Use the apply_text_edits from util.

runtime/lua/vim/lsp/buf.lua

@@ -259,93 +259,6 @@ function M.completion(context)
   end)
 end
 
-local function apply_edit_to_lines(lines, start_pos, end_pos, new_lines)
-  -- 0-indexing to 1-indexing makes things look a bit worse.
-  local i_0 = start_pos[1] + 1
-  local i_n = end_pos[1] + 1
-  local n = i_n - i_0 + 1
-  if not lines[i_0] or not lines[i_n] then
-    error(vim.inspect{#lines, i_0, i_n, n, start_pos, end_pos, new_lines})
-  end
-  local prefix = ""
-  local suffix = lines[i_n]:sub(end_pos[2]+1)
-  lines[i_n] = lines[i_n]:sub(1, end_pos[2]+1)
-  if start_pos[2] > 0 then
-    prefix = lines[i_0]:sub(1, start_pos[2])
-    -- lines[i_0] = lines[i_0]:sub(start.character+1)
-  end
-  -- TODO(ashkan) figure out how to avoid copy here. likely by changing algo.
-  new_lines = vim.list_extend({}, new_lines)
-  if #suffix > 0 then
-    new_lines[#new_lines] = new_lines[#new_lines]..suffix
-  end
-  if #prefix > 0 then
-    new_lines[1] = prefix..new_lines[1]
-  end
-  if #new_lines >= n then
-    for i = 1, n do
-      lines[i + i_0 - 1] = new_lines[i]
-    end
-    for i = n+1,#new_lines do
-      table.insert(lines, i_n + 1, new_lines[i])
-    end
-  else
-    for i = 1, #new_lines do
-      lines[i + i_0 - 1] = new_lines[i]
-    end
-    for _ = #new_lines+1, n do
-      table.remove(lines, i_0 + #new_lines + 1)
-    end
-  end
-end
-
-local function apply_text_edits(text_edits, bufnr)
-  if not next(text_edits) then return end
-  -- nvim.print("Start", #text_edits)
-  local start_line, finish_line = math.huge, -1
-  local cleaned = {}
-  for _, e in ipairs(text_edits) do
-    start_line = math.min(e.range.start.line, start_line)
-    finish_line = math.max(e.range["end"].line, finish_line)
-    table.insert(cleaned, {
-      A = {e.range.start.line; e.range.start.character};
-      B = {e.range["end"].line; e.range["end"].character};
-      lines = vim.split(e.newText, '\n', true);
-    })
-  end
-  local lines = api.nvim_buf_get_lines(bufnr, start_line, finish_line + 1, false)
-  for i, e in ipairs(cleaned) do
-    -- nvim.print(i, "e", e.A, e.B, #e.lines[#e.lines], e.lines)
-    local y = 0
-    local x = 0
-    -- TODO(ashkan) this could be done in O(n) with dynamic programming
-    for j = 1, i-1 do
-      local o = cleaned[j]
-      -- nvim.print(i, "o", o.A, o.B, x, y, #o.lines[#o.lines], o.lines)
-      if o.A[1] <= e.A[1] and o.A[2] <= e.A[2] then
-        y = y - (o.B[1] - o.A[1] + 1) + #o.lines
-        -- Same line
-        if #o.lines > 1 then
-          x = -e.A[2] + #o.lines[#o.lines]
-        else
-          if o.A[1] == e.A[1] then
-            -- Try to account for insertions.
-            -- TODO how to account for deletions?
-            x = x - (o.B[2] - o.A[2]) + #o.lines[#o.lines]
-          end
-        end
-      end
-    end
-    local A = {e.A[1] + y - start_line, e.A[2] + x}
-    local B = {e.B[1] + y - start_line, e.B[2] + x}
-    -- if x ~= 0 or y ~= 0 then
-    --   nvim.print(i, "_", e.A, e.B, y, x, A, B, e.lines)
-    -- end
-    apply_edit_to_lines(lines, A, B, e.lines)
-  end
-  api.nvim_buf_set_lines(bufnr, start_line, finish_line + 1, false, lines)
-end
-
 function M.formatting(options)
   validate { options = {options, 't', true} }
   local params = {
@@ -355,7 +268,7 @@ function M.formatting(options)
   params.options[vim.type_idx] = vim.types.dictionary
   return request('textDocument/formatting', params, function(_, _, result)
     if not result then return end
-    apply_text_edits(result)
+    util.apply_text_edits(result)
   end)
 end
 
@@ -378,7 +291,7 @@ function M.range_formatting(options, start_pos, end_pos)
   params.options[vim.type_idx] = vim.types.dictionary
   return request('textDocument/rangeFormatting', params, function(_, _, result)
     if not result then return end
-    apply_text_edits(result)
+    util.apply_text_edits(result)
   end)
 end