Remove dependency on flake-utils

This reverts commit b5abb09507.

flake-template.nix

@@ -0,0 +1,23 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
+
+  outputs =
+    { self, nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+    in
+    {
+      devShells."${system}".default =
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+          };
+        in
+        pkgs.mkShell {
+          packages = with pkgs; [
+          ];
+
+          shellHook = "";
+        };
+    };
+}

flutter.nix

@@ -3,7 +3,7 @@
 with pkgs;
 
 mkShell {
-  buildInputs = [ dart flutter androidenv.androidPkgs_9_0.androidsdk jdk ];
+  buildInputs = [ flutter hover androidenv.androidPkgs_9_0.androidsdk jdk ];
 
   ANDROID_HOME = "${androidenv.androidPkgs_9_0.androidsdk}/libexec/android-sdk";
   ANDROID_AVD_HOME = (toString ./.) + "/.android/avd";

mysql.nix

@@ -3,7 +3,7 @@
 with pkgs;
 
 let
-  sql_file = "database/db.sql";
+  sql_file = "data/db.sql";
   data_dir = "$(pwd)/.mysql";
   socket = "${data_dir}/mysql.sock";
 
@@ -12,14 +12,20 @@ in mkShell {
 
   shellHook = ''
     trap "kill 0" EXIT
-    [ -d ${data_dir} ] || mkdir ${data_dir}
 
-    mysqld --datadir="${data_dir}" --socket="${socket}" --initialize-insecure
+
+    if [ ! -d ${data_dir} ]; then
+      mysqld --datadir="${data_dir}" --socket="${socket}" --initialize-insecure
+    fi
+
     mysqld --datadir="${data_dir}" --socket="${socket}" --skip-networking --skip-mysqlx &
     sleep 1
 
-    mysql --socket="${socket}" -u root < ${sql_file}
+    if [ ! -d ${data_dir} ]; then
+      mysql --socket="${socket}" -u root < ${sql_file}
+    fi
 
     alias mysql='mysql --socket="${socket}" -u root'
+    alias nuke='rm -rf ${data_dir}'
   '';
 }

nix-ld.nix

@@ -0,0 +1,8 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+mkShell {
+  NIX_LD_LIBRARY_PATH = lib.makeLibraryPath [ stdenv.cc.cc openssl ];
+  NIX_LD = lib.fileContents "${stdenv.cc}/nix-support/dynamic-linker";
+}

postgresql.nix

@@ -0,0 +1,32 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+let
+  sql_file = "data/db.sql";
+  data_dir = "$(pwd)/.pgdata";
+
+in mkShell {
+  buildInputs = [ postgresql ];
+
+  shellHook = ''
+    trap "kill 0" EXIT
+    export PGDATA="${data_dir}"
+    export PGHOST="${data_dir}"
+
+    if [ ! -d ${data_dir} ]; then
+      initdb --auth-local=trust --no-locale --encoding=UTF8
+    fi
+
+    if ! pg_ctl status; then
+      pg_ctl start -o "--unix_socket_directories=${data_dir} --listen_addresses='''"
+    fi
+
+    if [ ! -d ${data_dir} ]; then
+      psql -d postgres -f ${sql_file}
+    fi
+
+    alias psql='psql -d postgres'
+    alias nuke='rm -rf ${data_dir}'
+  '';
+}

python-data-science.nix

@@ -0,0 +1,15 @@
+{ config, lib, pkgs, ... }:
+
+with pkgs;
+
+{
+  buildInputs = [
+    python3
+    python3Packages.jupyter
+    python3Packages.numpy
+    python3Packages.pandas
+    python3Packages.scikit-learn
+    python3Packages.matplotlib
+    python3Packages.seaborn
+  ];
+}

shell.nix

@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+with pkgs;
+
+mkShell {
+  buildInputs = [
+
+  ];
+}

tensorflow-poetry.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+mkShell {
+  buildInputs = [ python38 poetry ];
+  shellHook = ''
+    export LD_LIBRARY_PATH=${pkgs.stdenv.cc.cc.lib}/lib:$LD_LIBRARY_PATH
+    unset SOURCE_DATE_EPOCH
+  '';
+}