Working with remote files in EIN

[gzagatti]

I am working with remote files served by a Jupyter server using EIN. However, I am having trouble opening multiple python files from the same server.

My issue goes as following:

1. Assume my current working directory is /my/path
2. Connect to a jupyter server https://myserver.com using ein:notebooklist-open
3. Select a file to open. It looks like EIN modifies the buffer name according to a set of rules described here. The basic idea is that if the file in the server is located in remote-dir/path, the buffer is renamed to /my/path/'ein:https://myserver.com:remote-dir/path.
4. LSP will then ask about the root of the project. Since 'ein:https://myserver.com:remote-dir/ should not be mirrored in the local file system I manually select the project root with I and set it to /my/path. LSP then loads without error and LSP does not interfere with the write hook that is implemented by EIN on the link pointed in (2).
5. Now, I want to open a second file remote-dir/another-path. Now, LSP tries to save the file to /my/path/'ein:https://myserver.com:remote-dir/another-path. Every time I try to save the file, it keeps complaining that the path /my/path/'ein:https://myserver.com:remote-dir/another-path does not exist, which is true and intentional. If I say I do not want to write the file, I get an error message error in process sentinel: Canceled.

My current working solution which is far from ideal consists of the following:

1. When I try to open a second file, I refuse to save the file in /my/path/'ein:https://myserver.com:remote-dir/another-path
2. Then, I manually add the hook (add-hook 'write-contents-functions 'ein:content-file-save)
3. The LSP server gets activated on the second file using the LSP server of the first file since they now share the same root.
4. Save now works as expected, sending the contents to the jupyter server.

How can I modify the behavior described above such that the following happens:

1. When opening a buffer that has the ein name pattern, LSP sets the working directory to the current working directory /my/path.
2. It lets EIN complete its job and add the required hook.

Any help would be appreciated. Based on this FAQ, my intuition is that I should modify lsp via advice-add but I am not sure how to do that.

[yyoncho]

Maybe the first thing to change is lsp-auto-touch-files? We automatically try to save the file on the disk(some language servers tend to fail if the file is not on the disk).

[gzagatti]

Thanks! That's what I needed. I'm glad the solution was so simple.