import holoviews as hv
from holoviews import opts
from holoviews.operation import contours
hv.extension('matplotlib')

penguins = hv.RGB.load_image('../assets/penguins.png')
hv.save(penguins, 'penguin_plot.png', fmt='png')
penguins

hv.archive.auto()

penguins[:,:,'R'].relabel("Red") + penguins[:,:,'G'].relabel("Green") + penguins[:,:,'B'].relabel("Blue")

penguins * hv.Arrow(0.15, 0.3, 'Penguin', '>')

cs = contours(penguins[:,:,'R'], levels=[0.10,0.80])
overlay = penguins[:, :, 'R'] * cs
overlay.opts(
    opts.Contours(linewidth=1.3, cmap='Autumn'),
    opts.Image(cmap="gray"))

hv.archive.contents()

hv.archive.filename_formatter="{SHA:.8}"
cs

hv.archive.contents()

import json
hv.archive.add(filename='metadata.json', 
               data=json.dumps({'repository':'git@github.com:ioam/holoviews.git',
                                'commit':'437e8d69'}), info={'mime_type':'text/json'})

hv.archive.contents()

listing = hv.archive.listing()
listing

hv.archive.export()

import os
os.getcwd()
if os.path.exists(hv.archive.notebook_name):
    print('\n'.join(sorted(os.listdir(hv.archive.notebook_name))))

hv.archive.last_export_status()

import os
from holoviews.core.io import Unpickler
c, a = None,None
hvz_file = [f for f in listing if f.endswith('hvz')][0]
path = os.path.join(hv.archive.notebook_name, hvz_file)

if os.path.isfile(path):
    print('Unpickling {filename}'.format(filename=hvz_file))
    obj = Unpickler.load(open(path,"rb"))
    print(obj)
else:
    print('Could not find file {path}'.format(path=path))
    print('Current directory is {cwd}'.format(cwd=os.getcwd()))
    print('Containing files and directories: {listing}'.format(listing=os.listdir(os.getcwd())))