Skip to content

Instantly share code, notes, and snippets.

Daniel Stankevich danstn

  • Melbourne, Australia
Block or report user

Report or block danstn

Hide content and notifications from this user.

Learn more about blocking users

Contact Support about this user’s behavior.

Learn more about reporting abuse

Report abuse
View GitHub Profile
View servant-custom-monad-basic-auth.hs
newtype PrivateData = PrivateData { ssshhh :: Text }
deriving (Eq, Show, Generic)
newtype PublicData = PublicData { somedata :: Text }
deriving (Eq, Show, Generic)
instance ToJSON PrivateData
instance ToJSON PublicData
type PublicAPI = Get '[JSON] [PublicData]
danstn /
Created Apr 25, 2017
Home Certificate Authority
set -e
echo -n "Enter server name (i.e. nginx-server): "
read server
echo "===> [INFO] Generating certs for: $server"
echo "===> [Step 1] Generating Certificate Request (CSR)..."
danstn / reasonable.hs
Created Mar 29, 2016 — forked from aaronlevin/reasonable.hs
Reasonably Priced Monads in Haskell
View reasonable.hs
-- | simple/basic Scala -> Haskell translation of Runar's presentation
-- | (
-- | trying to use minimal extensions and magic.
-- | (earlier I had a version using MultiParamTypeClasses for Runar's
-- | Inject class, but scraped it opting for simplicity)
-- | my question: what do we lose by moving towards simplicity?
-- | Future work: use DataKinds, TypeOperators, and potentially TypeFamilies
-- | to maintain and automate the folding of types in Coproduct.
{-# LANGUAGE Rank2Types, DeriveFunctor #-}
danstn / gist:c9725862f5ec0cb69063
Created Mar 29, 2016 — forked from runarorama/gist:a8fab38e473fafa0921d
Compositional application architecture with reasonably priced monads
View gist:c9725862f5ec0cb69063
sealed trait Interact[A]
case class Ask(prompt: String)
extends Interact[String]
case class Tell(msg: String)
extends Interact[Unit]
trait Monad[M[_]] {
def pure[A](a: A): M[A]
danstn / free-monad-example.hs
Last active Jan 4, 2017
An example of using Free Monads for writing custom AST/DSL and its interpreters.
View free-monad-example.hs
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE DeriveFunctor #-}
import Prelude
import Data.String
import Control.Monad.Free
type Program a r = Free (AST a) r
data AST a next =
danstn / watch.hs
Last active Aug 29, 2015
Very simple Haskell watcher
View watch.hs
#!/usr/bin/env runhaskell
{-# LANGUAGE OverloadedStrings #-}
import Turtle
main :: IO ()
main = do
stdout (runWatch $ findSrc)
danstn / chjava
Last active Aug 29, 2015
chjava bash function
View chjava
function chjava() {
if [ $# -ne 0 ]; then
removeFromPath '/System/Library/Frameworks/JavaVM.framework/Home/bin'
if [ -n "${JAVA_HOME+x}" ]; then
removeFromPath $JAVA_HOME
export JAVA_HOME=`/usr/libexec/java_home -v $@`
export PATH=$JAVA_HOME/bin:$PATH
danstn / opt_type.scala
Last active Aug 29, 2015
My Opt type implementation
View opt_type.scala
sealed trait Opt[+A] {
def flatMap[T](f: A => Opt[T]): Opt[T] =
def map[T](f: A => T): Opt[T] =
fold[Opt[T]](Nothing)(a => Something(f(a)))
def fold[B](g: => B)(f: A => B): B =
this match {
case Something(a) => f(a)
View eq_indices.rb
# An equilibrium index of a sequence is an index into the sequence
# such that the sum of elements at lower indices is equal to the
# sum of elements at higher indices.
def eq_indices(arr)
left, right = 0, arr.inject(0, :+)
result = []
arr.each_with_index do |el, i|
right -= el
result << i if right == left
You can’t perform that action at this time.