Error on new or re-ordered lines

README.md

@@ -2,6 +2,8 @@
 
 Improved UI and workflow for the Neovim quickfix
 
+TODO finish docs
+
 <!-- TOC -->
 
 - [Requirements](#requirements)

lua/quicker/editor.lua

@@ -63,9 +63,13 @@ end
 local function add_qf_error(bufnr, lnum, text, text_hl)
   local line = vim.api.nvim_buf_get_lines(bufnr, lnum - 1, lnum, true)[1]
   local col = line:find(config.display.borders.vert, 1, true)
-  col = line:find(config.display.borders.vert, col + config.display.borders.vert:len(), true)
-    + config.display.borders.vert:len()
-    - 1
+  if col then
+    col = line:find(config.display.borders.vert, col + config.display.borders.vert:len(), true)
+      + config.display.borders.vert:len()
+      - 1
+  else
+    col = 0
+  end
   local offset = vim.api.nvim_strwidth(line:sub(1, col))
   local ns = vim.api.nvim_create_namespace("quicker_err")
   vim.api.nvim_buf_set_extmark(bufnr, ns, lnum - 1, col, {
@@ -233,9 +237,19 @@ local function save_changes(bufnr, loclist_win)
     (function()
       local parsed = parse_line(line)
       local found_idx = find_next(saved_items, item_idx, parsed)
+
+      -- If we didn't find a match, the line was most likely added or reordered
       if not found_idx then
-        -- TODO FIXME log an error that we couldn't find the line
-        -- Adding and reordering lines is not allowed
+        add_qf_error(
+          bufnr,
+          i,
+          "quicker.nvim does not support adding or reordering quickfix items",
+          "DiagnosticError"
+        )
+        if winid then
+          vim.api.nvim_win_set_cursor(winid, { i, 0 })
+        end
+        exit_early = true
         return
       end
       item_idx = found_idx + 1