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Re: Terminal emulator in Windows

From: Jim Porter
Subject: Re: Terminal emulator in Windows
Date: Wed, 11 Jan 2023 11:52:03 -0800

On 1/11/2023 10:26 AM, Akib Azmain Turja wrote:
Jim Porter <jporterbugs@gmail.com> writes:

On 1/11/2023 1:35 AM, Akib Azmain Turja wrote:
In general, is it possible to implement Windows terminal emulation?

Do you mean "emulating cmd.exe" or "emulating a terminal and running
that emulator on MS Windows"? The former might be trickier, and I

I started the thread, and even I don't know.  But I guess the latter.
For more information, you may check the Eat issue 35 on Codeberg:

In some ways this issue actually sounds more like the former. It sounds like the user wants something like ConEmu[1] in Emacs. ConEmu's implementation seems pretty hacky to me, since it relies on an invisible Windows Console window[2].

On the other hand, there's the new-ish MS Windows API called ConPTY (as the name implies, it gives you a pseudoterminal). This would give us similar benefits compared to what ConEmu does, but using an explicitly-supported API for it. This would be nice, since then Emacs could just use pseudoterminals everywhere, which I think is what we want. Unfortunately, it seems that this API isn't suitable for Emacs, as discussed here[3] by Eli.

haven't really looked into how you'd do that. However, the latter
might just mean handling VT100 terminal sequences, which I don't think
would require knowing about any Windows-specific features/APIs.

But somehow we need to tell the program what escape sequences to send,
don't we?

From this discussion[4], it's the *program* that decides to opt in to sending VT100 sequences to a Windows console. That is, if I wrote a cross-platform program that uses VT100 sequences, I'd call 'SetConsoleMode' with 'ENABLE_VIRTUAL_TERMINAL_PROCESSING' in my MS Windows port. Maybe Emacs could piggyback off of that.

I don't know if this would help solve the issue in the bug you linked, but maybe something like this would work for handling VT100 sequences in Eshell via 'eat-eshell-mode', or when running *nix programs remotely through Tramp.

[1] https://conemu.github.io/

[2] https://conemu.github.io/en/RealConsole.html

[3] https://github.com/microsoft/terminal/issues/9174

[4] https://news.ycombinator.com/item?id=25866634

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