WIP: take 2 for renderer architecture

Author: sudo-tee

lua/opencode/ui/renderer.lua

@@ -0,0 +1,69 @@
+local M = {}
+
+function M.is_append(old_lines, new_lines)
+  if type(old_lines) ~= 'table' or type(new_lines) ~= 'table' then
+    return false
+  end
+
+  if #new_lines <= #old_lines then
+    return false
+  end
+
+  for i = #old_lines, 1, -1 do
+    if old_lines[i] ~= new_lines[i] then
+      return false
+    end
+  end
+
+  return true
+end
+
+function M.tail_lines(old_lines, new_lines)
+  return { unpack(new_lines, #old_lines + 1) }
+end
+
+function M.tail_extmarks(row_offset, extmarks)
+  local out = {}
+
+  for _, extmark in ipairs(extmarks or {}) do
+    if extmark.row >= row_offset then
+      out[#out + 1] = {
+        row = extmark.row - row_offset,
+        col = extmark.col,
+        opts = vim.deepcopy(extmark.opts),
+      }
+    end
+  end
+
+  return out
+end
+
+function M.can_append(old_rendered, new_rendered)
+  if type(old_rendered) ~= 'table' or type(new_rendered) ~= 'table' then
+    return false
+  end
+
+  if not M.is_append(old_rendered.lines, new_rendered.lines) then
+    return false
+  end
+
+  if not vim.deep_equal(old_rendered.actions or {}, new_rendered.actions or {}) then
+    return false
+  end
+
+  local old_extmarks = old_rendered.extmarks or {}
+  local new_extmarks = new_rendered.extmarks or {}
+  if #new_extmarks < #old_extmarks then
+    return false
+  end
+
+  for index = 1, #old_extmarks do
+    if not vim.deep_equal(old_extmarks[index], new_extmarks[index]) then
+      return false
+    end
+  end
+
+  return true
+end
+
+return M