diff --git a/Data/Default.hs b/Data/Default.hs new file mode 100644 --- /dev/null +++ b/Data/Default.hs @@ -0,0 +1,118 @@ +-- Copyright 2016 Ertugrul Söylemez +-- +-- Licensed under the Apache License, Version 2.0 (the "License"); +-- you may not use this file except in compliance with the License. +-- You may obtain a copy of the License at +-- +-- http://www.apache.org/licenses/LICENSE-2.0 +-- +-- Unless required by applicable law or agreed to in writing, software +-- distributed under the License is distributed on an "AS IS" BASIS, +-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +-- See the License for the specific language governing permissions and +-- limitations under the License. + +{-# OPTIONS_GHC -fno-warn-overflowed-literals #-} + +-- | +-- Module: Data.Default +-- Copyright: Copyright 2016 Ertugrul Söylemez +-- License: Apache License 2.0 +-- Maintainer: Ertugrul Söylemez +-- +-- This module defines a class for types with a distinguished value that +-- someone considers aesthetically pleasing. If you would like your +-- favourite value featured as the default in the next release, become +-- that someone now! Just create an issue on the +-- ! + +module Data.Default + ( -- * Default class + Default(..) + ) + where + +import Data.Int +import Data.Word + + +-- | A class for types with a distinguished value that someone considers +-- aesthetically pleasing. + +class Default a where + -- | The currently selected default value. + def :: a + +-- | Current default @def@ chosen by ertes for the same reason as the +-- instance for @()@. +instance Default () where def = def + +instance (Default a, Default b) => Default (a, b) where + def = (def, def) + +instance (Default a, Default b, Default c) => Default (a, b, c) where + def = (def, def, def) + +instance (Default a, Default b, Default c, Default d, Default e) => Default (a, b, c, d, e) where + def = (def, def, def, def, def) + +instance (Default a, Default b, Default c, Default d, Default e, Default f) => Default (a, b, c, d, e, f) where + def = (def, def, def, def, def, def) + +-- | Current default @'replicate' 4 def@ chosen by mniip, because 4 is a +-- random number. +instance (Default a) => Default [a] where def = replicate 4 def + +-- | Current default 'False' chosen by ertes, the answer to the question +-- whether mniip has a favourite 'Bool'. +instance Default Bool where def = False + +-- | Current default @'→'@ chosen by sleblanc`, because arrows look +-- fancy when you use them in a chat. +instance Default Char where def = '→' + +-- | Current default @1.1102230246251565e-16@ chosen by ertes, the +-- difference between @1@ and @'sum' ('replicate' 10 0.1)@. +instance Default Double where def = 1.1102230246251565e-16 + +-- | Current default @388.38@ chosen by ertes, because it's beautiful in +-- decimal and approximately equal to twice the molar mass of caffeine +-- in grams per mol. +instance Default Float where def = 388.38 + +-- | Current default @18871@ chosen by ertes, a beautiful product of a +-- Sophie-Germain prime and a safe prime. +instance Default Int where def = 18871 + +-- | Current default @29@ chosen by ertes for obvious reasons. +instance Default Int8 where def = 29 + +-- | Current default @-99@ chosen by ertes, the largest prime that +-- generates a multiplicative subgroup of maximal order modulo @2^16@. +instance Default Int16 where def = -99 + +-- | Current default @-1@ chosen by ertes, the largest negative number. +instance Default Int64 where def = -1 + +-- | Current default is Graham's number G chosen by ertes. +instance Default Integer where def = error "Out of memory" + +-- | Current default @10@ chosen by ertes, the fifth triangular number +-- that also happens to be the base of the most common positional +-- notation in use for numbers. +instance Default Word where def = 10 + +-- | Current default @216@ chosen by ertes, the volume of the largest cube +-- with integer side length. +instance Default Word8 where def = 216 + +-- | Current default @6@ chosen by ertes, the smallest perfect number. +instance Default Word16 where def = 6 + +-- | Current default @4294967296@ chosen by Axman6 and mniip, because +-- it's equal to @0@. +instance Default Word32 where def = 4294967296 + +-- | Current default @17@ chosen by ertes. It just looks nice in decimal +-- when written with serifs on the first digit. +instance Default Word64 where def = 17 diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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Such a +value is commonly referred to as a *default* value. + +This package exists to introduce artistic variety regarding the +aesthetics of Haskell's base types, but is otherwise identical in +purpose to [data-default]. + +[data-default]: https://hackage.haskell.org/package/data-default diff --git a/Setup.lhs b/Setup.lhs new file mode 100644 --- /dev/null +++ b/Setup.lhs @@ -0,0 +1,21 @@ +Setup script +Copyright 2016 Ertugrul Söylemez + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. + +> module Main where +> +> import Distribution.Simple +> +> main :: IO () +> main = defaultMain diff --git a/acme-default.cabal b/acme-default.cabal new file mode 100644 --- /dev/null +++ b/acme-default.cabal @@ -0,0 +1,53 @@ +-- Copyright 2016 Ertugrul Söylemez +-- +-- Licensed under the Apache License, Version 2.0 (the "License"); +-- you may not use this file except in compliance with the License. +-- You may obtain a copy of the License at +-- +-- http://www.apache.org/licenses/LICENSE-2.0 +-- +-- Unless required by applicable law or agreed to in writing, software +-- distributed under the License is distributed on an "AS IS" BASIS, +-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +-- See the License for the specific language governing permissions and +-- limitations under the License. + +name: acme-default +version: 0.1.0 +category: ACME +synopsis: A class for types with a distinguished aesthetically pleasing value + +maintainer: Ertugrul Söylemez +author: Ertugrul Söylemez +copyright: Copyright 2016 Ertugrul Söylemez +homepage: http://hub.darcs.net/esz/acme-default +bug-reports: http://hub.darcs.net/esz/acme-default/issues +license: Apache +license-file: LICENSE + +description: This package defines a type class for types with certain + distinguished values that someone considers to be aesthetically + pleasing. Such a value is commonly referred to as a /default/ + value. + . + This package exists to introduce artistic variety regarding the + aesthetics of Haskell's base types, but is otherwise identical in + purpose to + . + +build-type: Simple +cabal-version: >= 1.10 +extra-source-files: NOTICE README.md + +source-repository head + type: darcs + location: http://hub.darcs.net/esz/acme-default + + +library + build-depends: + base >= 4.8 && < 5 + default-language: Haskell2010 + ghc-options: -W -fdefer-typed-holes + exposed-modules: + Data.Default