import bpy, sys, os
# args: <dir> <base_clip_file> <out.glb> <clip1,clip2,...>  (clips = @names)
argv = sys.argv[sys.argv.index("--")+1:]
DIR, BASE, OUT, CLIPS = argv[0], argv[1], argv[2], argv[3].split(",")
bpy.ops.wm.read_factory_settings(use_empty=True)
bpy.ops.import_scene.gltf(filepath=os.path.join(DIR, BASE))
arm = next(o for o in bpy.data.objects if o.type == "ARMATURE")
arm.animation_data_create()
base_actions = list(bpy.data.actions)
for a in base_actions:
    a.name = BASE.split("@")[1].replace(".glb", "")
def stash(action, name):
    action.name = name
    tr = arm.animation_data.nla_tracks.new()
    tr.name = name
    tr.strips.new(name, 1, action)
    tr.mute = True
for a in base_actions:
    stash(a, a.name)
for clip in CLIPS:
    f = os.path.join(DIR, f"Sci_Fi_Hands_mesh_Empty@{clip}.glb")
    pre_a = set(bpy.data.actions); pre_o = set(bpy.data.objects)
    bpy.ops.import_scene.gltf(filepath=f)
    for o in [o for o in bpy.data.objects if o not in pre_o]:
        bpy.data.objects.remove(o, do_unlink=True)
    for a in [a for a in bpy.data.actions if a not in pre_a]:
        stash(a, clip)
arm.animation_data.action = None
exec(open("/tmp/tex_bind.py").read()); bind()
bpy.ops.export_scene.gltf(filepath=OUT, export_format="GLB", export_animations=True)
import json
print("MERGED", OUT, os.path.getsize(OUT)//1024, "KB, clips:", [t.name for t in arm.animation_data.nla_tracks])