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use crate::theme::{SimpleTheme, TermThemeRenderer, Theme};
use console::{Key, Term};
use fuzzy_matcher::FuzzyMatcher;
use std::{io, ops::Rem};
pub struct FuzzySelect<'a> {
default: usize,
items: Vec<String>,
prompt: String,
report: bool,
clear: bool,
highlight_matches: bool,
theme: &'a dyn Theme,
}
impl Default for FuzzySelect<'static> {
fn default() -> Self {
Self::new()
}
}
impl FuzzySelect<'static> {
pub fn new() -> Self {
Self::with_theme(&SimpleTheme)
}
}
impl FuzzySelect<'_> {
pub fn clear(&mut self, val: bool) -> &mut Self {
self.clear = val;
self
}
pub fn default(&mut self, val: usize) -> &mut Self {
self.default = val;
self
}
pub fn item<T: ToString>(&mut self, item: T) -> &mut Self {
self.items.push(item.to_string());
self
}
pub fn items<T: ToString>(&mut self, items: &[T]) -> &mut Self {
for item in items {
self.items.push(item.to_string());
}
self
}
pub fn with_prompt<S: Into<String>>(&mut self, prompt: S) -> &mut Self {
self.prompt = prompt.into();
self
}
pub fn report(&mut self, val: bool) -> &mut Self {
self.report = val;
self
}
pub fn highlight_matches(&mut self, val: bool) -> &mut Self {
self.highlight_matches = val;
self
}
#[inline]
pub fn interact(&self) -> io::Result<usize> {
self.interact_on(&Term::stderr())
}
#[inline]
pub fn interact_opt(&self) -> io::Result<Option<usize>> {
self.interact_on_opt(&Term::stderr())
}
#[inline]
pub fn interact_on(&self, term: &Term) -> io::Result<usize> {
self._interact_on(term, false)?
.ok_or_else(|| io::Error::new(io::ErrorKind::Other, "Quit not allowed in this case"))
}
#[inline]
pub fn interact_on_opt(&self, term: &Term) -> io::Result<Option<usize>> {
self._interact_on(term, true)
}
fn _interact_on(&self, term: &Term, allow_quit: bool) -> io::Result<Option<usize>> {
let mut position = 0;
let mut search_term = String::new();
let mut render = TermThemeRenderer::new(term, self.theme);
let mut sel = self.default;
let mut size_vec = Vec::new();
for items in self.items.iter().as_slice() {
let size = &items.len();
size_vec.push(*size);
}
let matcher = fuzzy_matcher::skim::SkimMatcherV2::default();
let visible_term_rows = (term.size().0 as usize).max(3) - 2;
let mut starting_row = 0;
term.hide_cursor()?;
loop {
render.clear()?;
render.fuzzy_select_prompt(self.prompt.as_str(), &search_term, position)?;
let mut filtered_list = self
.items
.iter()
.map(|item| (item, matcher.fuzzy_match(item, &search_term)))
.filter_map(|(item, score)| score.map(|s| (item, s)))
.collect::<Vec<_>>();
filtered_list.sort_unstable_by(|(_, s1), (_, s2)| s2.cmp(s1));
for (idx, (item, _)) in filtered_list
.iter()
.enumerate()
.skip(starting_row)
.take(visible_term_rows)
{
render.fuzzy_select_prompt_item(
item,
idx == sel,
self.highlight_matches,
&matcher,
&search_term,
)?;
term.flush()?;
}
match term.read_key()? {
Key::Escape if allow_quit => {
if self.clear {
render.clear()?;
term.flush()?;
}
term.show_cursor()?;
return Ok(None);
}
Key::ArrowUp | Key::BackTab if !filtered_list.is_empty() => {
if sel == 0 {
starting_row =
filtered_list.len().max(visible_term_rows) - visible_term_rows;
} else if sel == starting_row {
starting_row -= 1;
}
if sel == !0 {
sel = filtered_list.len() - 1;
} else {
sel = ((sel as i64 - 1 + filtered_list.len() as i64)
% (filtered_list.len() as i64)) as usize;
}
term.flush()?;
}
Key::ArrowDown | Key::Tab if !filtered_list.is_empty() => {
if sel == !0 {
sel = 0;
} else {
sel = (sel as u64 + 1).rem(filtered_list.len() as u64) as usize;
}
if sel == visible_term_rows + starting_row {
starting_row += 1;
} else if sel == 0 {
starting_row = 0;
}
term.flush()?;
}
Key::ArrowLeft if position > 0 => {
position -= 1;
term.flush()?;
}
Key::ArrowRight if position < search_term.len() => {
position += 1;
term.flush()?;
}
Key::Enter if !filtered_list.is_empty() => {
if self.clear {
render.clear()?;
}
if self.report {
render
.input_prompt_selection(self.prompt.as_str(), filtered_list[sel].0)?;
}
let sel_string = filtered_list[sel].0;
let sel_string_pos_in_items =
self.items.iter().position(|item| item.eq(sel_string));
term.show_cursor()?;
return Ok(sel_string_pos_in_items);
}
Key::Backspace if position > 0 => {
position -= 1;
search_term.remove(position);
term.flush()?;
}
Key::Char(chr) if !chr.is_ascii_control() => {
search_term.insert(position, chr);
position += 1;
term.flush()?;
sel = 0;
starting_row = 0;
}
_ => {}
}
render.clear_preserve_prompt(&size_vec)?;
}
}
}
impl<'a> FuzzySelect<'a> {
pub fn with_theme(theme: &'a dyn Theme) -> Self {
Self {
default: !0,
items: vec![],
prompt: "".into(),
report: true,
clear: true,
highlight_matches: true,
theme,
}
}
}