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use rustyline::completion::{Candidate, Completer, FilenameCompleter, Pair};
use rustyline::line_buffer;
use termion::event::{Event, Key};
use tui::layout::Rect;
use tui::widgets::Clear;
use unicode_width::UnicodeWidthStr;
use crate::context::AppContext;
use crate::event::AppEvent;
use crate::ui::views::TuiView;
use crate::ui::widgets::{TuiMenu, TuiMultilineText};
use crate::ui::TuiBackend;
use crate::util::input;
struct CompletionTracker {
pub index: usize,
pub pos: usize,
pub _original: String,
pub candidates: Vec<Pair>,
}
impl CompletionTracker {
pub fn new(pos: usize, candidates: Vec<Pair>, _original: String) -> Self {
CompletionTracker {
index: 0,
pos,
_original,
candidates,
}
}
}
pub struct CursorInfo {
pub x: usize,
pub y: usize,
}
pub struct TuiTextField<'a> {
_prompt: &'a str,
_prefix: &'a str,
_suffix: &'a str,
_menu_items: Vec<&'a str>,
}
impl<'a> TuiTextField<'a> {
pub fn menu_items<I>(&mut self, items: I) -> &mut Self
where
I: Iterator<Item = &'a str>,
{
self._menu_items = items.collect();
self
}
pub fn prompt(&mut self, prompt: &'a str) -> &mut Self {
self._prompt = prompt;
self
}
pub fn prefix(&mut self, prefix: &'a str) -> &mut Self {
self._prefix = prefix;
self
}
pub fn suffix(&mut self, suffix: &'a str) -> &mut Self {
self._suffix = suffix;
self
}
pub fn get_input(
&mut self,
backend: &mut TuiBackend,
context: &mut AppContext,
) -> Option<String> {
let mut line_buffer = line_buffer::LineBuffer::with_capacity(255);
let completer = FilenameCompleter::new();
let mut completion_tracker: Option<CompletionTracker> = None;
let char_idx = self._prefix.chars().map(|c| c.len_utf8()).sum();
line_buffer.insert_str(0, self._suffix);
line_buffer.insert_str(0, self._prefix);
line_buffer.set_pos(char_idx);
let terminal = backend.terminal_mut();
let _ = terminal.show_cursor();
let mut curr_history_index = context.commandline_context_ref().history_ref().len();
loop {
terminal
.draw(|frame| {
let area: Rect = frame.size();
if area.height == 0 {
return;
}
{
let mut view = TuiView::new(context);
view.show_bottom_status = false;
frame.render_widget(view, area);
}
let area_width = area.width as usize;
let buffer_str = line_buffer.as_str();
let cursor_xpos = line_buffer.pos();
let line_str = format!("{}{}", self._prompt, buffer_str);
let multiline = TuiMultilineText::new(line_str.as_str(), area_width);
let multiline_height = multiline.height();
// render menu
{
let menu_widget = TuiMenu::new(self._menu_items.as_slice());
let menu_len = menu_widget.len();
let menu_y = if menu_len + 1 > area.height as usize {
0
} else {
(area.height as usize - menu_len - 1) as u16
};
let menu_rect = Rect {
x: 0,
y: menu_y - multiline_height as u16,
width: area.width,
height: menu_len as u16 + 1,
};
frame.render_widget(Clear, menu_rect);
frame.render_widget(menu_widget, menu_rect);
}
let multiline_rect = Rect {
x: 0,
y: area.height - multiline_height as u16,
width: area.width,
height: multiline_height as u16,
};
let mut cursor_info = CursorInfo {
x: 0,
y: area.height as usize,
};
// get cursor render position
let cursor_prefix_width =
buffer_str[0..cursor_xpos].width() + self._prompt.len();
let y_offset = cursor_prefix_width / area_width;
cursor_info.y = area.height as usize - multiline_height + y_offset;
cursor_info.x = cursor_prefix_width % area_width + y_offset;
// render multiline textfield
frame.render_widget(Clear, multiline_rect);
frame.render_widget(multiline, multiline_rect);
// render cursor
frame.set_cursor(cursor_info.x as u16, cursor_info.y as u16);
})
.unwrap();
if let Ok(event) = context.poll_event() {
match event {
AppEvent::Termion(Event::Key(key)) => {
match key {
Key::Backspace => {
if line_buffer.backspace(1) {
completion_tracker.take();
}
}
Key::Left => {
if line_buffer.move_backward(1) {
completion_tracker.take();
}
}
Key::Right => {
if line_buffer.move_forward(1) {
completion_tracker.take();
}
}
Key::Delete => {
if line_buffer.delete(1).is_some() {
completion_tracker.take();
}
}
Key::Home => {
line_buffer.move_home();
completion_tracker.take();
}
Key::End => {
line_buffer.move_end();
completion_tracker.take();
}
Key::Up => {
curr_history_index = if curr_history_index > 0 {
curr_history_index - 1
} else {
0
};
line_buffer.move_home();
line_buffer.kill_line();
if let Some(s) = context
.commandline_context_ref()
.history_ref()
.get(curr_history_index)
{
line_buffer.insert_str(0, s);
}
}
Key::Down => {
curr_history_index = if curr_history_index
< context.commandline_context_ref().history_ref().len()
{
curr_history_index + 1
} else {
curr_history_index
};
line_buffer.move_home();
line_buffer.kill_line();
if let Some(s) = context
.commandline_context_ref()
.history_ref()
.get(curr_history_index)
{
line_buffer.insert_str(0, s);
}
}
Key::Esc => {
let _ = terminal.hide_cursor();
return None;
}
Key::Char('\t') => {
if completion_tracker.is_none() {
let res = completer
.complete_path(line_buffer.as_str(), line_buffer.pos());
if let Ok((pos, mut candidates)) = res {
candidates.sort_by(|x, y| {
x.display()
.partial_cmp(y.display())
.unwrap_or(std::cmp::Ordering::Less)
});
let ct = CompletionTracker::new(
pos,
candidates,
String::from(line_buffer.as_str()),
);
completion_tracker = Some(ct);
}
}
if let Some(ref mut s) = completion_tracker {
if s.index < s.candidates.len() {
let candidate = &s.candidates[s.index];
completer.update(
&mut line_buffer,
s.pos,
candidate.display(),
);
s.index += 1;
}
}
}
Key::Char('\n') => {
break;
}
Key::Char(c) => {
if line_buffer.insert(c, 1).is_some() {
completion_tracker.take();
}
}
_ => {}
}
context.flush_event();
}
AppEvent::Termion(_) => {
context.flush_event();
}
event => input::process_noninteractive(event, context),
};
}
}
let _ = terminal.hide_cursor();
if line_buffer.as_str().is_empty() {
None
} else {
let input_string = line_buffer.to_string();
Some(input_string)
}
}
}
impl<'a> std::default::Default for TuiTextField<'a> {
fn default() -> Self {
Self {
_prompt: "",
_prefix: "",
_suffix: "",
_menu_items: vec![],
}
}
}