From eebffce98e4c9a53db1f9c99781793b48adce507 Mon Sep 17 00:00:00 2001
From: Sanchayan Maity <sanchayan@sanchayanmaity.net>
Date: Sat, 25 Sep 2021 15:20:44 +0530
Subject: [PATCH] nvim: lsp: Add back custom preview function

Follow up to 469e367.
---
 nvim/.config/nvim/lua/lsp.lua | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/nvim/.config/nvim/lua/lsp.lua b/nvim/.config/nvim/lua/lsp.lua
index 09236f2..6e0fe11 100644
--- a/nvim/.config/nvim/lua/lsp.lua
+++ b/nvim/.config/nvim/lua/lsp.lua
@@ -5,6 +5,19 @@ local ts_utils   = require("nvim-lsp-ts-utils")
 local null_ls    = require("null-ls")
 local util       = require("lspconfig/util")
 
+-- https://github.com/neovim/nvim-lspconfig/wiki/User-contributed-tips
+local function preview_location_callback(_, result)
+  if result == nil or vim.tbl_isempty(result) then
+    return nil
+  end
+  vim.lsp.util.preview_location(result[1])
+end
+
+function PeekDefinition()
+  local params = vim.lsp.util.make_position_params()
+  return vim.lsp.buf_request(0, 'textDocument/definition', params, preview_location_callback)
+end
+
 local on_attach = function(client, bufnr)
   signature.on_attach({
     bind         = true,
@@ -33,6 +46,7 @@ local on_attach = function(client, bufnr)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '1gd'      , '<cmd>lua vim.lsp.buf.document_symbol()<CR>' , opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '1gD'      , '<cmd>lua vim.lsp.buf.workspace_symbol()<CR>', opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gR'       , '<cmd>lua vim.lsp.buf.rename()<CR>'          , opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'pd'       , '<cmd>lua PeekDefinition()<CR>'              , opts)
 
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev { wrap = false }<CR>', opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next { wrap = false }<CR>', opts)