Initial commitHEAD0.0.1master

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diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+*~
+venv/
+venv3/
+.eggs/
+editty.egg-info
+*.pyc
+.tox/
+.stestr/
+AUTHORS
+ChangeLog
+build/
+dist/
diff --git a/.stestr.conf b/.stestr.conf
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index 0000000..f90b1f5
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+++ b/.stestr.conf
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+[DEFAULT]
+test_path=tests
+top_dir=./
diff --git a/README.rst b/README.rst
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+++ b/README.rst
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+Editty
+======
+
+Editty is a terminal-based non-linear editor for terminal recordings.
+
+Installation
+------------
+
+Source
+~~~~~~
+
+When installing from source, it is recommended (but not required) to
+install Editty in a virtualenv.  To set one up::
+
+  virtualenv --python=python3 editty-env
+  source editty-env/bin/activate
+
+To install the latest version from pypi::
+
+  pip install editty
+
+To install from a git checkout::
+
+  pip install .
+
+In order to use the dissolve transition, you must run Editty in a
+256-color capable terminal, such as gnome-terminal or xterm.
+
+Usage
+-----
+
+After installing Editty, you should be able to run it by invoking
+``editty``.  If you installed it in a virtualenv, you can invoke it
+without activating the virtualenv with ``/path/to/editty-venv/bin/editty``.
+which you may wish to add to your shell aliases.  Use ``editty
+--help`` to see a list of command line options available.
+
+Once running, pressing the F1 key will show help text.
+
+Editty can load recordings in the formats produced by the ``script``
+and ``ttyrec`` commands.  It renders output in ``ttyrec`` format.
+
+Editty does not modify the original source files, but rather
+references them by path name.  Editty stores the edit decision list in
+its own JSON-based file format (use the ``.edit`` extension).
+
+To exit, press CTRL-q.
+
+Source
+------
+
+Git repo: http://git.inaugust.com/cgit/editty/
+
+Contributing
+------------
+
+To send your latest commit as a patch, run::
+
+  git send-email --to corvus@gnu.org --annotate -1
+
+Or, if you don't have ``git send-email`` configured, run::
+
+  git format-patch --stdout HEAD~1 > /tmp/editty.patch
+
+And send `/tmp/editty.patch` to corvus@gnu.org using your email
+client.
+
+License
+-------
+
+Editty is licensed under the GPLv3 or later.  Please see the COPYING
+file for details.
diff --git a/editty/__init__.py b/editty/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/editty/__init__.py
diff --git a/editty/editty.py b/editty/editty.py
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index 0000000..cf4449b
--- /dev/null
+++ b/editty/editty.py
@@ -0,0 +1,1134 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2019 James E. Blair <corvus@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import argparse
+import copy
+import os
+import sys
+import struct
+import time
+import threading
+import json
+import uuid
+try:
+    import queue
+except:
+    import Queue as queue
+import logging
+import math
+
+import urwid
+
+from editty.segment import *
+from editty.program import *
+import editty.source
+
+PALETTE = [
+    ('reversed', 'standout', ''),
+
+    ('timeline-title', 'dark cyan', ''),
+    ('selected-timeline-title', 'light cyan', ''),
+
+    ('timeline-1-text', 'dark cyan', ''),
+    ('timeline-1', 'black', 'dark cyan'),
+    ('timeline-1-selection', 'black,standout', 'dark cyan'),
+    ('selected-timeline-1-text', 'light cyan', ''),
+    ('selected-timeline-1', 'black', 'light cyan'),
+    ('selected-timeline-1-selection', 'black,standout', 'light cyan'),
+
+    ('timeline-2-text', 'dark magenta', ''),
+    ('timeline-2', 'black', 'dark magenta'),
+    ('timeline-2-selection', 'black,standout', 'dark magenta'),
+    ('selected-timeline-2-text', 'light magenta', ''),
+    ('selected-timeline-2', 'black', 'light magenta'),
+    ('selected-timeline-2-selection', 'black,standout', 'light magenta'),
+
+    ('timeline-3-text', 'dark green', ''),
+    ('timeline-3', 'black', 'dark green'),
+    ('timeline-3-selection', 'black,standout', 'dark green'),
+    ('selected-timeline-3-text', 'light green', ''),
+    ('selected-timeline-3', 'black', 'light green'),
+    ('selected-timeline-3-selection', 'black,standout', 'light green'),
+
+    ('timeline-4-text', 'brown', ''),
+    ('timeline-4', 'black', 'brown'),
+    ('timeline-4-selection', 'black,standout', 'brown'),
+    ('selected-timeline-4-text', 'yellow', ''),
+    ('selected-timeline-4', 'black', 'yellow'),
+    ('selected-timeline-4-selection', 'black,standout', 'yellow'),
+
+    ('timeline-black-text', 'dark gray', ''),
+    ('timeline-black', 'black', 'dark gray'),
+    ('timeline-black-selection', 'black,standout', 'dark gray'),
+    ('selected-timeline-black-text', 'light gray', ''),
+    ('selected-timeline-black', 'black', 'light gray'),
+    ('selected-timeline-black-selection', 'black,standout', 'light gray'),
+
+    ('start-timecode', 'dark cyan', ''),
+    ('selected-start-timecode', 'light cyan', ''),
+    ('current-timecode', 'light red', ''),
+    ('end-timecode', 'dark cyan', ''),
+    ('selected-end-timecode', 'light cyan', ''),
+]
+
+FOCUS_MAP = {}
+for x in PALETTE:
+    name = x[0]
+    if 'selected-'+name in [y[0] for y in PALETTE]:
+        FOCUS_MAP[name]='selected-'+name
+
+class Monitor(urwid.Widget):
+    _selectable = False
+    _sizing = frozenset([urwid.widget.FIXED])
+
+    signals = ['closed', 'beep', 'leds', 'title']
+
+    def __init__(self, editor, size):
+        self.log = logging.getLogger('monitor')
+        self.editor = editor
+        self.size = size
+        self.term_modes = urwid.TermModes()
+        self.term = urwid.TermCanvas(size[0], size[1], self)
+        self.term.modes.main_charset = urwid.vterm.CHARSET_UTF8
+        self.off_canvas = urwid.TextCanvas(maxcol=size[0], text=[b'' for x in range(size[1])])
+        self.off_canvas.cacheable = False
+        self.off = False
+
+    def render(self, size, focus=False):
+        if self.off:
+            return self.off_canvas
+        else:
+            return self.term
+
+    def pack(self, size, focus=False):
+        self.log.debug("pack")
+        return self.size
+
+    def rows(self, size, focus=False):
+        return self.size[1]
+
+    def keypress(self, size, key):
+        return None
+
+    def beep(self):
+        self._emit('beep')
+
+    def set_title(self, title):
+        self._emit('title', title)
+
+    def setFrame(self, frame):
+        self.term.term = [line[:] for line in frame.content]
+        self.term.set_term_cursor(frame.cursor[0], frame.cursor[1])
+        self.editor.loop.draw_screen()
+
+    def setTimecode(self, start, current, end):
+        if start is not None:
+            self._setTimecode(self.editor.screen.start_timecode,
+                              'selected-start-timecode', start)
+        else:
+            self._setTimecode(self.editor.screen.start_timecode,
+                              'start-timecode', 0.0)
+        self._setTimecode(self.editor.screen.timecode,
+                          'current-timecode', current)
+        if end is not None:
+            self._setTimecode(self.editor.screen.end_timecode,
+                              'selected-end-timecode', end)
+        else:
+            self._setTimecode(self.editor.screen.end_timecode,
+                              'end-timecode', 0.0)
+
+    def _setTimecode(self, widget, attr, seconds):
+        hours, seconds = divmod(seconds, 60*60)
+        minutes, seconds = divmod(seconds, 60)
+        tc = '%02i:%02i:%09.6f' % (hours, minutes, seconds)
+        widget.set_text((attr, tc))
+
+class Timeline(urwid.Text):
+    _selectable = True
+
+    def __init__(self):
+        super(Timeline, self).__init__('')
+        self.log = logging.getLogger('timeline')
+        self.uuid = str(uuid.uuid4())
+        self.set_text('AB'*60)
+        self.log.debug("init")
+        self.scale = 1.0  # one second per char
+        self.hoffset = 0
+        self.current_width = 0
+        self.framecounts = []
+        self.framecolors = []
+        self.start_time = None
+        self.end_time = None
+        self.current_time = 0.0
+        self.current_frame = None
+        self.monitor = None
+        self.play_queue = queue.Queue()
+        self._thread = threading.Thread(target=self.run)
+        self._thread.daemon=True
+        self._thread.start()
+        self.playing = False
+        self.color = 'timeline-black'
+
+    def toJSON(self):
+        if self.program:
+            program = self.program.uuid
+        else:
+            program = None
+        return dict(uuid=self.uuid,
+                    color=self.color,
+                    program=program)
+
+    @classmethod
+    def fromJSON(cls, data):
+        t = Timeline()
+        t.uuid = data['uuid']
+        t.color = data['color']
+        return t
+
+    def setProgram(self, program):
+        self.program = program
+        self.setScale(self.scale)
+        for fi in program:
+            self.color = fi.frame.timeline_color
+            break
+
+    def setMonitor(self, monitor):
+        self.monitor = monitor
+        self.updateMonitor()
+
+    def updateMonitor(self, update_frame=True):
+        if not self.monitor:
+            return
+        if update_frame and self.current_frame:
+            self.monitor.setFrame(self.current_frame.frame)
+        self.monitor.setTimecode(self.start_time, self.current_time, self.end_time)
+        screen = self.monitor.editor.screen
+        if self.current_frame:
+            screen.md_segment.set_text(str(self.current_frame.segment_index+1))
+            screen.md_type.set_text(self.current_frame.segment.__class__.__name__)
+            if hasattr(self.current_frame.segment, 'source'):
+                screen.md_source.set_text(self.current_frame.segment.source.title)
+            else:
+                screen.md_source.set_text('')
+            screen.md_segment_start.set_text('%0.6f' % (self.current_frame.segment.start))
+            screen.md_segment_end.set_text('%0.6f' % (self.current_frame.segment.end))
+            screen.md_segment_duration.set_text('%0.6f' % (self.current_frame.segment.duration))
+            screen.md_frame.set_text(str(self.current_frame.frame_index+1))
+            screen.md_cursor.set_text(self.current_frame.segment.visible_cursor and 'visible' or 'hidden')
+
+    def setScale(self, scale):
+        self.scale = scale
+        count = int(math.ceil(self.program.length / self.scale))
+        self.framecounts = [0 for x in range(count)]
+        self.framecolors = ['' for x in range(count)]
+        elapsed = 0.0
+        for fi in self.program:
+            pos = int(math.floor(fi.timecode / self.scale))
+            self.framecounts[pos] += 1
+            self.framecolors[pos] = fi.frame.timeline_color
+        for i in range(len(self.framecolors)):
+            if i and not self.framecolors[i]:
+                self.framecolors[i] = self.framecolors[i-1]
+        self.set_text('')
+
+    def pack(self, size, focus=False):
+        self.log.debug("pack %s %s", size, focus)
+
+    def rows(self, size, focus=False):
+        return 1
+
+    def render(self, size, focus=False):
+        title = '%-10s' % self.program.title[:10]
+        title_len = len(title)
+        text_attr = self.color + '-text'
+        s = [(text_attr, title)]
+        current_pos = int(math.floor(self.current_time / self.scale))
+        start_pos = end_pos = current_pos
+
+        range_points = 0
+        if self.start_time is not None:
+            start_pos = int(math.floor(self.start_time / self.scale))
+            range_points += 1
+        if self.end_time is not None:
+            end_pos = int(math.floor(self.end_time / self.scale))
+            range_points += 1
+        selection_range = sorted([start_pos, end_pos])
+
+        self.current_width = size[0]-title_len-2
+        if current_pos > self.current_width+self.hoffset-1:
+            self.hoffset = current_pos-self.current_width+1
+        if current_pos < self.hoffset:
+            self.hoffset = current_pos
+        left_arrow = self.hoffset>0 and '<' or ' '
+        right_arrow = self.hoffset+self.current_width<len(self.framecounts) and '>' or ' '
+        s.append((text_attr, left_arrow))
+        for i in range(self.hoffset, self.hoffset+self.current_width):
+            if i < len(self.framecounts):
+                if self.framecounts[i] > 1:
+                    char = '•'  #▪▬■·•‧
+                elif self.framecounts[i] > 0:
+                    char = '‧'
+                else:
+                    char = ' '
+                attr = self.framecolors[i] or self.color
+            else:
+                char = ' '
+                attr = ''
+            if selection_range[0] <= i < selection_range[1]:
+                if range_points == 2 and i == current_pos:
+                    pass
+                else:
+                    attr += '-selection'
+            elif i == current_pos:
+                attr += '-selection'
+            s.append((attr, char))
+        s.append((text_attr, right_arrow))
+        self.set_text(s)
+        return super(Timeline, self).render(size, focus)
+
+    def updateCurrentFrame(self):
+        pass
+
+    def move(self, offset):
+        self.log.debug('move %s time %s', offset, self.current_time)
+        if abs(offset) >= 1:
+            new_time = self.current_time + (offset * self.scale)
+        else:
+            new_time = self.current_time + offset
+        new_time = max(0.0, min(self.program.length, new_time))
+        if abs(offset) >= 1:
+            new_time = math.floor(new_time / self.scale) * self.scale
+        # Find the closest frame no later than the new time
+        (prv, cur, nxt) = self.program.getFramesAtTimecode(new_time)
+        self.log.debug('move %s %s %s', prv, cur, nxt)
+        self.current_time = new_time
+        if cur is None:
+            if prv is None:
+                self.current_frame = None
+            else:
+                self.current_frame = prv
+        else:
+            self.current_frame = cur
+            # If our cell has at least one frame in it, jump ahead to the
+            # first frame.
+            if abs(offset) >= 1 and self.current_time > cur.timecode and nxt:
+                if self.current_time + self.scale > nxt.timecode:
+                    self.current_time = nxt.timecode
+                    self.current_frame = nxt
+        self.updateMonitor()
+        self.set_text('')
+        self.log.debug('move %s time %s', offset, self.current_time)
+
+    def setStart(self):
+        self.start_time = self.current_time
+        self.set_text('')
+        self.updateMonitor(update_frame=False)
+
+    def setEnd(self):
+        if self.current_time + self.scale > self.program.length:
+            # If we're in the last cell, the user probably meant to go
+            # to the end.
+            self.end_time = self.program.length
+        else:
+            self.end_time = self.current_time
+        self.set_text('')
+        self.updateMonitor(update_frame=False)
+
+    def clearSelection(self):
+        self.start_time = None
+        self.end_time = None
+        self.set_text('')
+        self.updateMonitor(update_frame=False)
+
+    # Edit
+    def cut(self):
+        self.log.debug("cut")
+        if self.start_time is None or self.end_time is None:
+            return
+        self.monitor.editor.saveUndo("Cut", (self.program,))
+        saved = self.program.cut(self.start_time, self.end_time)
+        self.monitor.editor.setClipboard(saved)
+        if self.current_time > self.end_time:
+            self.current_time -= (self.end_time - self.start_time)
+        elif self.current_time > self.start_time:
+            self.current_time = self.start_time
+        self.clearSelection()
+        self.setScale(self.scale)
+        self.move(0)
+
+    def insert(self):
+        self.log.debug("insert")
+        if self.monitor.editor.clipboard is None:
+            return
+        self.monitor.editor.saveUndo("Insert", (self.program,))
+        self.program.insert(self.current_time, self.monitor.editor.clipboard)
+        self.setScale(self.scale)
+        self.move(0)
+
+    def append(self):
+        self.log.debug("append")
+        if self.monitor.editor.clipboard is None:
+            return
+        self.monitor.editor.saveUndo("Append", (self.program,))
+        self.program.append(self.monitor.editor.clipboard)
+        self.setScale(self.scale)
+        self.move(0)
+
+    def dissolve(self):
+        self.log.debug("dissolve")
+        if self.start_time is None or self.end_time is None:
+            return
+        self.monitor.editor.saveUndo("Dissolve", (self.program,))
+        try:
+            self.program.dissolve(self.start_time, self.end_time)
+            self.clearSelection()
+            self.setScale(self.scale)
+            self.move(0)
+        except Exception as e:
+            self.monitor.editor.undo()
+            self.monitor.editor.message("Error", str(e))
+
+    def toggleCursor(self):
+        self.log.debug("cursor")
+        self.monitor.editor.saveUndo("Toggle Cursor", (self.program,))
+        self.current_frame.segment.visible_cursor = not self.current_frame.segment.visible_cursor
+        self.move(0)
+
+    # Playback
+    def play(self):
+        self.log.debug("play")
+        self.playing = True
+        if self.end_time is not None:
+            end = self.end_time
+        else:
+            end = self.program.length
+        if self.start_time is not None:
+            start = self.start_time
+        else:
+            if self.current_time == end:
+                start = 0.0
+            else:
+                start = self.current_time
+        self.play_queue.put((start, end))
+
+    def stop(self):
+        self.log.debug("stop")
+        self.playing = False
+
+    # Playback thread
+    def run(self):
+        while True:
+            item = self.play_queue.get()
+            if item is None:
+                return
+            self._runPlay(item)
+            self.playing = False
+
+    def _runClock(self, start_wallclock_time, start_timecode, end_delay):
+        while True:
+            if not self.playing: return
+            cur_wallclock_time = time.time()
+            if cur_wallclock_time >= end_delay: break
+            elapsed_wallclock_time = cur_wallclock_time - start_wallclock_time
+            self.current_time = start_timecode + elapsed_wallclock_time
+            self.updateMonitor(update_frame=False)
+            self.set_text('')
+            self.monitor.editor.loop.draw_screen()
+            time.sleep(0)
+
+    def _runPlay(self, item):
+        start_timecode, end_timecode = item
+        self.log.debug("play %s %s", start_timecode, end_timecode)
+        self.current_time = start_timecode
+        self.move(0)
+        self.monitor.editor.loop.draw_screen()
+        start_wallclock_time = time.time()
+        first = True
+        for fi in self.program.getFrames(start_timecode, end_timecode):
+            end_delay = start_wallclock_time + fi.timecode - start_timecode
+            self._runClock(start_wallclock_time, start_timecode, end_delay)
+            if not self.playing: return
+            self.current_frame = fi
+            if not first:
+                self.monitor.setFrame(self.current_frame.frame)
+                self.monitor.editor.loop.draw_screen()
+            else:
+                first = False
+        end_delay = start_wallclock_time + end_timecode - start_timecode
+        self._runClock(start_wallclock_time, start_timecode, end_delay)
+        if not self.playing: return
+        self.current_time = end_timecode
+        self.updateMonitor()
+        self.monitor.editor.loop.draw_screen()
+        self.log.debug("done play %s", self.current_time)
+
+    def keypress(self, size, key):
+        self.log.debug(repr(key))
+        if self.playing and key != ' ':
+            return None
+        if key == (' '):
+            if self.playing:
+                self.stop()
+            else:
+                self.play()
+        elif key == '[':
+            self.setStart()
+        elif key == ']':
+            self.setEnd()
+        elif key == 'esc':
+            self.clearSelection()
+        elif key == 'right':
+            self.move(1)
+        elif key == 'meta right':
+            self.move(10)
+        elif key == 'shift right':
+            self.move(0.01)
+        elif key == 'left':
+            self.move(-1)
+        elif key == 'meta left':
+            self.move(-10)
+        elif key == 'shift left':
+            self.move(-0.01)
+        elif key == '=':
+            self.setScale(self.scale / 2)
+        elif key == '-':
+            self.setScale(self.scale * 2)
+        elif key == 'x':
+            self.cut()
+        elif key == 'i':
+            self.insert()
+        elif key == 'a':
+            self.append()
+        elif key == 'd':
+            self.dissolve()
+        elif key == 'C':
+            self.toggleCursor()
+        elif key == 'ctrl r':
+            self.monitor.editor.render(self.program)
+        return key
+
+class Screen(urwid.WidgetWrap):
+    def __init__(self, editor, size):
+        super(Screen, self).__init__(urwid.Pile([]))
+        self.log = logging.getLogger('screen')
+        self.editor = editor
+        self.size = size
+
+        self.monitor = Monitor(editor, self.size)
+        self.start_timecode = urwid.Text('00:00:00.000000', align='center')
+        self.timecode = urwid.Text('00:00:00.000000', align='center')
+        self.end_timecode = urwid.Text('00:00:00.000000', align='center')
+        self.timecode_cols = urwid.Columns([
+            ('weight', 1, urwid.Text(' ')),
+            (15, self.start_timecode),
+            (17, urwid.Text(' ')),
+            (15, self.timecode),
+            (17, urwid.Text(' ')),
+            (15, self.end_timecode),
+            ('weight', 1, urwid.Text(' ')),
+            ])
+        self.timeline = None
+        self.md_segment = urwid.Text('')
+        self.md_type = urwid.Text('')
+        self.md_source = urwid.Text('')
+        self.md_segment_start = urwid.Text('')
+        self.md_segment_end = urwid.Text('')
+        self.md_segment_duration = urwid.Text('')
+        self.md_frame = urwid.Text('')
+        self.md_cursor = urwid.Text('')
+        metadata_pile = urwid.Pile([
+            ('pack', urwid.Columns([(11, urwid.Text('Segment: ')),   ('weight', 1, self.md_segment)])),
+            ('pack', urwid.Columns([(11, urwid.Text('Type: ')),     ('weight', 1, self.md_type)])),
+            ('pack', urwid.Columns([(11, urwid.Text('Source: ')),   ('weight', 1, self.md_source)])),
+            ('pack', urwid.Columns([(11, urwid.Text('Start: ')), ('weight', 1, self.md_segment_start)])),
+            ('pack', urwid.Columns([(11, urwid.Text('End: ')), ('weight', 1, self.md_segment_end)])),
+            ('pack', urwid.Columns([(11, urwid.Text('Duration: ')), ('weight', 1, self.md_segment_duration)])),
+            ('pack', urwid.Columns([(11, urwid.Text('Frame: ')),     ('weight', 1, self.md_frame)])),
+            ('pack', urwid.Columns([(11, urwid.Text('Cursor: ')),     ('weight', 1, self.md_cursor)])),
+        ])
+        program_box = urwid.LineBox(self.monitor, "Monitor")
+        metadata_box = urwid.LineBox(metadata_pile)
+        border = 2
+        monitor_columns = urwid.Columns([
+            #('weight', 1, urwid.Filler(urwid.Text(''))),
+            (self.size[0]+border, program_box),
+            metadata_box,
+            #('weight', 1, urwid.Filler(urwid.Text(''))),
+            ])
+        lw = urwid.SimpleFocusListWalker([])
+        self.timelines = urwid.ListBox(lw)
+        urwid.connect_signal(lw, 'modified', self._updateFocus)
+        self.main = urwid.Pile([])
+        self.main.contents.append((monitor_columns, ('given', self.size[1]+border)))
+        self.main.contents.append((self.timecode_cols, ('pack', None)))
+        self.main.contents.append((self.timelines, ('weight', 1)))
+        self.main.contents.append((urwid.Filler(urwid.Text(u'')), ('weight', 1)))
+        self.main.set_focus(2)
+
+        self._w.contents.append((self.main, ('weight', 1)))
+        self._w.set_focus(0)
+
+    def addTimeline(self, program, timeline=None):
+        if timeline is None:
+            timeline = Timeline()
+        timeline.setProgram(program)
+        timeline.setMonitor(self.monitor)
+        w = urwid.AttrMap(timeline, None, focus_map=FOCUS_MAP)
+        self.timelines.body.append(w)
+        self.timeline = timeline
+        self.timelines.set_focus(len(self.timelines.body)-1)
+
+    def getTimelines(self):
+        for w in self.timelines.body:
+            yield w.original_widget
+
+    def removeTimeline(self, timeline):
+        if timeline == self.timeline:
+            self.timeline = None
+        for w in self.timelines.body:
+            if w.original_widget == timeline:
+                self.timelines.body.remove(w)
+                return
+
+    def _updateFocus(self):
+        self.log.debug("update focus")
+        if self.timeline:
+            self.log.debug("clear monitor %s", self.timeline)
+            self.timeline.setMonitor(None)
+        if self.timelines.focus:
+            self.timeline = self.timelines.focus.original_widget
+            self.log.debug("set focus %s", self.timeline)
+            self.timeline.setMonitor(self.monitor)
+            self.log.debug("set monitor %s", self.timeline)
+        else:
+            self.log.debug("no timeline in focus")
+
+    def keypress(self, size, key):
+        self.log.debug(repr(key))
+        if self.timeline and self.timeline.playing and key != ' ':
+            return None
+        if key == 'ctrl l':
+            self.editor.load()
+        elif key == 'ctrl o':
+            self.editor.open()
+        elif key == 'ctrl _':
+            self.editor.undo()
+        elif key == 'ctrl s':
+            self.editor.save()
+        return super(Screen, self).keypress(size, key)
+
+class MainLoop(urwid.MainLoop):
+    def __init__(self, *args, **kw):
+        self._screen_lock = threading.RLock()
+        super(MainLoop, self).__init__(*args, **kw)
+
+    def draw_screen(self):
+        with self._screen_lock:
+            super(MainLoop, self).draw_screen()
+
+class UndoRecord:
+    def __init__(self, description, programs):
+        self.description = description
+        self.programs = programs
+
+class FixedButton(urwid.Button):
+    def sizing(self):
+        return frozenset([urwid.FIXED])
+
+    def pack(self, size, focus=False):
+        return (len(self.get_label())+4, 1)
+
+class LoadDialog(urwid.WidgetWrap):
+    def __init__(self, editor):
+        self.editor = editor
+        self.ok = FixedButton("Load")
+        self.cancel = FixedButton("Cancel")
+        urwid.connect_signal(self.ok, 'click', editor._finishLoad, self)
+        urwid.connect_signal(self.cancel, 'click', editor._clearPopup, self)
+
+        file_types = []
+        self.type_buttons = []
+        self.button_types = {}
+        for ft in editty.source.all_types:
+            b = urwid.RadioButton(file_types, ft.name)
+            self.type_buttons.append(b)
+            self.button_types[b] = ft
+        for b in self.type_buttons:
+            urwid.connect_signal(b, 'postchange', self.setType)
+        self.current_type = None
+
+        buttons = urwid.Columns([
+            ('pack', self.ok),
+            ('pack', urwid.Text(' ')),
+            ('pack', self.cancel),
+            ])
+        self.stream_file = urwid.Edit("")
+        self.timing_file = urwid.Edit("Timing file: ")
+        self.listbox = urwid.ListBox([
+            urwid.Text('File type:'),
+            ] + self.type_buttons + [
+            urwid.Text(''),
+            self.stream_file,
+            urwid.Text(''),
+            buttons,
+            ])
+        self.setType(self.current_type, self)
+        super(LoadDialog, self).__init__(urwid.LineBox(self.listbox, 'Load'))
+
+    def setType(self, button, dialog):
+        # Only handle the second event
+        selected = [b for b in self.type_buttons if b.state]
+        if len(selected) > 1:
+            return
+
+        selected = selected[0]
+        self.current_type = self.button_types[selected]
+
+        if not self.current_type.timing:
+            if self.timing_file in self.listbox.body:
+                self.listbox.body.remove(self.timing_file)
+        else:
+            if self.timing_file not in self.listbox.body:
+                loc = self.listbox.body.index(self.stream_file)
+                self.listbox.body.insert(loc+1, self.timing_file)
+        self.stream_file.set_caption('%s file: ' % self.current_type.name)
+
+    def keypress(self, size, key):
+        if key == 'esc':
+            self.editor._clearPopup()
+            return None
+        if key == 'enter':
+            if(self.current_type.timing and
+               self.listbox.focus is self.stream_file):
+                return self.keypress(size, 'down')
+            if(self.listbox.focus is self.timing_file or
+               self.listbox.focus is self.stream_file):
+                return self.ok.keypress(size, key)
+        return super(LoadDialog, self).keypress(size, key)
+
+class SaveDialog(urwid.WidgetWrap):
+    def __init__(self, editor):
+        self.editor = editor
+        self.ok = FixedButton("Save")
+        self.cancel = FixedButton("Cancel")
+        urwid.connect_signal(self.ok, 'click', editor._finishSave, self)
+        urwid.connect_signal(self.cancel, 'click', editor._clearPopup, self)
+        buttons = urwid.Columns([
+            ('pack', self.ok),
+            ('pack', urwid.Text(' ')),
+            ('pack', self.cancel),
+            ])
+        self.project_file = urwid.Edit("Project file: ")
+        self.listbox = urwid.ListBox([
+            self.project_file,
+            urwid.Text(''),
+            buttons,
+            ])
+        super(SaveDialog, self).__init__(urwid.LineBox(self.listbox, 'Save'))
+
+    def keypress(self, size, key):
+        if key == 'esc':
+            self.editor._clearPopup()
+            return None
+        if key == 'enter':
+            if(self.listbox.focus is self.project_file):
+                return self.ok.keypress(size, key)
+        return super(SaveDialog, self).keypress(size, key)
+
+class OpenDialog(urwid.WidgetWrap):
+    def __init__(self, editor):
+        self.editor = editor
+        self.ok = FixedButton("Open")
+        self.cancel = FixedButton("Cancel")
+        urwid.connect_signal(self.ok, 'click', editor._finishOpen, self)
+        urwid.connect_signal(self.cancel, 'click', editor._clearPopup, self)
+        buttons = urwid.Columns([
+            ('pack', self.ok),
+            ('pack', urwid.Text(' ')),
+            ('pack', self.cancel),
+            ])
+        self.project_file = urwid.Edit("Project file: ")
+        self.listbox = urwid.ListBox([
+            self.project_file,
+            urwid.Text(''),
+            buttons,
+            ])
+        super(OpenDialog, self).__init__(urwid.LineBox(self.listbox, 'Open'))
+
+    def keypress(self, size, key):
+        if key == 'esc':
+            self.editor._clearPopup()
+            return None
+        if key == 'enter':
+            if(self.listbox.focus is self.project_file):
+                return self.ok.keypress(size, key)
+        return super(OpenDialog, self).keypress(size, key)
+
+class RenderDialog(urwid.WidgetWrap):
+    def __init__(self, editor, program):
+        self.editor = editor
+        self.program = program
+        self.ok = FixedButton("Render")
+        self.cancel = FixedButton("Cancel")
+        urwid.connect_signal(self.ok, 'click', editor._finishRender, self)
+        urwid.connect_signal(self.cancel, 'click', editor._clearPopup, self)
+        buttons = urwid.Columns([
+            ('pack', self.ok),
+            ('pack', urwid.Text(' ')),
+            ('pack', self.cancel),
+            ])
+        self.ttyrec_file = urwid.Edit("Ttyrec file: ")
+        self.listbox = urwid.ListBox([
+            self.ttyrec_file,
+            urwid.Text(''),
+            buttons,
+            ])
+        super(RenderDialog, self).__init__(urwid.LineBox(self.listbox, 'Render'))
+
+    def keypress(self, size, key):
+        if key == 'esc':
+            self.editor._clearPopup()
+            return None
+        if key == 'enter':
+            if(self.listbox.focus is self.ttyrec_file):
+                return self.ok.keypress(size, key)
+        return super(RenderDialog, self).keypress(size, key)
+
+class QuitDialog(urwid.WidgetWrap):
+    def __init__(self, editor):
+        self.editor = editor
+        self.yes = FixedButton("Yes")
+        self.no = FixedButton("No")
+        urwid.connect_signal(self.yes, 'click', editor._quit, self)
+        urwid.connect_signal(self.no, 'click', editor._clearPopup, self)
+        buttons = urwid.Columns([
+            ('pack', self.yes),
+            ('pack', urwid.Text(' ')),
+            ('pack', self.no),
+            ])
+        self.listbox = urwid.ListBox([
+            urwid.Text('Are you sure you want to quit?\n'),
+            buttons,
+            ])
+        super().__init__(urwid.LineBox(self.listbox, 'Quit'))
+
+    def keypress(self, size, key):
+        if key == 'esc':
+            self.editor._clearPopup()
+            return None
+        return super().keypress(size, key)
+
+class MessageDialog(urwid.WidgetWrap):
+    def __init__(self, editor, title, message):
+        self.editor = editor
+        ok = FixedButton("OK")
+        urwid.connect_signal(ok, 'click', editor._clearPopup, self)
+        buttons = urwid.Columns([
+            ('pack', ok),
+            ])
+        listbox = urwid.ListBox([
+            urwid.Text(message),
+            urwid.Text(''),
+            buttons,
+            ])
+        super(MessageDialog, self).__init__(urwid.LineBox(listbox, title))
+
+    def keypress(self, size, key):
+        if key == 'esc':
+            self.editor._clearPopup()
+            return None
+        return super().keypress(size, key)
+
+class Editor(object):
+    def __init__(self, args):
+        self.size = (args.width, args.height)
+        if args.debuglog:
+            logfile = os.path.expanduser(args.debuglog)
+            logging.basicConfig(filename=logfile, level=logging.DEBUG)
+        self.log = logging.getLogger('editor')
+        self.screen = Screen(self, self.size)
+        self.loop = MainLoop(self.screen, palette=PALETTE,
+                             unhandled_input=self.unhandledInput)
+        self.loop.screen.tty_signal_keys(start='undefined', stop='undefined')
+        self.loop.screen.set_terminal_properties(colors=256)
+        self.loop.screen.start()
+        self.clipboard = None
+        self.programs = []
+        self.undo_history = []
+        self.timeline_color_generator = self._timelineColorGenerator()
+        self.output_program = Program('Output')
+        if args.project:
+            self._open(args.project)
+
+    def _timelineColorGenerator(self):
+        while True:
+            for i in range(1, 5):
+                yield 'timeline-%i' % i
+
+    def setSize(self, size):
+        self.size = size
+        self.screen = Screen(self, self.size)
+        self.loop.widget = self.screen
+
+    def help(self):
+        msg = ('Use the arrow keys to move left and right in the timeline. '
+               'Use meta-arrows to move longer distances and shift-arrows '
+               'to move shorter distances.\n\n')
+        for key, desc in [
+                ('CTRL-l', 'Load terminal recording'),
+                ('CTRL-o', 'Open Editty program file'),
+                ('CTRL-s', 'Save Editty program file'),
+                ('CTRL-r', 'Render'),
+                ('CTRL-_', 'Undo'),
+                ('CTRL-q', 'Quit'),
+                ('SPACE', 'Play'),
+                ('[',   'Set selection start'),
+                (']',   'Set selection end'),
+                ('ESC', 'Clear start/end points'),
+                ('ARROW', 'Move left/right'),
+                ('META-ARROW', 'Move 10x left/right'),
+                ('SHIFT-ARROW', 'Move 0.01x left/right'),
+                ('=',   'Zoom in timescale'),
+                ('-',   'Zoom out timescale'),
+                ('x',   'Cut selection to clipboard'),
+                ('a',   'Append clipboard contents to end of timeline'),
+                ('i',   'Insert clipboard contents to end of timeline'),
+                ('d',   'Dissolve between start and end of selection'),
+                ('C',   'Toggle whether cursor is visible in this segment'),
+                ]:
+            msg += '%-11s %s\n' % (key, desc)
+        self.message("Help", msg, min_width=60, width=30, height=50)
+
+    def unhandledInput(self, key):
+        if key == 'f1':
+            self.help()
+        elif key == 'ctrl q':
+            self.quit()
+
+    def quit(self):
+        dialog = QuitDialog(self)
+        self.screen.monitor.off = True
+        overlay = urwid.Overlay(dialog, self.screen,
+                                'center', ('relative', 50),
+                                'middle', ('relative', 25))
+        self.loop.widget = overlay
+
+    def _quit(self, *args, **kw):
+        raise urwid.ExitMainLoop()
+
+    def saveUndo(self, description, programs):
+        # Make an undo record, programs is a list of programs which
+        # are about to change.
+        saved_programs = []
+        program_timelines = {}
+        for timeline in self.screen.getTimelines():
+            self.log.debug("save undo %s %s", timeline.program, timeline.uuid)
+            if timeline.program:
+                program_timelines[timeline.program] = timeline.uuid
+        for p in self.programs:
+            timeline_uuid = program_timelines.get(p)
+            if p in programs:
+                p = p.copy()
+            saved_programs.append((p, timeline_uuid))
+        ur = UndoRecord(description, saved_programs)
+        self.undo_history.append(ur)
+
+    def undo(self):
+        undorecord = self.undo_history.pop()
+        current_timelines = set(self.screen.getTimelines())
+        self.programs = []
+        self.log.debug("undo %s", undorecord.description)
+        self.log.debug("undo %s", undorecord.programs)
+        self.log.debug("current %s", current_timelines)
+        for (program, timeline_uuid) in undorecord.programs:
+            self.programs.append(program)
+            for t in current_timelines:
+                self.log.debug("undo %s %s", t.uuid, timeline_uuid)
+                if t.uuid == timeline_uuid:
+                    self.log.debug("found")
+                    current_timelines.remove(t)
+                    t.setProgram(program)
+                    break
+            else:
+                self.log.debug("undo added new timeline for %s", program)
+                self.screen.addTimeline(program)
+        for t in current_timelines:
+            self.log.debug("removed unused timeline %s", t)
+            self.screen.removeTimeline(t)
+
+    def setClipboard(self, program):
+        self.clipboard = program
+
+    def run(self):
+        self.loop.run()
+
+    def _clearPopup(self, *args, **kw):
+        self.screen.monitor.off = False
+        self.loop.widget = self.screen
+        self.loop.draw_screen()
+
+    def message(self, title, message, width=50, height=25,
+                min_width=None, min_height=None):
+        dialog = MessageDialog(self, title, message)
+        self.screen.monitor.off = True
+        overlay = urwid.Overlay(dialog, self.screen,
+                                'center', ('relative', width),
+                                'middle', ('relative', height),
+                                min_width=min_width,
+                                min_height=min_height)
+
+        self.loop.widget = overlay
+
+    def load(self):
+        dialog = LoadDialog(self)
+        self.screen.monitor.off = True
+        overlay = urwid.Overlay(dialog, self.screen,
+                                'center', ('relative', 50),
+                                'middle', ('relative', 25))
+        self.loop.widget = overlay
+
+    def _load(self, file_type, stream_file, timing_file, program=None):
+        color = next(self.timeline_color_generator)
+        source = file_type.load(self.size, stream_file, timing_file, color)
+        if program is None:
+            program = Program(source.title)
+        program.append(Clip(source, 0.0, source.length))
+        self.saveUndo("Load %s" % stream_file, [])
+        self.programs.append(program)
+        self.screen.addTimeline(program)
+
+    def _finishLoad(self, button, dialog):
+        self._clearPopup()
+        try:
+            self._load(dialog.current_type,
+                       dialog.stream_file.edit_text,
+                       dialog.timing_file.edit_text)
+        except Exception as e:
+            self.message("Error", str(e))
+
+    def save(self):
+        dialog = SaveDialog(self)
+        self.screen.monitor.off = True
+        overlay = urwid.Overlay(dialog, self.screen,
+                                'center', ('relative', 50),
+                                'middle', ('relative', 25))
+        self.loop.widget = overlay
+
+    def _save(self, project_file):
+        data = {'version': 1}
+        data['size'] = self.size
+        data['sources'] = []
+        data['programs'] = []
+        data['timelines'] = []
+        sources = set()
+        programs = set()
+        for timeline in self.screen.getTimelines():
+            data['timelines'].append(timeline.toJSON())
+            if timeline.program:
+                programs.add(timeline.program)
+        for program in programs:
+            data['programs'].append(program.toJSON())
+            for segment in program.segments:
+                if hasattr(segment, 'source'):
+                    sources.add(segment.source)
+        for source in sources:
+            data['sources'].append(source.toJSON())
+        with open(project_file, 'w') as f:
+            f.write(json.dumps(data))
+
+    def _finishSave(self, button, dialog):
+        pf = dialog.project_file.edit_text
+        self._clearPopup()
+        self.log.debug("save %s", pf)
+        try:
+            self._save(pf)
+        except Exception as e:
+            self.message("Error", str(e))
+
+    def open(self):
+        dialog = OpenDialog(self)
+        self.screen.monitor.off = True
+        overlay = urwid.Overlay(dialog, self.screen,
+                                'center', ('relative', 50),
+                                'middle', ('relative', 25))
+        self.loop.widget = overlay
+
+    def _open(self, project_file):
+        with open(project_file, 'r') as f:
+            data = json.loads(f.read())
+
+        for timeline in list(self.screen.getTimelines()):
+            self.screen.removeTimeline(timeline)
+        size = data['size']
+        self.setSize(size)
+        sources = {}
+        for source in data['sources']:
+            sc = editty.source.SourceClip.fromJSON(source)
+            sources[sc.uuid] = sc
+        programs = {}
+        for program in data['programs']:
+            p = Program.fromJSON(program, sources)
+            programs[p.uuid] = p
+            self.programs.append(p)
+        for timeline in data['timelines']:
+            t = Timeline.fromJSON(timeline)
+            program = programs.get(timeline['program'])
+            self.screen.addTimeline(program, timeline=t)
+
+    def _finishOpen(self, button, dialog):
+        pf = dialog.project_file.edit_text
+        self._clearPopup()
+        self.log.debug("open %s", pf)
+        try:
+            self._open(pf)
+        except Exception as e:
+            self.message("Error", str(e))
+
+    def render(self, program):
+        dialog = RenderDialog(self, program)
+        self.screen.monitor.off = True
+        overlay = urwid.Overlay(dialog, self.screen,
+                                'center', ('relative', 50),
+                                'middle', ('relative', 25))
+        self.loop.widget = overlay
+
+    def _render(self, ttyrec, program):
+        program.render_ttyrec(self.size, ttyrec)
+
+    def _finishRender(self, button, dialog):
+        tf = dialog.ttyrec_file.edit_text
+        program = dialog.program
+        self._clearPopup()
+        self.log.debug("render %s", tf)
+        try:
+            self._render(tf, program)
+        except Exception as e:
+            self.message("Error", str(e))
+
+def main():
+    parser = argparse.ArgumentParser(
+        description='')
+    parser.add_argument('--width', type=int, default=80,
+                        help='Screen width')
+    parser.add_argument('--height', type=int, default=24,
+                        help='Screen height')
+    parser.add_argument('--debuglog',
+                        help='Debug log file path')
+    parser.add_argument('project', nargs='?',
+                        help='project file')
+    args = parser.parse_args()
+    e = Editor(args)
+    e.run()
diff --git a/editty/program.py b/editty/program.py
new file mode 100644
index 0000000..f73e263
--- /dev/null
+++ b/editty/program.py
@@ -0,0 +1,388 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2019 James E. Blair <corvus@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import logging
+import tempfile
+import struct
+import uuid
+
+from editty.segment import *
+
+class FrameInfo:
+    def __init__(self, **kw):
+        self.__dict__.update(kw)
+
+class Program:
+    def __init__(self, title='Untitled'):
+        self.log = logging.getLogger('program')
+        self.title = title
+        self.segments = []
+        self.length = 0.0
+        self.uuid = str(uuid.uuid4())
+
+    def toJSON(self):
+        return dict(uuid=self.uuid,
+                    title=self.title,
+                    segments=[x.toJSON() for x in self.segments])
+
+    @classmethod
+    def fromJSON(cls, data, sources):
+        p = Program(data['title'])
+        p.uuid = data['uuid']
+        for segment in data['segments']:
+            log = logging.getLogger('program')
+            log.debug(segment)
+            p.append(Segment.fromJSON(segment, sources))
+        return p
+
+    def copy(self):
+        p = Program()
+        p.title = self.title
+        p.segments = [s.copy() for s in self.segments]
+        p.length = self.length
+        return p
+
+    def cut(self, start, end):
+        self.log.debug("cut %s %s", start, end)
+        elapsed = 0.0
+        cut_program = Program("Cut of %s" % self.title)
+        for segment in self.segments[:]:
+            segment_start = elapsed
+            segment_end = segment_start + segment.duration
+            segment_duration = segment.duration
+            self.log.debug("consider segment %s %s %s", segment, segment_start, segment_end)
+            #    [xxx]
+            #[===========]
+            if segment_start < start and segment_end > end:
+                # The segment should be split and the middle removed
+                self.log.debug("split and remove segment %s" % segment)
+                # Save it for the clipboard
+                clipboard_copy = segment.copy()
+                clipboard_copy.start += start - segment_start
+                clipboard_copy.end -= segment_end - end
+                cut_program.append(clipboard_copy)
+                # Make the cut
+                segment_index = self.segments.index(segment)
+                new_segment = segment.copy()
+                self.segments.insert(segment_index+1, new_segment)
+                segment.end -= segment_end - start
+                new_segment.start += end - segment_start
+                # No more segments apply
+                break
+            #    [xxxxxxxxxxx]
+            #[-----][=====][-----]
+            #       [xxxxx]
+            #[-----][=====][-----]
+            elif segment_start >= start and segment_end <= end:
+                # The entire segment should be removed
+                self.log.debug("remove segment %s" % segment)
+                # Save it for the clipboard
+                clipboard_copy = segment.copy()
+                cut_program.append(clipboard_copy)
+                # Make the cut
+                self.segments.remove(segment)
+            #           [xxxx]
+            #[-----][=====][-----]
+            #          [xx]
+            #[-----][=====][-----]
+            elif segment_start < start and segment_end >= start:
+                # TODO: if segment_end == start, we may not need this segment in some cases
+                # Move back the end of this segment
+                delta = segment_end - start
+                self.log.debug("move end of segment %s %s", segment, delta)
+                # Save it for the clipboard
+                clipboard_copy = segment.copy()
+                clipboard_copy.start += start - segment_start
+                cut_program.append(clipboard_copy)
+                # Make the cut
+                segment.end -= delta
+            #    [xxxx]
+            #[-----][=====][-----]
+            #       [xx]
+            #[-----][=====][-----]
+            elif segment_end > end and segment_start <= end:
+                # TODO: if segment_start == end, we may not need this segment in some cases
+                # Move up the start of this segment
+                delta = end - segment_start
+                self.log.debug("move start of segment %s %s", segment, delta)
+                # Save it for the clipboard
+                clipboard_copy = segment.copy()
+                clipboard_copy.end -= segment_end - end
+                cut_program.append(clipboard_copy)
+                # Make the cut
+                segment.start += delta
+            elapsed += segment_duration
+        for segment in self.segments:
+            self.log.debug("segment %s %s %s", segment, segment.start, segment.end)
+        self.updateLength()
+        return cut_program
+
+    def insert(self, timecode, program):
+        self.log.debug("insert %s %s", timecode, program)
+        elapsed = 0.0
+        for segment in self.segments[:]:
+            segment_start = elapsed
+            segment_end = segment_start + segment.duration
+            self.log.debug("consider segment %s %s %s", segment, segment_start, segment_end)
+            #        [xx]
+            #[======]
+            if timecode > segment_end:
+                pass
+            elif timecode < segment_start:
+                pass
+            #    [xxx]
+            #[===========]
+            elif segment_start < timecode < segment_end:
+                # The segment should be split and the program inserted in the middle
+                self.log.debug("split and insert program %s" % segment)
+                segment_index = self.segments.index(segment)
+                new_segment = segment.copy()
+                segment.end -= segment_end - timecode
+                new_segment.start += timecode - segment_start
+                self.segments = (self.segments[:segment_index+1] +
+                                 program.segments +
+                                 [new_segment] +
+                                 self.segments[segment_index+1:])
+                # No more segments apply
+                break
+            #[xx]
+            #[=====]
+            elif segment_start == timecode:
+                # The program should be inserted before the current segment
+                self.log.debug("prepend segment %s" % segment)
+                segment_index = self.segments.index(segment)
+                self.segments = (self.segments[:segment_index] +
+                                 program.segments +
+                                 self.segments[segment_index:])
+                # No more segments apply
+                break
+            #      [xx]
+            #[=====]
+            elif segment_end == timecode:
+                # The program should be appended after the current segment
+                self.log.debug("append segment %s", segment)
+                segment_index = self.segments.index(segment)
+                self.segments = (self.segments[:segment_index+1] +
+                                 program.segments +
+                                 self.segments[segment_index+1:])
+                # No more segments apply
+                break
+            elapsed += segment.duration
+        for segment in self.segments:
+            self.log.debug("segment %s %s %s", segment, segment.start, segment.end)
+        self.updateLength()
+
+    def append(self, obj):
+        if isinstance(obj, Segment):
+            self.segments.append(obj)
+        elif isinstance(obj, Program):
+            self.segments.extend(obj.segments)
+        else:
+            raise Exception("Can not add %s to Program" % repr(obj))
+        self.updateLength()
+
+    def dissolve(self, start, end):
+        self.cut(start, end)
+        (prev_fi, cur_fi, next_fi) = self.getFramesAtTimecode(start)
+        if (not isinstance(prev_fi.segment, Clip) or
+            not isinstance(cur_fi.segment, Clip)):
+            raise Exception("Dissolve is only supported between two clips")
+        dis = Dissolve(prev_fi.segment.source,
+                       prev_fi.segment.end,
+                       cur_fi.segment.source,
+                       cur_fi.segment.start,
+                       end-start)
+        prog = Program()
+        prog.append(dis)
+        self.insert(start, prog)
+
+    def updateLength(self):
+        self.length = 0.0
+        for segment in self.segments:
+            self.length += segment.duration
+
+    def getFramesAtTimecode(self, timecode):
+        # Return the frame before, at, and after the timecode
+        prev_frame = None
+        cur_frame = None
+        next_frame = None
+        for fi in self:
+            if fi.timecode > timecode:
+                next_frame = fi
+                return (prev_frame, cur_frame, next_frame)
+            prev_frame = cur_frame
+            cur_frame = fi
+        return (prev_frame, cur_frame, next_frame)
+
+    def __iter__(self):
+        previous_segment_duration = 0.0
+        for si, segment in enumerate(self.segments):
+            for (fi, (timecode, frame)) in enumerate(segment):
+                yield FrameInfo(timecode=timecode + previous_segment_duration,
+                                frame_index=fi,
+                                segment_index=si,
+                                segment=segment,
+                                frame=frame)
+            previous_segment_duration += segment.duration
+
+    def getFrames(self, start, end):
+        for fi in self:
+            if end is not None and fi.timecode > end:
+                return
+            if start is not None and fi.timecode < start:
+                continue
+            start = None
+            yield fi
+
+    # TODO: this is currently unused
+    def render_script(self, size, stream_fn, timing_fn):
+        class LoadWidget(urwid.Widget):
+            term_modes = urwid.TermModes()
+            def beep(self): pass
+            def set_title(self, title): pass
+        class MyScreen(urwid.raw_display.Screen):
+            def signal_init(self): pass
+            def signal_restore(self): pass
+        canv = urwid.TermCanvas(size[0], size[1], LoadWidget())
+        canv.modes.main_charset = urwid.vterm.CHARSET_UTF8
+        with tempfile.TemporaryFile() as screen_in:
+            with open(stream_fn, 'w') as screen_out:
+                with open(timing_fn, 'w') as timing_out:
+                    screen_out.write("Rendered by Editty\n")
+                    screen = MyScreen(screen_in, screen_out)
+                    screen.start()
+                    elapsed = 0.0
+                    written = 0
+                    for fi in self:
+                        canv.term = [line[:] for line in fi.frame.content]
+                        canv.set_term_cursor(fi.frame.cursor[0], fi.frame.cursor[1])
+                        screen.draw_screen(size, canv)
+                        screen._screen_buf_canvas=None
+                        screen_out.flush()
+                        current_pos = screen_out.tell()
+                        delta_bytes = current_pos - written
+                        delta_time = fi.timecode - elapsed
+                        timing_out.write('%0.6f %i\n' % (delta_time, delta_bytes))
+                        written = current_pos
+                        elapsed = fi.timecode
+                    screen.stop()
+                    screen_out.write("\n\nRendered by Editty\n")
+
+    # TODO: this is currently unused
+    def render_asciicast(self, size, cast_fn):
+        class LoadWidget(urwid.Widget):
+            term_modes = urwid.TermModes()
+            def beep(self): pass
+            def set_title(self, title): pass
+        class MyScreen(urwid.raw_display.Screen):
+            def signal_init(self): pass
+            def signal_restore(self): pass
+        canv = urwid.TermCanvas(size[0], size[1], LoadWidget())
+        canv.modes.main_charset = urwid.vterm.CHARSET_UTF8
+        show_cursor_escape = urwid.escape.SHOW_CURSOR
+        outdata = dict(version=1,
+                       duration=self.length,
+                       title="",
+                       height=size[1],
+                       width=size[0],
+                       command=None,
+                       stdout=[])
+        stdout = outdata['stdout']
+        with tempfile.TemporaryFile() as screen_in:
+            with tempfile.TemporaryFile('w+') as screen_out:
+                with open(cast_fn, 'w') as cast_out:
+                    screen = MyScreen(screen_in, screen_out)
+                    screen.start()
+                    elapsed = 0.0
+                    for fi in self:
+                        canv.term = [line[:] for line in fi.frame.content]
+                        canv.set_term_cursor(fi.frame.cursor[0], fi.frame.cursor[1])
+                        if fi.segment.visible_cursor:
+                            urwid.escape.SHOW_CURSOR = show_cursor_escape
+                        else:
+                            urwid.escape.SHOW_CURSOR = ''
+                        screen.draw_screen(size, canv)
+                        screen._screen_buf_canvas=None
+                        screen_out.flush()
+                        delta_bytes = screen_out.tell()
+                        screen_out.seek(0)
+                        data = screen_out.read()
+                        self.log.debug("read %s chars %s bytes of %s" % (len(data), len(data.encode('utf8')), delta_bytes))
+                        screen_out.seek(0)
+                        screen_out.truncate()
+                        if len(data.encode('utf8')) != delta_bytes:
+                               raise Exception("Short read")
+                        delta_time = fi.timecode - elapsed
+                        stdout.append([delta_time, data])
+                        self.log.debug("frame %s %s", delta_time, len(data))
+                        elapsed = fi.timecode
+                    cast_out.write(json.dumps(outdata))
+                    screen.stop()
+        urwid.escape.SHOW_CURSOR = show_cursor_escape
+
+    def render_ttyrec(self, size, ttyrec_fn):
+        class LoadWidget(urwid.Widget):
+            term_modes = urwid.TermModes()
+            def beep(self): pass
+            def set_title(self, title): pass
+        class MyScreen(urwid.raw_display.Screen):
+            def signal_init(self): pass
+            def signal_restore(self): pass
+        canv = urwid.TermCanvas(size[0], size[1], LoadWidget())
+        canv.modes.main_charset = urwid.vterm.CHARSET_UTF8
+        show_cursor_escape = urwid.escape.SHOW_CURSOR
+        with tempfile.TemporaryFile() as screen_in:
+            with tempfile.TemporaryFile('w+') as screen_out:
+                with open(ttyrec_fn, 'wb') as ttyrec_out:
+                    screen = MyScreen(screen_in, screen_out)
+                    screen.start()
+                    first = True
+                    for fi in self:
+                        canv.term = [line[:] for line in fi.frame.content]
+                        canv.set_term_cursor(fi.frame.cursor[0], fi.frame.cursor[1])
+                        if fi.segment.visible_cursor:
+                            urwid.escape.SHOW_CURSOR = show_cursor_escape
+                        else:
+                            urwid.escape.SHOW_CURSOR = ''
+                        screen.draw_screen(size, canv)
+                        screen._screen_buf_canvas=None
+                        screen_out.flush()
+                        delta_bytes = screen_out.tell()
+                        screen_out.seek(0)
+                        data = screen_out.read()
+                        self.log.debug("read %s chars %s bytes of %s" % (len(data), len(data.encode('utf8')), delta_bytes))
+                        screen_out.seek(0)
+                        screen_out.truncate()
+                        if len(data.encode('utf8')) != delta_bytes:
+                               raise Exception("Short read")
+                        if first:
+                            prefix = '\x1b%%G\x1b[8;%s;%st' % (size[1], size[0])
+                            data = prefix + data
+                            first = False
+                        tc_secs, tc_usecs = map(int, ('%0.6f' % fi.timecode).split('.'))
+                        data = data.encode('utf8')
+                        ttyrec_out.write(struct.pack('<III',
+                                                     tc_secs, tc_usecs, len(data)))
+                        ttyrec_out.write(data)
+                        self.log.debug("frame %s %s %s", tc_secs, tc_usecs, len(data))
+                        elapsed = fi.timecode
+                    if elapsed < self.length:
+                        data = '\x1b[1;1H'.encode('utf8')
+                        tc_secs, tc_usecs = map(int, ('%0.6f' % self.length).split('.'))
+                        ttyrec_out.write(struct.pack('<III',
+                                                     tc_secs, tc_usecs, 0))
+                    screen.stop()
+        urwid.escape.SHOW_CURSOR = show_cursor_escape
diff --git a/editty/segment.py b/editty/segment.py
new file mode 100644
index 0000000..dd6faab
--- /dev/null
+++ b/editty/segment.py
@@ -0,0 +1,290 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2019 James E. Blair <corvus@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import logging
+import uuid
+
+import urwid
+
+from editty.source import Frame
+
+class Segment(object):
+    def __init__(self):
+        super().__init__()
+        self.visible_cursor = True
+
+    def __repr__(self):
+        return '<%s from %s to %s (%s seconds)>' % (self.__class__.__name__, self.start, self.end, self.duration)
+
+    @classmethod
+    def fromJSON(cls, data, sources):
+        if data['type'] == 'clip':
+            ret = Clip.fromJSON(data, sources)
+        elif data['type'] == 'freeze-frame':
+            ret = FreezeFrame.fromJSON(data, sources)
+        elif data['type'] == 'black':
+            ret = Black.fromJSON(data, sources)
+        elif data['type'] == 'dissolve':
+            ret = Dissolve.fromJSON(data, sources)
+        else:
+            raise Exception("Unknown segment type: %s" % data.get('type'))
+        ret.visible_cursor = data.get('visible_cursor', True)
+        return ret
+
+    def toJSON(self):
+        return dict(visible_cursor=self.visible_cursor)
+
+    def updateCopy(self, copy):
+        copy.visible_cursor = self.visible_cursor
+        return copy
+
+class Clip(Segment):
+    def __init__(self, source, start, end, **kw):
+        super().__init__(**kw)
+        self.source = source
+        self.start = start
+        self.end = end
+
+    def toJSON(self):
+        d = super().toJSON()
+        d.update(dict(type='clip',
+                      source=self.source.uuid,
+                      start=self.start,
+                      end=self.end))
+        return d
+
+    @classmethod
+    def fromJSON(cls, data, sources):
+        return Clip(sources[data['source']],
+                    data['start'],
+                    data['end'])
+
+    @property
+    def duration(self):
+        return self.end - self.start
+
+    def copy(self):
+        ret = Clip(self.source, self.start, self.end)
+        return super().updateCopy(ret)
+
+    def __iter__(self):
+        for fi in self.source.getFrames(self.start, self.end):
+            yield (fi[0]-self.start, fi[1])
+
+class Still(Segment):
+    def __init__(self, duration):
+        super(Still, self).__init__()
+        self.duration = duration
+
+    @property
+    def start(self):
+        return 0.0
+
+    @start.setter
+    def start(self, start):
+        self.duration -= start
+
+    @property
+    def end(self):
+        return self.duration
+
+    @end.setter
+    def end(self, end):
+        delta = end - self.duration
+        self.duration -= delta
+
+class FreezeFrame(Still):
+    def __init__(self, source, timecode, duration):
+        super(FreezeFrame, self).__init__(duration)
+        self.source = source
+        self.start = 0.0
+        self.timecode = timecode
+        self.end = duration
+
+    def toJSON(self):
+        return dict(type='freeze-frame',
+                    source=self.source.uuid,
+                    timecode=self.timecode,
+                    duration=self.end)
+
+    @classmethod
+    def fromJSON(cls, data, sources):
+        return FreezeFrame(sources[data['source']],
+                           data['timecode'],
+                           data['duration'])
+
+    def copy(self):
+        ret = FreezeFrame(self.source, self.timecode, self.duration)
+        return super().updateCopy(ret)
+
+class Black(Still):
+    def __init__(self, duration):
+        super(Black, self).__init__(duration)
+        self.start = 0.0
+        self.end = duration
+
+    def toJSON(self):
+        return dict(type='black',
+                    duration=self.end)
+
+    @classmethod
+    def fromJSON(cls, data, sources):
+        return Black(data['duration'])
+
+    def copy(self):
+        ret = Black(self.duration)
+        return super().updateCopy(ret)
+
+class Dissolve(Segment):
+    def __init__(self, start_source, start_timecode, end_source, end_timecode, duration, **kw):
+        super().__init__(**kw)
+        self.log = logging.getLogger('program')
+        self.start_source = start_source
+        self.start_timecode = start_timecode
+        self.end_source = end_source
+        self.end_timecode = end_timecode
+        self.duration = duration
+        self._cache = []
+        self._update()
+
+    def copy(self):
+        ret = Dissolve(self.start_source, self.start_timecode,
+                       self.end_source, self.end_timecode, self.duration)
+        return super().updateCopy(ret)
+
+    @classmethod
+    def fromJSON(cls, data, sources):
+        return Dissolve(sources[data['start_source']],
+                        data['start_timecode'],
+                        sources[data['end_source']],
+                        data['end_timecode'],
+                        data['duration'])
+
+    def toJSON(self):
+        d = super().toJSON()
+        d.update(dict(type='dissolve',
+                      start_source=self.start_source.uuid,
+                      start_timecode=self.start_timecode,
+                      end_source=self.end_source.uuid,
+                      end_timecode=self.end_timecode,
+                      duration=self.duration))
+        return d
+
+    @property
+    def start(self):
+        return 0.0
+
+    @start.setter
+    def start(self, start):
+        self.duration -= start
+        self._update()
+
+    @property
+    def end(self):
+        return self.duration
+
+    @end.setter
+    def end(self, end):
+        delta = end - self.duration
+        self.duration -= delta
+        self._update()
+
+    def __iter__(self):
+        for x in self._cache:
+            yield x
+
+    def _update(self):
+        start = list(self.start_source.getFrames(self.start_timecode, self.start_timecode))[0]
+        end = list(self.end_source.getFrames(self.end_timecode, self.end_timecode))[0]
+        self._cache = []
+        num_frames = int(self.duration * 10)
+        for tween_index in range(num_frames):
+            tween_frame = self._render(start[1], end[1], tween_index / (self.duration*10.0))
+            self._cache.append((self.start+(tween_index/10.0), tween_frame))
+
+    def _fixrgb(self, rgb, background):
+        ret = []
+        for i in range(len(rgb)):
+            if rgb[i] is None:
+                ret.append(background[i])
+            else:
+                ret.append(rgb[i])
+        return ret
+
+    def _render(self, start, end, progress):
+        line_list = []
+        attr_list = []
+        line_text = ''
+        line_attrs = []
+        current_attr = [None, 0]
+        current_rgb = None
+        current_props = None
+        ret_content = []
+        background = urwid.AttrSpec('light gray', 'black')
+        for line_i in range(len(start.content)):
+            ret_line = []
+            for char_i in range(len(start.content[line_i])):
+                if line_i == 1 and char_i == 0:
+                    self.log.debug("tween %s %s", start.content[line_i][char_i], end.content[line_i][char_i])
+                oldattr, oldcs, oldchar = start.content[line_i][char_i]
+                newattr, newcs, newchar = end.content[line_i][char_i]
+                if oldattr is None:
+                    oldrgb = background.get_rgb_values()
+                else:
+                    oldrgb = oldattr.get_rgb_values()
+                oldrgb = self._fixrgb(oldrgb, background.get_rgb_values())
+                if newattr is None:
+                    newrgb = background.get_rgb_values()
+                else:
+                    newrgb = newattr.get_rgb_values()
+                newrgb = self._fixrgb(newrgb, background.get_rgb_values())
+                if newchar == b' ' and oldchar != b' ':
+                    char = oldchar
+                    charattr = oldattr
+                    newrgb = newrgb[3:]*2
+                elif oldchar == b' ' and newchar != b' ':
+                    char = newchar
+                    charattr = newattr
+                    oldrgb = oldrgb[3:]*2
+                elif progress >= 0.5:
+                    char = newchar
+                    charattr = newattr
+                else:
+                    char = oldchar
+                    charattr = oldattr
+                rgb = []
+                props = []
+                if charattr and charattr.bold:
+                    props.append('bold')
+                if charattr and charattr.underline:
+                    props.append('underline')
+                if charattr and charattr.standout:
+                    props.append('standout')
+                if charattr and charattr.blink:
+                    props.append('blink')
+                for x in range(len(oldrgb)):
+                    rgb.append(int(((newrgb[x]-oldrgb[x])*progress)+oldrgb[x])>>4)
+                fg = ', '.join(props + ['#%x%x%x' % tuple(rgb[:3])])
+                bg = '#%x%x%x' % tuple(rgb[3:])
+                attr = urwid.AttrSpec(fg, bg)
+                ret_line.append((attr, oldcs, char))
+            ret_content.append(ret_line)
+        if progress > 0.5:
+            which = end
+        else:
+            which = start
+        frame = Frame(None, which.timeline_color, content=ret_content, cursor=which.cursor)
+        return frame
diff --git a/editty/source.py b/editty/source.py
new file mode 100644
index 0000000..1a26407
--- /dev/null
+++ b/editty/source.py
@@ -0,0 +1,177 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2019 James E. Blair <corvus@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import logging
+import time
+import struct
+import uuid
+
+import urwid
+
+class Frame:
+    def __init__(self, term, timeline_color, content=None, cursor=None):
+        if content is not None:
+            self.content = content
+        else:
+            self.content = [line[:] for line in term.content()]
+        if cursor is not None:
+            self.cursor = cursor
+        else:
+            self.cursor = term.term_cursor[:]
+        self.timeline_color = timeline_color
+        # TODO: cursor visibility, current color
+
+class SourceClip:
+    def __init__(self, size, title, file_type, stream_fn, timing_fn, timeline_color):
+        self.title = 'Untitled'
+        self.size = size
+        self.frames = []
+        self.times = []
+        self.length = 0.0
+        self.file_type = file_type
+        self.stream_fn = stream_fn
+        self.timing_fn = timing_fn
+        self.uuid = str(uuid.uuid4())
+        self.timeline_color = timeline_color
+
+    def addFrame(self, timecode, frame):
+        self.frames.append(frame)
+        self.times.append(timecode)
+        self.length = timecode
+
+    def toJSON(self):
+        return dict(type=self.file_type,
+                    uuid=self.uuid,
+                    size=self.size,
+                    stream=self.stream_fn,
+                    timing=self.timing_fn,
+                    color=self.timeline_color)
+
+    @classmethod
+    def fromJSON(cls, data):
+        ft = getFileType(data['type'])
+        sc = ft.load(data['size'], data['stream'], data['timing'], data['color'])
+        sc.uuid = data['uuid']
+        return sc
+
+    def getFrames(self, start, end):
+        # In case we need to supply the frame before the start:
+        prev = None
+        yielded = False
+        for fi in zip(self.times, self.frames):
+            if end is not None and fi[0] > end:
+                if not yielded and prev is not None:
+                    yield (start, prev[1])
+                return
+            if start is not None:
+                if fi[0] < start:
+                    prev = fi
+                    continue
+                if prev is not None and fi[0] > start:
+                    yield (start, prev[1])
+                    yielded = True
+            start = None
+            yield fi
+            yielded = True
+
+class FileType:
+    timing = False
+
+    def __init__(self):
+        self.log = logging.getLogger('file')
+
+    def _loadCanvas(self, size, stream_fn, timing_fn, timeline_color):
+        title = os.path.split(stream_fn)[-1]
+        source_clip = SourceClip(size, title, self.name, stream_fn, timing_fn, timeline_color)
+        class LoadWidget(urwid.Widget):
+            term_modes = urwid.TermModes()
+            def beep(self): pass
+            def set_title(self, title): pass
+        canv = urwid.TermCanvas(size[0], size[1], LoadWidget())
+        canv.modes.main_charset = urwid.vterm.CHARSET_UTF8
+
+        return (source_clip, canv)
+
+class ScriptFile(FileType):
+    name = 'Script'
+    timing = True
+
+    def load(self, size, stream_fn, timing_fn, timeline_color):
+        self.log.debug('Loading %s %s', stream_fn, timing_fn)
+        source_clip, canvas = self._loadCanvas(size, stream_fn, timing_fn, timeline_color)
+        start = time.time()
+        buffer_pos = 0
+        timecode = 0.0
+        with open(stream_fn, 'rb') as s:
+            stream = s.read()
+            i = stream.find(b'\n')
+            stream = stream[i+1:]
+        with open(timing_fn) as f:
+            for i, line in enumerate(f):
+                delay, count = line.strip().split(' ')
+                delay = float(delay)
+                count = int(count)
+                timecode += delay
+                data = stream[buffer_pos:buffer_pos+count]
+                canvas.addstr(data)
+                buffer_pos += count
+                source_clip.addFrame(timecode, Frame(canvas, timeline_color))
+        end = time.time()
+        self.log.debug('Finished loading %s', end-start)
+        return source_clip
+
+class TtyrecFile(FileType):
+    name = 'Ttyrec'
+
+    def load(self, size, stream_fn, timing_fn, timeline_color):
+        self.log.debug('Loading %s %s', stream_fn, timing_fn)
+        source_clip, canvas = self._loadCanvas(size, stream_fn, timing_fn, timeline_color)
+        with open(stream_fn, 'rb') as ttyrec_in:
+            start_time = None
+            while True:
+                header = ttyrec_in.read(12)
+                if not header:
+                    self.log.debug("no header")
+                    break
+                tc_secs, tc_usecs, dlen = struct.unpack('<III', header)
+                timecode = tc_secs + tc_usecs/1000000.0
+                if start_time is None:
+                    # If the first frame is less than a year from the
+                    # epoch, assume we are 0-based, otherwise, assume
+                    # it's epoch-based and use the first timecode as
+                    # the basis.
+                    if timecode > 365*24*60*60:
+                        start_time = timecode
+                    else:
+                        start_time = 0.0
+                data = ttyrec_in.read(dlen)
+                if len(data) != dlen:
+                    raise Exception("short read")
+                canvas.addstr(data)
+                self.log.debug("Frame %0.6f %i" % (timecode, dlen))
+                source_clip.addFrame(timecode-start_time, Frame(canvas, timeline_color))
+        return source_clip
+
+all_types = [
+    TtyrecFile(),
+    ScriptFile(),
+]
+
+def getFileType(name):
+    for ft in all_types:
+        if ft.name == name:
+            return ft
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..33442ab
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+pbr>=1.0.0
+
+urwid
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..cb2c14c
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,44 @@
+# Copyright (C) 2019 James E. Blair <corvus@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+[metadata]
+name = editty
+summary = Terminal-based non-linear editor for terminal recordings
+description-file =
+    README.rst
+author = James E. Blair
+author-email = corvus@gnu.org
+classifier =
+    Environment :: Console
+    Intended Audience :: Developers
+    Intended Audience :: Education
+    Intended Audience :: End Users/Desktop
+    Intended Audience :: Information Technology
+    Intended Audience :: System Administrators
+    License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
+    Programming Language :: Python
+    Topic :: Multimedia :: Graphics :: Presentation
+
+[pbr]
+warnerrors = True
+
+[entry_points]
+console_scripts =
+    editty = editty.editty:main
+
+[build_sphinx]
+source-dir = doc/source
+build-dir = doc/build
+all_files = 1
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..5cc296f
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,20 @@
+# Copyright (C) 2019 James E. Blair <corvus@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import setuptools
+
+setuptools.setup(
+    setup_requires=['pbr'],
+    pbr=True)
diff --git a/test-requirements.txt b/test-requirements.txt
new file mode 100644
index 0000000..939f75f
--- /dev/null
+++ b/test-requirements.txt
@@ -0,0 +1 @@
+stestr
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/__init__.py
diff --git a/tests/test.py b/tests/test.py
new file mode 100644
index 0000000..9cf45f7
--- /dev/null
+++ b/tests/test.py
@@ -0,0 +1,191 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2019 James E. Blair <corvus@gnu.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import logging
+import struct
+import tempfile
+
+import testtools
+import fixtures
+
+from editty.segment import *
+from editty.program import *
+import editty.source
+
+class BaseTestCase(testtools.TestCase):
+    def setUp(self):
+        super().setUp()
+        fs = '%(asctime)s %(levelname)s [%(name)s] %(message)s'
+        self.useFixture(fixtures.FakeLogger(level=logging.DEBUG,
+                                            format=fs))
+        self.log = logging.getLogger("test")
+
+class FileTypeTests:
+    def get_frames(self, source):
+        ret = []
+        for (timecode, frame) in source.getFrames(0, source.length):
+            ret.append((timecode, b''.join([x[2] for x in frame.content[0]]).strip()))
+        return ret
+
+    def test_load(self):
+        source = self.setup()
+        self.assertEqual(
+            [(1.0, b'a'), (2.0, b'ab'), (3.0, b'abc'), (4.0, b'abcd')],
+            self.get_frames(source))
+
+class TestScriptFile(BaseTestCase, FileTypeTests):
+    def setup(self):
+        size = (80, 24)
+        with tempfile.NamedTemporaryFile() as stream:
+            with tempfile.NamedTemporaryFile() as timing:
+                stream.write(b"\nabcd")
+                for x in range(4):
+                    timing.write(b"1.0 1\n")
+                stream.flush()
+                timing.flush()
+                source = editty.source.ScriptFile().load(
+                    size, stream.name, timing.name, 'color')
+        return source
+
+class TestTtyrecFile(BaseTestCase, FileTypeTests):
+    def setup(self):
+        size = (80, 24)
+        frames = [(1.0, b'a'), (2.0, b'b'), (3.0, b'c'), (4.0, b'd')]
+        with tempfile.NamedTemporaryFile() as stream:
+            for (timecode, data) in frames:
+                tc_secs, tc_usecs = map(int, ('%0.6f' % timecode).split('.'))
+                stream.write(struct.pack('<III',
+                                             tc_secs, tc_usecs, len(data)))
+                stream.write(data)
+            stream.flush()
+            source = editty.source.TtyrecFile().load(
+                size, stream.name, None, 'color')
+        return source
+
+class TestProgram(BaseTestCase):
+    size = (80, 24)
+
+    def setup(self, color='1'):
+        with tempfile.NamedTemporaryFile() as stream:
+            with tempfile.NamedTemporaryFile() as timing:
+                stream.write(b"\nabcd")
+                for x in range(4):
+                    timing.write(b"1.0 1\n")
+                stream.flush()
+                timing.flush()
+                source = editty.source.ScriptFile().load(
+                    self.size, stream.name, timing.name, color)
+        program = Program(source.title)
+        program.append(Clip(source, 0.0, source.length))
+        return program
+
+    def get_frames(self, program, start, end, color=False):
+        ret = []
+        for fi in program.getFrames(start, end):
+            if color:
+                ret.append((fi.timecode, b''.join([x[2] for x in fi.frame.content[0]]).strip(), fi.frame.timeline_color))
+            else:
+                ret.append((fi.timecode, b''.join([x[2] for x in fi.frame.content[0]]).strip()))
+        return ret
+
+    def test_playback(self):
+        program = self.setup()
+        frames = self.get_frames(program, 0, program.length)
+        self.assertEqual(
+            [(1.0, b'a'), (2.0, b'ab'), (3.0, b'abc'), (4.0, b'abcd')],
+            frames)
+
+    def test_cut(self):
+        p1 = self.setup('1')
+        self.assertEqual(
+            [(1.0, b'a'), (2.0, b'ab'), (3.0, b'abc'), (4.0, b'abcd')],
+            self.get_frames(p1, None, None))
+
+        cut = p1.cut(2.0, 3.0)
+        self.assertEqual(
+            [(1.0, b'a'), (2.0, b'ab'), (2.0, b'abc'), (3.0, b'abcd')],
+            self.get_frames(p1, None, None))
+        self.assertEqual(
+            [(0.0, b'ab'), (1.0, b'abc')],
+            self.get_frames(cut, None, None))
+
+        p2 = self.setup('2')
+        p2.insert(2.5, cut)
+        self.log.debug(self.get_frames(p2, None, None, True))
+
+        cut = p2.cut(2.0, 4.0)
+        p3 = self.setup('3')
+        self.log.debug("cut")
+        for s in cut.segments:
+            self.log.debug(s)
+        self.log.debug(self.get_frames(cut, None, None, True))
+        self.assertEqual(
+            [(0.0, b'ab', '2'), (0.5, b'ab',  '1'), (1.5, b'abc', '1'),
+             (1.5, b'ab', '2'), (2.0, b'abc', '2')],
+            self.get_frames(cut, None, None, True))
+        p3.insert(2.5, cut)
+        self.log.debug(self.get_frames(p3, None, None, True))
+        self.assertEqual(
+            [(1.0, b'a',  '3'), (2.0, b'ab',  '3'),
+             (2.5, b'ab', '2'),
+             (3.0, b'ab', '1'), (4.0, b'abc', '1'),
+             (4.0, b'ab', '2'), (4.5, b'abc', '2'),
+             (4.5, b'ab', '3'), (5.0, b'abc', '3'), (6.0, b'abcd', '3')],
+            self.get_frames(p3, None, None, True))
+
+    def test_repeated_cut(self):
+        p1 = self.setup('1')
+        self.assertEqual(
+            [(1.0, b'a'), (2.0, b'ab'), (3.0, b'abc'), (4.0, b'abcd')],
+            self.get_frames(p1, None, None))
+
+        cut = p1.cut(2.0, 3.0)
+        self.assertEqual(
+            [(1.0, b'a'), (2.0, b'ab'), (2.0, b'abc'), (3.0, b'abcd')],
+            self.get_frames(p1, None, None))
+        self.assertEqual(
+            [(0.0, b'ab'), (1.0, b'abc')],
+            self.get_frames(cut, None, None))
+        p2 = Program('2')
+        self.log.debug('append')
+        for s in cut.segments:
+            self.log.debug(s)
+        p2.append(cut)
+        self.log.debug('appended')
+        for s in p2.segments:
+            self.log.debug(s)
+        self.log.debug(self.get_frames(p2, None, None, True))
+
+        cut = p1.cut(2.2, 2.7)  # 3.2 - 3.7
+        self.log.debug(self.get_frames(p1, None, None))
+        self.assertEqual(
+            [(1.0, b'a'), (2.0, b'ab'), (2.0, b'abc'), (2.2, b'abc'), (2.5, b'abcd')],
+            self.get_frames(p1, None, None))
+        self.log.debug(self.get_frames(cut, None, None))
+        self.assertEqual(
+            [(0.0, b'abc')],
+            self.get_frames(cut, None, None))
+        self.log.debug('append')
+        for s in cut.segments:
+            self.log.debug(s)
+        p2.append(cut)
+        self.log.debug('appended')
+        for s in p2.segments:
+            self.log.debug(s)
+        self.log.debug(self.get_frames(p2, None, None, True))
+        self.assertEqual(
+            [(0.0, b'ab', '1'), (1.0, b'abc', '1'), (1.0, b'abc', '1')],
+            self.get_frames(p2, None, None, True))
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..764a7fa
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,8 @@
+[testenv]
+basepython = python3
+usedevelop = True
+deps =
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/test-requirements.txt
+commands =
+  stestr run {posargs}