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Dan Frumin co-dan

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View smile.pl
#!/usr/bin/perl
use Irssi;
use vars qw($VERSION %IRSSI);
use warnings;
use strict;
##use common::sense;
##use Modern::Perl 2012;
Irssi::command_bind smile => \⌣
View gist:4088395
(* Kevin Sullivan <sullivan.kevinj@gmail.com>, writing to the Coq-Club: *)
(* My students presented two solutions to the simple problem of applying a *)
(* function f n times to an argument x (iterated composition). The first says *)
(* apply f to the result of applying f n-1 times to x; the second, apply f n-1 *)
(* times to the result of applying f to x. I challenged one student to prove that *)
(* the programs are equivalent. This ought to be pretty easy based on the *)
(* associativity of composition. Your best solution? *)
Fixpoint ant {X: Type} (f: X->X) (x: X) (n: nat) : X :=
match n with
@co-dan
co-dan / MaybeT.hs
Created Dec 13, 2012
Maybe monad transformer
View MaybeT.hs
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, UndecidableInstances #-}
module MaybeT where
-- Maybe monad transformer
import Control.Monad
import Control.Monad.Trans
import Control.Monad.Reader
import Control.Monad.Writer
import Control.Monad.State
newtype MaybeT m a = MaybeT { runMaybeT :: m (Maybe a) }
@co-dan
co-dan / gist:4358385
Created Dec 22, 2012
Generating HTML page from Calibre's catalog
View gist:4358385
{-# LANGUAGE OverloadedStrings, ScopedTypeVariables #-}
module Main where
import Text.Blaze.Html5
import qualified Text.Blaze.Html5 as H
import Text.Blaze.Html5.Attributes
import qualified Text.Blaze.Html5.Attributes as A
import Text.Blaze.Html.Renderer.Pretty
import Data.Csv
View Tests.lhs
> showReadIso :: Expr -> Bool
> showReadIso e = parseExpr (show' e) == e
*Tests> quickCheck showReadIso
*** Failed! Falsifiable (after 34 tests):
Prod (Variable "d") (Prod (Variable "b") (Universe 9) (Prod (Variable "a") (Prod (Variable "c") (Var (Variable "a")) (App (Lambda (Variable "c") (Var (Variable "b")) (Universe 8)) (Prod (Variable "a") (Universe 1) (Var (Variable "c"))))) (Prod (Variable "b") (Lambda (Variable "c") (App (Universe 2) (Universe 5)) (Var (Variable "c"))) (App (Var (Variable "b")) (Lambda (Variable "d") (Var (Variable "a")) (Universe 7)))))) (App (Prod (Variable "a") (Lambda (Variable "d") (Universe 9) (Prod (Variable "a") (App (Var (Variable "b")) (Var (Variable "d"))) (App (Var (Variable "a")) (Var (Variable "a"))))) (Prod (Variable "a") (App (Prod (Variable "c") (Var (Variable "b")) (Var (Variable "c"))) (Prod (Variable "d") (Var (Variable "b")) (Universe 10))) (Prod (Variable "d") (Lambda (Variable "a") (Var (Variable "c")) (Var (Variable "d"))) (Prod (Variable "c") (Universe 5) (
View PgsqlTest.hs
{-# LANGUAGE OverloadedStrings, DeriveDataTypeable, ScopedTypeVariables #-}
import Database.PostgreSQL.Simple
import Database.PostgreSQL.Simple.FromRow
import Database.PostgreSQL.Simple.FromField
import Data.Typeable
import Control.Applicative
View Automata.hs
module Automata where
import Prelude hiding (or, foldl)
import Control.Monad
import Data.Foldable hiding (elem)
import Control.Monad.Identity
data Automata q s m = A { states :: [q]
, trans :: (q, s) -> m q
View fnctrcomposition.hs
import Data.Functor.Compose
data N n = N { unN :: n Int }
f :: (Functor n, Functor m) => (Int -> m Int) -> N n -> N (Compose n m)
f h = N . Compose . fmap h . unN
-- f h (N x) = N $ Compose (fmap h x)
@co-dan
co-dan / Takeout.hs
Created Mar 17, 2013
Using HXT to parse the OPML file you've exported from Google Reader
View Takeout.hs
import Text.XML.HXT.Core
doc = "/Users/dan/Downloads/greader-takeout/Reader/subscriptions.xml"
type Subscriptions = [(String, String)]
getSites :: ArrowXml a => a XmlTree (String,String)
getSites = isElem
>>> hasAttrValue "type" (=="rss")
>>> getAttrValue "htmlUrl" &&& getAttrValue "xmlUrl"
View orgsetup.el
(setq load-path (append '("~/projects/emacs/org-mode/lisp" "~/projects/emacs/org-mode/contrib/lisp") load-path))
(require 'org)
(custom-set-faces
'(org-link ((t (:foreground "aqua" :underline t))))
'(org-date ((t (:foreground "RoyalBlue1" :underline t)))))
;; IDO
(setq org-completion-use-ido t)
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