feat(autocmd): preview qflist files using <C-n> <C-p>

lua/custom/autocommands.lua

@@ -133,4 +133,71 @@ vim.api.nvim_create_autocmd({ 'LspAttach' }, {
     end,
 })
 
+-- https://www.reddit.com/r/neovim/comments/1fhy2xi/comment/lnea46c/
+vim.api.nvim_create_autocmd('FileType', {
+    pattern = 'qf',
+    desc = 'navigate and preview qf-list results using <C-p> and <C-n>',
+    callback = function(event)
+        local opts = { buffer = event.buf, silent = true }
+        local init_bufnr = vim.fn.bufnr('#')
+        vim.keymap.set('n', '<C-n>', function()
+            if vim.fn.line('.') == vim.fn.line('$') then
+                vim.notify('E553: No more items', vim.log.levels.ERROR)
+                return
+            end
+            vim.cmd('wincmd p') -- jump to current displayed file
+            vim.cmd(
+                (vim.fn.bufnr('%') ~= init_bufnr and vim.bo.filetype ~= 'qf')
+                        and ('bd | wincmd p | cn | res %d'):format(
+                            math.floor(
+                                (
+                                    vim.o.lines
+                                    - vim.o.cmdheight
+                                    - (vim.o.laststatus == 0 and 0 or 1)
+                                    - (vim.o.tabline == '' and 0 or 1)
+                                )
+                                        / 3
+                                        * 2
+                                    + 0.5
+                            ) - 1
+                        )
+                    or 'cn'
+            )
+            vim.cmd('execute "normal! zz"')
+            if vim.bo.filetype ~= 'qf' then
+                vim.cmd('wincmd p')
+            end
+        end, opts)
+
+        vim.keymap.set('n', '<C-p>', function()
+            if vim.fn.line('.') == 1 then
+                vim.notify('E553: No more items', vim.log.levels.ERROR)
+                return
+            end
+            vim.cmd('wincmd p') -- jump to current displayed file
+            vim.cmd(
+                (vim.fn.bufnr('%') ~= init_bufnr and vim.bo.filetype ~= 'qf')
+                        and ('bd | wincmd p | cN | res %d'):format(
+                            math.floor(
+                                (
+                                    vim.o.lines
+                                    - vim.o.cmdheight
+                                    - (vim.o.laststatus == 0 and 0 or 1)
+                                    - (vim.o.tabline == '' and 0 or 1)
+                                )
+                                        / 3
+                                        * 2
+                                    + 0.5
+                            ) - 1
+                        )
+                    or 'cN'
+            )
+            vim.cmd('execute "normal! zz"')
+            if vim.bo.filetype ~= 'qf' then
+                vim.cmd('wincmd p')
+            end
+        end, opts)
+    end,
+})
+
 vim.opt.updatetime = 100