60 lines
2 KiB
Rust
60 lines
2 KiB
Rust
use crossterm::event::Event;
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use crossterm::style::ContentStyle;
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use toss::frame::{Frame, Pos};
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use toss::terminal::{Redraw, Terminal};
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fn draw(f: &mut Frame) {
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let text = concat!(
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"This is a short paragraph in order to demonstrate unicode-aware word wrapping. ",
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"Resize your terminal to different widths to try it out. ",
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"After this sentence come two newlines, so it should always break here.\n",
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"\n",
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"Since the wrapping algorithm is aware of the Unicode Standard Annex #14, ",
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"it understands things like non-breaking spaces and word joiners: ",
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"This\u{00a0}sentence\u{00a0}is\u{00a0}separated\u{00a0}by\u{00a0}non-\u{2060}breaking\u{00a0}spaces.\n",
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"\n",
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"It can also properly handle wide graphemes (like emoji 🤔), ",
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"including ones usually displayed incorrectly by terminal emulators, like 👩🔬 (a female scientist emoji).",
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);
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// TODO Actually use nbsp
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let breaks = f.wrap(text, f.size().width.into());
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let lines = toss::split_at_indices(text, &breaks);
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for (i, line) in lines.iter().enumerate() {
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f.write(
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Pos::new(0, i as i32),
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line.trim_end(),
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ContentStyle::default(),
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);
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}
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}
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fn render_frame(term: &mut Terminal) {
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loop {
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// Must be called before rendering, otherwise the terminal has out-of-date
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// size information and will present garbage.
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term.autoresize().unwrap();
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draw(term.frame());
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if term.present().unwrap() == Redraw::NotRequired {
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break;
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}
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}
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}
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fn main() {
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// Automatically enters alternate screen and enables raw mode
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let mut term = Terminal::new().unwrap();
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loop {
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// Render and display a frame. A full frame is displayed on the terminal
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// once this function exits.
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render_frame(&mut term);
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// Exit if the user presses any buttons
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if !matches!(crossterm::event::read().unwrap(), Event::Resize(_, _)) {
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break;
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}
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}
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}
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