diff --git a/data/core/docview.lua b/data/core/docview.lua
index 73191c23..5c8c5045 100644
--- a/data/core/docview.lua
+++ b/data/core/docview.lua
@@ -94,6 +94,10 @@ function DocView:get_scrollable_size()
   return self:get_line_height() * (#self.doc.lines - 1) + self.size.y
 end
 
+function DocView:get_content_size()
+  return self:get_line_height() * #self.doc.lines
+end
+
 
 function DocView:get_font()
   return style[self.font]
diff --git a/data/core/replview.lua b/data/core/replview.lua
new file mode 100644
index 00000000..3721e86e
--- /dev/null
+++ b/data/core/replview.lua
@@ -0,0 +1,346 @@
+local core = require "core"
+local common = require "core.common"
+local style = require "core.style"
+local keymap = require "core.keymap"
+local Object = require "core.object"
+local View = require "core.view"
+local DocView = require "core.docview"
+
+
+local XEmptyView = View:extend()
+
+function XEmptyView:draw()
+  self:draw_background(style.background)
+end
+
+
+
+local ReplNode = Object:extend()
+
+function ReplNode:new()
+  -- self.type = type or "leaf"
+  self.position = { x = 0, y = 0 }
+  self.size = { x = 0, y = 0 }
+  self.view = XEmptyView()
+  -- self.views = {}
+  self.divider = 0.5
+  self.next = nil
+  -- if self.type == "leaf" then
+  --   self:add_view(EmptyView())
+  -- end
+end
+
+
+-- TODO: check if still okay
+function ReplNode:propagate(fn, ...)
+  if self.next then
+    self.next[fn](self.next, ...)
+  end
+  -- self.a[fn](self.a, ...)
+  -- self.b[fn](self.b, ...)
+end
+
+
+-- FIXME: figure out what to do here.
+function ReplNode:on_mouse_moved(x, y, ...)
+  -- self.hovered_tab = self:get_tab_overlapping_point(x, y)
+  -- if self.type == "leaf" then
+  --   self.active_view:on_mouse_moved(x, y, ...)
+  -- else
+  --   self:propagate("on_mouse_moved", x, y, ...)
+  -- end
+end
+
+
+-- FIXME: line above
+function ReplNode:on_mouse_released(...)
+  -- if self.type == "leaf" then
+  --   self.active_view:on_mouse_released(...)
+  -- else
+  --   self:propagate("on_mouse_released", ...)
+  -- end
+end
+
+
+function ReplNode:consume(node)
+  for k, _ in pairs(self) do self[k] = nil end
+  for k, v in pairs(node) do self[k] = v   end
+end
+
+
+local type_map = { up="vsplit", down="vsplit", left="hsplit", right="hsplit" }
+
+-- function ReplNode:split(dir, view, locked)
+
+
+-- function ReplNode:close_active_view(root)
+
+
+function ReplNode:append_view(view)
+  assert(not self.next, "Tried to add view to non-terminal node")
+  local new_node = ReplNode()
+  new_node:set_view(view)
+  self.next = new_node
+end
+
+-- function ReplNode:add_view(view)
+
+
+-- function ReplNode:set_active_view(view)
+
+function ReplNode:set_view(view)
+  self.view = view
+end
+
+
+-- TODO: check if needed
+function ReplNode:get_view_idx(view)
+  assert(false, "Not yet implemented")
+end
+
+
+function ReplNode:get_node_for_view(view)
+  local current_node = self
+  while current_node do
+    if current_node.view == view then
+      return self
+    end
+    current_node = self.next
+  end
+end
+
+
+-- TODO: check if needed
+function ReplNode:get_parent_node(root)
+  assert(false, "Not yet implemented")
+end
+
+
+-- function ReplNode:get_children(t)
+-- function ReplNode:get_divider_overlapping_point(px, py)
+-- function ReplNode:get_tab_overlapping_point(px, py)
+-- function ReplNode:get_child_overlapping_point(x, y)
+-- function ReplNode:get_tab_rect(idx)
+-- function ReplNode:get_divider_rect()
+-- function ReplNode:get_locked_size()
+
+
+local function copy_position_and_size(dst, src)
+  dst.position.x, dst.position.y = src.position.x, src.position.y
+  dst.size.x, dst.size.y = src.size.x, src.size.y
+end
+
+
+-- local function calc_split_sizes(self, x, y, x1, x2)
+
+
+function ReplNode:update_layout()
+  if self.type == "leaf" then
+    local av = self.active_view
+    if #self.views > 1 then
+      local _, _, _, th = self:get_tab_rect(1)
+      av.position.x, av.position.y = self.position.x, self.position.y + th
+      av.size.x, av.size.y = self.size.x, self.size.y - th
+    else
+      copy_position_and_size(av, self)
+    end
+  else
+    local x1, y1 = self.a:get_locked_size()
+    local x2, y2 = self.b:get_locked_size()
+    if self.type == "hsplit" then
+      calc_split_sizes(self, "x", "y", x1, x2)
+    elseif self.type == "vsplit" then
+      calc_split_sizes(self, "y", "x", y1, y2)
+    end
+    self.a:update_layout()
+    self.b:update_layout()
+  end
+end
+
+
+function ReplNode:update()
+  if self.type == "leaf" then
+    for _, view in ipairs(self.views) do
+      view:update()
+    end
+  else
+    self.a:update()
+    self.b:update()
+  end
+end
+
+
+function ReplNode:draw_tabs()
+  local x, y, _, h = self:get_tab_rect(1)
+  local ds = style.divider_size
+  core.push_clip_rect(x, y, self.size.x, h)
+  renderer.draw_rect(x, y, self.size.x, h, style.background2)
+  renderer.draw_rect(x, y + h - ds, self.size.x, ds, style.divider)
+
+  for i, view in ipairs(self.views) do
+    local x, y, w, h = self:get_tab_rect(i)
+    local text = view:get_name()
+    local color = style.dim
+    if view == self.active_view then
+      color = style.text
+      renderer.draw_rect(x, y, w, h, style.background)
+      renderer.draw_rect(x + w, y, ds, h, style.divider)
+      renderer.draw_rect(x - ds, y, ds, h, style.divider)
+    end
+    if i == self.hovered_tab then
+      color = style.text
+    end
+    core.push_clip_rect(x, y, w, h)
+    x, w = x + style.padding.x, w - style.padding.x * 2
+    local align = style.font:get_width(text) > w and "left" or "center"
+    common.draw_text(style.font, color, text, align, x, y, w, h)
+    core.pop_clip_rect()
+  end
+
+  core.pop_clip_rect()
+end
+
+
+function ReplNode:draw()
+  if self.type == "leaf" then
+    if #self.views > 1 then
+      self:draw_tabs()
+    end
+    local pos, size = self.active_view.position, self.active_view.size
+    core.push_clip_rect(pos.x, pos.y, size.x + pos.x % 1, size.y + pos.y % 1)
+    self.active_view:draw()
+    core.pop_clip_rect()
+  else
+    local x, y, w, h = self:get_divider_rect()
+    renderer.draw_rect(x, y, w, h, style.divider)
+    self:propagate("draw")
+  end
+end
+
+
+
+local ReplView = View:extend()
+
+function ReplView:new()
+  ReplView.super.new(self)
+  self.root_node = ReplNode()
+  self.deferred_draws = {}
+  self.mouse = { x = 0, y = 0 }
+end
+
+
+function ReplView:defer_draw(fn, ...)
+  table.insert(self.deferred_draws, 1, { fn = fn, ... })
+end
+
+
+function ReplView:get_active_node()
+  return self.root_node:get_node_for_view(core.active_view)
+end
+
+
+function ReplView:open_doc(doc)
+  local node = self:get_active_node()
+  if node.locked and core.last_active_view then
+    core.set_active_view(core.last_active_view)
+    node = self:get_active_node()
+  end
+  assert(not node.locked, "Cannot open doc on locked node")
+  for i, view in ipairs(node.views) do
+    if view.doc == doc then
+      node:set_active_view(node.views[i])
+      return view
+    end
+  end
+  local view = DocView(doc)
+  node:add_view(view)
+  self.root_node:update_layout()
+  view:scroll_to_line(view.doc:get_selection(), true, true)
+  return view
+end
+
+
+function ReplView:on_mouse_pressed(button, x, y, clicks)
+  local div = self.root_node:get_divider_overlapping_point(x, y)
+  if div then
+    self.dragged_divider = div
+    return
+  end
+  local node = self.root_node:get_child_overlapping_point(x, y)
+  local idx = node:get_tab_overlapping_point(x, y)
+  if idx then
+    node:set_active_view(node.views[idx])
+    if button == "middle" then
+      node:close_active_view(self.root_node)
+    end
+  else
+    core.set_active_view(node.active_view)
+    node.active_view:on_mouse_pressed(button, x, y, clicks)
+  end
+end
+
+
+function ReplView:on_mouse_released(...)
+  if self.dragged_divider then
+    self.dragged_divider = nil
+  end
+  self.root_node:on_mouse_released(...)
+end
+
+
+function ReplView:on_mouse_moved(x, y, dx, dy)
+  if self.dragged_divider then
+    local node = self.dragged_divider
+    if node.type == "hsplit" then
+      node.divider = node.divider + dx / node.size.x
+    else
+      node.divider = node.divider + dy / node.size.y
+    end
+    node.divider = common.clamp(node.divider, 0.01, 0.99)
+    return
+  end
+
+  self.mouse.x, self.mouse.y = x, y
+  self.root_node:on_mouse_moved(x, y, dx, dy)
+
+  local node = self.root_node:get_child_overlapping_point(x, y)
+  local div = self.root_node:get_divider_overlapping_point(x, y)
+  if div then
+    system.set_cursor(div.type == "hsplit" and "sizeh" or "sizev")
+  elseif node:get_tab_overlapping_point(x, y) then
+    system.set_cursor("arrow")
+  else
+    system.set_cursor(node.active_view.cursor)
+  end
+end
+
+
+function ReplView:on_mouse_wheel(...)
+  local x, y = self.mouse.x, self.mouse.y
+  local node = self.root_node:get_child_overlapping_point(x, y)
+  node.active_view:on_mouse_wheel(...)
+end
+
+
+function ReplView:on_text_input(...)
+  core.active_view:on_text_input(...)
+end
+
+
+function ReplView:update()
+  copy_position_and_size(self.root_node, self)
+  self.root_node:update()
+  self.root_node:update_layout()
+end
+
+
+function ReplView:draw()
+  self.root_node:draw()
+  while #self.deferred_draws > 0 do
+    local t = table.remove(self.deferred_draws)
+    t.fn(table.unpack(t))
+  end
+end
+
+
+return ReplView
diff --git a/replview.try1.lua b/replview.try1.lua
new file mode 100644
index 00000000..c1135609
--- /dev/null
+++ b/replview.try1.lua
@@ -0,0 +1,256 @@
+local core = require "core"
+local common = require "core.common"
+local style = require "core.style"
+local keymap = require "core.keymap"
+local Object = require "core.object"
+local View = require "core.view"
+local DocView = require "core.docview"
+
+local ReplNode = Object:extend()
+
+function ReplNode:new(view)
+  -- self.type = type or "leaf"
+  self.position = { x = 0, y = 0 }
+  self.size = { x = 0, y = 0 }
+  self.view = view
+  -- self.views = {}
+  self.divider = 0.5
+end
+
+
+function ReplNode:on_mouse_moved(x, y, ...)
+  self.view:on_mouse_moved(x, y, ...)
+end
+
+
+function ReplNode:on_mouse_released(...)
+  self.view:on_mouse_released(...)
+end
+
+
+-- local type_map = { up="vsplit", down="vsplit", left="hsplit", right="hsplit" }
+
+-- function Node:split(dir, view, locked)
+
+-- function Node:close_active_view(root)
+
+function ReplNode:set_active_view()
+  -- TODO: understand what the call below actually does.
+  core.set_active_view(self.view)
+end
+
+
+-- function Node:get_view_idx(view)
+
+
+-- function Node:get_node_for_view(view)
+
+
+-- function Node:get_parent_node(root)
+
+-- function Node:get_children(t)
+
+
+-- function ReplNode:get_divider_overlapping_point(px, py)
+
+-- function Node:get_tab_overlapping_point(px, py)
+
+
+-- function Node:get_child_overlapping_point(x, y)
+
+
+-- function Node:get_tab_rect(idx)
+
+
+-- function Node:get_divider_rect()
+
+
+function ReplNode:get_locked_size()
+  if self.locked then
+    local size = self.view.size
+    return size.x, size.y
+  end
+end
+
+
+local function copy_position_and_size(dst, src)
+  dst.position.x, dst.position.y = src.position.x, src.position.y
+  dst.size.x, dst.size.y = src.size.x, src.size.y
+end
+
+
+-- calculating the sizes is the same for hsplits and vsplits, except the x/y
+-- axis are swapped; this function lets us use the same code for both
+-- local function calc_split_sizes(self, x, y, x1, x2)
+
+
+function ReplNode:update_layout()
+  copy_position_and_size(self.view, self)
+end
+
+
+function ReplNode:update()
+  if self.view then
+    self.view:update()
+  end
+end
+
+
+-- function Node:draw_tabs()
+
+function ReplNode:draw()
+  local pos, size = self.view.position, self.view.size
+  core.push_clip_rect(pos.x, pos.y, size.x + pos.x % 1, size.y + pos.y % 1)
+  self.view:draw()
+  core.pop_clip_rect()
+end
+
+
+
+local ReplView = View:extend()
+
+function ReplView:new()
+  ReplView.super.new(self)
+  -- local first_node = ReplNode()
+  -- self.nodes = { first_node }
+  self.nodes = { }
+  self.active_node_index = 0
+  self.deferred_draws = {}
+  self.mouse = { x = 0, y = 0 }
+end
+
+
+-- TODO: figure out what the deferred_draws are doing
+function ReplView:defer_draw(fn, ...)
+  table.insert(self.deferred_draws, 1, { fn = fn, ... })
+end
+
+
+function ReplView:get_active_node()
+  if self.active_node_index > 0 then
+    return self.nodes[self.active_node_index]
+  end
+end
+
+-- FIXME: find out something better
+repl_left_margin, repl_top_margin = 10, 10
+
+function ReplView:update_layout()
+  local x, y = repl_left_margin, repl_top_margin
+  -- CONTINUE HERE
+end
+
+
+function ReplView:open_doc(doc)
+--   local node = self:get_active_node()
+--   if node.locked and core.last_active_view then
+--     core.set_active_view(core.last_active_view)
+--     node = self:get_active_node()
+--   end
+--   assert(not node.locked, "Cannot open doc on locked node")
+  for i, node in ipairs(self.nodes) do
+    local view = node.view
+  -- for i, view in ipairs(node.views) do
+    if view.doc == doc then
+      node:set_active_view()
+      return view
+    end
+  end
+  local view = DocView(doc)
+  local node = ReplNode(view)
+  self.nodes[#self.nodes + 1] = node
+  self.active_node_index = #self.nodes
+  self:update_layout()
+  -- node:add_view(view)
+  -- TODO: replace the call below with something appropriate.
+  -- self.root_node:update_layout()
+  -- TODO: manage to assign the correct x, y position to the new node.
+  view:scroll_to_line(view.doc:get_selection(), true, true)
+  return view
+end
+
+-- TODO: CONTINUE HERE
+function RootView:on_mouse_pressed(button, x, y, clicks)
+  local div = self.root_node:get_divider_overlapping_point(x, y)
+  if div then
+    self.dragged_divider = div
+    return
+  end
+  local node = self.root_node:get_child_overlapping_point(x, y)
+  local idx = node:get_tab_overlapping_point(x, y)
+  if idx then
+    node:set_active_view(node.views[idx])
+    if button == "middle" then
+      node:close_active_view(self.root_node)
+    end
+  else
+    core.set_active_view(node.active_view)
+    node.active_view:on_mouse_pressed(button, x, y, clicks)
+  end
+end
+
+
+function RootView:on_mouse_released(...)
+  if self.dragged_divider then
+    self.dragged_divider = nil
+  end
+  self.root_node:on_mouse_released(...)
+end
+
+
+function RootView:on_mouse_moved(x, y, dx, dy)
+  if self.dragged_divider then
+    local node = self.dragged_divider
+    if node.type == "hsplit" then
+      node.divider = node.divider + dx / node.size.x
+    else
+      node.divider = node.divider + dy / node.size.y
+    end
+    node.divider = common.clamp(node.divider, 0.01, 0.99)
+    return
+  end
+
+  self.mouse.x, self.mouse.y = x, y
+  self.root_node:on_mouse_moved(x, y, dx, dy)
+
+  local node = self.root_node:get_child_overlapping_point(x, y)
+  local div = self.root_node:get_divider_overlapping_point(x, y)
+  if div then
+    system.set_cursor(div.type == "hsplit" and "sizeh" or "sizev")
+  elseif node:get_tab_overlapping_point(x, y) then
+    system.set_cursor("arrow")
+  else
+    system.set_cursor(node.active_view.cursor)
+  end
+end
+
+
+function RootView:on_mouse_wheel(...)
+  local x, y = self.mouse.x, self.mouse.y
+  local node = self.root_node:get_child_overlapping_point(x, y)
+  node.active_view:on_mouse_wheel(...)
+end
+
+
+function RootView:on_text_input(...)
+  core.active_view:on_text_input(...)
+end
+
+
+function RootView:update()
+  copy_position_and_size(self.root_node, self)
+  self.root_node:update()
+  self.root_node:update_layout()
+end
+
+
+function RootView:draw()
+  self.root_node:draw()
+  while #self.deferred_draws > 0 do
+    local t = table.remove(self.deferred_draws)
+    t.fn(table.unpack(t))
+  end
+end
+
+
+return RootView