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---
 app/controllers/attachments_controller.rb     |  4 +-
 app/controllers/wiki_controller.rb            | 41 +++++++++++++------
 app/helpers/application_helper.rb             | 16 +++-----
 app/helpers/wiki_helper.rb                    | 14 +++++--
 app/models/wiki.rb                            | 21 ++++++++--
 app/models/wiki_content.rb                    |  6 ++-
 app/models/wiki_page.rb                       | 14 +++++--
 app/views/wiki/_new_modal.html.erb            |  2 +-
 app/views/wiki/annotate.html.erb              |  4 +-

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# https://www.vertexfragment.com/ramblings/cantor-szudzik-pairing-functions/
# https://stackoverflow.com/questions/38965931/hash-function-for-3-integers
# https://math.stackexchange.com/questions/222709/inverting-the-cantor-pairing-function

def normalize(x):
    # this function make cantor pairing function work for negative numbers
    return 2*x if (x>=0) else (-2*x-1)

def normalize_inv(x):
    return x//2 if (x % 2 == 0) else -(x+1)//2

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set (CMAKE_CXX_STANDARD 14)
cmake_minimum_required(VERSION 2.6 FATAL_ERROR)
project(MY_GRAND_PROJECT)
# specify the components required
#find_package(PCL 1.10 REQUIRED COMPONENTS common io)
# or use all available components
find_package(PCL 1.12 PATHS "$ENV{HOME}/Documents/pcl/build")
#find_package(PCL 1.10 REQUIRED)
include_directories("/usr/include/eigen3")
include_directories("$ENV{HOME}/Documents/pcl")

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diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 4a88079..e7496fb 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -158,8 +158,10 @@ class AttachmentsController < ApplicationController
       @attachment.destroy
     end
 
+    container = @attachment.try(:container) || @container
     respond_to do |format|

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import zlib
import zipfile
from tqdm import tqdm

#https://stackoverflow.com/questions/47438424/python-zip-compress-multiple-files
def compress(path, file_names):
    print("Containing directory:")
    print(path)
    print("File Paths:")
    print(file_names)

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import json

nb_fname = "xxx.ipynb"
with open(nb_fname, "r", encoding="utf-8") as f:
    nb = json.load(f)
cells = nb['cells']
print("There are", len(cells), "cells")

for cell in cells:
    source = ''.join(cell['source'])

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# -*- coding: utf-8 -*-

import requests
from bs4 import BeautifulSoup
import wget #for downloading files
# convert url to normal string
from urllib.parse import unquote
import os

url_base = "https://sourceforge.net/"