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use std::io::{self, Stdout, Write};
use anyhow::Result;
use crossterm::{
cursor, queue, style,
terminal::{self, disable_raw_mode, enable_raw_mode, ClearType},
};
pub fn clear_screen(keep_lines: u16) -> Result<()> {
enable_raw_mode()?;
let mut stdout = io::stdout();
let ret = clear_screen_inner(&mut stdout, keep_lines);
// restore terminal
disable_raw_mode()?;
ret
}
fn clear_screen_inner(writer: &mut Stdout, keep_lines: u16) -> Result<()> {
let (_, h) = terminal::size()?;
queue!(
writer,
style::Print("\n".repeat((h - 2).into())),
terminal::ScrollUp(2),
cursor::MoveTo(0, 0),
terminal::Clear(ClearType::FromCursorDown),
terminal::ScrollUp(keep_lines),
)?;
writer.flush()?;
Ok(())
}
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