add(1521) - Add nix flake, justfile, and direnv

.gitignore

@@ -143,3 +143,5 @@ tags
 
 # temp files
 temp/
+/.direnv/
+/.envrc

flake.nix

@@ -0,0 +1,50 @@
+{
+  description = "Sceptre development environment";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+    in {
+      devShells.default = pkgs.mkShell {
+        # buildInputs = with pkgs; [
+        #   poetry
+        # ];
+        packages = with pkgs; [
+          nix-search-cli
+          pre-commit
+          just
+          watchexec
+
+          # Make sure nix works within the shell
+          nixStatic
+
+          # Python
+          poetry
+          python3
+
+          # Other packages needed for compiling python libs
+          readline
+          libffi
+          openssl
+          glibcLocalesUtf8
+        ];
+
+        shellHook = ''
+          poetry env use $(which python3)
+          poetry install
+          . $(poetry env info -p)/bin/activate
+        '';
+      };
+    });
+}

justfile

@@ -0,0 +1,24 @@
+_default:
+    @just --list
+
+# Enable direnv
+enable-direnv:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    [ -f ".envrc" ] && echo ".envrc already exists" && exit
+    echo "use flake" >.envrc
+
+# Re-run recipe CMD whenever files change
+watch CMD *ARGS:
+    watchexec -c -r -d 500ms --print-events -- just {{CMD}} {{ARGS}}
+alias w := watch
+
+# Run tests via tox
+test *ARGS:
+    poetry run tox {{ARGS}}
+alias t := test
+
+# Run a single test
+a-test TEST *ARGS:
+    poetry run pytest -ssv {{TEST}} {{ARGS}}
+alias tt := a-test