MonoidMusician

MonoidMusicianʼs Type Theory Musings

Welcome to my (un)scrambled thoughts on all things from the intersection of homotopy type theory, functional programming, and set theory! Thereʼs going to be a lot of terminology being thrown around, but donʼt be intimidated: hopefully Iʼll either describe the term, link to a definition/explanation, or youʼll be able to figure it out from context (or just skip it!). I do believe the best way to be clear is to be precise with language and to use established terminology, but because I am synthesizing pretty disparate areas of knowledge, most people wonʼt know all the terms.

My goal with these are to raise some new perspectives on common themes, and cross-pollinate these fields with each other.

matthewbauer

# Usage: $ nix eval "(builtins.attrNames (import (builtins.fetchurl "https://matthewbauer.us/generate-versions.nix") {}).emacs)"
#        $ nix run "(import (builtins.fetchurl "https://matthewbauer.us/generate-versions.nix") {}).emacs.\"24.3\"" -u LANG -c emacs
{ channels ? [ "19.03" "18.09" "18.03" "17.09" "17.03"
               "16.09" "16.03" "15.09" "14.12" "14.04" "13.10" ]
, attrs ? builtins.attrNames (import <nixpkgs> {})
, system ? builtins.currentSystem
, args ? { inherit system; }
}: let

  getSet = channel: (import (builtins.fetchTarball "channel:nixos-${channel}") args).pkgs;

rbreaves

# permanent apple keyboard keyswap
echo "options hid_apple swap_opt_cmd=1" | sudo tee -a /etc/modprobe.d/hid_apple.conf
update-initramfs -u -k all

# Temporary & instant apple keyboard keyswap
echo '1' | sudo tee -a /sys/module/hid_apple/parameters/swap_opt_cmd

# Windows and Mac keyboards - GUI (Physical Alt is Ctrl, Physical Super is Alt, Physical Ctrl is Super)
setxkbmap -option;setxkbmap -option altwin:ctrl_alt_win

colomboe

// Porting of https://gist.github.com/jdegoes/dd66656382247dc5b7228fb0f2cb97c8

typealias UserID = String
data class UserProfile(val name: String)

// The database module:
interface DatabaseService {
    suspend fun dbLookup(id: UserID): UserProfile
    suspend fun dbUpdate(id: UserID, profile: UserProfile)
}

Widdershin

self: super:

{
  # Install overlay:
  # $ mkdir -p ~/.config/nixpkgs/overlays
  # $ curl https://gist.githubusercontent.com/LnL7/570349866bb69467d0caf5cb175faa74/raw/3f3d53fe8e8713ee321ee894ecf76edbcb0b3711/lnl-overlay.nix -o ~/.config/nixpkgs/overlays/lnl.nix
  userPackages              = super.userPackages or {} // {
    self.config.allowUnfree = true;
    self.config.allowUnsupportedSystem = true;

jakedohm

// Server API makes it possible to hook into various parts of Gridsome
// on server-side and add custom data to the GraphQL data layer.
// Learn more: https://gridsome.org/docs/server-api

// Changes here requires a server restart.
// To restart press CTRL + C in terminal and run `gridsome develop`

const { setContext } = require('apollo-link-context')
const { HttpLink } = require('apollo-link-http')
const {

elizarov

/*
 * Implementation of backward-mode automatic differentiation.
 */

/**
 * Differentiable variable with value and derivative of differentiation ([grad]) result
 * with respect to this variable.
 */
data class D(var x: Double, var d: Double = 0.0) {
    constructor(x: Int): this(x.toDouble())

dubiouscript

#!/bin/bash
# 
# Copyright 2016-2017 Martin Goellnitz
#
# update gitlab api
# https://gist.github.com/dubiouscript/5553dce89497ffd9805dd0de16503e8d
# -dscript-
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by

elizarov

import kotlin.coroutines.*
import kotlin.coroutines.intrinsics.*

/**
 * Implementation for Delimited Continuations `shift`/`reset` primitives via Kotlin Coroutines.
 * See [https://en.wikipedia.org/wiki/Delimited_continuation].
 *
 * The following LISP code:
 *
 * ```

gelisam

-- a continuation of https://gist.github.com/gelisam/137effb33d2777328d366dcb563d8d13
{-# LANGUAGE FlexibleContexts, FlexibleInstances, GeneralizedNewtypeDeriving, LambdaCase, MultiParamTypeClasses #-}
module EIO where

import Control.Monad
import Data.Void
import Test.DocTest
import qualified Control.Exception as E