julia in comint is not respecting TERM=dumb? In inferior julia,
TERM=vt50 instead
reddit / emacs

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1nc0ns1st3nt · 2022-12-08 15:56

I was investigating why inferior julia is showing no prompt at all.
My investigation leads to me submit this issue:
https://github.com/JuliaLang/julia/issues/47837.

The solution is to set TERM = dumb, however, I have used `setenv`
`process-environment` to set TERM to dumb, still inside the inferior
julia, `ENV["TERM"]` is `vt50`.

Opening a terminal and type `TERM=linux julia`, this change is
reflected inside the process, i.e. `ENV["TERM"]` is `linux`.

Is this a case of processes started with comint not respecting TERM
environmental variable??

I am confused about this behaviour.

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ieure · 2022-12-08 16:36

The environment of a child process is inherited from the parent
process *at the time the process is started.*  You have to set `TERM`
before starting Julia, using `process-environment`.

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1nc0ns1st3nt · 2022-12-08 16:50

The bizarre things is `TERM=dumb` is in `process-environment` before
starting julia, yet inside julia `TERM` is `vt50`.

This is beyond reasons and logic at this point.

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1nc0ns1st3nt · 2022-12-09 01:41

The culprit is `comint-terminfo-terminal`, setting that to `dumb`
fixes the issue. See my comment here for a bit more information:
https://github.com/JuliaEditorSupport/julia-
emacs/issues/144#issuecomment-1343722278

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1nc0ns1st3nt · 2022-12-09 01:43

Hey, I just figured that it was `comint-terminfo-terminal`, its `vt50`
and that overrides the emacs `TERM` environmental variable setting

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7890yuiop · 2022-12-09 11:55

startup.el sets `TERM` to `dumb` because that's the sane default for
inferior processes started by Emacs.