Pileus Git - ~andy/gtk/blob - gtk/gtk-builder-convert

   1 #!/usr/bin/env python
   2 #
   3 # Copyright (C) 2006-2008 Async Open Source
   4 #                         Henrique Romano <henrique@async.com.br>
   5 #                         Johan Dahlin <jdahlin@async.com.br>
   6 #
   7 # This program is free software; you can redistribute it and/or
   8 # modify it under the terms of the GNU Lesser General Public License
   9 # as published by the Free Software Foundation; either version 2
  10 # of the License, or (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU Lesser General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20 #
  21 # TODO:
  22 #  Toolbars
  23
  24 """Usage: gtk-builder-convert [OPTION] [INPUT] [OUTPUT]
  25 Converts Glade files into XML files which can be loaded with GtkBuilder.
  26 The [INPUT] file is
  27
  28   -w, --skip-windows     Convert everything but GtkWindow subclasses.
  29   -r, --root             Convert only widget named root and its children
  30   -h, --help             display this help and exit
  31
  32 When OUTPUT is -, write to standard input.
  33
  34 Examples:
  35   gtk-builder-convert preference.glade preferences.ui
  36
  37 Report bugs to http://bugzilla.gnome.org/."""
  38
  39 import getopt
  40 import os
  41 import sys
  42
  43 from xml.dom import minidom, Node
  44
  45 WINDOWS = ['GtkWindow',
  46            'GtkDialog',
  47            'GtkFileChooserDialog',
  48            'GtkMessageDialog']
  49
  50 # The subprocess is only available in Python 2.4+
  51 try:
  52     import subprocess
  53     subprocess # pyflakes
  54 except ImportError:
  55     subprocess = None
  56
  57 def get_child_nodes(node):
  58     assert node.tagName == 'object'
  59     nodes = []
  60     for child in node.childNodes:
  61         if child.nodeType != Node.ELEMENT_NODE:
  62             continue
  63         if child.tagName != 'child':
  64             continue
  65         nodes.append(child)
  66     return nodes
  67
  68 def get_properties(node):
  69     assert node.tagName == 'object'
  70     properties = {}
  71     for child in node.childNodes:
  72         if child.nodeType != Node.ELEMENT_NODE:
  73             continue
  74         if child.tagName != 'property':
  75             continue
  76         value = child.childNodes[0].data
  77         properties[child.getAttribute('name')] = value
  78     return properties
  79
  80 def get_property(node, property_name):
  81     assert node.tagName == 'object'
  82     properties = get_properties(node)
  83     return properties.get(property_name)
  84
  85 def get_property_node(node, property_name):
  86     assert node.tagName == 'object'
  87     properties = {}
  88     for child in node.childNodes:
  89         if child.nodeType != Node.ELEMENT_NODE:
  90             continue
  91         if child.tagName != 'property':
  92             continue
  93         if child.getAttribute('name') == property_name:
  94             return child
  95
  96 def get_signal_nodes(node):
  97     assert node.tagName == 'object'
  98     signals = []
  99     for child in node.childNodes:
 100         if child.nodeType != Node.ELEMENT_NODE:
 101             continue
 102         if child.tagName == 'signal':
 103             signals.append(child)
 104     return signals
 105
 106 def get_property_nodes(node):
 107     assert node.tagName == 'object'
 108     properties = []
 109     for child in node.childNodes:
 110         if child.nodeType != Node.ELEMENT_NODE:
 111             continue
 112         # FIXME: handle comments
 113         if child.tagName == 'property':
 114             properties.append(child)
 115     return properties
 116
 117 def get_accelerator_nodes(node):
 118     assert node.tagName == 'object'
 119     accelerators = []
 120     for child in node.childNodes:
 121         if child.nodeType != Node.ELEMENT_NODE:
 122             continue
 123         if child.tagName == 'accelerator':
 124             accelerators.append(child)
 125     return accelerators
 126
 127 def get_object_node(child_node):
 128     assert child_node.tagName == 'child', child_node
 129     nodes = []
 130     for node in child_node.childNodes:
 131         if node.nodeType != Node.ELEMENT_NODE:
 132             continue
 133         if node.tagName == 'object':
 134             nodes.append(node)
 135     assert len(nodes) == 1, nodes
 136     return nodes[0]
 137
 138 def copy_properties(node, props, prop_dict):
 139     assert node.tagName == 'object'
 140     for prop_name in props:
 141         child = get_property_node(node, prop_name)
 142         if child is not None:
 143             prop_dict[prop_name] = child
 144
 145     return node
 146
 147 class GtkBuilderConverter(object):
 148
 149     def __init__(self, skip_windows, root):
 150         self.skip_windows = skip_windows
 151         self.root = root
 152         self.root_objects = []
 153         self.objects = {}
 154
 155     #
 156     # Public API
 157     #
 158
 159     def parse_file(self, file):
 160         self._dom = minidom.parse(file)
 161         self._parse()
 162
 163     def parse_buffer(self, buffer):
 164         self._dom = minidom.parseString(buffer)
 165         self._parse()
 166
 167     def to_xml(self):
 168         xml = self._dom.toprettyxml("", "")
 169         return xml.encode('utf-8')
 170
 171     #
 172     # Private
 173     #
 174
 175     def _get_object(self, name):
 176         return self.objects.get(name)
 177
 178     def _get_objects_by_attr(self, attribute, value):
 179         return [w for w in self._dom.getElementsByTagName("object")
 180                       if w.getAttribute(attribute) == value]
 181
 182     def _create_object(self, obj_class, obj_id, template=None, properties=None):
 183         """
 184         Creates a new <object> tag.
 185         Optionally a name template can be provided which will be used
 186         to avoid naming collisions.
 187         The properties dictionary can either contain string values or Node
 188         values. If a node is provided the name of the node will be overridden
 189         by the dictionary key.
 190
 191         @param obj_class: class of the object (class tag)
 192         @param obj_id: identifier of the object (id tag)
 193         @param template: name template to use, for example 'button'
 194         @param properties: dictionary of properties
 195         @type properties: string or Node.
 196         @returns: Newly created node of the object
 197         """
 198         if template is not None:
 199             count = 1
 200             while True:
 201                 obj_id = template + str(count)
 202                 widget = self._get_object(obj_id)
 203                 if widget is None:
 204                     break
 205
 206                 count += 1
 207
 208         obj = self._dom.createElement('object')
 209         obj.setAttribute('class', obj_class)
 210         obj.setAttribute('id', obj_id)
 211         if properties:
 212             for name, value in properties.items():
 213                 if isinstance(value, Node):
 214                     # Reuse the node, so translatable and context still will be
 215                     # set when converting nodes. See also #509153
 216                     prop = value
 217                 else:
 218                     prop = self._dom.createElement('property')
 219                     prop.appendChild(self._dom.createTextNode(value))
 220
 221                 prop.setAttribute('name', str(name))
 222                 obj.appendChild(prop)
 223         self.objects[obj_id] = obj
 224         return obj
 225
 226     def _create_root_object(self, obj_class, template, properties=None):
 227         obj = self._create_object(obj_class, None, template, properties)
 228         self.root_objects.append(obj)
 229         return obj
 230
 231     def _parse(self):
 232         glade_iface = self._dom.getElementsByTagName("glade-interface")
 233         assert glade_iface, ("Badly formed XML, there is "
 234                              "no <glade-interface> tag.")
 235         # Rename glade-interface to interface
 236         glade_iface[0].tagName = 'interface'
 237         self._interface = glade_iface[0]
 238
 239         # Remove glade-interface doc type
 240         for node in self._dom.childNodes:
 241             if node.nodeType == Node.DOCUMENT_TYPE_NODE:
 242                 if node.name == 'glade-interface':
 243                     self._dom.removeChild(node)
 244
 245         # Strip unsupported tags
 246         for tag in ['requires', 'requires-version']:
 247             for child in self._dom.getElementsByTagName(tag):
 248                 child.parentNode.removeChild(child)
 249
 250         if self.root:
 251             self._strip_root(self.root)
 252
 253         # Rename widget to object
 254         objects = self._dom.getElementsByTagName("widget")
 255         for node in objects:
 256             node.tagName = "object"
 257
 258         for node in objects:
 259             self._convert(node.getAttribute("class"), node)
 260             self.objects[node.getAttribute('id')] = node
 261
 262         # Convert Gazpachos UI tag
 263         for node in self._dom.getElementsByTagName("ui"):
 264             self._convert_ui(node)
 265
 266         # Convert accessibility tag
 267         for node in self._dom.getElementsByTagName("accessibility"):
 268             self._convert_accessibility(node)
 269
 270         # Output the newly created root objects and sort them
 271         # by attribute id
 272         # FIXME: Use sorted(self.root_objects,
 273         #                   key=lambda n: n.getAttribute('id'),
 274         #                   reverse=True):
 275         # when we can depend on python 2.4 or higher
 276         root_objects = self.root_objects[:]
 277         root_objects.sort(lambda a, b: cmp(b.getAttribute('id'),
 278                                            a.getAttribute('id')))
 279         for obj in root_objects:
 280             self._interface.childNodes.insert(0, obj)
 281
 282     def _convert(self, klass, node):
 283         if klass == 'GtkNotebook':
 284             self._packing_prop_to_child_attr(node, "type", "tab")
 285         elif klass in ['GtkExpander', 'GtkFrame']:
 286             self._packing_prop_to_child_attr(
 287                 node, "type", "label_item", "label")
 288         elif klass == "GtkMenuBar":
 289             self._convert_menu(node)
 290         elif klass == "GtkMenu":
 291             # Only convert toplevel popups
 292             if node.parentNode == self._interface:
 293                 self._convert_menu(node, popup=True)
 294         elif klass in WINDOWS and self.skip_windows:
 295             self._remove_window(node)
 296         self._default_widget_converter(node)
 297
 298     def _default_widget_converter(self, node):
 299         klass = node.getAttribute("class")
 300         for prop in get_property_nodes(node):
 301             prop_name = prop.getAttribute("name")
 302             if prop_name == "sizegroup":
 303                 self._convert_sizegroup(node, prop)
 304             elif prop_name == "tooltip" and klass != "GtkAction":
 305                 prop.setAttribute("name", "tooltip-text")
 306             elif prop_name in ["response_id", 'response-id']:
 307                 # It does not make sense to convert responses when
 308                 # we're not going to output dialogs
 309                 if self.skip_windows:
 310                     continue
 311                 object_id = node.getAttribute('id')
 312                 response = prop.childNodes[0].data
 313                 self._convert_dialog_response(node, object_id, response)
 314                 prop.parentNode.removeChild(prop)
 315             elif prop_name == "adjustment":
 316                 self._convert_adjustment(prop)
 317             elif prop_name == "items" and klass in ['GtkComboBox',
 318                                                     'GtkComboBoxEntry']:
 319                 self._convert_combobox_items(node, prop)
 320             elif prop_name == "text" and klass == 'GtkTextView':
 321                 self._convert_textview_text(prop)
 322
 323     def _remove_window(self, node):
 324         object_node = get_object_node(get_child_nodes(node)[0])
 325         parent = node.parentNode
 326         parent.removeChild(node)
 327         parent.appendChild(object_node)
 328
 329     def _convert_menu(self, node, popup=False):
 330         if node.hasAttribute('constructor'):
 331             return
 332
 333         uimgr = self._create_root_object('GtkUIManager',
 334                                          template='uimanager')
 335
 336         if popup:
 337             name = 'popup'
 338         else:
 339             name = 'menubar'
 340
 341         menu = self._dom.createElement(name)
 342         menu.setAttribute('name', node.getAttribute('id'))
 343         node.setAttribute('constructor', uimgr.getAttribute('id'))
 344
 345         for child in get_child_nodes(node):
 346             obj_node = get_object_node(child)
 347             item = self._convert_menuitem(uimgr, obj_node)
 348             menu.appendChild(item)
 349             child.removeChild(obj_node)
 350             child.parentNode.removeChild(child)
 351
 352         ui = self._dom.createElement('ui')
 353         uimgr.appendChild(ui)
 354
 355         ui.appendChild(menu)
 356
 357     def _convert_menuitem(self, uimgr, obj_node):
 358         children = get_child_nodes(obj_node)
 359         name = 'menuitem'
 360         if children:
 361             child_node = children[0]
 362             menu_node = get_object_node(child_node)
 363             # Can be GtkImage, which will take care of later.
 364             if menu_node.getAttribute('class') == 'GtkMenu':
 365                 name = 'menu'
 366
 367         object_class = obj_node.getAttribute('class')
 368         if object_class in ['GtkMenuItem',
 369                             'GtkImageMenuItem',
 370                             'GtkCheckMenuItem',
 371                             'GtkRadioMenuItem']:
 372             menu = self._dom.createElement(name)
 373         elif object_class == 'GtkSeparatorMenuItem':
 374             return self._dom.createElement('separator')
 375         else:
 376             raise NotImplementedError(object_class)
 377
 378         menu.setAttribute('action', obj_node.getAttribute('id'))
 379         self._add_action_from_menuitem(uimgr, obj_node)
 380         if children:
 381             for child in get_child_nodes(menu_node):
 382                 obj_node = get_object_node(child)
 383                 item = self._convert_menuitem(uimgr, obj_node)
 384                 menu.appendChild(item)
 385                 child.removeChild(obj_node)
 386                 child.parentNode.removeChild(child)
 387         return menu
 388
 389     def _menuitem_to_action(self, node, properties):
 390         copy_properties(node, ['label', 'tooltip'], properties)
 391
 392     def _togglemenuitem_to_action(self, node, properties):
 393         self._menuitem_to_action(node, properties)
 394         copy_properties(node, ['active'], properties)
 395
 396     def _radiomenuitem_to_action(self, node, properties):
 397         self._togglemenuitem_to_action(node, properties)
 398         copy_properties(node, ['group'], properties)
 399
 400     def _add_action_from_menuitem(self, uimgr, node):
 401         properties = {}
 402         object_class = node.getAttribute('class')
 403         object_id = node.getAttribute('id')
 404         if object_class == 'GtkMenuItem':
 405             name = 'GtkAction'
 406             self._menuitem_to_action(node, properties)
 407         elif object_class == 'GtkCheckMenuItem':
 408             name = 'GtkToggleAction'
 409             self._togglemenuitem_to_action(node, properties)
 410         elif object_class == 'GtkRadioMenuItem':
 411             name = 'GtkRadioAction'
 412             self._radiomenuitem_to_action(node, properties)
 413         elif object_class == 'GtkImageMenuItem':
 414             name = 'GtkAction'
 415             children = get_child_nodes(node)
 416             if (children and
 417                 children[0].getAttribute('internal-child') == 'image'):
 418                 image = get_object_node(children[0])
 419                 child = get_property_node(image, 'stock')
 420                 if child is not None:
 421                     properties['stock_id'] = child
 422             self._menuitem_to_action(node, properties)
 423         elif object_class == 'GtkSeparatorMenuItem':
 424             return
 425         else:
 426             raise NotImplementedError(object_class)
 427
 428         if get_property(node, 'use_stock') == 'True':
 429             if 'label' in properties:
 430                 properties['stock_id'] = properties['label']
 431                 del properties['label']
 432
 433         properties['name'] = object_id
 434         action = self._create_object(name,
 435                                      object_id,
 436                                      properties=properties)
 437         for signal in get_signal_nodes(node):
 438             signal_name = signal.getAttribute('name')
 439             if signal_name in ['activate', 'toggled']:
 440                 action.appendChild(signal)
 441             else:
 442                 print 'Unhandled signal %s::%s' % (node.getAttribute('class'),
 443                                                    signal_name)
 444
 445         if not uimgr.childNodes:
 446             child = self._dom.createElement('child')
 447             uimgr.appendChild(child)
 448
 449             group = self._create_object('GtkActionGroup', None,
 450                                         template='actiongroup')
 451             child.appendChild(group)
 452         else:
 453             group = uimgr.childNodes[0].childNodes[0]
 454
 455         child = self._dom.createElement('child')
 456         group.appendChild(child)
 457         child.appendChild(action)
 458
 459         for accelerator in get_accelerator_nodes(node):
 460             signal_name = accelerator.getAttribute('signal')
 461             if signal_name != 'activate':
 462                 print 'Unhandled accelerator signal for %s::%s' % (
 463                     node.getAttribute('class'), signal_name)
 464                 continue
 465             accelerator.removeAttribute('signal')
 466             child.appendChild(accelerator)
 467
 468     def _convert_sizegroup(self, node, prop):
 469         # This is Gazpacho only
 470         node.removeChild(prop)
 471         obj = self._get_object(prop.childNodes[0].data)
 472         if obj is None:
 473             widgets = self._get_objects_by_attr("class", "GtkSizeGroup")
 474             if widgets:
 475                 obj = widgets[-1]
 476             else:
 477                 obj = self._create_root_object('GtkSizeGroup',
 478                                                template='sizegroup')
 479
 480         widgets = obj.getElementsByTagName("widgets")
 481         if widgets:
 482             assert len(widgets) == 1
 483             widgets = widgets[0]
 484         else:
 485             widgets = self._dom.createElement("widgets")
 486             obj.appendChild(widgets)
 487
 488         member = self._dom.createElement("widget")
 489         member.setAttribute("name", node.getAttribute("id"))
 490         widgets.appendChild(member)
 491
 492     def _convert_dialog_response(self, node, object_name, response):
 493         # 1) Get parent dialog node
 494         while True:
 495             # If we can't find the parent dialog, give up
 496             if node == self._dom:
 497                 return
 498
 499             if (node.tagName == 'object' and
 500                 node.getAttribute('class') == 'GtkDialog'):
 501                 dialog = node
 502                 break
 503             node = node.parentNode
 504             assert node
 505
 506         # 2) Get dialogs action-widgets tag, create if not found
 507         for child in dialog.childNodes:
 508             if child.nodeType != Node.ELEMENT_NODE:
 509                 continue
 510             if child.tagName == 'action-widgets':
 511                 actions = child
 512                 break
 513         else:
 514             actions = self._dom.createElement("action-widgets")
 515             dialog.appendChild(actions)
 516
 517         # 3) Add action-widget tag for the response
 518         action = self._dom.createElement("action-widget")
 519         action.setAttribute("response", response)
 520         action.appendChild(self._dom.createTextNode(object_name))
 521         actions.appendChild(action)
 522
 523     def _convert_adjustment(self, prop):
 524         properties = {}
 525         if prop.childNodes:
 526             data = prop.childNodes[0].data
 527             value, lower, upper, step, page, page_size = data.split(' ')
 528             properties.update(value=value,
 529                               lower=lower,
 530                               upper=upper,
 531                               step_increment=step,
 532                               page_increment=page,
 533                               page_size=page_size)
 534         else:
 535             prop.appendChild(self._dom.createTextNode(""))
 536
 537         adj = self._create_root_object("GtkAdjustment",
 538                                        template='adjustment',
 539                                        properties=properties)
 540         prop.childNodes[0].data = adj.getAttribute('id')
 541
 542     def _convert_combobox_items(self, node, prop):
 543         parent = prop.parentNode
 544         if not prop.childNodes:
 545             parent.removeChild(prop)
 546             return
 547         value = prop.childNodes[0].data
 548         model = self._create_root_object("GtkListStore",
 549                                          template="model")
 550
 551         columns = self._dom.createElement('columns')
 552         model.appendChild(columns)
 553
 554         column = self._dom.createElement('column')
 555         column.setAttribute('type', 'gchararray')
 556         columns.appendChild(column)
 557
 558         data = self._dom.createElement('data')
 559         model.appendChild(data)
 560
 561         for item in value.split('\n'):
 562             row = self._dom.createElement('row')
 563             data.appendChild(row)
 564
 565             col = self._dom.createElement('col')
 566             col.setAttribute('id', '0')
 567             col.setAttribute('translatable', 'yes')
 568             col.appendChild(self._dom.createTextNode(item))
 569             row.appendChild(col)
 570
 571         model_prop = self._dom.createElement('property')
 572         model_prop.setAttribute('name', 'model')
 573         model_prop.appendChild(
 574             self._dom.createTextNode(model.getAttribute('id')))
 575         parent.appendChild(model_prop)
 576
 577         parent.removeChild(prop)
 578
 579         child = self._dom.createElement('child')
 580         node.appendChild(child)
 581         cell_renderer = self._create_object('GtkCellRendererText', None,
 582                                             template='renderer')
 583         child.appendChild(cell_renderer)
 584
 585         attributes = self._dom.createElement('attributes')
 586         child.appendChild(attributes)
 587
 588         attribute = self._dom.createElement('attribute')
 589         attributes.appendChild(attribute)
 590         attribute.setAttribute('name', 'text')
 591         attribute.appendChild(self._dom.createTextNode('0'))
 592
 593     def _convert_textview_text(self, prop):
 594         if not prop.childNodes:
 595             prop.parentNode.removeChild(prop)
 596             return
 597
 598         data = prop.childNodes[0].data
 599         if prop.hasAttribute('translatable'):
 600             prop.removeAttribute('translatable')
 601         tbuffer = self._create_root_object("GtkTextBuffer",
 602                                            template='textbuffer',
 603                                            properties=dict(text=data))
 604         prop.childNodes[0].data = tbuffer.getAttribute('id')
 605         prop.setAttribute('name', 'buffer')
 606
 607     def _packing_prop_to_child_attr(self, node, prop_name, prop_val,
 608                                    attr_val=None):
 609         for child in get_child_nodes(node):
 610             packing_props = [p for p in child.childNodes if p.nodeName == "packing"]
 611             if not packing_props:
 612                 continue
 613             assert len(packing_props) == 1
 614             packing_prop = packing_props[0]
 615             properties = packing_prop.getElementsByTagName("property")
 616             for prop in properties:
 617                 if (prop.getAttribute("name") != prop_name or
 618                     prop.childNodes[0].data != prop_val):
 619                     continue
 620                 packing_prop.removeChild(prop)
 621                 child.setAttribute(prop_name, attr_val or prop_val)
 622             if len(properties) == 1:
 623                 child.removeChild(packing_prop)
 624
 625     def _convert_ui(self, node):
 626         cdata = node.childNodes[0]
 627         data = cdata.toxml().strip()
 628         if not data.startswith("<![CDATA[") or not data.endswith("]]>"):
 629             return
 630         data = data[9:-3]
 631         child = minidom.parseString(data).childNodes[0]
 632         nodes = child.childNodes[:]
 633         for child_node in nodes:
 634             node.appendChild(child_node)
 635         node.removeChild(cdata)
 636         if not node.hasAttribute("id"):
 637             return
 638
 639         # Updating references made by widgets
 640         parent_id = node.parentNode.getAttribute("id")
 641         for widget in self._get_objects_by_attr("constructor",
 642                                                 node.getAttribute("id")):
 643             widget.getAttributeNode("constructor").value = parent_id
 644         node.removeAttribute("id")
 645
 646     def _convert_accessibility(self, node):
 647         objectNode = node.parentNode
 648         parent_id = objectNode.getAttribute("id")
 649
 650         properties = {}
 651         for node in node.childNodes:
 652             if node.nodeName == 'atkproperty':
 653                 node.tagName = 'property'
 654                 properties[node.getAttribute('name')] = node
 655                 node.parentNode.removeChild(node)
 656             elif node.nodeName == 'atkrelation':
 657                 node.tagName = 'relation'
 658                 relation_type = node.getAttribute('type')
 659                 relation_type = relation_type.replace('_', '-')
 660                 node.setAttribute('type', relation_type)
 661             elif node.nodeName == 'atkaction':
 662                 node.tagName = 'action'
 663
 664         if properties:
 665             child = self._dom.createElement('child')
 666             child.setAttribute("internal-child", "accessible")
 667
 668             atkobject = self._create_object(
 669                 "AtkObject", None,
 670                 template='a11y-%s' % (parent_id,),
 671                 properties=properties)
 672             child.appendChild(atkobject)
 673             objectNode.appendChild(child)
 674
 675     def _strip_root(self, root_name):
 676         for widget in self._dom.getElementsByTagName("widget"):
 677             if widget.getAttribute('id') == root_name:
 678                 break
 679         else:
 680             raise SystemExit("Could not find an object called `%s'" % (
 681                 root_name))
 682
 683         for child in self._interface.childNodes[:]:
 684             if child.nodeType != Node.ELEMENT_NODE:
 685                 continue
 686             child.parentNode.removeChild(child)
 687
 688         self._interface.appendChild(widget)
 689
 690
 691 def _indent(output):
 692     if not subprocess:
 693         return output
 694
 695     for directory in os.environ['PATH'].split(os.pathsep):
 696         filename = os.path.join(directory, 'xmllint')
 697         if os.path.exists(filename):
 698             break
 699     else:
 700         return output
 701
 702     s = subprocess.Popen([filename, '--format', '-'],
 703                          stdin=subprocess.PIPE,
 704                          stdout=subprocess.PIPE)
 705     s.stdin.write(output)
 706     s.stdin.close()
 707     return s.stdout.read()
 708
 709 def usage():
 710     print __doc__
 711
 712 def main(args):
 713     try:
 714         opts, args = getopt.getopt(args[1:], "hwr:",
 715                                    ["help", "skip-windows", "root="])
 716     except getopt.GetoptError:
 717         usage()
 718         return 2
 719
 720     if len(args) != 2:
 721         usage()
 722         return 2
 723
 724     input_filename, output_filename = args
 725
 726     skip_windows = False
 727     split = False
 728     root = None
 729     for o, a in opts:
 730         if o in ("-h", "--help"):
 731             usage()
 732             sys.exit()
 733         elif o in ("-r", "--root"):
 734             root = a
 735         elif o in ("-w", "--skip-windows"):
 736             skip_windows = True
 737
 738     conv = GtkBuilderConverter(skip_windows=skip_windows,
 739                                root=root)
 740     conv.parse_file(input_filename)
 741
 742     xml = _indent(conv.to_xml())
 743     if output_filename == "-":
 744         print xml
 745     else:
 746         open(output_filename, 'w').write(xml)
 747         print "Wrote", output_filename
 748
 749     return 0
 750
 751 if __name__ == "__main__":
 752     sys.exit(main(sys.argv))