Re: bash source code block: problem after ssh commands

[Max Nikulin <manikulin@gmail.com>]

On 30/06/2024 18:06, Ihor Radchenko wrote:
> Max Nikulin writes:
> 
>> https://debbugs.gnu.org/67259
>>
>> Notice that the report is for *interactive* sessions. Org babel sessions
>> are not so interactive. They are to maintain state, not to interact with
>> users directly...
> 
> You are not right. We have legitimate cases when people can switch to
> session buffer, enter commands there, switch back to Org buffers,
> send code blocks to the same session, and so on.

Timings are still important part of interactive sessions and ob-shell 
has no chance to simulate them having just block of commands.

By the way, dash does not support bracketed paste since it is a minimal 
shell mainly for interpreting scripts. So result of pasting several 
commands at once is different from bash. I do not think it is related to 
dash bugs.

>> Possible voluntary decision is to consider every session source block
>> similar to "C-x C-e" in bash prompt, so nothing should become implicit
>> stdin of commands. Content of a source block should be saved into a
>> temporary file then "source /path/to/block_content" command should be
>> send to the session buffer. Likely command depends on shell.
> 
> This may work, but we should at least echo the original commands into
> session buffer, because users may want to examine them.

I have no idea which way bash or readline function 
edit-and-execute-command is implemented, but commands are echoed when 
editor is closed. Anyway it may greatly vary across shells.

I am unaware if it is possible to detect if bracketed paste is 
implemented and to send input as bracketed paste. Perhaps some escape 
sequences are involved. ob-shell might offer variants for sessions: dumb 
stdin, source a temporary file, or bracketed paste. Anything besides 
stdin (with its confusing differences from interactive sessions) is 
almost certainly requires shell-specific code. And `shell' is likely not 
suitable with its TERM=dumb.