nvim: move out lsp on_attach

.config/nvim/lua/lsp.lua

@@ -0,0 +1,32 @@
+local M = {}
+
+M.on_attach = function(client, bufnr)
+    local telescope = require("telescope.builtin")
+    local methods = vim.lsp.protocol.Methods
+    local function nnoremap(bind, callback, userargs)
+        local args = userargs or {}
+        args.buffer = bufnr
+        vim.keymap.set("n", bind, callback, args)
+    end
+
+    nnoremap("K", vim.lsp.buf.hover)
+    nnoremap("<C-k>", vim.lsp.buf.signature_help)
+    nnoremap("gd", telescope.lsp_definitions)
+    nnoremap("gu", telescope.lsp_references)
+    nnoremap("<leader>ca", vim.lsp.buf.code_action)
+    nnoremap("<leader>cl", vim.lsp.codelens.run)
+    nnoremap("<leader>r", vim.lsp.buf.rename)
+    nnoremap("<leader>f", function() vim.lsp.buf.format { async = true } end)
+
+    local filetype = vim.api.nvim_get_option_value("filetype", { buf = bufnr })
+    if
+        client:supports_method(methods.textDocument_inlayHint)
+        -- Never start cabal with inlay hint request
+        -- Related: https://github.com/mrcjkb/haskell-tools.nvim/discussions/485
+        and filetype ~= "cabal"
+    then
+        vim.lsp.inlay_hint.enable(true, { bufnr = bufnr })
+    end
+end
+
+return M