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fix(cli): Make --watcher CLEAR_SCREEN clear scrollback buffer as well as visible screen (#25997)

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The --watch option should clear the screen scrollback buffer as well as
the screen itself.

On Ubuntu (22.04 Jammy) the 'clear' command generates
"\x1B[H\x1B[2J\x1B[3J"; that is:
- \E[H  - cursor home
- \E[2J - clear entire screen
- \E[3J - clear entire screen & scrollback buffer.

By contrast, Deno defined CLEAR_SCREEN as "\x1B[2J\x1B[1;1H", which
fails to clear the scrollback buffer.

The "\E[H\E[2J\E[3J" sequence works on MacOS (Sonoma) (using printf);
I'm not able to test on Windows.

Closes https://github.com/denoland/deno/issues/26514
This commit is contained in:
Chris Veness 2024-10-26 23:12:40 +01:00 committed by GitHub
parent 793b155cd3
commit 75f00eecb0
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2
cli/util/file_watcher.rs
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@ -30,7 +30,7 @@ use tokio::sync::mpsc;
use tokio::sync::mpsc::UnboundedReceiver;
use tokio::time::sleep;
const CLEAR_SCREEN: &str = "\x1B[2J\x1B[1;1H";
const CLEAR_SCREEN: &str = "\x1B[H\x1B[2J\x1B[3J";
const DEBOUNCE_INTERVAL: Duration = Duration::from_millis(200);
struct DebouncedReceiver {