Re: A one line change I wish to see by default.

[Antonio Diaz Diaz]

Martin Guy wrote:
> On 06/11/2023, Antonio Diaz Diaz<antonio@gnu.org>  wrote:
> > Zeke Williams wrote:
> > > Would there be any additional gotchas (Other than it won't work with
> > > non-ANSI terminals) to using "\x1B[A\r\x1B[J" to work around so to
> > > speak not using ncurses
>
> > So I guess the proposed "\x1B[A\r\x1B[J" may work for ed.
>
> Is \r enough to obtain the effect? It would be a bit more... purist,
> but I wouldn't encode ANSI escape sequences into ed if it can be avoided.

Sadly \r seems to be the only avoidable part of the sequence above (because 
the cursor is already at the beginning of the line when the ANSI sequence 
would be sent to the terminal).

The final part "\x1B[J" (erase up to the end of the page) or "\x1B[K" (erase 
up to the end of the line) could also be avoided if we limit the sending of 
the escape sequence to the null command without an address (i.e., a single 
newline), because in this case the line above the cursor would be already blank.

In any case, even if this feature is implemented, it would be only activated 
with a command-line option (preferably more informative than '--ex-emulation').

Best regards,
Antonio.