fix(ruby_lsp): prevent duplicate clients on second buffer #4132
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justinmk
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Oct 17, 2025
justinmk
reviewed
Oct 17, 2025
lsp/ruby_lsp.lua
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| return client.config.cmd_cwd == config.cmd_cwd | ||
| local client_cwd = client.config.cmd_cwd or client.root_dir | ||
| local config_cwd = config.cmd_cwd or config.root_dir | ||
| return client_cwd == config_cwd |
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why is this thing forcing root_dir to always be equal to CWD?
i would think this whole reuse_client can be dropped, assuming the other comment is addressed.
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The custom reuse_client was added in commit 903045b for monorepo support, but I don't fully understand why cmd_cwd comparison is necessary.
I don't have any monorepos that use ruby. This worked for me and i think it doesn't break the original monorepo support.
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Updated the fix based on feedback:
This approach:
The commit has been squashed and the message updated. |
Problem: When opening multiple Ruby buffers, a second LSP client is spawned instead of reusing the first client, even though they share the same root directory. Root cause: The reuse_client function sets cmd_cwd as a side effect during reuse checks. This means the first client is created without cmd_cwd set, causing the reuse check to fail for the second buffer. Solution: Use before_init to ensure cmd_cwd is set for every client. Remove the custom reuse_client function to use Neovim's default reuse logic (compare name + root_dir). Testing: Tested with Neovim 0.11.4 by opening 3 Ruby files. All buffers now correctly reuse the first client.
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justinmk
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Oct 18, 2025
| }, | ||
| reuse_client = function(client, config) | ||
| before_init = function(_, config) | ||
| config.cmd_cwd = config.root_dir |
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sadly, before_init happens after the cmd is invoked, which means setting the cmd_cwd won't have the effect that was intended here.
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Problem: When opening multiple Ruby buffers, a second LSP client is spawned instead of reusing the first client, even though they share the same root directory.
Root cause: The
reuse_clientfunction setscmd_cwdas a side effect during reuse checks. This means the first client is created withoutcmd_cwdset, causing the reuse check to fail for the second buffer.Solution: Use
before_initto ensurecmd_cwdis set for every client before initialization. Remove the customreuse_clientfunction to use Neovim's default reuse logic (compare name + root_dir).Testing: Tested with Neovim 0.11.4 by opening 3 Ruby files. All buffers now correctly reuse the first client.
Note:
lsp/ast_grep.luahas the identical pattern and likely has the same issue.