this post was submitted on 20 Oct 2023
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dape.el: DAP client that does not rely on LSP-mode (alien.top)
submitted 1 year ago by FreeAd7233@alien.top to c/emacs@communick.news
28 comments fedilink hide all child comments
 

https://github.com/svaante/dape#

Given that eglot has been part of the core emacs, I believe this is a long lasting wish for a lot of emacsers that has finally been fulfilled. (a stand alone DAP implementation that does not rely on LSP-mode)

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[–] JDRiverRun@alien.top 1 points 1 year ago (3 children)

How would you attach a DAP python debugger to a running instance of (i)Python? Is there some import debugpy; debugpy.start() command or similar?

[–] svaante@alien.top 1 points 1 year ago (1 children)

There is

In python:

import debugpy
debugpy.listen(5678) # debugpy will open 5678

Then add the following configuration to dape

(add-to-list 'dape-configs
`(debugpy-attach
  modes ()
  host "localhost"
  port ,(lambda () (read-number "Port: "))
  :type "debugpy"
  :request "attach"))

Supposedly there is a way to attach by pid with python3 -m debugpy --listen localhost:5678 --pid 12345, but that failed, both on osx and linux.

[–] FreeAd7233@alien.top 1 points 1 year ago (1 children)

Yes, I also tried to use --pid to attach to a python process, and failed too.

[–] JDRiverRun@alien.top 1 points 1 year ago

Did you either succeed with debugpy.listen()? Is that suitable to call interactively then quit (like iPDB)?

[–] FreeAd7233@alien.top 1 points 1 year ago (1 children)

I believe this is out of the scope of the DAP protocol, I believe even VSCode cannot do it based on my understanding.

If you want to debug a running session, just use ipdb or pdb.

[–] mickeyp@alien.top 2 points 1 year ago (2 children)

No it isn't. DAP can definitely do this. It can even attach to a PID.

This is what I complained about it in my post: I could not get dape to work with this.

[–] FreeAd7233@alien.top 1 points 1 year ago (1 children)

I see, thanks for correcting me.

I see that this post https://github.com/Microsoft/vscode-python/issues/1078 suggested that debugpy can already attach to a local Python process.

[–] JDRiverRun@alien.top 1 points 1 year ago

Seems like in-process debuggers like iPDB are far more practical for interactive debugging of long running shells.

[–] FreeAd7233@alien.top 1 points 1 year ago

I see, thanks for correcting me.

I see that this post https://github.com/Microsoft/vscode-python/issues/1078 suggested that debugpy can already attach to a local Python process.