How can I ignore "~/.cargo/registry/src..." in "vim.diagnostic.setqflist()"?

[chardskarth]

Triggering this vim.diagnostic.setqflist() shows all diagnostics including directories/source files that are not inside my source directory... is there a way to exclude these?

---

I am using rustaceanvim and have this config:

vim.g.rustaceanvim = {
	server = {
		root_dir = function(fname)
			return vim.loop.cwd()
		end,
		on_attach = function(client, bufnr)
			-- Disable the LSP's formatting capability
			client.server_capabilities.documentFormattingProvider = false
			client.server_capabilities.documentRangeFormattingProvider = false
		end,
		default_settings = {
			["rust-analyzer"] = {
				cargo = {
					targetDir = true, --vim.loop.cwd(),
				},
				files = {
					exclude = {
						"target",
						"~/.cargo",
						"**/.cargo/**",
						".cargo",
						-- vim.loop.cwd(),
					},
				},
				checkOnSave = true,
				check = {
					command = "clippy",
					extraArgs = {
						"--no-deps",
					},
				},
			},
		},
	},
}

---

Running :LspInfo shows this.

[YitzhakMizrahi]

rust-analyzer.files.exclude will not filter what vim.diagnostic.setqflist() shows. That setting affects files rust-analyzer watches/loads; the quickfix list is built by Neovim from diagnostics it has already received.

So the practical fix is to filter diagnostics on the Neovim side before converting them to quickfix items.

Example:

local function rust_workspace_diagnostics_qf()
  local cargo_registry = vim.fs.normalize(vim.fn.expand("~/.cargo/registry/src"))

  local diagnostics = vim.tbl_filter(function(diagnostic)
    local name = vim.api.nvim_buf_get_name(diagnostic.bufnr)
    if name == "" then
      return true
    end

    local path = vim.fs.normalize(name)
    return not vim.startswith(path, cargo_registry)
  end, vim.diagnostic.get(nil))

  vim.fn.setqflist(vim.diagnostic.toqflist(diagnostics), "r")
  vim.cmd.copen()
end

vim.keymap.set("n", "<leader>q", rust_workspace_diagnostics_qf)

If you only want diagnostics for the current project, an even stricter version is to keep only paths under vim.loop.cwd() / vim.uv.cwd().

The reason your current config does not help is that diagnostics from cargo check / clippy can still point at dependency source locations. Once those diagnostics reach Neovim, vim.diagnostic.setqflist() does not know that you want to hide Cargo registry paths unless you filter them before building the quickfix list.