cloning
link-mesh-array.py
link-mesh.py

mesh fabrication
staircase.py
triangle-donut.py
vertexAccumulator.py
randomSquareArray.py
meshFromBathymetry.py
cylinders-from-list-of-radii.py
binary-image-to-mesh.py
sphere-minecraft-schematic.py
spikify.py
add-to-mesh.py
mobius-strip.py
split-copy-mesh.py

fabricating other objects
create-text.py
text-from-file.py
create-camera.py
create-bezier.py
helix-bezier.py

material slots
cube-copy-blue.py
cube-turns-red.py
red-blue-per-object.py

animation and fcurves
csv-to-fcurve-loc-rot.py
csv-to-fcurve.py
pop-in-material.py
spike-wiggle-2.py
spike-wiggle.py
sweep-animate-size.py
animate-cycles-lamp-strength.py

incorporating python libraries
exec-text-library.py
exec-external-python.py
import-python.py

constraints
camera-track-object.py
text-track-camera.py

shape keys
explore-shape-keys.py
shape-key-fin.py
docking-tube.py

animating curve bevel
data-graph.py

drivers
scan-drivers.py
copy-drivers.py
driver-fin.py
driver-multi-chain.py

UV layers
barber-pole.py
expand-uv-to-fit.py
uv-from-geometry-cubic.py
flip-texture-v-coordinate.py

modifiers
hook-modifier-curve.py
rounded-prisms.py
make-tile.py
remove-action-modifiers.py

NLAs
explore-NLAs.py
spinning-frogs.py

video sequence editor (VSE)
create-vse-image-strips.py
slide-show.py
vse-strip-gap.py

images and textures
image-on-mesh.py
image-to-material-node.py
load-image-texture.py
texture-one-cube-face.py
condense-duplicate-images.py

analytic geometry
animate-random-spin.py
camera-cone-exp-2.py
camera-cone-exp.py
compute-circle-center.py
dihedral-angle-from-xy.py
extrude-edge-along-custom-axis.py
orientation-matrix.py
two-spheres.py
bezier-interpolate.py
rotate-to-match.py

node trees
change-diffuse-to-emission-node.py

etc
add-plane-from-selected-vertices.py
adjust-all-materials.py
all-nodes-cycles-materials.py
bit_shift.py
bone-orientation-demo.py
cannonball-packing.py
comb.py
convert-quaternion-keyframes-to-euler.py
copy-location-from-vertex-group.py
create-cycles-material.py
demonstrate-decomposition-instability.py
dump-point-cache.py
dump-screen-layout-info.py
expand-nla-strips.py
explore-edge-bevel-weight.py
find-action-users.py
find-green-rectangle.py
find-new-objects.py
fix-scene-layers.py
generate-makefile.py
link-external-data-blocks.py
list-referenced-files.py
material-readout.py
movie-card-stack.py
movies-on-faces.py
next-file-name.py
object-font-from-regular-font.py
operator-mesh-gridify.py
particle-animator.py
particle_loop.py
pose-match.py
pose-sequence-to-fbx.py
prepare-texture-bake.py
raining-physics.py
random-pebble-material.py
reverse-keyframes.py
scale-parallelogram.py
screenshot-sequence.py
select-objects-in-modifiers.py
select-vertices.py
shift-layers.py
snapshot-keyframes-as-mesh.py
sphere-project-texture.py
squish-mesh-axis.py
subdivide-fcurve.py
thicken-texture.py
transform-selected.py
voronoi-madness.py

__author__ = 'thoth'

import bpy
import os

def debug_print(msg):
    print(msg)

def list_referenced_images():
    rval = set()
    for img in bpy.data.images:
        if img.filepath is not None:
            debug_print ("IMAGE %s"%img.filepath)
            rval.add(bpy.path.abspath(img.filepath))
    return rval

def paths_for_vse_strip(strip):
    if hasattr(strip, "filepath"):
        return [ strip.filepath ]
    if hasattr(strip, "directory"):
        return [ strip.directory+elt.filename for elt in strip.elements ]
    return []

def list_vse_references():
    rval = set()
    for scn in bpy.data.scenes:
        if scn.sequence_editor is not None:
            for strip in scn.sequence_editor.sequences_all:
                for path in paths_for_vse_strip(strip):
                    debug_print("VSE %s"%path)
                    rval.add(bpy.path.abspath(path))
    return rval


def file_is_used(f, used):
    if f in used:
        return True

    # OMG, windows.  WTF?
    for f2 in used:
        if os.path.samefile(f2, f):
            return True

    return False


def mission1():
    used  = set()
    used.update( list_referenced_images() )
    used.update( list_vse_references() )

    dir = "/var/tmp/blender"
    for f in sorted(os.listdir(dir)):
        f2 = os.path.join(dir, f)
        if file_is_used(f2, used):
            print("USED\t%s"%f2)
        else:
            print("UNUSED\t%s"%f2)


mission1()

Blender python API quick-start

Syntax highlighting by Pygments.