ruff server has delay when no local config.

[Adam K.]

I initially posted this in #11258 as an issue I noticed but I figured it was going to be fixed with the associated PR(#11266). However with ruff 0.4.4 I noticed that the problem described below still persists. I am going to attach the LSP error from neovim, it appears to have a lot of repeating messages so I apologize.

[ERROR][2024-05-10 21:40:46] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	"┐ruff_server::server::api::notifications::did_open::run{file=file:///C:/Users/ARK010/test.py}\n┘\n  39.925874s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n"
[ERROR][2024-05-10 21:40:46] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	"┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n  39.926023s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n  39.926098s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n  39.926179s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n  39.926229s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n  39.926298s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n  39.926323s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n  39.926377s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n┐ruff_server::server::api::notifications::cancel::run{}\n┘\n  39.926542s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n┐ruff_server::server::api::notifications::cancel::run{}\n┘\n┐ruff_formatter::printer::Printer::print{}\n┘\n"
[ERROR][2024-05-10 21:40:46] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	"  39.927576s INFO ruff_server::server Configuration file watcher successfully registered\n┐ruff_formatter::printer::Printer::print{}\n┘\n"

I am also going to copy and paste the lsp log from ~2 minutes later when I tried again in the same file (without closing it, just waiting ~ 2 minutes, and it successfully formatted.

[ERROR][2024-05-10 21:43:23] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	" 196.088724s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n┐ruff_formatter::printer::Printer::print{}\n┘\n"
[ERROR][2024-05-10 21:43:23] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	"┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n"
[ERROR][2024-05-10 21:43:23] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	"┐ruff_server::server::api::notifications::did_change::run{file=file:///C:/Users/ARK010/test.py}\n┘\n"
[ERROR][2024-05-10 21:43:23] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	" 196.157007s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n"
[ERROR][2024-05-10 21:43:23] .../vim/lsp/rpc.lua:770	"rpc"	"C:\\Users\\ARK010\\AppData\\Local\\nvim-data\\mason\\bin\\ruff.CMD"	"stderr"	" 196.160130s INFO ruff_server::session::workspace::ruff_settings No Ruff settings file found for C:\\Users\\ARK010\\test.py; falling back to default configuration\n"

@snowsignal Does this PR solve this scenario:
Windows 10
Neovim Nightly Latest
Ruff 0.4.3
Python 3.12.3

• Have global config in ~/.config/ruff/pyproject.toml
• Create "test.py" in ~/ (not a project/workspace and there is no present .toml config)
• Create a test function

def this_function(y: int, x: int) -> int:


    """ This is an example function """


    word_fx: int = 0
    return y + x + word_fx

• Notice the excessive space between function definition and doc strings...
• Attempt to save (my neovim config would use conform.nvim to call ruff to format on save)
• 2-4 second hang...ruff errors and times out (  Warn 8:53:50 PM notify.warn [LSP][ruff] timeout)
• Curve ball...wait a minute or two to type this example/report up...go to save and it formats successfully this time.
• This does not occur in projects with a local .toml file...
• I am assuming this is because it takes time to look for the global config and it doesn't merge with the editor config without the local config?

Originally posted by @akthe-at in #11258 (comment)

[Adam K.]

@snowsignal I have more information, I think this revelation might make you want to close this issue?

I had a hunch and moved the simple .py featured above from the location of "~" or C:/Users/FooBar/ to a much more nested directory like ~/config/test/ and this problem no longer persisted.

It appears the issue is that formatting with ruff times out when the file is in the ~/ directory because it is busy parsing all of the sub-directories?

[Daniel Hollas]

I've ran into this as well, it's very confusing. The ruff Lsp would be delayed on startup if a modified python file is in a top level folder without a config file (i.e. outside of project directory). I noticed in Lsp logs that ruff is walking all subdirectories looking for a config file.

I don't understand why ruff should be looking for a config file in subdirectories? Shouldn't it be the other way around i.e it should walk the parent directories to look for the config. This seems like a bug to me.

Cc @dhruvmanila

[Micha Reiser]

I think it has to scan sub folders in case you have a configuration e.g. only in the src directory. We then want to apply that configuration to src only, but fall back to the default configuration for everything else.

I wonder if we ignore directories like .git etc when walking. If not, then that could add a significant overhead.

[Charlie Marsh]

@MichaReiser - We ignore them now. We didn't in the initial beta release.

[Daniel Hollas]

I think it has to scan sub folders in case you have a configuration e.g. only in the src directory. We then want to apply that configuration to src only, but fall back to the default configuration for everything else.

I wonder if we ignore directories like .git etc when walking. If not, then that could add a significant overhead.

I am confused. Surely if I am editing a file from outside the src/ directory, then even if you find a config there it shouldn't apply to the file I am editing, right?

Right now if I am editing a python file in me $HOME, it seems to walk the entirety of my HOME which seems suboptimal:-)