added shell.nix moved focus point

.gitignore

@@ -0,0 +1,3 @@
+*.o
+*.hi
+asciimandel

asciimandel.hs

@@ -1,7 +1,7 @@
 {-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
 type C=(Double,Double)
 instance Num C where (x,y)*(z,t)=(z*x-y*t,y*z+x*t);(x,y)+(z,t)=(x+z,y+t);abs((x,y))=(sqrt(x*x+y*y),0.0)
-a=27;b=79;c=(-2.0,-1.0);d=(1.0,1.0);e=(-1.064,-0.15);r((x,y))=x;i((x,y))=y
+a=27;b=79;c=(-2.0,-1.0);d=(1.0,1.0);e=(-2.791,-1.0000);r((x,y))=x;i((x,y))=y
 f::C->C->Int->Int
 f c z 0=0;f c z n=if(r(abs(z))>2)then n else f c ((z*z)+c) (n-1)
 h j k = map(\z->(f (z) (0,0) 32,(fst z>l - q/2)))[(x,y)|y<-[p,(p+((o-p)/a))..o],x<-[m,(m + q)..l]]where o=i k;p=i j;m=r j;l=r k;q=(l-m)/b;

shell.nix

@@ -0,0 +1,26 @@
+   { nixpkgs ? import (fetchTarball https://github.com/NixOS/nixpkgs/archive/19.09.tar.gz) {} }:
+   let
+     inherit (nixpkgs) pkgs;
+     inherit (pkgs) haskellPackages;
+
+     haskellDeps = ps: with ps; [
+       base
+       protolude
+       containers
+     ];
+
+     ghc = haskellPackages.ghcWithPackages haskellDeps;
+
+     nixPackages = [
+       ghc
+       pkgs.gdb
+       haskellPackages.cabal-install
+     ];
+   in
+   pkgs.stdenv.mkDerivation {
+     name = "env";
+     buildInputs = nixPackages;
+     shellHook = ''
+        export PS1="\n[hs:\033[1;32m\]\W\[\033[0m\]]> "
+     '';
+   }