initial

.gitignore

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+result
+result-doc
+*.swp
+

LICENSE

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+if u use dis repo u agree to not be a chud.
+military and corps get out.

Main.hs

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+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

README.md

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+# Skeleton Haskell Flake
+
+included is my attempt at a bare bones haskell project, implemented as a nix flake in order to allow reproducible builds.
+
+## building
+
+allows usage within `nix shell`, assuming a flakes system, with the followng:
+
+```
+nix shell github:techieAgnostic/haskeleton#haskeleton
+```
+
+otherwise it can be built normally with:
+
+```
+nix build.
+```
+
+or added to a system configuration by creating an input:
+
+```
+inputs.haskeleton.url = "github:techieAgnostic/haskeleton";
+```
+
+and using the `haskeleton.overlay` attribute to import the program into your pkgset.
+
+## adding hackage dependencies
+
+dependencies can be added to the `haskeleton.cabal` file as normal. the `haskeleton.nix` file must be regenerated once this happens.
+
+> !!!important!!!
+
+in order for this to work without manual editing of `haskeleton.nix`, the command must be run from the `./nix` directory.
+
+```
+cd ./nix
+cabal2nix ../ > haskeleton.nix
+```
+
+for packages not in the nixpkgs repository, or that you would like to have a different version of than appears in the repo, you can add them to the `./nix` directory manually like so:
+
+```
+cabal2nix cabal://name-version > ./nix/name.nix
+```
+
+and in order to disable building tests, documentation, or to jailbreak the dependencies of a package (should the build fail for those reasons), add the packages name to the lists defined in `./release.nix`.

Setup.hs

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+import Distribution.Simple
+main = defaultMain

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1601282935,
+        "narHash": "sha256-WQAFV6sGGQxrRs3a+/Yj9xUYvhTpukQJIcMbIi7LCJ4=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "588973065fce51f4763287f0fda87a174d78bf48",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1604368813,
+        "narHash": "sha256-UOLaURSO448k+4bGJlaSMYeo2F5F6CuFo9VoYDkhmsk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d105075a1fd870b1d1617a6008cb38b443e65433",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-20.09",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "a skeleton haskell flake";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-20.09";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+    let 
+      pkgs = import nixpkgs {
+        overlays = [ (import ./overlay.nix) ];
+        inherit system;
+      };
+    in {
+      defaultPackage = pkgs.haskeleton;
+    }) // {
+      overlay = import ./overlay.nix;
+    };
+}

haskeleton.cabal

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+cabal-version:       >=1.10
+-- Initial package description 'haskeleton.cabal' generated by 'cabal
+-- init'.  For further documentation, see
+-- http://haskell.org/cabal/users-guide/
+
+name:                haskeleton
+version:             0.1.0.0
+-- synopsis:
+-- description:
+-- bug-reports:
+-- license:
+license-file:        LICENSE
+author:              Thorn Avery
+maintainer:          s@p7.co.nz
+-- copyright:
+-- category:
+build-type:          Simple
+
+executable haskeleton
+  main-is:             Main.hs
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       base >=4.13 && <4.14
+                     , text
+                     , aeson
+  -- hs-source-dirs:
+  default-language:    Haskell2010

nix/haskeleton.nix

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+{ mkDerivation, aeson, base, stdenv, text }:
+mkDerivation {
+  pname = "haskeleton";
+  version = "0.1.0.0";
+  src = ./..;
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [ aeson base text ];
+  license = "unknown";
+  hydraPlatforms = stdenv.lib.platforms.none;
+}

overlay.nix

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+final: prev: {
+  haskeleton = (import ./release.nix) prev;
+}

release.nix

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+bspkgs: 
+let
+  dontCheckPackages = [ ];
+  doJailbreakPackages = [ ];
+  dontHaddockPackages = [ ];
+  config = {
+    packageOverrides = pkgs: rec {
+      haskellPackages =
+        let
+          generatedOverrides = haskellPackagesNew: haskellPackagesOld:
+            let
+              toPackage = file: _: {
+                name = builtins.replaceStrings [ ".nix" ] [ "" ] file;
+                value = haskellPackagesNew.callPackage
+                  ( ./. + "/nix/${file}") { };
+              };
+            in
+              pkgs.lib.mapAttrs' toPackage
+                (builtins.readDir ./nix);
+          makeOverrides =
+            function: names: haskellPackagesNew: haskellPackagesOld:
+              let
+                toPackage = name: {
+                  inherit name;
+                  value = function haskellPackagesOld.${name};
+                };
+              in
+                builtins.listToAttrs (map toPackage names);
+          composeExtensionsList =
+            pkgs.lib.fold pkgs.lib.composeExtensions (_: _: {});
+          manualOverrides = haskellPackagesNew: haskellPackagesOld: {
+          };
+        in
+          pkgs.haskellPackages.override {
+            overrides = composeExtensionsList [
+              generatedOverrides
+              (makeOverrides pkgs.haskell.lib.dontCheck dontCheckPackages)
+              (makeOverrides pkgs.haskell.lib.doJailbreak doJailbreakPackages)
+              (makeOverrides pkgs.haskell.lib.dontHaddock dontHaddockPackages)
+              manualOverrides
+            ];
+          };
+    };
+  };
+  pkgs = import bspkgs.path { inherit config; system = bspkgs.system; };
+in
+  pkgs.haskellPackages.haskeleton