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@ekmett
ekmett / monads for plt-racket
Created Jun 26, 2010
Monads for PLT Racket
View monads for plt-racket
(module monad scheme
(require "curry.ss")
;; i'm too lazy to repeat this pattern for now.
(define-syntax init-public
(syntax-rules ()
((_) (begin))
((_ (m default) ms ...) (begin
(init-field (m default))
(public (internal-m m))
(define (internal-m . rest) (apply (get-field m this) rest))
@danking
danking / gist:1068185
Created Jul 6, 2011
A very simple example showing how to use Racket's lexing and parsing utilities
View gist:1068185
#lang racket
(require parser-tools/lex
(prefix-in re- parser-tools/lex-sre)
parser-tools/yacc)
(provide (all-defined-out))
(define-tokens a (NUM VAR))
(define-empty-tokens b (+ - EOF LET IN))
(define-lex-trans number
(syntax-rules ()
@pjlsergeant
pjlsergeant / gist:1803656
Created Feb 11, 2012
Game of Life in 131 characters of Perl.
View gist:1803656
#!perl
use strict;
# Accepts a grid size, and a list representing the grid. 131
# characters. RUNS UNDER STRICTURES BABY YEAH.
my$life=sub{$a=shift;map{$b=$_[$_];my$n;$n+=$_[$_]for($_-$a-1..$_-$a+1,$_-1,$_+1,$_+$a-1..$_+$a+1);$n+$b==3||$b&&$n==4||0}0..$#_};
my $result = join '', $life->( 5, qw/
@rsimoes
rsimoes / linearly-typed.pl
Created Feb 22, 2012
Long-winded linearly typed variables
View linearly-typed.pl
#!/usr/bin/env perl
use strict;
use warnings;
use Data::Dump;
use Data::Alias "alias";
use Scalar::Util qw(weaken isweak);
my $foo = ["a".."z"];
alias my @bar = @$foo;
View factor.hs
npto :: (Integral a) => a -> [a]
npto x = [2,3] ++ concat [[x*6-1,x*6+1] | x <- [1..n]]
where n = ((+1) . round . sqrt . fromIntegral $ x) `div` 6
factors :: (Integral a) => a -> [a]
factors 1 = []
factors x = least : factors (x `div` least)
where least = head $ fs ++ [x]
fs = filter ((==0) . mod x) . npto $ x
@timjb
timjb / cloud-haskell-operational-transformation.hs
Created Oct 14, 2012
Simulation of Operational Transformation with Cloud Haskell
View cloud-haskell-operational-transformation.hs
{-
This is a simple simulation of OT with Cloud in which all slaves generate
and apply random operations. It should work in theory. In practice, however
I wasn't apply to test it because my installation of distributed-process is
apparently broken. Specifically, `spawn` doesn't seem to work (I tested it
with some examples from the Well-Typed blog).
This code depends on https://github.com/timjb/haskell-operational-transformation.
-}
@pauloricardomg
pauloricardomg / cors.nginxconf
Last active Oct 6, 2019
Nginx configuration for CORS-enabled HTTPS proxy with origin white-list defined by a simple regex
View cors.nginxconf
#
# Acts as a nginx HTTPS proxy server
# enabling CORS only to domains matched by regex
# /https?://.*\.mckinsey\.com(:[0-9]+)?)/
#
# Based on:
# * http://blog.themillhousegroup.com/2013/05/nginx-as-cors-enabled-https-proxy.html
# * http://enable-cors.org/server_nginx.html
#
server {
@Fuuzetsu
Fuuzetsu / hackagedocs
Last active Apr 9, 2016
Script for generating and uploading missing documentation for your Hackage packages. Now with fixed package links and contents page.
View hackagedocs
#!/usr/bin/env bash
cabal configure && cabal build && cabal haddock --hyperlink-source \
--html-location='/package/$pkg-$version/docs' \
--contents-location='/package/$pkg'
S=$?
if [ "${S}" -eq "0" ]; then
cd "dist/doc/html"
DDIR="${1}-${2}-docs"
cp -r "${1}" "${DDIR}" && tar -c -v -z --format=ustar -f "${DDIR}.tar.gz" "${DDIR}"
CS=$?
@thomasfr
thomasfr / autossh.service
Last active Nov 2, 2019
Systemd service for autossh
View autossh.service
[Unit]
Description=Keeps a tunnel to 'remote.example.com' open
After=network.target
[Service]
User=autossh
# -p [PORT]
# -l [user]
# -M 0 --> no monitoring
# -N Just open the connection and do nothing (not interactive)
@jozefg
jozefg / closconv.lhs
Last active May 29, 2019
Tutorial on Closure Conversion and Lambda Lifting
View closconv.lhs
This is my short-ish tutorial on how to implement closures in
a simple functional language: Foo.
First, some boilerplate.
> {-# LANGUAGE DeriveFunctor, TypeFamilies #-}
> import Control.Applicative
> import Control.Monad.Gen
> import Control.Monad.Writer
> import Data.Functor.Foldable
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