From ee72ffbd8cb4f180e19a83927c346bcc3c1e6806 Mon Sep 17 00:00:00 2001
From: Dhananjay Balan <mail@dbalan.in>
Date: Wed, 15 Nov 2023 09:47:53 +0100
Subject: [PATCH] flake: init flake support

---
 blogng.cabal |  6 +++---
 default.nix  | 21 ------------------
 flake.lock   | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 flake.nix    | 55 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 118 insertions(+), 24 deletions(-)
 delete mode 100644 default.nix
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/blogng.cabal b/blogng.cabal
index 729b714..fe419ac 100644
--- a/blogng.cabal
+++ b/blogng.cabal
@@ -5,9 +5,9 @@ cabal-version:      >= 1.10
 
 executable site
   main-is:          site.hs
-  build-depends:    base == 4.*
-                  , hakyll == 4.13.*
-                  , filepath >= 1.4
+  build-depends:    base
+                  , hakyll
+                  , filepath
                   , regex-compat
   ghc-options:      -threaded
   default-language: Haskell2010
diff --git a/default.nix b/default.nix
deleted file mode 100644
index 7b0292b..0000000
--- a/default.nix
+++ /dev/null
@@ -1,21 +0,0 @@
-# Development workflow
-# - Executing nix-build builds the packages
-# - Executing nix-shell returns a shell environment containing
-#   1. Haskell packages needed
-#   2. Hoogle files for packages
-#   3. cabal and ghcid installed
-{ pkgs ? import <unstable> {}
-}:
-pkgs.haskellPackages.developPackage {
-  root = ./.;
-  name = "blogng";
-  modifier = drv:
-    # add buildtools such as cabal
-    pkgs.haskell.lib.addBuildTools drv
-      (with pkgs.haskellPackages; [
-        cabal-install
-        ghcid
-        # install hoogle files for packages we use.
-        #(hoogleLocal {packages = drv.propagatedBuildInputs;})
-      ]);
-}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..ba7113d
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1700037593,
+        "narHash": "sha256-Jy5mdQKTONK5M3pE7aQUFudDOOz+prpwJYAL2HbJsE4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "28189330044e1fe145c55dc9560474121ae21ad9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..30c77d0
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,55 @@
+{
+  description = "blogng";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        haskellPackages = pkgs.haskellPackages;
+
+        builder = pkgs.haskellPackages.callCabal2nix "blogng" ./. { };
+      in {
+
+        packages.default = self.packages.${system}.website;
+        defaultPackage = self.packages.${system}.default;
+
+        packages.website = pkgs.stdenv.mkDerivation rec {
+          name = "blog";
+          LANG = "en_US.UTF-8";
+          LC_ALL = "en_US.UTF-8";
+          LOCALE_ARCHIVE = "${pkgs.glibcLocales}/lib/locale/locale-archive";
+
+          src = ./.;
+
+          # use the haskell package to build the website
+          buildInputs = [ builder ];
+          allowSubstitutes = false;
+          buildPhase = ''
+            mkdir public
+            ${builder}/bin/site build
+          '';
+          installPhase = ''
+            mkdir -p $out/
+            cp -R public/* $out/
+          '';
+          dontStrip = true;
+        };
+
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            haskellPackages.haskell-language-server # you must build it with your ghc to work
+            ghcid
+            cabal-install
+          ];
+          inputsFrom =
+            map (__getAttr "env") (__attrValues self.packages.${system});
+        };
+        devShell = self.devShells.${system}.default;
+      });
+}