Adding kvm test

The KVM team has been working on a set of tests for our virtualization
stack based on autotest. The project is known as kvm-autotest:

http://www.linux-kvm.org/page/KVM-Autotest

git://git.kernel.org/pub/scm/virt/kvm/kvm-autotest.git

In order to accomodate the needs of KVM Quality Engineering, quite a
substantial amount of code was written. A very brief overview of how the
tests are structured follows:

* kvm_runtest_2: Entry point, that defines hooks to all the KVM tests,
documented under:

http://www.linux-kvm.org/page/KVM-Autotest/Tests

* kvm_config: Module that handles the KVM configuration file format

http://www.linux-kvm.org/page/KVM-Autotest/Test_Config_File

It parses the configuration file and generates a list of dictionaries
that will be used by the other tests.

* step editor and stepmaker: A method to automate installation of guests
was devised, the idea is to send input to qemu through *step files*.
StepEditor and StepMaker are pygtk applications that allow to create and
edit step files.

From:
uril@redhat.com (Uri Lublin)
mgoldish@redhat.com (Michael Goldish)
dhuff@redhat.com (David Huff)
aeromenk@redhat.com (Alexey Eromenko)
mburns@redhat.com (Mike Burns)

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>


git-svn-id: http://test.kernel.org/svn/autotest/trunk@3187 592f7852-d20e-0410-864c-8624ca9c26a4
diff --git a/client/tests/kvm/stepeditor.py b/client/tests/kvm/stepeditor.py
new file mode 100755
index 0000000..f2ef1aa
--- /dev/null
+++ b/client/tests/kvm/stepeditor.py
@@ -0,0 +1,1393 @@
+#!/usr/bin/env python
+import pygtk, gtk, os, glob, shutil, sys, logging
+import ppm_utils
+pygtk.require('2.0')
+
+"""
+Step file creator/editor.
+
+@copyright: Red Hat Inc 2009
+@author: mgoldish@redhat.com (Michael Goldish)
+@version: "20090401"
+"""
+
+
+# General utilities
+
+def corner_and_size_clipped(startpoint, endpoint, limits):
+    c0 = startpoint[:]
+    c1 = endpoint[:]
+    if c0[0] < 0: c0[0] = 0
+    if c0[1] < 0: c0[1] = 0
+    if c1[0] < 0: c1[0] = 0
+    if c1[1] < 0: c1[1] = 0
+    if c0[0] > limits[0] - 1: c0[0] = limits[0] - 1
+    if c0[1] > limits[1] - 1: c0[1] = limits[1] - 1
+    if c1[0] > limits[0] - 1: c1[0] = limits[0] - 1
+    if c1[1] > limits[1] - 1: c1[1] = limits[1] - 1
+    return ([min(c0[0], c1[0]),
+             min(c0[1], c1[1])],
+            [abs(c1[0] - c0[0]) + 1,
+             abs(c1[1] - c0[1]) + 1])
+
+
+def key_event_to_qemu_string(event):
+    keymap = gtk.gdk.keymap_get_default()
+    keyvals = keymap.get_entries_for_keycode(event.hardware_keycode)
+    keyval = keyvals[0][0]
+    keyname = gtk.gdk.keyval_name(keyval)
+
+    dict = { "Return": "ret",
+             "Tab": "tab",
+             "space": "spc",
+             "Left": "left",
+             "Right": "right",
+             "Up": "up",
+             "Down": "down",
+             "F1": "f1",
+             "F2": "f2",
+             "F3": "f3",
+             "F4": "f4",
+             "F5": "f5",
+             "F6": "f6",
+             "F7": "f7",
+             "F8": "f8",
+             "F9": "f9",
+             "F10": "f10",
+             "F11": "f11",
+             "F12": "f12",
+             "Escape": "esc",
+             "minus": "minus",
+             "equal": "equal",
+             "BackSpace": "backspace",
+             "comma": "comma",
+             "period": "dot",
+             "slash": "slash",
+             "Insert": "insert",
+             "Delete": "delete",
+             "Home": "home",
+             "End": "end",
+             "Page_Up": "pgup",
+             "Page_Down": "pgdn",
+             "Menu": "menu",
+             "semicolon": "0x27",
+             "backslash": "0x2b",
+             "apostrophe": "0x28",
+             "grave": "0x29",
+             "less": "0x2b",
+             "bracketleft": "0x1a",
+             "bracketright": "0x1b",
+             "Super_L": "0xdc",
+             "Super_R": "0xdb",
+             }
+
+    if ord('a') <= keyval <= ord('z') or ord('0') <= keyval <= ord('9'):
+        str = keyname
+    elif keyname in dict.keys():
+        str = dict[keyname]
+    else:
+        return ""
+
+    if event.state & gtk.gdk.CONTROL_MASK: str = "ctrl-" + str
+    if event.state & gtk.gdk.MOD1_MASK: str = "alt-" + str
+    if event.state & gtk.gdk.SHIFT_MASK: str = "shift-" + str
+
+    return str
+
+
+class StepMakerWindow:
+
+    # Constructor
+
+    def __init__(self):
+        # Window
+        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
+        self.window.set_title("Step Maker Window")
+        self.window.connect("delete-event", self.delete_event)
+        self.window.connect("destroy", self.destroy)
+        self.window.set_default_size(600, 800)
+
+        # Main box (inside a frame which is inside a VBox)
+        self.menu_vbox = gtk.VBox()
+        self.window.add(self.menu_vbox)
+        self.menu_vbox.show()
+
+        frame = gtk.Frame()
+        frame.set_border_width(10)
+        frame.set_shadow_type(gtk.SHADOW_NONE)
+        self.menu_vbox.pack_end(frame)
+        frame.show()
+
+        self.main_vbox = gtk.VBox(spacing=10)
+        frame.add(self.main_vbox)
+        self.main_vbox.show()
+
+        # EventBox
+        self.scrolledwindow = gtk.ScrolledWindow()
+        self.scrolledwindow.set_policy(gtk.POLICY_AUTOMATIC,
+                                       gtk.POLICY_AUTOMATIC)
+        self.scrolledwindow.set_shadow_type(gtk.SHADOW_NONE)
+        self.main_vbox.pack_start(self.scrolledwindow)
+        self.scrolledwindow.show()
+
+        table = gtk.Table(1, 1)
+        self.scrolledwindow.add_with_viewport(table)
+        table.show()
+        table.realize()
+
+        self.event_box = gtk.EventBox()
+        table.attach(self.event_box, 0, 1, 0, 1, gtk.EXPAND, gtk.EXPAND)
+        self.event_box.show()
+        self.event_box.realize()
+
+        # Image
+        self.image = gtk.Image()
+        self.event_box.add(self.image)
+        self.image.show()
+
+        # Data VBox
+        self.data_vbox = gtk.VBox(spacing=10)
+        self.main_vbox.pack_start(self.data_vbox, expand=False)
+        self.data_vbox.show()
+
+        # User VBox
+        self.user_vbox = gtk.VBox(spacing=10)
+        self.main_vbox.pack_start(self.user_vbox, expand=False)
+        self.user_vbox.show()
+
+        # Screendump ID HBox
+        box = gtk.HBox(spacing=10)
+        self.data_vbox.pack_start(box)
+        box.show()
+
+        label = gtk.Label("Screendump ID:")
+        box.pack_start(label, False)
+        label.show()
+
+        self.entry_screendump = gtk.Entry()
+        self.entry_screendump.set_editable(False)
+        box.pack_start(self.entry_screendump)
+        self.entry_screendump.show()
+
+        label = gtk.Label("Time:")
+        box.pack_start(label, False)
+        label.show()
+
+        self.entry_time = gtk.Entry()
+        self.entry_time.set_editable(False)
+        self.entry_time.set_width_chars(10)
+        box.pack_start(self.entry_time, False)
+        self.entry_time.show()
+
+        # Comment HBox
+        box = gtk.HBox(spacing=10)
+        self.data_vbox.pack_start(box)
+        box.show()
+
+        label = gtk.Label("Comment:")
+        box.pack_start(label, False)
+        label.show()
+
+        self.entry_comment = gtk.Entry()
+        box.pack_start(self.entry_comment)
+        self.entry_comment.show()
+
+        # Sleep HBox
+        box = gtk.HBox(spacing=10)
+        self.data_vbox.pack_start(box)
+        box.show()
+
+        self.check_sleep = gtk.CheckButton("Sleep:")
+        self.check_sleep.connect("toggled", self.event_check_sleep_toggled)
+        box.pack_start(self.check_sleep, False)
+        self.check_sleep.show()
+
+        self.spin_sleep = gtk.SpinButton(gtk.Adjustment(0, 0, 50000, 1, 10, 0),
+                                         climb_rate=0.0)
+        box.pack_start(self.spin_sleep, False)
+        self.spin_sleep.show()
+
+        # Barrier HBox
+        box = gtk.HBox(spacing=10)
+        self.data_vbox.pack_start(box)
+        box.show()
+
+        self.check_barrier = gtk.CheckButton("Barrier:")
+        self.check_barrier.connect("toggled", self.event_check_barrier_toggled)
+        box.pack_start(self.check_barrier, False)
+        self.check_barrier.show()
+
+        vbox = gtk.VBox()
+        box.pack_start(vbox)
+        vbox.show()
+
+        self.label_barrier_region = gtk.Label("Region:")
+        self.label_barrier_region.set_alignment(0, 0.5)
+        vbox.pack_start(self.label_barrier_region)
+        self.label_barrier_region.show()
+
+        self.label_barrier_md5sum = gtk.Label("MD5:")
+        self.label_barrier_md5sum.set_alignment(0, 0.5)
+        vbox.pack_start(self.label_barrier_md5sum)
+        self.label_barrier_md5sum.show()
+
+        self.label_barrier_timeout = gtk.Label("Timeout:")
+        box.pack_start(self.label_barrier_timeout, False)
+        self.label_barrier_timeout.show()
+
+        self.spin_barrier_timeout = gtk.SpinButton(gtk.Adjustment(0, 0, 50000,
+                                                                  1, 10, 0),
+                                                                 climb_rate=0.0)
+        box.pack_start(self.spin_barrier_timeout, False)
+        self.spin_barrier_timeout.show()
+
+        self.check_barrier_optional = gtk.CheckButton("Optional")
+        box.pack_start(self.check_barrier_optional, False)
+        self.check_barrier_optional.show()
+
+        # Keystrokes HBox
+        box = gtk.HBox(spacing=10)
+        self.data_vbox.pack_start(box)
+        box.show()
+
+        label = gtk.Label("Keystrokes:")
+        box.pack_start(label, False)
+        label.show()
+
+        frame = gtk.Frame()
+        frame.set_shadow_type(gtk.SHADOW_IN)
+        box.pack_start(frame)
+        frame.show()
+
+        self.text_buffer = gtk.TextBuffer() ;
+        self.entry_keys = gtk.TextView(self.text_buffer)
+        self.entry_keys.set_wrap_mode(gtk.WRAP_WORD)
+        self.entry_keys.connect("key-press-event", self.event_key_press)
+        frame.add(self.entry_keys)
+        self.entry_keys.show()
+
+        self.check_manual = gtk.CheckButton("Manual")
+        self.check_manual.connect("toggled", self.event_manual_toggled)
+        box.pack_start(self.check_manual, False)
+        self.check_manual.show()
+
+        button = gtk.Button("Clear")
+        button.connect("clicked", self.event_clear_clicked)
+        box.pack_start(button, False)
+        button.show()
+
+        # Mouse click HBox
+        box = gtk.HBox(spacing=10)
+        self.data_vbox.pack_start(box)
+        box.show()
+
+        label = gtk.Label("Mouse action:")
+        box.pack_start(label, False)
+        label.show()
+
+        self.button_capture = gtk.Button("Capture")
+        box.pack_start(self.button_capture, False)
+        self.button_capture.show()
+
+        self.check_mousemove = gtk.CheckButton("Move: ...")
+        box.pack_start(self.check_mousemove, False)
+        self.check_mousemove.show()
+
+        self.check_mouseclick = gtk.CheckButton("Click: ...")
+        box.pack_start(self.check_mouseclick, False)
+        self.check_mouseclick.show()
+
+        self.spin_sensitivity = gtk.SpinButton(gtk.Adjustment(1, 1, 100, 1, 10,
+                                                              0),
+                                                              climb_rate=0.0)
+        box.pack_end(self.spin_sensitivity, False)
+        self.spin_sensitivity.show()
+
+        label = gtk.Label("Sensitivity:")
+        box.pack_end(label, False)
+        label.show()
+
+        self.spin_latency = gtk.SpinButton(gtk.Adjustment(10, 1, 500, 1, 10, 0),
+                                           climb_rate=0.0)
+        box.pack_end(self.spin_latency, False)
+        self.spin_latency.show()
+
+        label = gtk.Label("Latency:")
+        box.pack_end(label, False)
+        label.show()
+
+        self.handler_event_box_press = None
+        self.handler_event_box_release = None
+        self.handler_event_box_scroll = None
+        self.handler_event_box_motion = None
+        self.handler_event_box_expose = None
+
+        self.window.realize()
+        self.window.show()
+
+        self.clear_state()
+
+    # Utilities
+
+    def message(self, text, title):
+        dlg = gtk.MessageDialog(self.window,
+                gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
+                gtk.MESSAGE_INFO,
+                gtk.BUTTONS_CLOSE,
+                title)
+        dlg.set_title(title)
+        dlg.format_secondary_text(text)
+        response = dlg.run()
+        dlg.destroy()
+
+
+    def question_yes_no(self, text, title):
+        dlg = gtk.MessageDialog(self.window,
+                gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
+                gtk.MESSAGE_QUESTION,
+                gtk.BUTTONS_YES_NO,
+                title)
+        dlg.set_title(title)
+        dlg.format_secondary_text(text)
+        response = dlg.run()
+        dlg.destroy()
+        if response == gtk.RESPONSE_YES:
+            return True
+        return False
+
+
+    def inputdialog(self, text, title, default_response=""):
+        # Define a little helper function
+        def inputdialog_entry_activated(entry):
+            dlg.response(gtk.RESPONSE_OK)
+
+        # Create the dialog
+        dlg = gtk.MessageDialog(self.window,
+                gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
+                gtk.MESSAGE_QUESTION,
+                gtk.BUTTONS_OK_CANCEL,
+                title)
+        dlg.set_title(title)
+        dlg.format_secondary_text(text)
+
+        # Create an entry widget
+        entry = gtk.Entry()
+        entry.set_text(default_response)
+        entry.connect("activate", inputdialog_entry_activated)
+        dlg.vbox.pack_start(entry)
+        entry.show()
+
+        # Run the dialog
+        response = dlg.run()
+        dlg.destroy()
+        if response == gtk.RESPONSE_OK:
+            return entry.get_text()
+        return None
+
+
+    def filedialog(self, title=None, default_filename=None):
+        chooser = gtk.FileChooserDialog(title=title, parent=self.window,
+                                        action=gtk.FILE_CHOOSER_ACTION_OPEN,
+                buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL, gtk.STOCK_OPEN,
+                         gtk.RESPONSE_OK))
+        chooser.resize(700, 500)
+        if default_filename:
+            chooser.set_filename(os.path.abspath(default_filename))
+        filename = None
+        response = chooser.run()
+        if response == gtk.RESPONSE_OK:
+            filename = chooser.get_filename()
+        chooser.destroy()
+        return filename
+
+
+    def redirect_event_box_input(self, press=None, release=None, scroll=None,
+                                 motion=None, expose=None):
+        if self.handler_event_box_press != None: \
+        self.event_box.disconnect(self.handler_event_box_press)
+        if self.handler_event_box_release != None: \
+        self.event_box.disconnect(self.handler_event_box_release)
+        if self.handler_event_box_scroll != None: \
+        self.event_box.disconnect(self.handler_event_box_scroll)
+        if self.handler_event_box_motion != None: \
+        self.event_box.disconnect(self.handler_event_box_motion)
+        if self.handler_event_box_expose != None: \
+        self.event_box.disconnect(self.handler_event_box_expose)
+        self.handler_event_box_press = None
+        self.handler_event_box_release = None
+        self.handler_event_box_scroll = None
+        self.handler_event_box_motion = None
+        self.handler_event_box_expose = None
+        if press != None: self.handler_event_box_press = \
+        self.event_box.connect("button-press-event", press)
+        if release != None: self.handler_event_box_release = \
+        self.event_box.connect("button-release-event", release)
+        if scroll != None: self.handler_event_box_scroll = \
+        self.event_box.connect("scroll-event", scroll)
+        if motion != None: self.handler_event_box_motion = \
+        self.event_box.connect("motion-notify-event", motion)
+        if expose != None: self.handler_event_box_expose = \
+        self.event_box.connect_after("expose-event", expose)
+
+
+    def get_keys(self):
+        return self.text_buffer.get_text(
+                self.text_buffer.get_start_iter(),
+                self.text_buffer.get_end_iter())
+
+
+    def add_key(self, key):
+        text = self.get_keys()
+        if len(text) > 0 and text[-1] != ' ':
+            text += " "
+        text += key
+        self.text_buffer.set_text(text)
+
+
+    def clear_keys(self):
+        self.text_buffer.set_text("")
+
+
+    def update_barrier_info(self):
+        if self.barrier_selected:
+            self.label_barrier_region.set_text("Selected region: Corner: " + \
+                                            str(tuple(self.barrier_corner)) + \
+                                            " Size: " + \
+                                            str(tuple(self.barrier_size)))
+        else:
+            self.label_barrier_region.set_text("No region selected.")
+        self.label_barrier_md5sum.set_text("MD5: " + self.barrier_md5sum)
+
+
+    def update_mouse_click_info(self):
+        if self.mouse_click_captured:
+            self.check_mousemove.set_label("Move: " + \
+                                           str(tuple(self.mouse_click_coords)))
+            self.check_mouseclick.set_label("Click: button %d" %
+                                            self.mouse_click_button)
+        else:
+            self.check_mousemove.set_label("Move: ...")
+            self.check_mouseclick.set_label("Click: ...")
+
+
+    def clear_state(self, clear_screendump=True):
+        # Recording time
+        self.entry_time.set_text("unknown")
+        if clear_screendump:
+            # Screendump
+            self.clear_image()
+        # Screendump ID
+        self.entry_screendump.set_text("")
+        # Comment
+        self.entry_comment.set_text("")
+        # Sleep
+        self.check_sleep.set_active(True)
+        self.check_sleep.set_active(False)
+        self.spin_sleep.set_value(10)
+        # Barrier
+        self.clear_barrier_state()
+        # Keystrokes
+        self.check_manual.set_active(False)
+        self.clear_keys()
+        # Mouse actions
+        self.check_mousemove.set_sensitive(False)
+        self.check_mouseclick.set_sensitive(False)
+        self.check_mousemove.set_active(False)
+        self.check_mouseclick.set_active(False)
+        self.mouse_click_captured = False
+        self.mouse_click_coords = [0, 0]
+        self.mouse_click_button = 0
+        self.update_mouse_click_info()
+
+
+    def clear_barrier_state(self):
+        self.check_barrier.set_active(True)
+        self.check_barrier.set_active(False)
+        self.check_barrier_optional.set_active(False)
+        self.spin_barrier_timeout.set_value(10)
+        self.barrier_selection_started = False
+        self.barrier_selected = False
+        self.barrier_corner0 = [0, 0]
+        self.barrier_corner1 = [0, 0]
+        self.barrier_corner = [0, 0]
+        self.barrier_size = [0, 0]
+        self.barrier_md5sum = ""
+        self.update_barrier_info()
+
+
+    def set_image(self, w, h, data):
+        (self.image_width, self.image_height, self.image_data) = (w, h, data)
+        self.image.set_from_pixbuf(gtk.gdk.pixbuf_new_from_data(
+            data, gtk.gdk.COLORSPACE_RGB, False, 8,
+            w, h, w*3))
+        hscrollbar = self.scrolledwindow.get_hscrollbar()
+        hscrollbar.set_range(0, w)
+        vscrollbar = self.scrolledwindow.get_vscrollbar()
+        vscrollbar.set_range(0, h)
+
+
+    def set_image_from_file(self, filename):
+        if not ppm_utils.image_verify_ppm_file(filename):
+            logging.warning("set_image_from_file: Warning: received invalid"
+                            "screendump file")
+            return self.clear_image()
+        (w, h, data) = ppm_utils.image_read_from_ppm_file(filename)
+        self.set_image(w, h, data)
+
+
+    def clear_image(self):
+        self.image.clear()
+        self.image_width = 0
+        self.image_height = 0
+        self.image_data = ""
+
+
+    def update_screendump_id(self, data_dir):
+        if not self.image_data:
+            return
+        # Find a proper ID for the screendump
+        scrdump_md5sum = ppm_utils.image_md5sum(self.image_width,
+                                                self.image_height,
+                                                self.image_data)
+        scrdump_id = ppm_utils.find_id_for_screendump(scrdump_md5sum, data_dir)
+        if not scrdump_id:
+            # Not found; generate one
+            scrdump_id = ppm_utils.generate_id_for_screendump(scrdump_md5sum,
+                                                              data_dir)
+        self.entry_screendump.set_text(scrdump_id)
+
+
+    def get_step_lines(self, data_dir=None):
+        if self.check_barrier.get_active() and not self.barrier_selected:
+            self.message("No barrier region selected.", "Error")
+            return
+
+        str = "step"
+
+        # Add step recording time
+        if self.entry_time.get_text():
+            str += " " + self.entry_time.get_text()
+
+        str += "\n"
+
+        # Add screendump line
+        if self.image_data:
+            str += "screendump %s\n" % self.entry_screendump.get_text()
+
+        # Add comment
+        if self.entry_comment.get_text():
+            str += "# %s\n" % self.entry_comment.get_text()
+
+        # Add sleep line
+        if self.check_sleep.get_active():
+            str += "sleep %d\n" % self.spin_sleep.get_value()
+
+        # Add barrier_2 line
+        if self.check_barrier.get_active():
+            str += "barrier_2 %d %d %d %d %s %d" % (
+                    self.barrier_size[0], self.barrier_size[1],
+                    self.barrier_corner[0], self.barrier_corner[1],
+                    self.barrier_md5sum, self.spin_barrier_timeout.get_value())
+            if self.check_barrier_optional.get_active():
+                str += " optional"
+            str += "\n"
+
+        # Add "Sending keys" comment
+        keys_to_send = self.get_keys().split()
+        if keys_to_send:
+            str += "# Sending keys: %s\n" % self.get_keys()
+
+        # Add key and var lines
+        for key in keys_to_send:
+            if key.startswith("$"):
+                varname = key[1:]
+                str += "var %s\n" % varname
+            else:
+                str += "key %s\n" % key
+
+        # Add mousemove line
+        if self.check_mousemove.get_active():
+            str += "mousemove %d %d\n" % (self.mouse_click_coords[0],
+                                          self.mouse_click_coords[1])
+
+        # Add mouseclick line
+        if self.check_mouseclick.get_active():
+            dict = { 1 : 1,
+                     2 : 2,
+                     3 : 4 }
+            str += "mouseclick %d\n" % dict[self.mouse_click_button]
+
+        # Write screendump and cropped screendump image files
+        if data_dir and self.image_data:
+            # Create the data dir if it doesn't exist
+            if not os.path.exists(data_dir):
+                os.makedirs(data_dir)
+            # Get the full screendump filename
+            scrdump_filename = os.path.join(data_dir,
+                                            self.entry_screendump.get_text())
+            # Write screendump file if it doesn't exist
+            if not os.path.exists(scrdump_filename):
+                try:
+                    ppm_utils.image_write_to_ppm_file(scrdump_filename,
+                                                      self.image_width,
+                                                      self.image_height,
+                                                      self.image_data)
+                except IOError:
+                    self.message("Could not write screendump file.", "Error")
+
+            #if self.check_barrier.get_active():
+            #    # Crop image to get the cropped screendump
+            #    (cw, ch, cdata) = ppm_utils.image_crop(
+            #            self.image_width, self.image_height, self.image_data,
+            #            self.barrier_corner[0], self.barrier_corner[1],
+            #            self.barrier_size[0], self.barrier_size[1])
+            #    cropped_scrdump_md5sum = ppm_utils.image_md5sum(cw, ch, cdata)
+            #    cropped_scrdump_filename = \
+            #    ppm_utils.get_cropped_screendump_filename(scrdump_filename,
+            #                                            cropped_scrdump_md5sum)
+            #    # Write cropped screendump file
+            #    try:
+            #        ppm_utils.image_write_to_ppm_file(cropped_scrdump_filename,
+            #                                          cw, ch, cdata)
+            #    except IOError:
+            #        self.message("Could not write cropped screendump file.",
+            #                     "Error")
+
+        return str
+
+    def set_state_from_step_lines(self, str, data_dir, warn=True):
+        self.clear_state()
+
+        for line in str.splitlines():
+            words = line.split()
+            if not words:
+                continue
+
+            if line.startswith("#") \
+                    and not self.entry_comment.get_text() \
+                    and not line.startswith("# Sending keys:") \
+                    and not line.startswith("# ----"):
+                self.entry_comment.set_text(line.strip("#").strip())
+
+            elif words[0] == "step":
+                if len(words) >= 2:
+                    self.entry_time.set_text(words[1])
+
+            elif words[0] == "screendump":
+                self.entry_screendump.set_text(words[1])
+                self.set_image_from_file(os.path.join(data_dir, words[1]))
+
+            elif words[0] == "sleep":
+                self.spin_sleep.set_value(int(words[1]))
+                self.check_sleep.set_active(True)
+
+            elif words[0] == "key":
+                self.add_key(words[1])
+
+            elif words[0] == "var":
+                self.add_key("$%s" % words[1])
+
+            elif words[0] == "mousemove":
+                self.mouse_click_captured = True
+                self.mouse_click_coords = [int(words[1]), int(words[2])]
+                self.update_mouse_click_info()
+
+            elif words[0] == "mouseclick":
+                self.mouse_click_captured = True
+                self.mouse_click_button = int(words[1])
+                self.update_mouse_click_info()
+
+            elif words[0] == "barrier_2":
+                # Get region corner and size from step lines
+                self.barrier_corner = [int(words[3]), int(words[4])]
+                self.barrier_size = [int(words[1]), int(words[2])]
+                # Get corner0 and corner1 from step lines
+                self.barrier_corner0 = self.barrier_corner
+                self.barrier_corner1 = [self.barrier_corner[0] +
+                                        self.barrier_size[0] - 1,
+                                        self.barrier_corner[1] +
+                                        self.barrier_size[1] - 1]
+                # Get the md5sum
+                self.barrier_md5sum = words[5]
+                # Pretend the user selected the region with the mouse
+                self.barrier_selection_started = True
+                self.barrier_selected = True
+                # Update label widgets according to region information
+                self.update_barrier_info()
+                # Check the barrier checkbutton
+                self.check_barrier.set_active(True)
+                # Set timeout value
+                self.spin_barrier_timeout.set_value(int(words[6]))
+                # Set 'optional' checkbutton state
+                self.check_barrier_optional.set_active(words[-1] == "optional")
+                # Update the image widget
+                self.event_box.queue_draw()
+
+                if warn:
+                    # See if the computed md5sum matches the one recorded in
+                    # the file
+                    computed_md5sum = ppm_utils.get_region_md5sum(
+                            self.image_width, self.image_height,
+                            self.image_data, self.barrier_corner[0],
+                            self.barrier_corner[1], self.barrier_size[0],
+                            self.barrier_size[1])
+                    if computed_md5sum != self.barrier_md5sum:
+                        self.message("Computed MD5 sum (%s) differs from MD5"
+                                     " sum recorded in steps file (%s)" %
+                                     (computed_md5sum, self.barrier_md5sum),
+                                     "Warning")
+
+    # Events
+
+    def delete_event(self, widget, event):
+        pass
+
+    def destroy(self, widget):
+        gtk.main_quit()
+
+    def event_check_barrier_toggled(self, widget):
+        if self.check_barrier.get_active():
+            self.redirect_event_box_input(
+                    self.event_button_press,
+                    self.event_button_release,
+                    None,
+                    None,
+                    self.event_expose)
+            self.event_box.queue_draw()
+            self.event_box.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.CROSSHAIR))
+            self.label_barrier_region.set_sensitive(True)
+            self.label_barrier_md5sum.set_sensitive(True)
+            self.label_barrier_timeout.set_sensitive(True)
+            self.spin_barrier_timeout.set_sensitive(True)
+            self.check_barrier_optional.set_sensitive(True)
+        else:
+            self.redirect_event_box_input()
+            self.event_box.queue_draw()
+            self.event_box.window.set_cursor(None)
+            self.label_barrier_region.set_sensitive(False)
+            self.label_barrier_md5sum.set_sensitive(False)
+            self.label_barrier_timeout.set_sensitive(False)
+            self.spin_barrier_timeout.set_sensitive(False)
+            self.check_barrier_optional.set_sensitive(False)
+
+    def event_check_sleep_toggled(self, widget):
+        if self.check_sleep.get_active():
+            self.spin_sleep.set_sensitive(True)
+        else:
+            self.spin_sleep.set_sensitive(False)
+
+    def event_manual_toggled(self, widget):
+        self.entry_keys.grab_focus()
+
+    def event_clear_clicked(self, widget):
+        self.clear_keys()
+        self.entry_keys.grab_focus()
+
+    def event_expose(self, widget, event):
+        if not self.barrier_selection_started:
+            return
+        (corner, size) = corner_and_size_clipped(self.barrier_corner0,
+                                                 self.barrier_corner1,
+                                                 self.event_box.size_request())
+        gc = self.event_box.window.new_gc(line_style=gtk.gdk.LINE_DOUBLE_DASH,
+                                          line_width=1)
+        gc.set_foreground(gc.get_colormap().alloc_color("red"))
+        gc.set_background(gc.get_colormap().alloc_color("dark red"))
+        gc.set_dashes(0, (4, 4))
+        self.event_box.window.draw_rectangle(
+                gc, False,
+                corner[0], corner[1],
+                size[0]-1, size[1]-1)
+
+    def event_drag_motion(self, widget, event):
+        old_corner1 = self.barrier_corner1
+        self.barrier_corner1 = [int(event.x), int(event.y)]
+        (corner, size) = corner_and_size_clipped(self.barrier_corner0,
+                                                 self.barrier_corner1,
+                                                 self.event_box.size_request())
+        (old_corner, old_size) = corner_and_size_clipped(self.barrier_corner0,
+                                                         old_corner1,
+                                                  self.event_box.size_request())
+        corner0 = [min(corner[0], old_corner[0]), min(corner[1], old_corner[1])]
+        corner1 = [max(corner[0] + size[0], old_corner[0] + old_size[0]),
+                   max(corner[1] + size[1], old_corner[1] + old_size[1])]
+        size = [corner1[0] - corner0[0] + 1,
+                corner1[1] - corner0[1] + 1]
+        self.event_box.queue_draw_area(corner0[0], corner0[1], size[0], size[1])
+
+    def event_button_press(self, widget, event):
+        (corner, size) = corner_and_size_clipped(self.barrier_corner0,
+                                                 self.barrier_corner1,
+                                                 self.event_box.size_request())
+        self.event_box.queue_draw_area(corner[0], corner[1], size[0], size[1])
+        self.barrier_corner0 = [int(event.x), int(event.y)]
+        self.barrier_corner1 = [int(event.x), int(event.y)]
+        self.redirect_event_box_input(
+                self.event_button_press,
+                self.event_button_release,
+                None,
+                self.event_drag_motion,
+                self.event_expose)
+        self.barrier_selection_started = True
+
+    def event_button_release(self, widget, event):
+        self.redirect_event_box_input(
+                self.event_button_press,
+                self.event_button_release,
+                None,
+                None,
+                self.event_expose)
+        (self.barrier_corner, self.barrier_size) = \
+        corner_and_size_clipped(self.barrier_corner0, self.barrier_corner1,
+                                self.event_box.size_request())
+        self.barrier_md5sum = ppm_utils.get_region_md5sum(
+                self.image_width, self.image_height, self.image_data,
+                self.barrier_corner[0], self.barrier_corner[1],
+                self.barrier_size[0], self.barrier_size[1])
+        self.barrier_selected = True
+        self.update_barrier_info()
+
+    def event_key_press(self, widget, event):
+        if self.check_manual.get_active():
+            return False
+        str = key_event_to_qemu_string(event)
+        self.add_key(str)
+        return True
+
+
+class StepEditor(StepMakerWindow):
+    ui = '''<ui>
+    <menubar name="MenuBar">
+      <menu action="File">
+        <menuitem action="Open"/>
+        <separator/>
+        <menuitem action="Quit"/>
+      </menu>
+      <menu action="Edit">
+        <menuitem action="CopyStep"/>
+        <menuitem action="DeleteStep"/>
+      </menu>
+      <menu action="Insert">
+        <menuitem action="InsertNewBefore"/>
+        <menuitem action="InsertNewAfter"/>
+        <separator/>
+        <menuitem action="InsertStepsBefore"/>
+        <menuitem action="InsertStepsAfter"/>
+      </menu>
+      <menu action="Tools">
+        <menuitem action="CleanUp"/>
+      </menu>
+    </menubar>
+    </ui>'''
+
+    # Constructor
+
+    def __init__(self, filename=None):
+        StepMakerWindow.__init__(self)
+
+        self.steps_filename = None
+        self.steps = []
+
+        # Create a UIManager instance
+        uimanager = gtk.UIManager()
+
+        # Add the accelerator group to the toplevel window
+        accelgroup = uimanager.get_accel_group()
+        self.window.add_accel_group(accelgroup)
+
+        # Create an ActionGroup
+        actiongroup = gtk.ActionGroup('UIManagerExample')
+
+        # Create actions
+        actiongroup.add_actions([
+            ('Quit', gtk.STOCK_QUIT, '_Quit', None, 'Quit the Program',
+             self.quit),
+            ('Open', gtk.STOCK_OPEN, '_Open', None, 'Open steps file',
+             self.open_steps_file),
+            ('CopyStep', gtk.STOCK_COPY, '_Copy current step...', None,
+             'Copy current step to user specified position', self.copy_step),
+            ('DeleteStep', gtk.STOCK_DELETE, '_Delete current step', None,
+             'Delete current step', self.event_remove_clicked),
+            ('InsertNewBefore', gtk.STOCK_ADD, '_New step before current', None,
+             'Insert new step before current step', self.insert_before),
+            ('InsertNewAfter', gtk.STOCK_ADD, 'N_ew step after current', None,
+             'Insert new step after current step', self.insert_after),
+            ('InsertStepsBefore', gtk.STOCK_ADD, '_Steps before current...',
+             None, 'Insert steps (from file) before current step',
+             self.insert_steps_before),
+            ('InsertStepsAfter', gtk.STOCK_ADD, 'Steps _after current...',
+             None, 'Insert steps (from file) after current step',
+             self.insert_steps_after),
+            ('CleanUp', gtk.STOCK_DELETE, '_Clean up data directory',
+             None, 'Move unused PPM files to a backup directory', self.cleanup),
+            ('File', None, '_File'),
+            ('Edit', None, '_Edit'),
+            ('Insert', None, '_Insert'),
+            ('Tools', None, '_Tools')
+            ])
+
+        def create_shortcut(name, callback, keyname):
+            # Create an action
+            action = gtk.Action(name, None, None, None)
+            # Connect a callback to the action
+            action.connect("activate", callback)
+            actiongroup.add_action_with_accel(action, keyname)
+            # Have the action use accelgroup
+            action.set_accel_group(accelgroup)
+            # Connect the accelerator to the action
+            action.connect_accelerator()
+
+        create_shortcut("Next", self.event_next_clicked, "Page_Down")
+        create_shortcut("Previous", self.event_prev_clicked, "Page_Up")
+        create_shortcut("First", self.event_first_clicked, "Home")
+        create_shortcut("Last", self.event_last_clicked, "End")
+        create_shortcut("Delete", self.event_remove_clicked, "Delete")
+
+        # Add the actiongroup to the uimanager
+        uimanager.insert_action_group(actiongroup, 0)
+
+        # Add a UI description
+        uimanager.add_ui_from_string(self.ui)
+
+        # Create a MenuBar
+        menubar = uimanager.get_widget('/MenuBar')
+        self.menu_vbox.pack_start(menubar, False)
+
+        # Remember the Edit menu bar for future reference
+        self.menu_edit = uimanager.get_widget('/MenuBar/Edit')
+        self.menu_edit.set_sensitive(False)
+
+        # Remember the Insert menu bar for future reference
+        self.menu_insert = uimanager.get_widget('/MenuBar/Insert')
+        self.menu_insert.set_sensitive(False)
+
+        # Remember the Tools menu bar for future reference
+        self.menu_tools = uimanager.get_widget('/MenuBar/Tools')
+        self.menu_tools.set_sensitive(False)
+
+        # Next/Previous HBox
+        hbox = gtk.HBox(spacing=10)
+        self.user_vbox.pack_start(hbox)
+        hbox.show()
+
+        self.button_first = gtk.Button(stock=gtk.STOCK_GOTO_FIRST)
+        self.button_first.connect("clicked", self.event_first_clicked)
+        hbox.pack_start(self.button_first)
+        self.button_first.show()
+
+        #self.button_prev = gtk.Button("<< Previous")
+        self.button_prev = gtk.Button(stock=gtk.STOCK_GO_BACK)
+        self.button_prev.connect("clicked", self.event_prev_clicked)
+        hbox.pack_start(self.button_prev)
+        self.button_prev.show()
+
+        self.label_step = gtk.Label("Step:")
+        hbox.pack_start(self.label_step, False)
+        self.label_step.show()
+
+        self.entry_step_num = gtk.Entry()
+        self.entry_step_num.connect("activate", self.event_entry_step_activated)
+        self.entry_step_num.set_width_chars(3)
+        hbox.pack_start(self.entry_step_num, False)
+        self.entry_step_num.show()
+
+        #self.button_next = gtk.Button("Next >>")
+        self.button_next = gtk.Button(stock=gtk.STOCK_GO_FORWARD)
+        self.button_next.connect("clicked", self.event_next_clicked)
+        hbox.pack_start(self.button_next)
+        self.button_next.show()
+
+        self.button_last = gtk.Button(stock=gtk.STOCK_GOTO_LAST)
+        self.button_last.connect("clicked", self.event_last_clicked)
+        hbox.pack_start(self.button_last)
+        self.button_last.show()
+
+        # Save HBox
+        hbox = gtk.HBox(spacing=10)
+        self.user_vbox.pack_start(hbox)
+        hbox.show()
+
+        self.button_save = gtk.Button("_Save current step")
+        self.button_save.connect("clicked", self.event_save_clicked)
+        hbox.pack_start(self.button_save)
+        self.button_save.show()
+
+        self.button_remove = gtk.Button("_Delete current step")
+        self.button_remove.connect("clicked", self.event_remove_clicked)
+        hbox.pack_start(self.button_remove)
+        self.button_remove.show()
+
+        self.button_replace = gtk.Button("_Replace screendump")
+        self.button_replace.connect("clicked", self.event_replace_clicked)
+        hbox.pack_start(self.button_replace)
+        self.button_replace.show()
+
+        # Disable unused widgets
+        self.button_capture.set_sensitive(False)
+        self.spin_latency.set_sensitive(False)
+        self.spin_sensitivity.set_sensitive(False)
+
+        # Disable main vbox because no steps file is loaded
+        self.main_vbox.set_sensitive(False)
+
+        # Set title
+        self.window.set_title("Step Editor")
+
+    # Events
+
+    def delete_event(self, widget, event):
+        # Make sure the step is saved (if the user wants it to be)
+        self.verify_save()
+
+    def event_first_clicked(self, widget):
+        if not self.steps:
+            return
+        # Make sure the step is saved (if the user wants it to be)
+        self.verify_save()
+        # Go to first step
+        self.set_step(0)
+
+    def event_last_clicked(self, widget):
+        if not self.steps:
+            return
+        # Make sure the step is saved (if the user wants it to be)
+        self.verify_save()
+        # Go to last step
+        self.set_step(len(self.steps) - 1)
+
+    def event_prev_clicked(self, widget):
+        if not self.steps:
+            return
+        # Make sure the step is saved (if the user wants it to be)
+        self.verify_save()
+        # Go to previous step
+        index = self.current_step_index - 1
+        if self.steps:
+            index = index % len(self.steps)
+        self.set_step(index)
+
+    def event_next_clicked(self, widget):
+        if not self.steps:
+            return
+        # Make sure the step is saved (if the user wants it to be)
+        self.verify_save()
+        # Go to next step
+        index = self.current_step_index + 1
+        if self.steps:
+            index = index % len(self.steps)
+        self.set_step(index)
+
+    def event_entry_step_activated(self, widget):
+        if not self.steps:
+            return
+        step_index = self.entry_step_num.get_text()
+        if not step_index.isdigit():
+            return
+        step_index = int(step_index) - 1
+        if step_index == self.current_step_index:
+            return
+        self.verify_save()
+        self.set_step(step_index)
+
+    def event_save_clicked(self, widget):
+        if not self.steps:
+            return
+        self.save_step()
+
+    def event_remove_clicked(self, widget):
+        if not self.steps:
+            return
+        if not self.question_yes_no("This will modify the steps file."
+                                    " Are you sure?", "Remove step?"):
+            return
+        # Remove step
+        del self.steps[self.current_step_index]
+        # Write changes to file
+        self.write_steps_file(self.steps_filename)
+        # Move to previous step
+        self.set_step(self.current_step_index)
+
+    def event_replace_clicked(self, widget):
+        if not self.steps:
+            return
+        # Let the user choose a screendump file
+        current_filename = os.path.join(self.steps_data_dir,
+                                        self.entry_screendump.get_text())
+        filename = self.filedialog("Choose PPM image file",
+                                   default_filename=current_filename)
+        if not filename:
+            return
+        if not ppm_utils.image_verify_ppm_file(filename):
+            self.message("Not a valid PPM image file.", "Error")
+            return
+        self.clear_image()
+        self.clear_barrier_state()
+        self.set_image_from_file(filename)
+        self.update_screendump_id(self.steps_data_dir)
+
+    # Menu actions
+
+    def open_steps_file(self, action):
+        # Make sure the step is saved (if the user wants it to be)
+        self.verify_save()
+        # Let the user choose a steps file
+        current_filename = self.steps_filename
+        filename = self.filedialog("Open steps file",
+                                   default_filename=current_filename)
+        if not filename:
+            return
+        self.set_steps_file(filename)
+
+    def quit(self, action):
+        # Make sure the step is saved (if the user wants it to be)
+        self.verify_save()
+        # Quit
+        gtk.main_quit()
+
+    def copy_step(self, action):
+        if not self.steps:
+            return
+        self.verify_save()
+        self.set_step(self.current_step_index)
+        # Get the desired position
+        step_index = self.inputdialog("Copy step to position:",
+                                      "Copy step",
+                                      str(self.current_step_index + 2))
+        if not step_index:
+            return
+        step_index = int(step_index) - 1
+        # Get the lines of the current step
+        step = self.steps[self.current_step_index]
+        # Insert new step at position step_index
+        self.steps.insert(step_index, step)
+        # Go to new step
+        self.set_step(step_index)
+        # Write changes to disk
+        self.write_steps_file(self.steps_filename)
+
+    def insert_before(self, action):
+        if not self.steps_filename:
+            return
+        if not self.question_yes_no("This will modify the steps file."
+                                    " Are you sure?", "Insert new step?"):
+            return
+        self.verify_save()
+        step_index = self.current_step_index
+        # Get the lines of a blank step
+        self.clear_state()
+        step = self.get_step_lines()
+        # Insert new step at position step_index
+        self.steps.insert(step_index, step)
+        # Go to new step
+        self.set_step(step_index)
+        # Write changes to disk
+        self.write_steps_file(self.steps_filename)
+
+    def insert_after(self, action):
+        if not self.steps_filename:
+            return
+        if not self.question_yes_no("This will modify the steps file."
+                                    " Are you sure?", "Insert new step?"):
+            return
+        self.verify_save()
+        step_index = self.current_step_index + 1
+        # Get the lines of a blank step
+        self.clear_state()
+        step = self.get_step_lines()
+        # Insert new step at position step_index
+        self.steps.insert(step_index, step)
+        # Go to new step
+        self.set_step(step_index)
+        # Write changes to disk
+        self.write_steps_file(self.steps_filename)
+
+    def insert_steps(self, filename, index):
+        # Read the steps file
+        (steps, header) = self.read_steps_file(filename)
+
+        data_dir = ppm_utils.get_data_dir(filename)
+        for step in steps:
+            self.set_state_from_step_lines(step, data_dir, warn=False)
+            step = self.get_step_lines(self.steps_data_dir)
+
+        # Insert steps into self.steps
+        self.steps[index:index] = steps
+        # Write changes to disk
+        self.write_steps_file(self.steps_filename)
+
+    def insert_steps_before(self, action):
+        if not self.steps_filename:
+            return
+        # Let the user choose a steps file
+        current_filename = self.steps_filename
+        filename = self.filedialog("Choose steps file",
+                                   default_filename=current_filename)
+        if not filename:
+            return
+        self.verify_save()
+
+        step_index = self.current_step_index
+        # Insert steps at position step_index
+        self.insert_steps(filename, step_index)
+        # Go to new steps
+        self.set_step(step_index)
+
+    def insert_steps_after(self, action):
+        if not self.steps_filename:
+            return
+        # Let the user choose a steps file
+        current_filename = self.steps_filename
+        filename = self.filedialog("Choose steps file",
+                                   default_filename=current_filename)
+        if not filename:
+            return
+        self.verify_save()
+
+        step_index = self.current_step_index + 1
+        # Insert new steps at position step_index
+        self.insert_steps(filename, step_index)
+        # Go to new steps
+        self.set_step(step_index)
+
+    def cleanup(self, action):
+        if not self.steps_filename:
+            return
+        if not self.question_yes_no("All unused PPM files will be moved to a"
+                                    " backup directory. Are you sure?",
+                                    "Clean up data directory?"):
+            return
+        # Remember the current step index
+        current_step_index = self.current_step_index
+        # Get the backup dir
+        backup_dir = os.path.join(self.steps_data_dir, "backup")
+        # Create it if it doesn't exist
+        if not os.path.exists(backup_dir):
+            os.makedirs(backup_dir)
+        # Move all files to the backup dir
+        for filename in glob.glob(os.path.join(self.steps_data_dir,
+                                               "*.[Pp][Pp][Mm]")):
+            shutil.move(filename, backup_dir)
+        # Get the used files back
+        for step in self.steps:
+            self.set_state_from_step_lines(step, backup_dir, warn=False)
+            self.get_step_lines(self.steps_data_dir)
+        # Remove the used files from the backup dir
+        used_files = os.listdir(self.steps_data_dir)
+        for filename in os.listdir(backup_dir):
+            if filename in used_files:
+                os.unlink(os.path.join(backup_dir, filename))
+        # Restore step index
+        self.set_step(current_step_index)
+        # Inform the user
+        self.message("All unused PPM files may be found at %s." %
+                     os.path.abspath(backup_dir),
+                     "Clean up data directory")
+
+    # Methods
+
+    def read_steps_file(self, filename):
+        steps = []
+        header = ""
+
+        file = open(filename, "r")
+        for line in file.readlines():
+            words = line.split()
+            if not words:
+                continue
+            if line.startswith("# ----"):
+                continue
+            if words[0] == "step":
+                steps.append("")
+            if steps:
+                steps[-1] += line
+            else:
+                header += line
+        file.close()
+
+        return (steps, header)
+
+    def set_steps_file(self, filename):
+        try:
+            (self.steps, self.header) = self.read_steps_file(filename)
+        except (TypeError, IOError):
+            self.message("Cannot read file %s." % filename, "Error")
+            return
+
+        self.steps_filename = filename
+        self.steps_data_dir = ppm_utils.get_data_dir(filename)
+        # Go to step 0
+        self.set_step(0)
+
+    def set_step(self, index):
+        # Limit index to legal boundaries
+        if index < 0:
+            index = 0
+        if index > len(self.steps) - 1:
+            index = len(self.steps) - 1
+
+        # Enable the menus
+        self.menu_edit.set_sensitive(True)
+        self.menu_insert.set_sensitive(True)
+        self.menu_tools.set_sensitive(True)
+
+        # If no steps exist...
+        if self.steps == []:
+            self.current_step_index = index
+            self.current_step = None
+            # Set window title
+            self.window.set_title("Step Editor -- %s" %
+                                  os.path.basename(self.steps_filename))
+            # Set step entry widget text
+            self.entry_step_num.set_text("")
+            # Clear the state of all widgets
+            self.clear_state()
+            # Disable the main vbox
+            self.main_vbox.set_sensitive(False)
+            return
+
+        self.current_step_index = index
+        self.current_step = self.steps[index]
+        # Set window title
+        self.window.set_title("Step Editor -- %s -- step %d" %
+                              (os.path.basename(self.steps_filename),
+                               index + 1))
+        # Set step entry widget text
+        self.entry_step_num.set_text(str(self.current_step_index + 1))
+        # Load the state from the step lines
+        self.set_state_from_step_lines(self.current_step, self.steps_data_dir)
+        # Enable the main vbox
+        self.main_vbox.set_sensitive(True)
+        # Make sure the step lines in self.current_step are identical to the
+        # output of self.get_step_lines
+        self.current_step = self.get_step_lines()
+
+    def verify_save(self):
+        if not self.steps:
+            return
+        # See if the user changed anything
+        if self.get_step_lines() != self.current_step:
+            if self.question_yes_no("Step contents have been modified."
+                                    " Save step?", "Save changes?"):
+                self.save_step()
+
+    def save_step(self):
+        lines = self.get_step_lines(self.steps_data_dir)
+        if lines != None:
+            self.steps[self.current_step_index] = lines
+            self.current_step = lines
+            self.write_steps_file(self.steps_filename)
+
+    def write_steps_file(self, filename):
+        file = open(filename, "w")
+        file.write(self.header)
+        for step in self.steps:
+            file.write("# " + "-" * 32 + "\n")
+            file.write(step)
+        file.close()
+
+
+if __name__ == "__main__":
+    se = StepEditor()
+    if len(sys.argv) > 1:
+        se.set_steps_file(sys.argv[1])
+    gtk.main()