tomjaguarpaw

> {-# LANGUAGE Rank2Types #-}
>
> import Prelude hiding (id)
> import Data.Functor.Constant (Constant(Constant), getConstant)
> import Control.Arrow (Arrow, arr, first, Kleisli(Kleisli), runKleisli, (&&&))
> import Control.Category ((<<<))
> import Control.Lens (sequenceAOf)
> import qualified Control.Lens as L
> import qualified Control.Lens.Internal.Setter as LS
> import Data.Profunctor (Profunctor, rmap)

tomjaguarpaw

-- | Traverse the structure using the traversal but memoize the
-- results of the transforming function; this means that the function
-- is called once for every unique element.
--
-- NB: I can't work out how to do this with only one optic argument,
-- but it should be possible.
--
-- prop> traverseNubOf (traverse._1) (traverse._1) (\x -> do print x; return (-x)) [(2,10),(2,20),(1,30),(1,40),(3,50),(3,60)]
-- 1
-- 2

tomjaguarpaw

{-# LANGUAGE RecordWildCards, PatternGuards, ViewPatterns #-}

module Cabal(run, readCabal, extractCabal) where

import Control.Monad.Extra
import Control.Exception.Extra
import Data.Char
import Data.List.Extra
import Data.Maybe
import Data.Functor

tomjaguarpaw

stargazer

Structurally typed arguments and zero extra rubbish

-- Stargazer's, very small, API

-- An option can take a single string argument or nothing at all.
string  :: Schema String
nothing :: Schema ()

tomjaguarpaw

{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE TypeFamilies  #-}
{-# LANGUAGE FlexibleInstances  #-}
{-# LANGUAGE FlexibleContexts  #-}
{-# LANGUAGE ScopedTypeVariables  #-}
{-# LANGUAGE AllowAmbiguousTypes  #-}

module Test2 where

data Proxy a = Proxy

tomjaguarpaw

An Introduction to General Systems Thinking by Gerald M. Weinberg. https://idiscover.lib.cam.ac.uk/permalink/f/t9gok8/44CAM_ALMA21337181530003606 SF4 340:7.c

General Principles of Systems Design by Gerald M. Weinberg and Daniela Weinberg. https://idiscover.lib.cam.ac.uk/permalink/f/t9gok8/44CAM_ALMA21497195560003606 SF4

Peter Senge's Fifth Discipline

tomjaguarpaw

-- Requires branch https://github.com/tomjaguarpaw/haskell-opaleye/tree/dynamic-fields
--
-- If you use this please contact me http://web.jaguarpaw.co.uk/~tom/contact/ and let me
-- know what you think.

import Data.String

import Opaleye
import Opaleye.Internal.Dynamic (SqlDynamic, Dynamic,
                                 stringFromFields, stringUnpackspec)

tomjaguarpaw

{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE DeriveGeneric #-}
{-# OPTIONS_GHC -Wall #-}

module StrangeHashable where

import Data.Hashable
import GHC.Generics (Generic)

data ListF a r = ConsF a r | NilF deriving Generic

tomjaguarpaw

{-# LANGUAGE TemplateHaskell #-}
{-# OPTIONS_GHC -Wall #-}

module Main where

import Control.Lens (makeLenses, use, (%=), (.=))
import Control.Monad (when)
import Control.Monad.Trans.State.Strict (evalState)
import Data.Traversable (for)

tomjaguarpaw

{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UndecidableInstances #-}

import Control.Applicative
import Data.Profunctor