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extern crate termion;
use termion::event::Key;
use termion::input::TermRead;
use termion::raw::IntoRawMode;
use std::io::{Write, stdout, stdin};
fn rainbow<W: Write>(stdout: &mut W, blue: u8) {
write!(stdout,
"{}{}",
termion::cursor::Goto(1, 1),
termion::clear::All)
.unwrap();
for red in 0..32 {
let red = red * 8;
for green in 0..64 {
let green = green * 4;
write!(stdout,
"{} ",
termion::color::Bg(termion::color::Rgb(red, green, blue)))
.unwrap();
}
write!(stdout, "\n\r").unwrap();
}
writeln!(stdout, "{}b = {}", termion::style::Reset, blue).unwrap();
}
fn main() {
let stdin = stdin();
let mut stdout = stdout().into_raw_mode().unwrap();
writeln!(stdout,
"{}{}{}Use the up/down arrow keys to change the blue in the rainbow.",
termion::clear::All,
termion::cursor::Goto(1, 1),
termion::cursor::Hide)
.unwrap();
let mut blue = 172u8;
for c in stdin.keys() {
match c.unwrap() {
Key::Up => {
blue = blue.saturating_add(4);
rainbow(&mut stdout, blue);
}
Key::Down => {
blue = blue.saturating_sub(4);
rainbow(&mut stdout, blue);
}
Key::Char('q') => break,
_ => {}
}
stdout.flush().unwrap();
}
write!(stdout, "{}", termion::cursor::Show).unwrap();
}
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