacity as f64).ceil() as usize;
let mut render = TermThemeRenderer::new(term, self.theme);
let mut sel = 0;
let mut prompt_string: String = String::from("");
if let Some(ref prompt) = self.prompt {
prompt_string = String::from(prompt);
}
let mut size_vec = Vec::new();
for items in self
.items
.iter()
.flat_map(|i| i.split('\n'))
.collect::<Vec<_>>()
{
let size = &items.len();
size_vec.push(*size);
}
let mut checked: Vec<bool> = self.defaults.clone();
let mut search_string: String = String::from("");
let original_items = self.items.clone();
loop {
let render_prompt_str = format!("{} {}", prompt_string, search_string);
render.clear()?;
render.multi_select_prompt(&render_prompt_str)?;
let filtered_indexed_items: Vec<_> = original_items
.iter()
.enumerate()
.filter(|&(_, item)| {
search_string.len() == 0
|| item.to_lowercase().contains(&search_string.to_lowercase())
})
.map(|(idx, item)| (item, idx))
.collect();
let filtered_items: Vec<_> = filtered_indexed_items
.iter()
.map(|(item, _)| item)
.collect();
for (idx, item) in filtered_items
.iter()
.enumerate()
.skip(page * capacity)
.take(capacity)
{
let (_, orig_idx) = filtered_indexed_items[idx];
render.multi_select_prompt_item(item, checked[orig_idx], sel == idx)?;
}
term.hide_cursor()?;
term.flush()?;
match term.read_key()? {
Key::ArrowDown => {
if sel == !0 {
sel = 0;
} else {
sel = (sel as u64 + 1).rem(filtered_items.len() as u64) as usize;
}
}
Key::ArrowUp => {
if sel == !0 {
sel = filtered_items.len() - 1;
} else {
sel = ((sel as i64 - 1 + filtered_items.len() as i64)
% (filtered_items.len() as i64)) as usize;
}
}
Key::ArrowLeft => {
if self.paged {
if page == 0 {
page = pages - 1;
} else {
page -= 1;
}
sel = page * capacity;
}
}
Key::ArrowRight => {
if self.paged {
if page == pages - 1 {
page = 0;
} else {
page += 1;
}
sel = page * capacity;
}
}
Key::Char(' ') => {
let (_, orig_idx) = filtered_indexed_items[sel];
checked[orig_idx] = !checked[orig_idx];
}
Key::Escape => {
if self.clear {
render.clear()?;
}
if let Some(ref prompt) = self.prompt {
render.multi_select_prompt_selection(prompt, &[][..])?;
}
term.show_cursor()?;
term.flush()?;
return Ok(self
.defaults
.clone()
.into_iter()
.enumerate()
.filter_map(|(idx, checked)| if checked { Some(idx) } else { None })
.collect());
}
Key::Enter => {
if self.clear {
render.clear()?;
}
if let Some(ref prompt) = self.prompt {
let selections: Vec<_> = checked
.iter()
.enumerate()
.filter_map(|(idx, &checked)| {
if checked {
Some(self.items[idx].as_str())
} else {
None
}
})
.collect();
render.multi_select_prompt_selection(prompt, &selections[..])?;
}
term.show_cursor()?;
term.flush()?;
return Ok(checked
.into_iter()
.enumerate()
.filter_map(|(idx, checked)| if checked { Some(idx) } else { None })
.collect());
}
Key::Char(x) => {
search_string.push(x);
}
Key::Backspace => {
if search_string.len() > 0 {
search_string.pop();
}
}
_ => {}
}
if sel < page * capacity || sel >= (page + 1) * capacity {
page = sel / capacity;
}
render.clear_preserve_prompt(&size_vec)?;
}
}
}