From 5b13f77fe12bbcf2f84f086911fe8deaa9463fa9 Mon Sep 17 00:00:00 2001
From: "Yann Esposito (Yogsototh)" <yann.esposito@gmail.com>
Date: Mon, 3 Feb 2020 10:10:41 +0100
Subject: [PATCH] cleaner nix file

---
 src/posts/0011-Haskell-Projects/shell.nix | 76 ++++++++++++-----------
 1 file changed, 40 insertions(+), 36 deletions(-)

diff --git a/src/posts/0011-Haskell-Projects/shell.nix b/src/posts/0011-Haskell-Projects/shell.nix
index 42b005b..8c15836 100644
--- a/src/posts/0011-Haskell-Projects/shell.nix
+++ b/src/posts/0011-Haskell-Projects/shell.nix
@@ -1,40 +1,44 @@
+{ nixpkgs ? import (fetchGit {
+  name = "nixos-release-19.09";
+  url = "https://github.com/NixOS/nixpkgs";
+  # obtained via
+  # git ls-remote https://github.com/nixos/nixpkgs master
+  ref = "refs/heads/nixpkgs-19.09-darwin";
+  rev = "d5291756487d70bc336e33512a9baf9fa1788faf";
+}) { config = { allowBroken = true; }; } }:
 let
-     config = { allowBroken = true; };
+  inherit (nixpkgs) pkgs;
+  inherit (pkgs) haskellPackages;
+
+  haskellDeps = ps: with ps; [
+    base
+    protolude
+    containers
+  ];
+
+  hspkgs = haskellPackages;
+
+  # ### how to override package version
+  # hspkgs = haskellPackages.extend (self: super: {
+  #   summoner = self.callHackage "summoner" "1.4.0.0" {};
+  #   # summoner-tui = self.callHackage "summoner-tui" "1.4.0.0" {};
+  # });
+
+  ghc = hspkgs.ghcWithPackages haskellDeps;
+
+  nixPackages = [
+    ghc
+    pkgs.gdb
+    hspkgs.summoner
+    hspkgs.summoner-tui
+    haskellPackages.cabal-install
+    haskellPackages.ghcid
+  ];
 in
-   { nixpkgs ? import (fetchGit {
-     name = "nixos-release-19.09";
-     url = "https://github.com/NixOS/nixpkgs";
-     # obtained via
-     # git ls-remote https://github.com/nixos/nixpkgs master
-     ref = "refs/heads/nixpkgs-19.09-darwin";
-     rev = "d5291756487d70bc336e33512a9baf9fa1788faf";
-   }) { inherit config; } }:
-   let
-     inherit (nixpkgs) pkgs;
-     inherit (pkgs) haskellPackages;
-
-     haskellDeps = ps: with ps; [
-       base
-       protolude
-       containers
-     ];
-
-     ghc = haskellPackages.ghcWithPackages haskellDeps;
-
-     nixPackages = [
-       ghc
-       pkgs.gdb
-       # haskellPackages.haskell-overridez
-       haskellPackages.summoner
-       haskellPackages.summoner-tui
-       haskellPackages.cabal-install
-       haskellPackages.ghcid
-     ];
-   in
-   pkgs.stdenv.mkDerivation {
-     name = "env";
-     buildInputs = nixPackages;
-     shellHook = ''
+pkgs.stdenv.mkDerivation {
+  name = "env";
+  buildInputs = nixPackages;
+  shellHook = ''
         export PS1="\n\[[hs:\033[1;32m\]\W\[\033[0m\]]> "
      '';
-   }
+}