86 lines
2.4 KiB
Rust
86 lines
2.4 KiB
Rust
use std::io::Write;
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use std::{io, mem};
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use crossterm::cursor::MoveTo;
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use crossterm::style::{PrintStyledContent, StyledContent};
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use crossterm::terminal::{Clear, ClearType, EnterAlternateScreen, LeaveAlternateScreen};
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use crossterm::{ExecutableCommand, QueueableCommand};
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use crate::buffer::{Buffer, Size};
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pub struct Terminal {
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out: Box<dyn Write>,
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/// Currently visible on screen.
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prev_buffer: Buffer,
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/// Buffer to render to.
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curr_buffer: Buffer,
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/// When the screen is updated next, it must be cleared and redrawn fully
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/// instead of performing an incremental update.
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full_redraw: bool,
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}
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impl Drop for Terminal {
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fn drop(&mut self) {
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let _ = self.out.execute(LeaveAlternateScreen);
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let _ = crossterm::terminal::disable_raw_mode();
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}
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}
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impl Terminal {
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pub fn new(out: Box<dyn Write>) -> io::Result<Self> {
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let mut result = Self {
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out,
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prev_buffer: Buffer::new(),
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curr_buffer: Buffer::new(),
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full_redraw: true,
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};
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crossterm::terminal::enable_raw_mode()?;
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result.out.execute(EnterAlternateScreen)?;
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Ok(result)
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}
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pub fn buffer(&mut self) -> &mut Buffer {
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&mut self.curr_buffer
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}
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pub fn autoresize(&mut self) -> io::Result<()> {
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let (width, height) = crossterm::terminal::size()?;
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let size = Size { width, height };
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if size != self.curr_buffer.size() {
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self.prev_buffer.resize(size);
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self.curr_buffer.resize(size);
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self.full_redraw = true;
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}
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Ok(())
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}
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/// Display the contents of the buffer on the screen and prepare rendering
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/// the next frame.
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pub fn present(&mut self) -> io::Result<()> {
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if self.full_redraw {
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io::stdout().queue(Clear(ClearType::All))?;
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self.prev_buffer.reset();
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self.full_redraw = false;
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}
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self.draw_differences()?;
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self.out.flush()?;
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mem::swap(&mut self.prev_buffer, &mut self.curr_buffer);
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Ok(())
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}
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fn draw_differences(&mut self) -> io::Result<()> {
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// TODO Only draw the differences
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for (x, y, cell) in self.curr_buffer.cells() {
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let content = StyledContent::new(cell.style, &cell.content as &str);
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self.out
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.queue(MoveTo(x, y))?
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.queue(PrintStyledContent(content))?;
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}
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Ok(())
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}
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}
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