Set up nix develop to work with nix flakes

flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1622445595,
+        "narHash": "sha256-m+JRe6Wc5OZ/mKw2bB3+Tl0ZbtyxxxfnAWln8Q5qs+Y=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "7d706970d94bc5559077eb1a6600afddcd25a7c8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1622702532,
+        "narHash": "sha256-XAIvN+XyobDs8PmpwAO3Bto2zJBFAdTCNsjh6bBpH9g=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b42f9c725475e85d014dede34eaa7aaf1483b223",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Automated deployment of my datasette instance.";
+
+  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.${system}; in
+        {
+          devShell = import ./shell.nix { inherit pkgs; };
+        }
+      );
+  # outputs = { self, nixpkgs, flake-utils, ... }:
+  #   flake-utils.lib.eachDefaultSystem
+  #     (system:
+  #     let pkgs.legacyPackages.${system}; in
+  #     {
+  #         devShell = import ./shell.nix { inherit pkgs; };
+  #       }
+  #     );
+}

shell.nix

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+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  lib = pkgs.lib;
+in pkgs.mkShell rec {
+  name = "datasette";
+  buildInputs = with pkgs; [
+    sqlite
+    libspatialite
+    spatialite_tools
+    rlwrap
+
+    datasette
+  ];
+
+  LD_LIBRARY_PATH = "${lib.makeLibraryPath buildInputs}";
+
+  shellHook = ''
+    datasette \
+      --load-extension=mod_spatialite.so \
+      -m metadata.yml -h 0.0.0.0 --cors --setting default_cache_ttl 1800 \
+      --immutable dbs/*.db
+    datasette dbs/*
+  '';
+}