/
fuzzy_select.rs
247 lines (218 loc) · 7.91 KB
/
fuzzy_select.rs
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use crate::theme::{SimpleTheme, TermThemeRenderer, Theme};
use console::{Key, Term};
use fuzzy_matcher::FuzzyMatcher;
use std::{io, ops::Rem};
/// Renders a selection menu that user can fuzzy match to reduce set.
///
/// User can use fuzzy search to limit selectable items.
/// Interaction returns index of an item selected in the order they appear in `item` invocation or `items` slice.
///
/// ## Examples
///
/// ```rust,no_run
/// use dialoguer::{
/// FuzzySelect,
/// theme::ColorfulTheme
/// };
/// use console::Term;
///
/// fn main() -> std::io::Result<()> {
/// let items = vec!["Item 1", "item 2"];
/// let selection = FuzzySelect::with_theme(&ColorfulTheme::default())
/// .items(&items)
/// .default(0)
/// .interact_on_opt(&Term::stderr())?;
///
/// match selection {
/// Some(index) => println!("User selected item : {}", items[index]),
/// None => println!("User did not select anything")
/// }
///
/// Ok(())
/// }
/// ```
pub struct FuzzySelect<'a> {
default: usize,
items: Vec<String>,
prompt: String,
clear: bool,
theme: &'a dyn Theme,
}
impl Default for FuzzySelect<'static> {
fn default() -> Self {
Self::new()
}
}
impl FuzzySelect<'static> {
/// Creates the prompt with a specific text.
pub fn new() -> Self {
Self::with_theme(&SimpleTheme)
}
}
impl FuzzySelect<'_> {
/// Sets the clear behavior of the menu.
///
/// The default is to clear the menu.
pub fn clear(&mut self, val: bool) -> &mut Self {
self.clear = val;
self
}
/// Sets a default for the menu
pub fn default(&mut self, val: usize) -> &mut Self {
self.default = val;
self
}
/// Add a single item to the fuzzy selector.
pub fn item<T: ToString>(&mut self, item: T) -> &mut Self {
self.items.push(item.to_string());
self
}
/// Adds multiple items to the fuzzy selector.
pub fn items<T: ToString>(&mut self, items: &[T]) -> &mut Self {
for item in items {
self.items.push(item.to_string());
}
self
}
/// Prefaces the menu with a prompt.
///
/// When a prompt is set the system also prints out a confirmation after
/// the fuzzy selection.
pub fn with_prompt<S: Into<String>>(&mut self, prompt: S) -> &mut Self {
self.prompt = prompt.into();
self
}
/// Enables user interaction and returns the result.
///
/// The user can select the items using 'Enter' and the index of selected item will be returned.
/// The dialog is rendered on stderr.
/// Result contains `index` of selected item if user hit 'Enter'.
/// This unlike [interact_opt](#method.interact_opt) does not allow to quit with 'Esc' or 'q'.
#[inline]
pub fn interact(&self) -> io::Result<usize> {
self.interact_on(&Term::stderr())
}
/// Enables user interaction and returns the result.
///
/// The user can select the items using 'Enter' and the index of selected item will be returned.
/// The dialog is rendered on stderr.
/// Result contains `Some(index)` if user hit 'Enter' or `None` if user cancelled with 'Esc' or 'q'.
#[inline]
pub fn interact_opt(&self) -> io::Result<Option<usize>> {
self.interact_on_opt(&Term::stderr())
}
/// Like `interact` but allows a specific terminal to be set.
#[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"))
}
/// Like `interact` but allows a specific terminal to be set.
#[inline]
pub fn interact_on_opt(&self, term: &Term) -> io::Result<Option<usize>> {
self._interact_on(term, true)
}
/// Like `interact` but allows a specific terminal to be set.
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.clone());
}
// Fuzzy matcher
let matcher = fuzzy_matcher::skim::SkimMatcherV2::default();
term.hide_cursor()?;
loop {
render.clear()?;
render.fuzzy_select_prompt(self.prompt.as_str(), &search_term, position)?;
// Maps all items to a tuple of item and its match score.
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<_>>();
// Renders all matching items, from best match to worst.
filtered_list.sort_unstable_by(|(_, s1), (_, s2)| s2.cmp(&s1));
for (idx, (item, _)) in filtered_list.iter().enumerate() {
render.select_prompt_item(item, idx == sel)?;
term.flush()?;
}
match term.read_key()? {
Key::Escape if allow_quit => {
if self.clear {
term.clear_last_lines(filtered_list.len())?;
term.flush()?;
}
term.show_cursor()?;
return Ok(None);
}
Key::ArrowUp | Key::BackTab if filtered_list.len() > 0 => {
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.len() > 0 => {
if sel == !0 {
sel = 0;
} else {
sel = (sel as u64 + 1).rem(filtered_list.len() as u64) as usize;
}
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.len() > 0 => {
if self.clear {
render.clear()?;
}
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;
}
_ => {}
}
render.clear_preserve_prompt(&size_vec)?;
}
}
}
impl<'a> FuzzySelect<'a> {
/// Same as `new` but with a specific theme.
pub fn with_theme(theme: &'a dyn Theme) -> Self {
Self {
default: !0,
items: vec![],
prompt: "".into(),
clear: true,
theme,
}
}
}