Handle "untitled" files in Neovim #15392
Description
Currently, the language server crashes with the following panic:
0.000076625s INFO main ruff_server::server: No workspace settings found for file:///Users/dhruv/playground/ruff, using default settings
0.016819875s DEBUG ThreadId(15) ruff_server::session::index::ruff_settings: Ignored path via `exclude`: /Users/dhruv/playground/ruff/.vscode
0.025011584s INFO main ruff_server::session::index: Registering workspace: /Users/dhruv/playground/ruff
0.025738917s TRACE ruff:main notification{method="textDocument/didOpen"}: ruff_server::server::api: enter
0.026116917s TRACE ruff:worker:0 request{id=2 method="textDocument/diagnostic"}: ruff_server::server::api: enter
0.026236834s DEBUG ruff:worker:0 request{id=2 method="textDocument/diagnostic"}: ruff_server::resolve: Included path via `include`: /Users/dhruv/playground/ruff/type_inference/definition_vs_declaration.py
0.027171209s INFO ruff:main ruff_server::server: Configuration file watcher successfully registered
24.044284625s TRACE ruff:main notification{method="workspace/didChangeWorkspaceFolders"}: ruff_server::server::api: enter
24.044426375s ERROR ruff:main notification{method="workspace/didChangeWorkspaceFolders"}: ruff_server::server::api: An error occurred while running workspace/didChangeWorkspaceFolders: Failed to convert workspace URL to file path: file://./
24.044570667s TRACE ruff:main notification{method="textDocument/didOpen"}: ruff_server::server::api: enter
24.100126375s WARN ruff:main ruff_server::session::index: No settings available for file:/// - falling back to default settings
24.101414459s TRACE ruff:worker:2 request{id=3 method="textDocument/diagnostic"}: ruff_server::server::api: enter
24.101510542s DEBUG ruff:worker:2 request{id=3 method="textDocument/diagnostic"}: ruff_server::resolve: Included path via Python language ID: /
24.101617792s ERROR ruff:worker:2 request{id=3 method="textDocument/diagnostic"}: ruff_server::server: panicked at crates/ruff_server/src/lint.rs:89:18:
a path to a document should have a parent path
At 24.044284625s, the unnamed buffer has been assigned the filetype as Python in Neovim which triggers the following notifications from the client to the server:
didChangeWorkspaceFolders:
[DEBUG][2025-01-10 13:32:36] .../vim/lsp/rpc.lua:286 "rpc.send" {
jsonrpc = "2.0",
method = "workspace/didChangeWorkspaceFolders",
params = {
event = {
added = { {
name = ".",
uri = "file://."
} },
removed = {}
}
}
}
which fails with the following error:
24.044426375s ERROR ruff:main notification{method="workspace/didChangeWorkspaceFolders"}: ruff_server::server::api: An error occurred while running workspace/didChangeWorkspaceFolders: Failed to convert workspace URL to file path: file://./
textDocument/didOpen:
[DEBUG][2025-01-10 13:32:36] .../vim/lsp/rpc.lua:286 "rpc.send" {
jsonrpc = "2.0",
method = "textDocument/didOpen",
params = {
textDocument = {
languageId = "python",
text = "\n",
uri = "file://",
version = 0
}
}
}
textDocument/diagnostic:
[DEBUG][2025-01-10 13:32:36] .../vim/lsp/rpc.lua:286 "rpc.send" {
id = 2,
jsonrpc = "2.0",
method = "textDocument/diagnostic",
params = {
range = {
["end"] = {
character = 0,
line = 1
},
start = {
character = 0,
line = 0
}
},
textDocument = {
uri = "file://"
}
}
}