lonetwin

#!/usr/bin/python
# zodb_undo.py - Snippet to undo zodb transactions upto a specific point in the past

zodb_file = "var/karl.db"
undo_back_to = (2011, 6, 15, 11, 00, 00, 00, 00, 00) # time tuple

import time
import transaction
from ZODB import FileStorage, DB

lonetwin

# I needed to print out ascii tables from data in the form:
# [ ('column 0 title', 'column 1 title'  ..),
#   ('row 0, column 0 data', 'row 0, column 1 data' ...) ...]
#
# and surprisingly it got complicated because of variable lengths of the data.
# I googled for 'standard' ways of doing this and I found suggestions like:
# http://stackoverflow.com/questions/5909873/python-pretty-printing-ascii-tables
# ...which were a bit dated and hard to read or full scale modules like:
#
# http://pypi.python.org/pypi/texttable/

lonetwin

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# The MIT License (MIT)
#
# Copyright (c) 2015 Steven Fernandez
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

lonetwin

#!/usr/bin/env python
notes       = ['a', 'a#', 'b', 'c', 'c#', 'd', 'd#', 'e', 'f', 'f#', 'g', 'g#'] * 2

chroma      = lambda x: [ i for i in notes[ notes.index(x): ] + notes[ :notes.index(x) ] ] + [x]
major       = lambda x: ( chroma(x)[:5] + [chroma(x)[5]] + chroma(x)[5:12] )[::2] + [x]
major_penta = lambda x: [ i for idx, i in enumerate(major(x)) if idx not in (3, 6) ]
minor_penta = lambda x: ( major_penta( notes[ notes.index(x) + 3 ])[:-1] * 2)[-6:]

"""
# for example

lonetwin

function ShowGitHubURL()
    " Function to echo the github URL for the currently open file at the
    " current line number. This is useful if for example, you want to quickly
    " share the URL for the file you're working on via, email / IRC etc.
    "
    " This can also be easily extended to open the browser with the displayed
    " URL using tips such as http://vim.wikia.com/wiki/VimTip306
    "
    " You may add a mapping like this to bind this function to a keystroke:
    " map <Leader>gh :call ShowGitHubURL()<CR>

lonetwin

I like to manage dotfiles without having to mess with silly symlinks or having
to install/configure specific dotfile managament tools. So here's what I did:
 
$ cd ~
$ git init .
$ echo '*' > .gitignore                   # ignore all files by default
$ echo '!.bashrc' >> .gitignore           # ...and then tell git what files not to *not* ignore
$         # ...add other files you may want to track to *not* ignore
$ git add .bashrc                         # now actually add the files to git
$ git add .gitignore                      # add the .gitignore to git

lonetwin

#!/usr/bin/env python
# A more detailed explaination will come as a blog post soon, but in brief,
# here is the problem that led to this:
#
# For various reasons we have a requirement to implement an 'sftp' like
# abstraction/interface for a service that we provide. Basically we need to
# present objects in our application as a filesystem accessible over sftp.
#
# The way we have decided to go about this is to replace the 'standard' openssh
# sftp subsystem command entry in /etc/ssh/sshd_config on our servers with our

lonetwin

#!/usr/bin/env python
# -*- coding: utf-8 -*-
def page_category_filter(bid_request, config):
    if config["mode"] == "whitelist":
        return bool(
            bid_request["categories"] & set(config["categories"])
        )
    else:
        return bool(
            config["categories"] and not

lonetwin

import logging
import fcntl
from contextlib import contextmanager

@contextmanager
def locked_open(filename, mode='r'):
    """locked_open(filename, mode='r') -> <open file object>
    
       Context manager that on entry opens the path `filename`, using `mode`
       (default: `r`), and applies an advisory write lock on the file which

lonetwin

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Minimal example of writing logs to a dlt-daemon from a python app. The
# message will look like this when printed out using
# "dlt-receive -a localhost":
# 2016/03/10 10:24:42.772153  290716359 016 ECU1 DLTD INTM log info V 1 [ApplicationID 'APPY' registered for PID 29, Description=APPY service]
# 2016/03/10 10:24:42.772178  290716360 017 ECU1 DLTD INTM log info V 1 [ContextID 'APPY' registered for ApplicationID 'APPY', Description=Context for APPY]
# 2016/03/10 10:24:42.772182  290716359 000 ECU1 APPY APPY log info V 1 [This is a log message]
# 2016/03/10 10:24:42.772185  290716360 018 ECU1 DLTD INTM log info V 1 [Unregistered ContextID 'APPY' for ApplicationID 'APPY']
# 2016/03/10 10:24:42.772190  290716360 019 ECU1 DLTD INTM log info V 1 [Unregistered ApplicationID 'APPY']