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def _find_ext_nodes(extension, ignore_classes=None):
    # type: (str, Optional[List[str]]) -> Dict[str, nuke.Node]
    """Find nodes which are not part of default Nuke
    """

    if ignore_classes is None:
        ignore_classes = []

    by_class = {} # type: Dict[str, nuke.Node]
    for n in nuke.allNodes(recurseGroups=True):

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diff --git a/pytoshop/layers.py b/pytoshop/layers.py
index d4bef85..a6577c4 100755
--- a/pytoshop/layers.py
+++ b/pytoshop/layers.py
@@ -642,10 +642,14 @@ class LayerRecord(object):
                  visible=True,                       # type: bool
                  pixel_data_irrelevant=False,        # type: bool
                  name='',                            # type: unicode
-                 channels={},  # type: Dict[int, ChannelImageData]
-                 blocks=[],    # type: List[tagged_block.TaggedBlock]

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def viewer_shotcuts_alt():
    # Alt+1, Alt+2 etc to connect node to viewer
    for n in range(9):
        def connect_viewer(n=n):
            selection = nuke.selectedNodes()
            nuke.connectViewer(n, nuke.selectedNode())
            [node.setSelected(False) for node in nuke.selectedNodes()]
            [node.setSelected(True) for node in selection]

        nuke.menu("Node Graph").addMenu("ViewerThing").addCommand(

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set cut_paste_input [stack 0]
version 8.0 v6
push $cut_paste_input
Keyer {
 operation "luminance key"
 range {0.09247749808 1 1 1}
 name Keyer1
 selected true
 xpos -398
 ypos -86

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"""
RGB to XYZ gamut-remapping matrix calculation.

Main function is rgb_to_xyz_matrix.
"""

class MatrixError(Exception):
    pass

class NonInvertableMatrix(MatrixError):

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def root_settings_to_string(root):
    """Serialise the project settings. Used when writing the selected
    nodes (otherwise things like the frame range would be lost)
    """

    # Write non-default settings, in .nk script format. Also write
    # user-knob definitons to avoid errors like NUKE-256
    rootstring = root.writeKnobs(nuke.TO_SCRIPT | nuke.WRITE_USER_KNOB_DEFS)

    # TODO: Why doesn't writeKnobs write [first/last]_frame? Also

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INFO:__main__:Found challenge 1, http://app.strava.com/challenges/1 (Rapha Festive 500)
INFO:__main__:Found challenge 2, http://app.strava.com/challenges/2 (Strava Ride Base Mile Blast)
INFO:__main__:Found challenge 3, http://app.strava.com/challenges/3 (Strava Run Base Mile Blast)
DEBUG:__main__:Challenge 4 does not exist
INFO:__main__:Found challenge 5, http://app.strava.com/challenges/5 (A Classic Challenge from Specialized)
DEBUG:__main__:Challenge 6 does not exist
DEBUG:__main__:Challenge 7 does not exist
DEBUG:__main__:Challenge 8 does not exist
DEBUG:__main__:Challenge 9 does not exist
INFO:__main__:Found challenge 10, http://app.strava.com/challenges/10 (GU 100,000 Mile Challenge)

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set cut_paste_input [stack 0]
version 7.0 v5
push $cut_paste_input
UvLensDistort8 {
 inputs 0
 name UvLensDistort8_1
 label "Shot: \[lindex \[split \[value file] \"/\"] 4]\nElem: \[lindex \[split \[value file] \"/\"] 6]\n(\[lindex \[split \[value file] \"/\"] 7] analysis \[lindex \[split \[value file] \"/\"] 9])"
 selected true
 xpos -166
 ypos -26

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function process(canvas, func) {
    function setPixel(imageData, x, y, rgba) {
        var index = (x + y * imageData.width) * 4;

        for (var i = 0; i < 4; i++) {
            imageData.data[index + i] = rgba[i] * 255;
        }
    }

    var ctx = canvas.getContext("2d");