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Christopher Smith cbsmith

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cbsmith / random_selection.cpp
Last active August 9, 2022 12:29
Hopefully serves as a reference implementation on how to do random selection of an element from a container.
// -*- compile-command: "clang++ -ggdb -o random_selection -std=c++0x -stdlib=libc++ random_selection.cpp" -*-
//Reference implementation for doing random number selection from a container.
//Kept for posterity and because I made a surprising number of subtle mistakes on my first attempt.
#include <random>
#include <iterator>
template <typename RandomGenerator = std::default_random_engine>
struct random_selector
{
//On most platforms, you probably want to use std::random_device("/dev/urandom")()
@cbsmith
cbsmith / protoc-gen-depends.py
Created April 16, 2012 05:15
Makefile dependency generator plugin for protoc.
#!/usr/bin/python
# Save this file as protoc-gen-depends, put it in your path (executable) and add "--depends-out=/whatever/path" to your protoc invocation
from google.protobuf.compiler.plugin_pb2 import CodeGeneratorRequest,CodeGeneratorResponse
from sys import stdin,stdout
req = CodeGeneratorRequest()
req.MergeFromString(''.join(stdin.readlines()))
res = CodeGeneratorResponse()
@cbsmith
cbsmith / fmapp.hpp
Created September 5, 2018 02:34
A handy implementation of fmap that is apparently missing in the standard.
#ifndef FMAP_HPP__INCLUDE
#define FMAP_HPP__INCLUDE
#include <optional>
namespace nonstd {
template <typename F, typename T>
auto fmap(F f, std::optional<T> x) -> std::optional<decltype(f(std::forward<T>(*x)))> {
return (x.has_value()) ?
std::make_optional(f(std::forward<T>(*x))) :
@cbsmith
cbsmith / keybase.md
Created March 19, 2018 20:28
Proving who I am

Keybase proof

I hereby claim:

  • I am cbsmith on github.
  • I am cbsmith (https://keybase.io/cbsmith) on keybase.
  • I have a public key ASBCAABS7zQnEiWafsyLC0dowkNMrEEANe1AoVsuiwZ0BAo

To claim this, I am signing this object:

@cbsmith
cbsmith / mkpasswd.py
Created February 25, 2018 00:39
A pythonic/portable password generator for when you're in a pinch
"""
Generic xkcd style (https://xkcd.com/936/) password generator, because you never know when you're going to need a new password.
Usage:
mkpassword.py <num_words> <dictionary_path>
"""
from random import SystemRandom
from os.path import join, isfile
import sys
@cbsmith
cbsmith / idempotent_path_add.sh
Last active October 16, 2017 12:31
An example on how to do idempotent PATH manipulation.
#!/usr/local/bin/bash
#How to manipulate the path in an intelligent fashion with bash. Note: this doesn't work with Bourne shell.
function idempotent_path_add {
DIR="$1"
PREPEND=$2
if [[ ! "$PATH" =~ (^|:)"$DIR"(:|$) ]]
then
if [ $PREPEND ]
then
@cbsmith
cbsmith / config_gen.py
Created April 4, 2017 05:47
Python to generate all possible permutations of config options
from itertools import chain, ifilter, product
# These first few functions are just to sanitize data structures to deal with huamns
# providing data in ways that are convenient for their minds.
def is_iterable(x):
return hasattr(x, '__iter__')
def as_config_values(values):
@cbsmith
cbsmith / livetail.py
Last active March 26, 2017 22:31
Live tail of a file
'''
Live tail of a file. Uses mmap to try to be efficient with memory.
Requires fsmonitor: https://github.com/shaurz/fsmonitor
...which unfortunately lacks a decent monitor for non-Windows/Linux
systems, so burns up CPU unnecessarily on those platforms. Despite its
reputation, python makes it surprisingly difficult to write clean and
correct code.
'''
@cbsmith
cbsmith / livecat.py
Last active March 26, 2017 22:12
First pass at doing a live "cat" in python
'''
Live cat of file. Uses mmap to try to be efficient with memory,
though reads a byte at a time, so it burns through CPU by hitting the
python interpreter loop N times. We could add buffering, but that
would just make the code more complex, and who wants that?
stdout gets the default buffering, so consider invoking with
-u flag/PYTHONBUFFERED environment variable if not writing to
a file.
@cbsmith
cbsmith / example.com.html
Created November 23, 2016 04:54
This is what example.com looks like from Southwest.
<!doctype html>
<html>
<head><link href="http://getconnected.southwestwifi.com/unb/unb.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="http://getconnected.southwestwifi.com/unb/jqr44-1.8.3.js"></script>
<script type="text/javascript">var r44_btime=new Date();var r44_smu_time=1479876620.446</script>
<script type="text/javascript" src="http://getconnected.southwestwifi.com/unb/unb.js"></script>
<title>Example Domain</title>