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diff --git a/.config/nvim/lsp/idris2_lsp.lua b/.config/nvim/lsp/idris2_lsp.lua
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+++ b/.config/nvim/lsp/idris2_lsp.lua
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+---@brief
+---
+--- https://github.com/idris-community/idris2-lsp
+---
+--- The Idris 2 language server.
+---
+--- Plugins for the Idris 2 filetype include
+--- [Idris2-Vim](https://github.com/edwinb/idris2-vim) (fewer features, stable) and
+--- [Nvim-Idris2](https://github.com/ShinKage/nvim-idris2) (cutting-edge,
+--- experimental).
+---
+--- Idris2-Lsp requires a build of Idris 2 that includes the "Idris 2 API" package.
+--- Package managers with known support for this build include the
+--- [AUR](https://aur.archlinux.org/packages/idris2/) and
+--- [Homebrew](https://formulae.brew.sh/formula/idris2#default).
+---
+--- If your package manager does not support the Idris 2 API, you will need to build
+--- Idris 2 from source. Refer to the
+--- [the Idris 2 installation instructions](https://github.com/idris-lang/Idris2/blob/main/INSTALL.md)
+--- for details.  Steps 5 and 8 are listed as "optional" in that guide, but they are
+--- necessary in order to make the Idris 2 API available.
+---
+--- You need to install a version of Idris2-Lsp that is compatible with your
+--- version of Idris 2. There should be a branch corresponding to every released
+--- Idris 2 version after v0.4.0. Use the latest commit on that branch. For example,
+--- if you have Idris v0.5.1, you should use the v0.5.1 branch of Idris2-Lsp.
+---
+--- If your Idris 2 version is newer than the newest Idris2-Lsp branch, use the
+--- latest commit on the `master` branch, and set a reminder to check the Idris2-Lsp
+--- repo for the release of a compatible versioned branch.
+
+local util = require 'lspconfig.util'
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'idris2-lsp' },
+  filetypes = { 'idris2' },
+  root_dir = function(bufnr, on_dir)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    on_dir(util.root_pattern '*.ipkg'(fname))
+  end,
+}