feat: add Nix / direnv integration (#1)

Author: V

.envrc

@@ -0,0 +1 @@
+use nix

.gitignore

@@ -1 +1,10 @@
 /target
+result
+.direnv
+.envrc.local
+
+*~
+*.bak
+*.orig
+*.sw[a-z]
+*.tmp

default.nix

@@ -0,0 +1,9 @@
+(import (
+  let
+    fc = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.flake-compat.locked;
+  in
+  fetchTarball {
+    url = fc.url or "https://github.com/edolstra/flake-compat/archive/${fc.rev}.tar.gz";
+    sha256 = fc.narHash;
+  }
+) { src = ./.; }).defaultNix

flake.lock

@@ -0,0 +1,70 @@
+{
+  description = "Terminal-based Sefaria query tool";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+  };
+
+  outputs =
+    inputs:
+    let
+      forEachSystem =
+        f:
+        inputs.nixpkgs.lib.genAttrs [
+          "x86_64-linux"
+          "x86_64-darwin"
+          "aarch64-linux"
+          "aarch64-darwin"
+        ] (system: f (import inputs.nixpkgs { inherit system; }));
+    in
+    {
+      packages = forEachSystem (pkgs: {
+        default = pkgs.callPackage (
+          {
+            lib,
+            openssl,
+            pkg-config,
+            rustPlatform,
+          }:
+          let
+            manifest = (lib.importTOML ./Cargo.toml).package;
+          in
+          rustPlatform.buildRustPackage {
+            pname = manifest.name;
+            inherit (manifest) version;
+            src = lib.cleanSource ./.;
+            cargoLock.lockFile = ./Cargo.lock;
+            nativeBuildInputs = [ pkg-config ];
+            buildInputs = [ openssl ];
+          }
+        ) { };
+      });
+      devShells = forEachSystem (pkgs: {
+        default = pkgs.callPackage (
+          {
+            cargo,
+            clippy,
+            mkShellNoCC,
+            rust-analyzer,
+            rustc,
+            rustfmt,
+            rustPlatform,
+          }:
+          mkShellNoCC {
+            packages = [
+              cargo
+              clippy
+              rust-analyzer
+              rustc
+              rustfmt
+            ];
+            RUST_SRC_PATH = "${rustPlatform.rustLibSrc}";
+          }
+        ) { };
+      });
+    };
+}

flake.nix

@@ -0,0 +1,9 @@
+(import (
+  let
+    fc = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.flake-compat.locked;
+  in
+  fetchTarball {
+    url = fc.url or "https://github.com/edolstra/flake-compat/archive/${fc.rev}.tar.gz";
+    sha256 = fc.narHash;
+  }
+) { src = ./.; }).shellNix