nvim: support multiple servers on LSP hover.

nvim/lua/user/options.lua

@@ -105,6 +105,12 @@ vim.diagnostic.config({
     }
 })
 
+
+-- LSP
+
+-- Provide a custom hover implementation
+vim.lsp.buf.hover = require("user.utils.lsp").hover
+
 -------------------------------------------------------
 -- Extras
 -------------------------------------------------------

nvim/lua/user/utils/lsp.lua

@@ -1,6 +1,39 @@
-
 local M = {}
 
+-- Hover that supports responses from multiple language servers.
+function M.hover()
+    local params = vim.lsp.util.make_position_params()
+
+    vim.lsp.buf_request_all(0, 'textDocument/hover', params, function(responses)
+        local sections = {}
+        for _, response in pairs(responses) do
+            if response.result then
+                local result = response.result
+                local section = vim.lsp.util.convert_input_to_markdown_lines(result.contents)
+                sections = vim.list_extend(sections, { section })
+            end
+        end
+
+        local markdown_lines = {}
+        for i, content in ipairs(sections) do
+            markdown_lines = vim.list_extend(markdown_lines, content)
+            if i < #sections then
+                table.insert(markdown_lines, "---")
+            end
+        end
+
+        markdown_lines = table.concat(markdown_lines, "\n")
+        markdown_lines = vim.split(markdown_lines, "\n", { trimempty = true })
+        if vim.tbl_isempty(markdown_lines) then
+            return
+        end
+
+        vim.lsp.util.open_floating_preview(markdown_lines, 'markdown', {
+            focus_id = "lsp_hover"
+        })
+    end)
+end
+
 function M.document_highlight(bufnr)
     local group = vim.api.nvim_create_augroup('lsp_document_highlight', { clear = false })
     vim.api.nvim_clear_autocmds({