node_efficiency_tools.py

        valid = False
        if (space.type == 'NODE_EDITOR' and
                space.node_tree is not None and
                context.active_node is not None and
                context.active_node.type is not 'FRAME'
                ):
            valid = True
        return valid

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        selected = [n for n in nodes if n.select]
        reselect = []  # duplicated nodes will be selected after execution
        active = nodes.active
        if active.select:
            reselect.append(active)

        for node in selected:
            if node.type == active.type and node != active:
                # duplicate active, relink links as in 'node', append copy to 'reselect', delete node
                bpy.ops.node.select_all(action='DESELECT')
                nodes.active = active
                active.select = True
                bpy.ops.node.duplicate()
                copied = nodes.active
                # Copied active should however inherit some properties from 'node'
                attributes = (
                    'hide', 'show_preview', 'mute', 'label',
                    'use_custom_color', 'color', 'width', 'width_hidden',
                )
                for attr in attributes:
                    setattr(copied, attr, getattr(node, attr))
                # Handle scenario when 'node' is in frame. 'copied' is in same frame then.
                if copied.parent:
                    bpy.ops.node.parent_clear()
                locx = node.location.x
                locy = node.location.y
                # get absolute node location
                parent = node.parent
                while parent:
                    locx += parent.location.x
                    locy += parent.location.y
                    parent = parent.parent
                copied.location = [locx, locy]
                # reconnect links from node to copied
                for i, input in enumerate(node.inputs):
                    if input.links:
                        link = input.links[0]
                        links.new(link.from_socket, copied.inputs[i])
                for out, output in enumerate(node.outputs):
                    if output.links:
                        out_links = output.links
                        for link in out_links:
                            links.new(copied.outputs[out], link.to_socket)
                bpy.ops.node.select_all(action='DESELECT')
                node.select = True
                bpy.ops.node.delete()
                reselect.append(copied)
            else:  # If selected wasn't copied, need to reselect it afterwards.
                reselect.append(node)
        # clean up
        bpy.ops.node.select_all(action='DESELECT')
        for node in reselect:
            node.select = True
        nodes.active = active

        return {'FINISHED'}


class NWCopyLabel(Operator, NWBase):
    bl_idname = "node.nw_copy_label"
    bl_label = "Copy Label"
    bl_options = {'REGISTER', 'UNDO'}

    option = EnumProperty(
        name="option",
        description="Source of name of label",
        items=(
            ('FROM_ACTIVE', 'from active', 'from active node',),
            ('FROM_NODE', 'from node', 'from node linked to selected node'),
            ('FROM_SOCKET', 'from socket', 'from socket linked to selected node'),
        )
    )

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        option = self.option
        active = nodes.active
        if option == 'FROM_ACTIVE':
            if active:
                src_label = active.label
                for node in [n for n in nodes if n.select and nodes.active != n]:
                    node.label = src_label
        elif option == 'FROM_NODE':
            selected = [n for n in nodes if n.select]
            for node in selected:
                for input in node.inputs:
                    if input.links:
                        src = input.links[0].from_node
                        node.label = src.label
                        break
        elif option == 'FROM_SOCKET':
            selected = [n for n in nodes if n.select]
            for node in selected:
                for input in node.inputs:
                    if input.links:
                        src = input.links[0].from_socket
                        node.label = src.name
                        break

        return {'FINISHED'}


class NWClearLabel(Operator, NWBase):
    bl_idname = "node.nw_clear_label"
    bl_label = "Clear Label"
    bl_options = {'REGISTER', 'UNDO'}

    option = BoolProperty()

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        for node in [n for n in nodes if n.select]:
            node.label = ''

        return {'FINISHED'}

    def invoke(self, context, event):
        if self.option:
            return self.execute(context)
        else:
            return context.window_manager.invoke_confirm(self, event)


class NWModifyLabels(Operator, NWBase):
    """Modify Labels of all selected nodes."""
    bl_idname = "node.nw_modify_labels"
    bl_label = "Modify Labels"
    bl_options = {'REGISTER', 'UNDO'}

    prepend = StringProperty(
        name="Add to Beginning"
    )
    append = StringProperty(
        name="Add to End"
    )
    replace_from = StringProperty(
        name="Text to Replace"
    )
    replace_to = StringProperty(
        name="Replace with"
    )

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        for node in [n for n in nodes if n.select]:
            node.label = self.prepend + node.label.replace(self.replace_from, self.replace_to) + self.append

        return {'FINISHED'}

    def invoke(self, context, event):
        self.prepend = ""
        self.append = ""
        self.remove = ""
        return context.window_manager.invoke_props_dialog(self)


class NWAddTextureSetup(Operator, NWBase):
    bl_idname = "node.nw_add_texture"
    bl_label = "Texture Setup"
    bl_description = "Add Texture Node Setup to Selected Shaders"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        space = context.space_data
        valid = False
        if space.type == 'NODE_EDITOR':
            if space.tree_type == 'ShaderNodeTree' and space.node_tree is not None:
                valid = True
        return valid

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        active = nodes.active
        shader_types = [x[1] for x in shaders_shader_nodes_props if x[1] not in {'MIX_SHADER', 'ADD_SHADER'}]
        texture_types = [x[1] for x in shaders_texture_nodes_props]
        valid = False
        if active:
            if active.select:
                if active.type in shader_types or active.type in texture_types:
                    if not active.inputs[0].is_linked:
                        valid = True
        if valid:
            locx = active.location.x
            locy = active.location.y

            xoffset = [500.0, 700.0]
            isshader = True
            if active.type not in shader_types:
                xoffset = [290.0, 500.0]
                isshader = False

            coordout = 2
            image_type = 'ShaderNodeTexImage'

            if (active.type in texture_types and active.type != 'TEX_IMAGE') or (active.type == 'BACKGROUND'):
                coordout = 0  # image texture uses UVs, procedural textures and Background shader use Generated
                if active.type == 'BACKGROUND':
                    image_type = 'ShaderNodeTexEnvironment'

            if isshader:
                tex = nodes.new(image_type)
                tex.location = [locx - 200.0, locy + 28.0]

            map = nodes.new('ShaderNodeMapping')
            map.location = [locx - xoffset[0], locy + 80.0]
            map.width = 240
            coord = nodes.new('ShaderNodeTexCoord')
            coord.location = [locx - xoffset[1], locy + 40.0]
            active.select = False

            if isshader:
                nodes.active = tex
                links.new(tex.outputs[0], active.inputs[0])
                links.new(map.outputs[0], tex.inputs[0])
                links.new(coord.outputs[coordout], map.inputs[0])

            else:
                nodes.active = map
                links.new(map.outputs[0], active.inputs[0])
                links.new(coord.outputs[coordout], map.inputs[0])

        return {'FINISHED'}


class NWAddReroutes(Operator, NWBase):
    """Add Reroute Nodes and link them to outputs of selected nodes"""
    bl_idname = "node.nw_add_reroutes"
    bl_label = "Add Reroutes"
    bl_description = "Add Reroutes to Outputs"
    bl_options = {'REGISTER', 'UNDO'}

    option = EnumProperty(
        name="option",
        items=[
            ('ALL', 'to all', 'Add to all outputs'),
            ('LOOSE', 'to loose', 'Add only to loose outputs'),
            ('LINKED', 'to linked', 'Add only to linked outputs'),
        ]
    )

    def execute(self, context):
        tree_type = context.space_data.node_tree.type
        option = self.option
        nodes, links = get_nodes_links(context)
        # output valid when option is 'all' or when 'loose' output has no links
        valid = False
        post_select = []  # nodes to be selected after execution
        # create reroutes and recreate links
        for node in [n for n in nodes if n.select]:
            if node.outputs:
                x = node.location.x
                y = node.location.y
                width = node.width
                # unhide 'REROUTE' nodes to avoid issues with location.y
                if node.type == 'REROUTE':
                    node.hide = False
                # When node is hidden - width_hidden not usable.
                # Hack needed to calculate real width
                if node.hide:
                    bpy.ops.node.select_all(action='DESELECT')
                    helper = nodes.new('NodeReroute')
                    helper.select = True
                    node.select = True
                    # resize node and helper to zero. Then check locations to calculate width
                    bpy.ops.transform.resize(value=(0.0, 0.0, 0.0))
                    width = 2.0 * (helper.location.x - node.location.x)
                    # restore node location
                    node.location = x, y
                    # delete helper
                    node.select = False
                    # only helper is selected now
                    bpy.ops.node.delete()
                x = node.location.x + width + 20.0
                if node.type != 'REROUTE':
                    y -= 35.0
                y_offset = -22.0
                loc = x, y
            reroutes_count = 0  # will be used when aligning reroutes added to hidden nodes
            for out_i, output in enumerate(node.outputs):
                pass_used = False  # initial value to be analyzed if 'R_LAYERS'
                # if node is not 'R_LAYERS' - "pass_used" not needed, so set it to True
                if node.type != 'R_LAYERS':
                    pass_used = True
                else:  # if 'R_LAYERS' check if output represent used render pass
                    node_scene = node.scene
                    node_layer = node.layer
                    # If output - "Alpha" is analyzed - assume it's used. Not represented in passes.
                    if output.name == 'Alpha':
                        pass_used = True
                    else:
                        # check entries in global 'rl_outputs' variable
                        for render_pass, out_name, exr_name, in_internal, in_cycles in rl_outputs:
                            if output.name == out_name:
                                pass_used = getattr(node_scene.render.layers[node_layer], render_pass)
                                break
                if pass_used:
                    valid = ((option == 'ALL') or
                             (option == 'LOOSE' and not output.links) or
                             (option == 'LINKED' and output.links))
                    # Add reroutes only if valid, but offset location in all cases.
                    if valid:
                        n = nodes.new('NodeReroute')
                        nodes.active = n
                        for link in output.links:
                            links.new(n.outputs[0], link.to_socket)
                        links.new(output, n.inputs[0])
                        n.location = loc
                        post_select.append(n)
                    reroutes_count += 1
                    y += y_offset
                    loc = x, y
            # disselect the node so that after execution of script only newly created nodes are selected
            node.select = False
            # nicer reroutes distribution along y when node.hide
            if node.hide:
                y_translate = reroutes_count * y_offset / 2.0 - y_offset - 35.0
                for reroute in [r for r in nodes if r.select]:
                    reroute.location.y -= y_translate
            for node in post_select:
                node.select = True

        return {'FINISHED'}


class NWLinkActiveToSelected(Operator, NWBase):
    """Link active node to selected nodes basing on various criteria"""
    bl_idname = "node.nw_link_active_to_selected"
    bl_label = "Link Active Node to Selected"
    bl_options = {'REGISTER', 'UNDO'}

    replace = BoolProperty()
    use_node_name = BoolProperty()
    use_outputs_names = BoolProperty()

    @classmethod
    def poll(cls, context):
        space = context.space_data
        valid = False
        if space.type == 'NODE_EDITOR':
            if space.node_tree is not None and context.active_node is not None:
                if context.active_node.select:
                    valid = True
        return valid

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        replace = self.replace
        use_node_name = self.use_node_name
        use_outputs_names = self.use_outputs_names
        active = nodes.active
        selected = [node for node in nodes if node.select and node != active]
        outputs = []  # Only usable outputs of active nodes will be stored here.
        for out in active.outputs:
            if active.type != 'R_LAYERS':
                outputs.append(out)
            else:
                # 'R_LAYERS' node type needs special handling.
                # outputs of 'R_LAYERS' are callable even if not seen in UI.
                # Only outputs that represent used passes should be taken into account
                # Check if pass represented by output is used.
                # global 'rl_outputs' list will be used for that
                for render_pass, out_name, exr_name, in_internal, in_cycles in rl_outputs:
                    pass_used = False  # initial value. Will be set to True if pass is used
                    if out.name == 'Alpha':
                        # Alpha output is always present. Doesn't have representation in render pass. Assume it's used.
                        pass_used = True
                    elif out.name == out_name:
                        # example 'render_pass' entry: 'use_pass_uv' Check if True in scene render layers
                        pass_used = getattr(active.scene.render.layers[active.layer], render_pass)
                        break
                if pass_used:
                    outputs.append(out)
        doit = True  # Will be changed to False when links successfully added to previous output.
        for out in outputs:
            if doit:
                for node in selected:
                    dst_name = node.name  # Will be compared with src_name if needed.
                    # When node has label - use it as dst_name
                    if node.label:
                        dst_name = node.label
                    valid = True  # Initial value. Will be changed to False if names don't match.
                    src_name = dst_name  # If names not used - this asignment will keep valid = True.
                    if use_node_name:
                        # Set src_name to source node name or label
                        src_name = active.name
                        if active.label:
                            src_name = active.label
                    elif use_outputs_names:
                        src_name = (out.name, )
                        for render_pass, out_name, exr_name, in_internal, in_cycles in rl_outputs:
                            if out.name in {out_name, exr_name}:
                                src_name = (out_name, exr_name)
                    if dst_name not in src_name:
                        valid = False
                    if valid:
                        for input in node.inputs:
                            if input.type == out.type or node.type == 'REROUTE':
                                if replace or not input.is_linked:
                                    links.new(out, input)
                                    if not use_node_name and not use_outputs_names:
                                        doit = False
                                    break

        return {'FINISHED'}


class NWAlignNodes(Operator, NWBase):
    bl_idname = "node.nw_align_nodes"
    bl_label = "Align nodes"
    bl_options = {'REGISTER', 'UNDO'}

    # option: 'Vertically', 'Horizontally'
    option = EnumProperty(
        name="option",
        description="Direction",
        items=(
            ('AXIS_X', "Align Vertically", 'Align Vertically'),
            ('AXIS_Y', "Aligh Horizontally", 'Aligh Horizontally'),
        )
    )

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        selected = []  # entry = [index, loc.x, loc.y, width, height]
        frames_reselect = []  # entry = frame node. will be used to reselect all selected frames
        active = nodes.active
        for i, node in enumerate(nodes):
            total_w = 0.0  # total width of all nodes. Will be calculated later.
            total_h = 0.0  # total height of all nodes. Will be calculated later
            if node.select:
                if node.type == 'FRAME':
                    node.select = False
                    frames_reselect.append(i)
                else:
                    locx = node.location.x
                    locy = node.location.y
                    width = node.dimensions[0]
                    height = node.dimensions[1]
                    total_w += width  # add nodes[i] width to total width of all nodes
                    total_h += height  # add nodes[i] height to total height of all nodes
                    # calculate relative locations
                    parent = node.parent
                    while parent is not None:
                        locx += parent.location.x
                        locy += parent.location.y
                        parent = parent.parent
                    selected.append([i, locx, locy, width, height])
        count = len(selected)
        if count > 1:  # aligning makes sense only if at least 2 nodes are selected
            selected_sorted_x = sorted(selected, key=lambda k: (k[1], -k[2]))
            selected_sorted_y = sorted(selected, key=lambda k: (-k[2], k[1]))
            min_x = selected_sorted_x[0][1]  # min loc.x
            min_x_loc_y = selected_sorted_x[0][2]  # loc y of node with min loc x
            min_x_w = selected_sorted_x[0][3]  # width of node with max loc x
            max_x = selected_sorted_x[count - 1][1]  # max loc.x
            max_x_loc_y = selected_sorted_x[count - 1][2]  # loc y of node with max loc.x
            max_x_w = selected_sorted_x[count - 1][3]  # width of node with max loc.x
            min_y = selected_sorted_y[0][2]  # min loc.y
            min_y_loc_x = selected_sorted_y[0][1]  # loc.x of node with min loc.y
            min_y_h = selected_sorted_y[0][4]  # height of node with min loc.y
            min_y_w = selected_sorted_y[0][3]  # width of node with min loc.y
            max_y = selected_sorted_y[count - 1][2]  # max loc.y
            max_y_loc_x = selected_sorted_y[count - 1][1]  # loc x of node with max loc.y
            max_y_w = selected_sorted_y[count - 1][3]  # width of node with max loc.y
            max_y_h = selected_sorted_y[count - 1][4]  # height of node with max loc.y

            if self.option == 'AXIS_Y':  # Horizontally. Equivelent of s -> x -> 0 with even spacing.
                loc_x = min_x
                #loc_y = (max_x_loc_y + min_x_loc_y) / 2.0
                loc_y = (max_y - max_y_h / 2.0 + min_y - min_y_h / 2.0) / 2.0
                offset_x = (max_x - min_x - total_w + max_x_w) / (count - 1)
                for i, x, y, w, h in selected_sorted_x:
                    nodes[i].location.x = loc_x
                    nodes[i].location.y = loc_y + h / 2.0
                    parent = nodes[i].parent
                    while parent is not None:
                        nodes[i].location.x -= parent.location.x
                        nodes[i].location.y -= parent.location.y
                        parent = parent.parent
                    loc_x += offset_x + w
            else:  # if self.option == 'AXIS_Y'
                loc_x = (max_x + max_x_w / 2.0 + min_x + min_x_w / 2.0) / 2.0
                loc_y = min_y
                offset_y = (max_y - min_y + total_h - min_y_h) / (count - 1)
                for i, x, y, w, h in selected_sorted_y:
                    nodes[i].location.x = loc_x - w / 2.0
                    nodes[i].location.y = loc_y
                    parent = nodes[i].parent
                    while parent is not None:
                        nodes[i].location.x -= parent.location.x
                        nodes[i].location.y -= parent.location.y
                        parent = parent.parent
                    loc_y += offset_y - h

            # reselect selected frames
            for i in frames_reselect:
                nodes[i].select = True
            # restore active node
            nodes.active = active

        return {'FINISHED'}


class NWSelectParentChildren(Operator, NWBase):
    bl_idname = "node.nw_select_parent_child"
    bl_label = "Select Parent or Children"
    bl_options = {'REGISTER', 'UNDO'}

    option = EnumProperty(
        name="option",
        items=(
            ('PARENT', 'Select Parent', 'Select Parent Frame'),
            ('CHILD', 'Select Children', 'Select members of selected frame'),
        )
    )

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        option = self.option
        selected = [node for node in nodes if node.select]
        if option == 'PARENT':
            for sel in selected:
                parent = sel.parent
                if parent:
                    parent.select = True
        else:  # option == 'CHILD'
            for sel in selected:
                children = [node for node in nodes if node.parent == sel]
                for kid in children:
                    kid.select = True

        return {'FINISHED'}


class NWDetachOutputs(Operator, NWBase):
    """Detach outputs of selected node leaving inluts liked"""
    bl_idname = "node.nw_detach_outputs"
    bl_label = "Detach Outputs"
    bl_options = {'REGISTER', 'UNDO'}

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        selected = context.selected_nodes
        bpy.ops.node.duplicate_move_keep_inputs()
        new_nodes = context.selected_nodes
        bpy.ops.node.select_all(action="DESELECT")
        for node in selected:
            node.select = True
        bpy.ops.node.delete_reconnect()
        for new_node in new_nodes:
            new_node.select = True
        bpy.ops.transform.translate('INVOKE_DEFAULT')

        return {'FINISHED'}


class NWLinkToOutputNode(Operator, NWBase):
    """Link to Composite node or Material Output node"""
    bl_idname = "node.nw_link_out"
    bl_label = "Connect to Output"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        space = context.space_data
        return (space.type == 'NODE_EDITOR' and space.node_tree is not None and context.active_node is not None)

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        active = nodes.active
        output_node = None
        tree_type = context.space_data.tree_type
        output_types_shaders = [x[1] for x in shaders_output_nodes_props]
        output_types_compo = ['COMPOSITE']
        output_types = output_types_shaders + output_types_compo
        for node in nodes:
            if node.type in output_types:
                output_node = node
                break
        if not output_node:
            bpy.ops.node.select_all(action="DESELECT")
            if tree_type == 'ShaderNodeTree':
                output_node = nodes.new('ShaderNodeOutputMaterial')
            elif tree_type == 'CompositorNodeTree':
                output_node = nodes.new('CompositorNodeComposite')
            output_node.location.x = active.location.x + active.dimensions.x + 80
            output_node.location.y = active.location.y
        if (output_node and active.outputs):
            output_index = 0
            for i, output in enumerate(active.outputs):
                if output.type == output_node.inputs[0].type:
                    output_index = i
                    break

            out_input_index = 0
            if tree_type == 'ShaderNodeTree':
                if active.outputs[output_index].type != 'SHADER':  # connect to displacement if not a shader
                    out_input_index = 2
            links.new(active.outputs[output_index], output_node.inputs[out_input_index])

        hack_force_update(context, nodes)  # viewport render does not update

        return {'FINISHED'}


class NWMakeLink(Operator, NWBase):
    """Make a link from one socket to another"""
    bl_idname = 'node.nw_make_link'
    bl_label = 'Make Link'
    bl_options = {'REGISTER', 'UNDO'}
    from_socket = IntProperty()
    to_socket = IntProperty()

    @classmethod
    def poll(cls, context):
        snode = context.space_data
        return (snode.type == 'NODE_EDITOR' and snode.node_tree is not None)

    def execute(self, context):
        nodes, links = get_nodes_links(context)

        n1 = nodes[context.scene.NWLazySource]
        n2 = nodes[context.scene.NWLazyTarget]

        links.new(n1.outputs[self.from_socket], n2.inputs[self.to_socket])

        hack_force_update(context, nodes)

        return {'FINISHED'}


class NWCallInputsMenu(Operator, NWBase):
    """Link from this output"""
    bl_idname = 'node.nw_call_inputs_menu'
    bl_label = 'Make Link'
    bl_options = {'REGISTER', 'UNDO'}
    from_socket = IntProperty()

    @classmethod
    def poll(cls, context):
        snode = context.space_data
        return (snode.type == 'NODE_EDITOR' and snode.node_tree is not None)

    def execute(self, context):
        nodes, links = get_nodes_links(context)

        context.scene.NWSourceSocket = self.from_socket

        n1 = nodes[context.scene.NWLazySource]
        n2 = nodes[context.scene.NWLazyTarget]
        if len(n2.inputs) > 1:
            bpy.ops.wm.call_menu("INVOKE_DEFAULT", name=NWConnectionListInputs.bl_idname)
        elif len(n2.inputs) == 1:
            links.new(n1.outputs[self.from_socket], n2.inputs[0])
        return {'FINISHED'}


class NWAddSequence(Operator, ImportHelper):
    """Add an Image Sequence"""
    bl_idname = 'node.nw_add_sequence'
    bl_label = 'Import Image Sequence'
    bl_options = {'REGISTER', 'UNDO'}
    directory = StringProperty(subtype="DIR_PATH")
    filename = StringProperty(subtype="FILE_NAME")

    @classmethod
    def poll(cls, context):
        snode = context.space_data
        return (snode.type == 'NODE_EDITOR' and snode.node_tree is not None)

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        directory = self.directory
        filename = self.filename


        if context.space_data.node_tree.type == 'SHADER':
            node_type = "ShaderNodeTexImage"
        elif context.space_data.node_tree.type == 'COMPOSITING':
            node_type = "CompositorNodeImage"
        else:
            self.report({'ERROR'}, "Unsupported Node Tree type!")
            return {'CANCELLED'}

        # if last digit isn't a number, it's not a sequence
        without_ext = '.'.join(filename.split('.')[:-1])
        if without_ext[-1].isdigit():
            without_ext = without_ext[:-1] + '1'
        else:
            self.report({'ERROR'}, filename+" does not seem to be part of a sequence")
            return {'CANCELLED'}

        reverse = without_ext[::-1] # reverse string
        newreverse = ""
        non_numbers = ""
        count_numbers = 0
        stop = False
        for char in reverse:
            if char.isdigit() and stop==False:
                count_numbers += 1
                newreverse += '0'  # replace numbers of image sequence with zeros
            else:
                stop = True
                newreverse += char
                non_numbers = char + non_numbers

        newreverse = '1' + newreverse[1:]
        without_ext = newreverse[::-1] # reverse string

        # print (without_ext+'.'+filename.split('.')[-1])
        # print (non_numbers)
        extension = filename.split('.')[-1]

        num_frames = len(list(f for f in listdir(directory) if f.startswith(non_numbers)))

        for x in range(count_numbers):
            non_numbers += '#'

        nodes_list = [node for node in nodes]
        if nodes_list:
            Anodes_list.sort(key=lambda k: k.location.x)
            xloc = nodes_list[0].location.x - 220  # place new nodes at far left
            yloc = 0
            for node in nodes:
                node.select = False
                yloc += node_mid_pt(node, 'y')
            yloc = yloc/len(nodes)
        else:
            xloc = 0
            yloc = 0

        node = nodes.new(node_type)
        node.location.x = xloc
        node.location.y = yloc + 110
        node.label = non_numbers+'.'+extension

        img = bpy.data.images.load(directory+(without_ext+'.'+extension))
        img.source = 'SEQUENCE'
        node.image = img
        if context.space_data.node_tree.type == 'SHADER':
            node.image_user.frame_duration = num_frames
        else:
            node.frame_duration = num_frames

        return {'FINISHED'}


class NWAddMultipleImages(Operator, ImportHelper):
    """Add multiple images at once"""
    bl_idname = 'node.nw_add_multiple_images'
    bl_label = 'Open Selected Images'
    bl_options = {'REGISTER', 'UNDO'}
    directory = StringProperty(subtype="DIR_PATH")
    files = CollectionProperty(type=bpy.types.OperatorFileListElement, options={'HIDDEN', 'SKIP_SAVE'})

    @classmethod
    def poll(cls, context):
        snode = context.space_data
        return (snode.type == 'NODE_EDITOR' and snode.node_tree is not None)

    def execute(self, context):
        nodes, links = get_nodes_links(context)
        nodes_list = [node for node in nodes]
        if nodes_list:
            nodes_list.sort(key=lambda k: k.location.x)
            xloc = nodes_list[0].location.x - 220  # place new nodes at far left
            yloc = 0
            for node in nodes:
                node.select = False
                yloc += node_mid_pt(node, 'y')
            yloc = yloc/len(nodes)
        else:
            xloc = 0
            yloc = 0

        if context.space_data.node_tree.type == 'SHADER':
            node_type = "ShaderNodeTexImage"
        elif context.space_data.node_tree.type == 'COMPOSITING':
            node_type = "CompositorNodeImage"
        else:
            self.report({'ERROR'}, "Unsupported Node Tree type!")
            return {'CANCELLED'}

        new_nodes = []
        for f in self.files:
            fname = f.name

            node = nodes.new(node_type)
            new_nodes.append(node)
            node.label = fname
            node.hide = True
            node.width_hidden = 100
            node.location.x = xloc
            node.location.y = yloc
            yloc -= 40

            img = bpy.data.images.load(self.directory+fname)
            node.image = img

        # shift new nodes up to center of tree
        list_size = new_nodes[0].location.y - new_nodes[-1].location.y
        for node in new_nodes:
            node.select = True
            node.location.y += (list_size/2)
        return {'FINISHED'}


#
#  P A N E L
#

def drawlayout(context, layout, mode='non-panel'):
    tree_type = context.space_data.tree_type

    col = layout.column(align=True)
    col.menu(NWMergeNodesMenu.bl_idname)
    col.separator()

    col = layout.column(align=True)
    col.menu(NWSwitchNodeTypeMenu.bl_idname, text="Switch Node Type")
    col.separator()

    if tree_type == 'ShaderNodeTree':
        col = layout.column(align=True)
        col.operator(NWAddTextureSetup.bl_idname, text="Add Texture Setup", icon='NODE_SEL')
        col.separator()

    col = layout.column(align=True)
    col.operator(NWDetachOutputs.bl_idname, icon='UNLINKED')
    col.operator(NWSwapLinks.bl_idname)
    col.menu(NWAddReroutesMenu.bl_idname, text="Add Reroutes", icon='LAYER_USED')
    col.separator()

    col = layout.column(align=True)
    col.menu(NWLinkActiveToSelectedMenu.bl_idname, text="Link Active To Selected", icon='LINKED')
    col.operator(NWLinkToOutputNode.bl_idname, icon='DRIVER')
    col.separator()

    col = layout.column(align=True)
    if mode == 'panel':
        row = col.row(align=True)
        row.operator(NWClearLabel.bl_idname).option = True
        row.operator(NWModifyLabels.bl_idname)
    else:
        col.operator(NWClearLabel.bl_idname).option = True
        col.operator(NWModifyLabels.bl_idname)
    col.menu(NWBatchChangeNodesMenu.bl_idname, text="Batch Change")
    col.separator()
    col.menu(NWCopyToSelectedMenu.bl_idname, text="Copy to Selected")
    col.separator()

    col = layout.column(align=True)
    if tree_type == 'CompositorNodeTree':
        col.operator(NWResetBG.bl_idname, icon='ZOOM_PREVIOUS')
    col.operator(NWReloadImages.bl_idname, icon='FILE_REFRESH')
    col.separator()

    col = layout.column(align=True)
    col.operator(NWFrameSelected.bl_idname, icon='STICKY_UVS_LOC')
    col.separator()

    col = layout.column(align=True)
    col.operator(NWDeleteUnused.bl_idname, icon='CANCEL')
    col.separator()


class NodeWranglerPanel(Panel, NWBase):
    bl_idname = "NODE_PT_nw_node_wrangler"
    bl_space_type = 'NODE_EDITOR'
    bl_region_type = 'UI'
    bl_label = "Node Wrangler"

    prepend = StringProperty(
        name='prepend',
    )
    append = StringProperty()
    remove = StringProperty()

    def draw(self, context):
        self.layout.label(text="(Quick access: Ctrl+Space)")
        drawlayout(context, self.layout, mode='panel')


#
#  M E N U S
#
class NodeWranglerMenu(Menu, NWBase):
    bl_idname = "NODE_MT_nw_node_wrangler_menu"
    bl_label = "Node Wrangler"

    def draw(self, context):
        drawlayout(context, self.layout)


class NWMergeNodesMenu(Menu, NWBase):
    bl_idname = "NODE_MT_nw_merge_nodes_menu"
    bl_label = "Merge Selected Nodes"

    def draw(self, context):
        type = context.space_data.tree_type
        layout = self.layout
        if type == 'ShaderNodeTree':
            layout.menu(NWMergeShadersMenu.bl_idname, text="Use Shaders")
        layout.menu(NWMergeMixMenu.bl_idname, text="Use Mix Nodes")
        layout.menu(NWMergeMathMenu.bl_idname, text="Use Math Nodes")


class NWMergeShadersMenu(Menu, NWBase):
    bl_idname = "NODE_MT_nw_merge_shaders_menu"
    bl_label = "Merge Selected Nodes using Shaders"

    def draw(self, context):
        layout = self.layout
        for type in ('MIX', 'ADD'):
            props = layout.operator(NWMergeNodes.bl_idname, text=type)
            props.mode = type
            props.merge_type = 'SHADER'


class NWMergeMixMenu(Menu, NWBase):
    bl_idname = "NODE_MT_nw_merge_mix_menu"
    bl_label = "Merge Selected Nodes using Mix"

    def draw(self, context):
        layout = self.layout
        for type, name, description in blend_types:
            props = layout.operator(NWMergeNodes.bl_idname, text=name)
            props.mode = type
            props.merge_type = 'MIX'


class NWConnectionListOutputs(Menu, NWBase):
    bl_idname = "NODE_MT_nw_connection_list_out"
    bl_label = "From:"

    def draw(self, context):
        layout = self.layout
        nodes, links = get_nodes_links(context)

        n1 = nodes[context.scene.NWLazySource]

        if n1.type == "R_LAYERS":
            index=0
            for o in n1.outputs:
                if o.enabled:  # Check which passes the render layer has enabled
                    layout.operator(NWCallInputsMenu.bl_idname, text=o.name, icon="RADIOBUT_OFF").from_socket=index
                index+=1
        else:
            index=0
            for o in n1.outputs:
                layout.operator(NWCallInputsMenu.bl_idname, text=o.name, icon="RADIOBUT_OFF").from_socket=index
                index+=1


class NWConnectionListInputs(Menu, NWBase):
    bl_idname = "NODE_MT_nw_connection_list_in"
    bl_label = "To:"

    def draw(self, context):
        layout = self.layout
        nodes, links = get_nodes_links(context)

        n2 = nodes[context.scene.NWLazyTarget]

        #print (self.from_socket)

        index = 0
        for i in n2.inputs:
            op = layout.operator(NWMakeLink.bl_idname, text=i.name, icon="FORWARD")
            op.from_socket = context.scene.NWSourceSocket
            op.to_socket = index
            index+=1


class NWMergeMathMenu(Menu, NWBase):
    bl_idname = "NODE_MT_nw_merge_math_menu"
    bl_label = "Merge Selected Nodes using Math"

    def draw(self, context):
        layout = self.layout
        for type, name, description in operations:
            props = layout.operator(NWMergeNodes.bl_idname, text=name)
            props.mode = type
            props.merge_type = 'MATH'


class NWBatchChangeNodesMenu(Menu, NWBase):
    bl_idname = "NODE_MT_nw_batch_change_nodes_menu"