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bl_info = {
    "name": "Add Chain",
    "author": "Brian Hinton (Nichod)",
    "version": (0,1),
    "blender": (2, 5, 7),
    "api": 35622,
    "location": "View3D > Add > Mesh",
    "description": "Adds Chain with curve guide for easy creation",
    "warning": "",
    "wiki_url": "http://wiki.blender.org/index.php/Extensions:2.5/Py/"\
        "Scripts/Object/Add_Chain",
    "tracker_url": "https://projects.blender.org/tracker/index.php?"\
        "func=detail&aid=22203",
    "category": "Object"}

import bpy

def Add_Chain():
  

    ##Adds Empty to scene
    bpy.ops.object.add(
        type='EMPTY', view_align=False, enter_editmode=False, location=(0, 0, 0), 
        rotation=(0, 0, 0),
        layers=(True, False, False, False, False, False, False, False, False,
                False, False, False, False, False, False, False, False, False, 
                False, False))

    ##Changes name of Empty to rot_link adds variable emp
    emp = bpy.context.object
    emp.name = "rot_link"

    ##Rotate emp ~ 90 degrees
    emp.rotation_euler = [1.570796, 0, 0]

    ##Adds Curve Path to scene
    bpy.ops.curve.primitive_nurbs_path_add(
        view_align=False, enter_editmode=False, location=(0, 0, 0), 
        rotation=(0, 0, 0), 
        layers=(True, False, False, False, False, False, False, False, False, 
        False, False, False, False, False, False, False, False, False, False, 
        False))

    ##Change Curve name to deform adds variable curv
    curv = bpy.context.object
    curv.name = "deform"

    ##Inserts Torus primitive
    bpy.ops.mesh.primitive_torus_add(
        major_radius=1, minor_radius=0.25, major_segments=12, minor_segments=4, 
        use_abso=False, abso_major_rad=1, abso_minor_rad=0.5)

    ##Positions Torus primitive to center of scene
    bpy.context.active_object.location = [0, 0, 0]

    ##Changes Torus name to chain adds variable tor
    tor = bpy.context.object
    tor.name = "chain"

    ##Adds Array Modifier to tor
    bpy.ops.object.modifier_add(type='ARRAY')

    ##Adds subsurf modifier tor
    bpy.ops.object.modifier_add(type='SUBSURF')

    ##Smooths tor
    bpy.ops.object.shade_smooth()

    ##Select curv 
    sce = bpy.context.scene
    sce.objects.active = curv

    ##Toggle into editmode
    bpy.ops.object.editmode_toggle()

    ##Translate curve object
    bpy.ops.transform.translate(
        value=(2, 0, 0), constraint_axis=(True, False, False), 
        constraint_orientation='GLOBAL', mirror=False, proportional='DISABLED', 
        proportional_edit_falloff='SMOOTH', proportional_size=1, snap=False, 
        snap_target='CLOSEST', snap_point=(0, 0, 0), snap_align=False,
        snap_normal=(0, 0, 0), release_confirm=False)

    ##Toggle into objectmode
    bpy.ops.object.editmode_toggle()

    ##Select tor or chain
    sce.objects.active = tor

    ##Selects Array Modifier for editing
    array = tor.modifiers['Array']

    ##Change Array Modifier Parameters
    array.fit_type = ('FIT_CURVE')
    array.curve = curv
    array.offset_object = emp
    array.use_object_offset = True
    array.relative_offset_displace = [ 0.549, 0, 0 ]

    ##Add curve modifier
    bpy.ops.object.modifier_add(type='CURVE')

    ##Selects Curve Modifier for editing
    cur = tor.modifiers['Curve']

    ##Change Curve Modifier Parameters
    cur.object = curv

#makes AddChain an operator
class AddChain(bpy.types.Operator):
    '''Add a Chain.'''
    bl_idname = "mesh.primitive_chain_add"
    bl_label = "Add Chain"
    bl_options = {'REGISTER', 'UNDO'}


    def execute(self, context):
        Add_Chain()

        return {'FINISHED'}

# Register the operator
def menu_func(self, context):
    self.layout.operator(AddChain.bl_idname, text="Chain", icon='PLUGIN')


def register():
    bpy.utils.register_module(__name__)

    # Add "Chain" menu to the "Add Mesh" menu.
    bpy.types.INFO_MT_mesh_add.append(menu_func)


def unregister():
    bpy.utils.unregister_module(__name__)

    # Remove "Chain" menu from the "Add Mesh" menu.
    bpy.types.INFO_MT_mesh_add.remove(menu_func)

if __name__ == "__main__":
    register()