Add common dev environment in Nix

db.nix

@@ -1,12 +0,0 @@
-with
-  import (builtins.fetchTarball {
-    url = "https://github.com/nixos/nixpkgs/archive/4d373182597cff60b3a820affb5a73dd274e205b.tar.gz";
-    sha256 = "1kvsnlsq1czgk085rllg1b427n6lv5w3a2z1igfc95n81jpvcf58";
-  }) {};
-let
-in
-  stdenv.mkDerivation rec {
-    name = "tinyquiz-db-env";
-
-    buildInputs = [ postgresql ];
-  }

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1611053426,
+        "narHash": "sha256-ZYcn9Jz7S3Ib3PPcPsn6lE9HGtH5ofacOYsu/puZd9o=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "646f528cce6db1f89f6e635a7589bf1be6169ffb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-20.09",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "Tinyquiz – an open source online quiz platform";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-20.09";
+
+  outputs = { self, nixpkgs }:
+  let
+    pkgs = nixpkgs.legacyPackages.x86_64-linux;
+  in
+    {
+      defaultPackage.x86_64-linux = self.packages.x86_64-linux.tinyquiz;
+      packages.x86_64-linux.tinyquiz = pkgs.hello; # TODO
+      packages.x86_64-linux.dev = pkgs.writeShellScriptBin "dev" ''
+        echo "This dev script must be run from the project root, otherwise unexpected behavior might occur."
+        read -p "Are you in the right directory and shall I continue? (y/n): " ack
+
+        if [ "$ack" != y ]; then exit 1; fi
+
+        unset GOROOT # Use the one bundled into the binary. I don't currently know who sets this to the wrong one
+
+        '${pkgs.findutils}/bin/find' cmd pkg ui/html | '${pkgs.entr}/bin/entr' -dr '${pkgs.go_1_14}/bin/go' run ./cmd/web
+      '';
+      packages.x86_64-linux.devDb = pkgs.writeShellScriptBin "devDb" ''
+        '${pkgs.postgresql}/bin/postgres' -D .pg-data -k "$PWD/.pg-sockets" #-c listen_addresses="" # Goland does not support connecting over socket
+      '';
+    };
+}