diff --git a/hgext3rd/interactiveui.py b/hgext3rd/interactiveui.py
new file mode 100644
--- /dev/null
+++ b/hgext3rd/interactiveui.py
@@ -0,0 +1,82 @@
+# interactiveui.py: display information and allow for left/right control
+#
+# Copyright 2017 Facebook, Inc.
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+import os
+import sys
+import termios
+import tty
+
+def clearline():
+    w = sys.stdout
+    # ANSI
+    # ESC[#A : up # lines
+    # ESC[K : clear to end of line
+    w.write('\033[1A\033[K')
+    w.flush()
+
+def getchar(fd):
+    # from:
+    # https://github.com/pallets/click/blob/master/click/_termui_impl.py#L534
+    if not os.isatty(fd):
+        # TODO: figure out tests
+        return None
+    try:
+        attr = termios.tcgetattr(fd)
+        try:
+            tty.setraw(fd)
+            ch = os.read(fd, 32)
+        finally:
+            termios.tcsetattr(fd, termios.TCSADRAIN, attr)
+    except termios.error:
+        pass
+    if ch == '\x03':
+        raise KeyboardInterrupt()
+    if ch == '\x04':
+        raise EOFError()
+    return ch
+
+class viewframe(object):
+    # framework for view
+    def __init__(self, ui, repo, index):
+        self.ui = ui
+        self.repo = repo
+        self.index = index
+    def render():
+        # returns string to print
+        pass
+    def enter():
+        # handle user keypress return
+        pass
+    def leftarrow():
+        # handle user keypress left arrow
+        pass
+    def rightarrow():
+        # handle user keypress right arrow
+        pass
+
+def view(viewobj):
+    done = False
+    s = viewobj.render()
+    print(s)
+    while not done:
+        output = getchar(sys.stdin.fileno())
+        if str(repr(output)) == '\'q\'':
+            done = True
+            break
+        if str(repr(output)) == '\'\\r\'':
+            # \r = return
+            viewobj.enter()
+            done = True
+            break
+        if str(repr(output)) == '\'\\x1b[C\'':
+            viewobj.rightarrow()
+        if str(repr(output)) == '\'\\x1b[D\'':
+            viewobj.leftarrow()
+        for i in range(len(s.split("\n"))):
+            clearline()
+        s = viewobj.render()
+        print(s)
diff --git a/hgext3rd/undo.py b/hgext3rd/undo.py
--- a/hgext3rd/undo.py
+++ b/hgext3rd/undo.py
@@ -572,7 +572,34 @@
                                         branch = branch)
 
     if preview:
-        _preview(ui, repo, reverseindex)
+        try:
+            interactiveui = extensions.find('interactiveui')
+        except KeyError:
+            _preview(ui, repo, reverseindex)
+            return
+
+        class undopreview(interactiveui.viewframe):
+            def init(self, repo, ui, index):
+                self.repo = repo
+                self.ui = ui
+                self.index = index
+            def render(self):
+                ui = self.ui
+                ui.pushbuffer()
+                _preview(ui, self.repo, self.index)
+                return ui.popbuffer()
+            def rightarrow(self):
+                self.index += 1
+            def leftarrow(self):
+                self.index -= 1
+            def enter(self):
+                del opts["preview"]
+                opts["absolute"] = "absolute"
+                opts["index"] = self.index
+                undo(ui, repo, *args, **opts)
+                return
+        viewobj = undopreview(ui, repo, reverseindex)
+        interactiveui.view(viewobj)
         return
 
     with repo.wlock(), repo.lock(), repo.transaction("undo"):