apainintheneck

/*
 Shell-lib
----------
 Mimic familiar shell commands inside of C++.
--------------------------------------------
 MIT License

 Copyright (c) 2022 Kevin Robell

 Permission is hereby granted, free of charge, to any person obtaining a copy

apainintheneck

//A trie used to find the positions of words in a text file.

#include <vector>
#include <string>
#include <cctype>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <memory>

apainintheneck

export function* permutations(array) {
    let mutArray = array.slice();
    if(mutArray.length > 0) yield mutArray.slice();
    const stack = Array(mutArray.length).fill(0);
    
    for(let i = 0; i < mutArray.length;) {
        if(stack[i] < i) {
            if(i % 2 === 0) {
                [mutArray[0], mutArray[i]] = [mutArray[i], mutArray[0]];
            } else {

apainintheneck

Bit Manipulation Tips & Tricks

We all know that bit masking is occasionally necessary if you're dealing with data at the binary level but, if you're anything like me, you use it infrequently enough that you constantly have to lookup anything beyond the basics. This is just a spot to record all of the little tricks that I've come across in one place.

Basics

The three most common operations are to get, set and clear single bits. Those are usually pretty easy to remember but for thoroughness I'll note them down here.

# Get a bit
mask = (1<<bit)
num &amp; mask

apainintheneck

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>

#include <sys/stat.h>
#include <glob.h>
#include <ctime>

apainintheneck

#pragma once

#include <fstream>
#include <string>
#include <vector>
#include <cctype>

/*
 csv_cpp is complaint with the RFC 4180 (https://datatracker.ietf.org/doc/html/rfc4180)
 with a few exceptions.

apainintheneck

#include <array>
#include <cctype>
#include <fstream>
#include <iostream>
#include <string>

/*
 Usage: agram [base word] [min length]
 
 Find partial anagrams using the /usr/share/dict/words list on mac.

apainintheneck

#!/usr/bin/env awk -f
# A program that produces a table of contents from a markdown file.
# It assumes that the start title depth is 2 (## or h2) but that can
# be modified by passing in the START variable.
#
# Ex. cat readme.md | ./tocgen.awk
# Ex. cat readme.md | ./tocgen.awk -v START=1

BEGIN {
  if(!START) START = 2

apainintheneck

#!/usr/bin/env awk -f
# A program that packs yaml into strings representing the location
# of elements that makes yaml more greppable. Inspired by Gron
# which does something similar with JSON (https://github.com/tomnomnom/gron).

# This currently only supports a subset of YAML.
# - Simple keys
#   - (alphanumeric + dash + underscore) + (optional spaces) + colon
#   - [A-Za-z_-]+[ ]*:
#   - Colon must be followed by a space

apainintheneck

#!/usr/bin/env awk -f
# An interactive way to trim unused or unwanted git branches in the current directory.
# 
# 1. Go through the branches from oldest to newest.
# 2. Autoremove already merged-in branches.
# 3. Wait for user command on other branches.
# 
# User commands:
#   h: Help page
#   l: Commit log