diff --git a/Cargo.lock b/Cargo.lock
index 070db3c..c0306d5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,21 +3,29 @@
 version = 3
 
 [[package]]
-name = "alejandra"
+name = "alejandra_cli"
 version = "0.3.1"
 dependencies = [
+ "alejandra_engine",
  "atty",
  "clap",
  "indoc",
- "rand",
  "rayon",
- "rnix",
- "rowan",
  "termion",
  "tui",
  "walkdir",
 ]
 
+[[package]]
+name = "alejandra_engine"
+version = "0.3.1"
+dependencies = [
+ "clap",
+ "rand",
+ "rnix",
+ "rowan",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.14"
diff --git a/Cargo.toml b/Cargo.toml
index 5a37bcb..08784fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,19 +1,2 @@
-[dependencies]
-atty = "*"
-clap = { version = "*", features = ["cargo"] }
-indoc = "*"
-rand = "*"
-rayon = "*"
-rnix = "*"
-termion = "*"
-tui = { version = "*", default-features = false, features = ["termion"] }
-rowan = "0.12.6" # follows rnix
-walkdir = "*"
-
-[package]
-authors = ["Kevin Amado <kamadorueda@gmail.com>"]
-description = "The Uncompromising Nix Code Formatter"
-edition = "2021"
-name = "alejandra"
-repository = "https://github.com/kamadorueda/alejandra"
-version = "0.3.1"
+[workspace]
+members = ["src/*"]
diff --git a/buildkite.yaml b/buildkite.yaml
index bac873a..43d1cf4 100644
--- a/buildkite.yaml
+++ b/buildkite.yaml
@@ -74,11 +74,6 @@ steps:
       - echo +++ Derivations count
       - grep -c drvPath= closure-after.txt
 
-  - label: flake check
-    command:
-      - echo +++
-      - nix flake check
-
   - label: lint
     if: build.branch != "main"
     command:
@@ -87,3 +82,8 @@ steps:
       - eval "$(direnv export bash)"
       - echo +++ Run Linter
       - cargo clippy
+
+  - label: flake check
+    command:
+      - echo +++
+      - nix flake check
diff --git a/flake.nix b/flake.nix
index c2bc584..63e39ad 100644
--- a/flake.nix
+++ b/flake.nix
@@ -103,6 +103,7 @@
           cargo-bloat
           cargo-license
           cargo-tarpaulin
+          clippy
           jq
           nodejs
           nodePackages.prettier
diff --git a/front/Cargo.lock b/front/Cargo.lock
index 56dc552..20dc0a7 100644
--- a/front/Cargo.lock
+++ b/front/Cargo.lock
@@ -3,23 +3,20 @@
 version = 3
 
 [[package]]
-name = "alejandra"
+name = "alejandra_engine"
 version = "0.3.1"
 dependencies = [
  "clap",
- "indoc",
  "rand",
- "rayon",
  "rnix",
- "rowan 0.15.3",
- "walkdir",
+ "rowan",
 ]
 
 [[package]]
-name = "alejandra-front"
+name = "alejandra_front"
 version = "0.3.1"
 dependencies = [
- "alejandra",
+ "alejandra_engine",
  "console_error_panic_hook",
  "getrandom",
  "wasm-bindgen",
@@ -78,9 +75,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "clap"
-version = "3.1.0"
+version = "3.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5f1fea81f183005ced9e59cdb01737ef2423956dac5a6d731b06b2ecfaa3467"
+checksum = "6d76c22c9b9b215eeb8d016ad3a90417bd13cb24cf8142756e6472445876cab7"
 dependencies = [
  "atty",
  "bitflags",
@@ -108,62 +105,6 @@ version = "2.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "328b822bdcba4d4e402be8d9adb6eebf269f969f8eadef977a553ff3c4fbcb58"
 
-[[package]]
-name = "countme"
-version = "3.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03746e0c6dd9b5d2d9132ffe0bede35fb5f815604fd371bb42599fd37bc8e483"
-
-[[package]]
-name = "crossbeam-channel"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e54ea8bc3fb1ee042f5aace6e3c6e025d3874866da222930f70ce62aceba0bfa"
-dependencies = [
- "cfg-if 1.0.0",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-deque"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6455c0ca19f0d2fbf751b908d5c55c1f5cbc65e03c4225427254b46890bdde1e"
-dependencies = [
- "cfg-if 1.0.0",
- "crossbeam-epoch",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-epoch"
-version = "0.9.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c00d6d2ea26e8b151d99093005cb442fb9a37aeaca582a03ec70946f49ab5ed9"
-dependencies = [
- "cfg-if 1.0.0",
- "crossbeam-utils",
- "lazy_static",
- "memoffset",
- "scopeguard",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.8.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5e5bed1f1c269533fa816a0a5492b3545209a205ca1a54842be180eb63a16a6"
-dependencies = [
- "cfg-if 1.0.0",
- "lazy_static",
-]
-
-[[package]]
-name = "either"
-version = "1.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
-
 [[package]]
 name = "getrandom"
 version = "0.2.4"
@@ -189,12 +130,6 @@ version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
 
-[[package]]
-name = "hashbrown"
-version = "0.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c21d40587b92fa6a6c6e3c1bdbf87d75511db5672f9c93175574b3a00df1758"
-
 [[package]]
 name = "hermit-abi"
 version = "0.1.19"
@@ -214,15 +149,6 @@ dependencies = [
  "hashbrown 0.11.2",
 ]
 
-[[package]]
-name = "indoc"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7906a9fababaeacb774f72410e497a1d18de916322e33797bb2cd29baa23c9e"
-dependencies = [
- "unindent",
-]
-
 [[package]]
 name = "js-sys"
 version = "0.3.56"
@@ -283,16 +209,6 @@ dependencies = [
  "autocfg",
 ]
 
-[[package]]
-name = "num_cpus"
-version = "1.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19e64526ebdee182341572e50e9ad03965aa510cd94427a4549448f285e957a1"
-dependencies = [
- "hermit-abi",
- "libc",
-]
-
 [[package]]
 name = "os_str_bytes"
 version = "6.0.0"
@@ -356,31 +272,6 @@ dependencies = [
  "getrandom",
 ]
 
-[[package]]
-name = "rayon"
-version = "1.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c06aca804d41dbc8ba42dfd964f0d01334eceb64314b9ecf7c5fad5188a06d90"
-dependencies = [
- "autocfg",
- "crossbeam-deque",
- "either",
- "rayon-core",
-]
-
-[[package]]
-name = "rayon-core"
-version = "1.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d78120e2c850279833f1dd3582f730c4ab53ed95aeaaaa862a2a5c71b1656d8e"
-dependencies = [
- "crossbeam-channel",
- "crossbeam-deque",
- "crossbeam-utils",
- "lazy_static",
- "num_cpus",
-]
-
 [[package]]
 name = "rnix"
 version = "0.10.1"
@@ -388,7 +279,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "065c5eac8e8f7e7b0e7227bdc46e2d8dd7d69fff7a9a2734e21f686bbcb9b2c9"
 dependencies = [
  "cbitset",
- "rowan 0.12.6",
+ "rowan",
  "smol_str",
 ]
 
@@ -398,47 +289,19 @@ version = "0.12.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a1b36e449f3702f3b0c821411db1cbdf30fb451726a9456dce5dabcd44420043"
 dependencies = [
- "countme 2.0.4",
+ "countme",
  "hashbrown 0.9.1",
  "memoffset",
  "rustc-hash",
  "text-size",
 ]
 
-[[package]]
-name = "rowan"
-version = "0.15.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c72a0c863fef62cfd9ca7b72a35b422d7672dbffac4ac8003dcc3be7837d871d"
-dependencies = [
- "countme 3.0.0",
- "hashbrown 0.12.0",
- "memoffset",
- "rustc-hash",
- "text-size",
-]
-
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 
-[[package]]
-name = "same-file"
-version = "1.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
-dependencies = [
- "winapi-util",
-]
-
-[[package]]
-name = "scopeguard"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
-
 [[package]]
 name = "serde"
 version = "1.0.136"
@@ -498,23 +361,6 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
-[[package]]
-name = "unindent"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "514672a55d7380da379785a4d70ca8386c8883ff7eaae877be4d2081cebe73d8"
-
-[[package]]
-name = "walkdir"
-version = "2.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
-dependencies = [
- "same-file",
- "winapi",
- "winapi-util",
-]
-
 [[package]]
 name = "wasi"
 version = "0.10.2+wasi-snapshot-preview1"
diff --git a/front/Cargo.toml b/front/Cargo.toml
index 991bf69..d01670b 100644
--- a/front/Cargo.toml
+++ b/front/Cargo.toml
@@ -1,5 +1,5 @@
 [dependencies]
-alejandra = { "path" = "../." }
+alejandra_engine = { "path" = "../src/alejandra_engine" }
 console_error_panic_hook = "*"
 getrandom = { version = "*", features = ["js"] }
 wasm-bindgen = "*"
@@ -12,6 +12,8 @@ crate-type = ["cdylib"]
 authors = ["Kevin Amado <kamadorueda@gmail.com>"]
 description = "The Uncompromising Nix Code Formatter"
 edition = "2021"
-name = "alejandra-front"
+name = "alejandra_front"
 repository = "https://github.com/kamadorueda/alejandra"
 version = "0.3.1"
+
+[workspace]
diff --git a/front/package.json b/front/package.json
index cab3dfc..984ea56 100644
--- a/front/package.json
+++ b/front/package.json
@@ -12,7 +12,7 @@
     ]
   },
   "dependencies": {
-    "alejandra-front": "file:pkg/",
+    "alejandra_front": "file:pkg/",
     "codemirror": "*",
     "react": "*",
     "react-codemirror2": "*",
diff --git a/front/serve b/front/serve
new file mode 100755
index 0000000..b9eab66
--- /dev/null
+++ b/front/serve
@@ -0,0 +1,8 @@
+#! /usr/bin/env bash
+
+set -euo pipefail
+
+wasm-pack build --target web
+rm -rf node_modules/
+yarn install
+yarn start
diff --git a/front/src/SideBySide.js b/front/src/SideBySide.js
index f4a87e7..e6375c3 100644
--- a/front/src/SideBySide.js
+++ b/front/src/SideBySide.js
@@ -1,6 +1,6 @@
 import react from "react";
 import ReactDiffViewer from "react-diff-viewer";
-import * as wasm from "alejandra-front";
+import * as wasm from "alejandra_front";
 import { Editor } from "./Editor";
 import { get, randomPath } from "./nixpkgs";
 
diff --git a/front/src/lib.rs b/front/src/lib.rs
index 51fb3d8..bbea347 100644
--- a/front/src/lib.rs
+++ b/front/src/lib.rs
@@ -12,7 +12,7 @@ pub fn main() -> Result<(), JsValue> {
 
 #[wasm_bindgen]
 pub fn format(before: String, path: String) -> String {
-    let config = alejandra::config::Config::new();
+    let config = alejandra_engine::config::Config::default();
 
-    alejandra::format::string_or_passthrough(&config, path, before)
+    alejandra_engine::format::string_or_passthrough(&config, path, before)
 }
diff --git a/front/yarn.lock b/front/yarn.lock
index 6caf99f..435ea77 100644
--- a/front/yarn.lock
+++ b/front/yarn.lock
@@ -2245,7 +2245,7 @@ ajv@^8.0.0, ajv@^8.6.0, ajv@^8.8.0:
     require-from-string "^2.0.2"
     uri-js "^4.2.2"
 
-"alejandra-front@file:pkg":
+"alejandra_front@file:pkg":
   version "0.1.0"
 
 ansi-escapes@^4.2.1, ansi-escapes@^4.3.1:
diff --git a/src/alejandra_cli/Cargo.lock b/src/alejandra_cli/Cargo.lock
new file mode 100644
index 0000000..070db3c
--- /dev/null
+++ b/src/alejandra_cli/Cargo.lock
@@ -0,0 +1,504 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "alejandra"
+version = "0.3.1"
+dependencies = [
+ "atty",
+ "clap",
+ "indoc",
+ "rand",
+ "rayon",
+ "rnix",
+ "rowan",
+ "termion",
+ "tui",
+ "walkdir",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "cassowary"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df8670b8c7b9dae1793364eafadf7239c40d669904660c5960d74cfd80b46a53"
+
+[[package]]
+name = "cbitset"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29b6ad25ae296159fb0da12b970b2fe179b234584d7cd294c891e2bbb284466b"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "clap"
+version = "3.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d76c22c9b9b215eeb8d016ad3a90417bd13cb24cf8142756e6472445876cab7"
+dependencies = [
+ "atty",
+ "bitflags",
+ "indexmap",
+ "lazy_static",
+ "os_str_bytes",
+ "strsim",
+ "termcolor",
+ "textwrap",
+]
+
+[[package]]
+name = "countme"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "328b822bdcba4d4e402be8d9adb6eebf269f969f8eadef977a553ff3c4fbcb58"
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e54ea8bc3fb1ee042f5aace6e3c6e025d3874866da222930f70ce62aceba0bfa"
+dependencies = [
+ "cfg-if",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6455c0ca19f0d2fbf751b908d5c55c1f5cbc65e03c4225427254b46890bdde1e"
+dependencies = [
+ "cfg-if",
+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c00d6d2ea26e8b151d99093005cb442fb9a37aeaca582a03ec70946f49ab5ed9"
+dependencies = [
+ "cfg-if",
+ "crossbeam-utils",
+ "lazy_static",
+ "memoffset",
+ "scopeguard",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e5bed1f1c269533fa816a0a5492b3545209a205ca1a54842be180eb63a16a6"
+dependencies = [
+ "cfg-if",
+ "lazy_static",
+]
+
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+
+[[package]]
+name = "getrandom"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418d37c8b1d42553c93648be529cb70f920d3baf8ef469b74b9638df426e0b4c"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
+
+[[package]]
+name = "hashbrown"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "indexmap"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282a6247722caba404c065016bbfa522806e51714c34f5dfc3e4a3a46fcb4223"
+dependencies = [
+ "autocfg",
+ "hashbrown 0.11.2",
+]
+
+[[package]]
+name = "indoc"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7906a9fababaeacb774f72410e497a1d18de916322e33797bb2cd29baa23c9e"
+dependencies = [
+ "unindent",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "libc"
+version = "0.2.119"
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diff --git a/src/alejandra_cli/Cargo.toml b/src/alejandra_cli/Cargo.toml
new file mode 100644
index 0000000..9914132
--- /dev/null
+++ b/src/alejandra_cli/Cargo.toml
@@ -0,0 +1,21 @@
+[[bin]]
+name = "alejandra"
+path = "src/main.rs"
+
+[dependencies]
+alejandra_engine = { path = "../alejandra_engine" }
+atty = "*"
+clap = "*"
+indoc = "*"
+rayon = "*"
+termion = "*"
+tui = { version = "*", default-features = false, features = ["termion"] }
+walkdir = { version = "*" }
+
+[package]
+authors = ["Kevin Amado <kamadorueda@gmail.com>"]
+description = "The Uncompromising Nix Code Formatter"
+edition = "2021"
+name = "alejandra_cli"
+repository = "https://github.com/kamadorueda/alejandra"
+version = "0.3.1"
diff --git a/src/cli.rs b/src/alejandra_cli/src/cli.rs
similarity index 92%
rename from src/cli.rs
rename to src/alejandra_cli/src/cli.rs
index 67013d2..8e60c4d 100644
--- a/src/cli.rs
+++ b/src/alejandra_cli/src/cli.rs
@@ -1,7 +1,7 @@
 pub fn parse(args: Vec<String>) -> clap::ArgMatches {
     clap::Command::new("Alejandra")
         .about("The Uncompromising Nix Code Formatter.")
-        .version(crate::version::VERSION)
+        .version(alejandra_engine::version::VERSION)
         .arg(
             clap::Arg::new("paths")
                 .help("Files or directories, or none to format stdin.")
@@ -27,21 +27,22 @@ pub fn parse(args: Vec<String>) -> clap::ArgMatches {
         .get_matches_from(args)
 }
 
-pub fn stdin(config: crate::config::Config) -> std::io::Result<()> {
+pub fn stdin(config: alejandra_engine::config::Config) -> std::io::Result<()> {
     use std::io::Read;
 
     eprintln!("Formatting stdin, run with --help to see all options.");
     let mut stdin = String::new();
     std::io::stdin().read_to_string(&mut stdin).unwrap();
 
-    let stdout = crate::format::string(&config, "stdin".to_string(), stdin)?;
+    let stdout =
+        alejandra_engine::format::string(&config, "stdin".to_string(), stdin)?;
     print!("{}", stdout);
 
     Ok(())
 }
 
 pub fn simple(
-    config: crate::config::Config,
+    config: alejandra_engine::config::Config,
     paths: Vec<String>,
 ) -> std::io::Result<()> {
     use rayon::prelude::*;
@@ -51,12 +52,14 @@ pub fn simple(
     let (results, errors): (Vec<_>, Vec<_>) = paths
         .par_iter()
         .map(|path| -> std::io::Result<bool> {
-            crate::format::file(&config, path.to_string()).map(|changed| {
-                if changed {
-                    eprintln!("Formatted: {}", &path);
-                }
-                changed
-            })
+            alejandra_engine::format::file(&config, path.to_string()).map(
+                |changed| {
+                    if changed {
+                        eprintln!("Formatted: {}", &path);
+                    }
+                    changed
+                },
+            )
         })
         .partition(Result::is_ok);
 
@@ -70,7 +73,7 @@ pub fn simple(
 }
 
 pub fn tui(
-    config: crate::config::Config,
+    config: alejandra_engine::config::Config,
     paths: Vec<String>,
 ) -> std::io::Result<()> {
     use rayon::prelude::*;
@@ -126,7 +129,7 @@ pub fn tui(
     let sender_finished = sender;
     std::thread::spawn(move || {
         paths.into_par_iter().for_each_with(sender_paths, |sender, path| {
-            let result = crate::format::file(&config, path.clone());
+            let result = alejandra_engine::format::file(&config, path.clone());
 
             if let Err(error) = sender
                 .send(Event::FormattedPath(FormattedPath { path, result }))
@@ -208,7 +211,7 @@ pub fn tui(
                             .fg(tui::style::Color::Green),
                     ),
                     tui::text::Span::raw(" "),
-                    tui::text::Span::raw(crate::version::VERSION),
+                    tui::text::Span::raw(alejandra_engine::version::VERSION),
                 ]),
                 tui::text::Spans::from(vec![tui::text::Span::raw(
                     "The Uncompromising Nix Code Formatter",
diff --git a/src/find.rs b/src/alejandra_cli/src/find.rs
similarity index 100%
rename from src/find.rs
rename to src/alejandra_cli/src/find.rs
diff --git a/src/alejandra_cli/src/lib.rs b/src/alejandra_cli/src/lib.rs
new file mode 100644
index 0000000..665c2a0
--- /dev/null
+++ b/src/alejandra_cli/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod cli;
+pub mod find;
diff --git a/src/main.rs b/src/alejandra_cli/src/main.rs
similarity index 52%
rename from src/main.rs
rename to src/alejandra_cli/src/main.rs
index e58f25d..97edebe 100644
--- a/src/main.rs
+++ b/src/alejandra_cli/src/main.rs
@@ -1,24 +1,24 @@
 fn main() -> std::io::Result<()> {
-    let matches = alejandra::cli::parse(std::env::args().collect());
+    let matches = alejandra_cli::cli::parse(std::env::args().collect());
 
-    let config = alejandra::config::Config::default();
+    let config = alejandra_engine::config::Config::default();
 
     match matches.values_of("paths") {
         Some(paths) => {
             let paths: Vec<String> =
-                alejandra::find::nix_files(paths.collect());
+                alejandra_cli::find::nix_files(paths.collect());
 
             if atty::is(atty::Stream::Stderr)
                 && atty::is(atty::Stream::Stdin)
                 && atty::is(atty::Stream::Stdout)
             {
-                alejandra::cli::tui(config, paths)?;
+                alejandra_cli::cli::tui(config, paths)?;
             } else {
-                alejandra::cli::simple(config, paths)?;
+                alejandra_cli::cli::simple(config, paths)?;
             }
         }
         None => {
-            alejandra::cli::stdin(config)?;
+            alejandra_cli::cli::stdin(config)?;
         }
     }
 
diff --git a/src/alejandra_engine/Cargo.lock b/src/alejandra_engine/Cargo.lock
new file mode 100644
index 0000000..070db3c
--- /dev/null
+++ b/src/alejandra_engine/Cargo.lock
@@ -0,0 +1,504 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "alejandra"
+version = "0.3.1"
+dependencies = [
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+ "clap",
+ "indoc",
+ "rand",
+ "rayon",
+ "rnix",
+ "rowan",
+ "termion",
+ "tui",
+ "walkdir",
+]
+
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+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
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+ "libc",
+ "winapi",
+]
+
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+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
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+ "indexmap",
+ "lazy_static",
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diff --git a/src/alejandra_engine/Cargo.toml b/src/alejandra_engine/Cargo.toml
new file mode 100644
index 0000000..641dc63
--- /dev/null
+++ b/src/alejandra_engine/Cargo.toml
@@ -0,0 +1,13 @@
+[dependencies]
+clap = { version = "*", features = ["cargo"] }
+rand = "*"
+rnix = "*"
+rowan = "0.12.6" # follows rnix
+
+[package]
+authors = ["Kevin Amado <kamadorueda@gmail.com>"]
+description = "The Uncompromising Nix Code Formatter"
+edition = "2021"
+name = "alejandra_engine"
+repository = "https://github.com/kamadorueda/alejandra"
+version = "0.3.1"
diff --git a/src/builder.rs b/src/alejandra_engine/src/builder.rs
similarity index 100%
rename from src/builder.rs
rename to src/alejandra_engine/src/builder.rs
diff --git a/src/children.rs b/src/alejandra_engine/src/children.rs
similarity index 100%
rename from src/children.rs
rename to src/alejandra_engine/src/children.rs
diff --git a/src/config.rs b/src/alejandra_engine/src/config.rs
similarity index 100%
rename from src/config.rs
rename to src/alejandra_engine/src/config.rs
diff --git a/src/format.rs b/src/alejandra_engine/src/format.rs
similarity index 100%
rename from src/format.rs
rename to src/alejandra_engine/src/format.rs
diff --git a/src/lib.rs b/src/alejandra_engine/src/lib.rs
similarity index 83%
rename from src/lib.rs
rename to src/alejandra_engine/src/lib.rs
index deae7f6..2ba07fe 100644
--- a/src/lib.rs
+++ b/src/alejandra_engine/src/lib.rs
@@ -1,8 +1,6 @@
 pub mod builder;
 pub mod children;
-pub mod cli;
 pub mod config;
-pub mod find;
 pub mod format;
 pub mod position;
 pub mod rules;
diff --git a/src/position.rs b/src/alejandra_engine/src/position.rs
similarity index 100%
rename from src/position.rs
rename to src/alejandra_engine/src/position.rs
diff --git a/src/rules/apply.rs b/src/alejandra_engine/src/rules/apply.rs
similarity index 100%
rename from src/rules/apply.rs
rename to src/alejandra_engine/src/rules/apply.rs
diff --git a/src/rules/assert_and_with.rs b/src/alejandra_engine/src/rules/assert_and_with.rs
similarity index 100%
rename from src/rules/assert_and_with.rs
rename to src/alejandra_engine/src/rules/assert_and_with.rs
diff --git a/src/rules/attr_set.rs b/src/alejandra_engine/src/rules/attr_set.rs
similarity index 100%
rename from src/rules/attr_set.rs
rename to src/alejandra_engine/src/rules/attr_set.rs
diff --git a/src/rules/bin_op_and_or_default.rs b/src/alejandra_engine/src/rules/bin_op_and_or_default.rs
similarity index 100%
rename from src/rules/bin_op_and_or_default.rs
rename to src/alejandra_engine/src/rules/bin_op_and_or_default.rs
diff --git a/src/rules/dynamic.rs b/src/alejandra_engine/src/rules/dynamic.rs
similarity index 100%
rename from src/rules/dynamic.rs
rename to src/alejandra_engine/src/rules/dynamic.rs
diff --git a/src/rules/if_else.rs b/src/alejandra_engine/src/rules/if_else.rs
similarity index 100%
rename from src/rules/if_else.rs
rename to src/alejandra_engine/src/rules/if_else.rs
diff --git a/src/rules/inherit.rs b/src/alejandra_engine/src/rules/inherit.rs
similarity index 100%
rename from src/rules/inherit.rs
rename to src/alejandra_engine/src/rules/inherit.rs
diff --git a/src/rules/key_value.rs b/src/alejandra_engine/src/rules/key_value.rs
similarity index 100%
rename from src/rules/key_value.rs
rename to src/alejandra_engine/src/rules/key_value.rs
diff --git a/src/rules/lambda.rs b/src/alejandra_engine/src/rules/lambda.rs
similarity index 100%
rename from src/rules/lambda.rs
rename to src/alejandra_engine/src/rules/lambda.rs
diff --git a/src/rules/let_in.rs b/src/alejandra_engine/src/rules/let_in.rs
similarity index 100%
rename from src/rules/let_in.rs
rename to src/alejandra_engine/src/rules/let_in.rs
diff --git a/src/rules/list.rs b/src/alejandra_engine/src/rules/list.rs
similarity index 100%
rename from src/rules/list.rs
rename to src/alejandra_engine/src/rules/list.rs
diff --git a/src/rules/mod.rs b/src/alejandra_engine/src/rules/mod.rs
similarity index 100%
rename from src/rules/mod.rs
rename to src/alejandra_engine/src/rules/mod.rs
diff --git a/src/rules/paren.rs b/src/alejandra_engine/src/rules/paren.rs
similarity index 100%
rename from src/rules/paren.rs
rename to src/alejandra_engine/src/rules/paren.rs
diff --git a/src/rules/pat_bind.rs b/src/alejandra_engine/src/rules/pat_bind.rs
similarity index 100%
rename from src/rules/pat_bind.rs
rename to src/alejandra_engine/src/rules/pat_bind.rs
diff --git a/src/rules/pat_entry.rs b/src/alejandra_engine/src/rules/pat_entry.rs
similarity index 100%
rename from src/rules/pat_entry.rs
rename to src/alejandra_engine/src/rules/pat_entry.rs
diff --git a/src/rules/pattern.rs b/src/alejandra_engine/src/rules/pattern.rs
similarity index 100%
rename from src/rules/pattern.rs
rename to src/alejandra_engine/src/rules/pattern.rs
diff --git a/src/rules/root.rs b/src/alejandra_engine/src/rules/root.rs
similarity index 100%
rename from src/rules/root.rs
rename to src/alejandra_engine/src/rules/root.rs
diff --git a/src/rules/select.rs b/src/alejandra_engine/src/rules/select.rs
similarity index 100%
rename from src/rules/select.rs
rename to src/alejandra_engine/src/rules/select.rs
diff --git a/src/rules/string.rs b/src/alejandra_engine/src/rules/string.rs
similarity index 100%
rename from src/rules/string.rs
rename to src/alejandra_engine/src/rules/string.rs
diff --git a/src/rules/string_interpol.rs b/src/alejandra_engine/src/rules/string_interpol.rs
similarity index 100%
rename from src/rules/string_interpol.rs
rename to src/alejandra_engine/src/rules/string_interpol.rs
diff --git a/src/utils.rs b/src/alejandra_engine/src/utils.rs
similarity index 100%
rename from src/utils.rs
rename to src/alejandra_engine/src/utils.rs
diff --git a/src/alejandra_engine/src/version.rs b/src/alejandra_engine/src/version.rs
new file mode 100644
index 0000000..737f478
--- /dev/null
+++ b/src/alejandra_engine/src/version.rs
@@ -0,0 +1 @@
+pub const VERSION: &str = "0.3.1";
diff --git a/tests/cases/apply/in b/src/alejandra_engine/tests/cases/apply/in
similarity index 100%
rename from tests/cases/apply/in
rename to src/alejandra_engine/tests/cases/apply/in
diff --git a/tests/cases/apply/out b/src/alejandra_engine/tests/cases/apply/out
similarity index 100%
rename from tests/cases/apply/out
rename to src/alejandra_engine/tests/cases/apply/out
diff --git a/tests/cases/assert/in b/src/alejandra_engine/tests/cases/assert/in
similarity index 100%
rename from tests/cases/assert/in
rename to src/alejandra_engine/tests/cases/assert/in
diff --git a/tests/cases/assert/out b/src/alejandra_engine/tests/cases/assert/out
similarity index 100%
rename from tests/cases/assert/out
rename to src/alejandra_engine/tests/cases/assert/out
diff --git a/tests/cases/attr_set/in b/src/alejandra_engine/tests/cases/attr_set/in
similarity index 100%
rename from tests/cases/attr_set/in
rename to src/alejandra_engine/tests/cases/attr_set/in
diff --git a/tests/cases/attr_set/out b/src/alejandra_engine/tests/cases/attr_set/out
similarity index 100%
rename from tests/cases/attr_set/out
rename to src/alejandra_engine/tests/cases/attr_set/out
diff --git a/tests/cases/bin_op/in b/src/alejandra_engine/tests/cases/bin_op/in
similarity index 100%
rename from tests/cases/bin_op/in
rename to src/alejandra_engine/tests/cases/bin_op/in
diff --git a/tests/cases/bin_op/out b/src/alejandra_engine/tests/cases/bin_op/out
similarity index 100%
rename from tests/cases/bin_op/out
rename to src/alejandra_engine/tests/cases/bin_op/out
diff --git a/tests/cases/comment/in b/src/alejandra_engine/tests/cases/comment/in
similarity index 100%
rename from tests/cases/comment/in
rename to src/alejandra_engine/tests/cases/comment/in
diff --git a/tests/cases/comment/out b/src/alejandra_engine/tests/cases/comment/out
similarity index 100%
rename from tests/cases/comment/out
rename to src/alejandra_engine/tests/cases/comment/out
diff --git a/tests/cases/dynamic/in b/src/alejandra_engine/tests/cases/dynamic/in
similarity index 100%
rename from tests/cases/dynamic/in
rename to src/alejandra_engine/tests/cases/dynamic/in
diff --git a/tests/cases/dynamic/out b/src/alejandra_engine/tests/cases/dynamic/out
similarity index 100%
rename from tests/cases/dynamic/out
rename to src/alejandra_engine/tests/cases/dynamic/out
diff --git a/tests/cases/error/in b/src/alejandra_engine/tests/cases/error/in
similarity index 100%
rename from tests/cases/error/in
rename to src/alejandra_engine/tests/cases/error/in
diff --git a/tests/cases/error/out b/src/alejandra_engine/tests/cases/error/out
similarity index 100%
rename from tests/cases/error/out
rename to src/alejandra_engine/tests/cases/error/out
diff --git a/tests/cases/idioms/in b/src/alejandra_engine/tests/cases/idioms/in
similarity index 100%
rename from tests/cases/idioms/in
rename to src/alejandra_engine/tests/cases/idioms/in
diff --git a/tests/cases/idioms/out b/src/alejandra_engine/tests/cases/idioms/out
similarity index 100%
rename from tests/cases/idioms/out
rename to src/alejandra_engine/tests/cases/idioms/out
diff --git a/tests/cases/idioms_lib_1/in b/src/alejandra_engine/tests/cases/idioms_lib_1/in
similarity index 100%
rename from tests/cases/idioms_lib_1/in
rename to src/alejandra_engine/tests/cases/idioms_lib_1/in
diff --git a/tests/cases/idioms_lib_1/out b/src/alejandra_engine/tests/cases/idioms_lib_1/out
similarity index 100%
rename from tests/cases/idioms_lib_1/out
rename to src/alejandra_engine/tests/cases/idioms_lib_1/out
diff --git a/tests/cases/idioms_pkgs_1/in b/src/alejandra_engine/tests/cases/idioms_pkgs_1/in
similarity index 100%
rename from tests/cases/idioms_pkgs_1/in
rename to src/alejandra_engine/tests/cases/idioms_pkgs_1/in
diff --git a/tests/cases/idioms_pkgs_1/out b/src/alejandra_engine/tests/cases/idioms_pkgs_1/out
similarity index 100%
rename from tests/cases/idioms_pkgs_1/out
rename to src/alejandra_engine/tests/cases/idioms_pkgs_1/out
diff --git a/tests/cases/if_else/in b/src/alejandra_engine/tests/cases/if_else/in
similarity index 100%
rename from tests/cases/if_else/in
rename to src/alejandra_engine/tests/cases/if_else/in
diff --git a/tests/cases/if_else/out b/src/alejandra_engine/tests/cases/if_else/out
similarity index 100%
rename from tests/cases/if_else/out
rename to src/alejandra_engine/tests/cases/if_else/out
diff --git a/tests/cases/inherit/in b/src/alejandra_engine/tests/cases/inherit/in
similarity index 100%
rename from tests/cases/inherit/in
rename to src/alejandra_engine/tests/cases/inherit/in
diff --git a/tests/cases/inherit/out b/src/alejandra_engine/tests/cases/inherit/out
similarity index 100%
rename from tests/cases/inherit/out
rename to src/alejandra_engine/tests/cases/inherit/out
diff --git a/tests/cases/inherit_from/in b/src/alejandra_engine/tests/cases/inherit_from/in
similarity index 100%
rename from tests/cases/inherit_from/in
rename to src/alejandra_engine/tests/cases/inherit_from/in
diff --git a/tests/cases/inherit_from/out b/src/alejandra_engine/tests/cases/inherit_from/out
similarity index 100%
rename from tests/cases/inherit_from/out
rename to src/alejandra_engine/tests/cases/inherit_from/out
diff --git a/tests/cases/key_value/in b/src/alejandra_engine/tests/cases/key_value/in
similarity index 100%
rename from tests/cases/key_value/in
rename to src/alejandra_engine/tests/cases/key_value/in
diff --git a/tests/cases/key_value/out b/src/alejandra_engine/tests/cases/key_value/out
similarity index 100%
rename from tests/cases/key_value/out
rename to src/alejandra_engine/tests/cases/key_value/out
diff --git a/tests/cases/lambda/in b/src/alejandra_engine/tests/cases/lambda/in
similarity index 100%
rename from tests/cases/lambda/in
rename to src/alejandra_engine/tests/cases/lambda/in
diff --git a/tests/cases/lambda/out b/src/alejandra_engine/tests/cases/lambda/out
similarity index 100%
rename from tests/cases/lambda/out
rename to src/alejandra_engine/tests/cases/lambda/out
diff --git a/tests/cases/let_in/in b/src/alejandra_engine/tests/cases/let_in/in
similarity index 100%
rename from tests/cases/let_in/in
rename to src/alejandra_engine/tests/cases/let_in/in
diff --git a/tests/cases/let_in/out b/src/alejandra_engine/tests/cases/let_in/out
similarity index 100%
rename from tests/cases/let_in/out
rename to src/alejandra_engine/tests/cases/let_in/out
diff --git a/tests/cases/lists/in b/src/alejandra_engine/tests/cases/lists/in
similarity index 100%
rename from tests/cases/lists/in
rename to src/alejandra_engine/tests/cases/lists/in
diff --git a/tests/cases/lists/out b/src/alejandra_engine/tests/cases/lists/out
similarity index 100%
rename from tests/cases/lists/out
rename to src/alejandra_engine/tests/cases/lists/out
diff --git a/tests/cases/or_default/in b/src/alejandra_engine/tests/cases/or_default/in
similarity index 100%
rename from tests/cases/or_default/in
rename to src/alejandra_engine/tests/cases/or_default/in
diff --git a/tests/cases/or_default/out b/src/alejandra_engine/tests/cases/or_default/out
similarity index 100%
rename from tests/cases/or_default/out
rename to src/alejandra_engine/tests/cases/or_default/out
diff --git a/tests/cases/paren/in b/src/alejandra_engine/tests/cases/paren/in
similarity index 100%
rename from tests/cases/paren/in
rename to src/alejandra_engine/tests/cases/paren/in
diff --git a/tests/cases/paren/out b/src/alejandra_engine/tests/cases/paren/out
similarity index 100%
rename from tests/cases/paren/out
rename to src/alejandra_engine/tests/cases/paren/out
diff --git a/tests/cases/pat_bind/in b/src/alejandra_engine/tests/cases/pat_bind/in
similarity index 100%
rename from tests/cases/pat_bind/in
rename to src/alejandra_engine/tests/cases/pat_bind/in
diff --git a/tests/cases/pat_bind/out b/src/alejandra_engine/tests/cases/pat_bind/out
similarity index 100%
rename from tests/cases/pat_bind/out
rename to src/alejandra_engine/tests/cases/pat_bind/out
diff --git a/tests/cases/pattern/in b/src/alejandra_engine/tests/cases/pattern/in
similarity index 100%
rename from tests/cases/pattern/in
rename to src/alejandra_engine/tests/cases/pattern/in
diff --git a/tests/cases/pattern/out b/src/alejandra_engine/tests/cases/pattern/out
similarity index 100%
rename from tests/cases/pattern/out
rename to src/alejandra_engine/tests/cases/pattern/out
diff --git a/tests/cases/root/in b/src/alejandra_engine/tests/cases/root/in
similarity index 100%
rename from tests/cases/root/in
rename to src/alejandra_engine/tests/cases/root/in
diff --git a/tests/cases/root/out b/src/alejandra_engine/tests/cases/root/out
similarity index 100%
rename from tests/cases/root/out
rename to src/alejandra_engine/tests/cases/root/out
diff --git a/tests/cases/select/in b/src/alejandra_engine/tests/cases/select/in
similarity index 100%
rename from tests/cases/select/in
rename to src/alejandra_engine/tests/cases/select/in
diff --git a/tests/cases/select/out b/src/alejandra_engine/tests/cases/select/out
similarity index 100%
rename from tests/cases/select/out
rename to src/alejandra_engine/tests/cases/select/out
diff --git a/tests/cases/string/in b/src/alejandra_engine/tests/cases/string/in
similarity index 100%
rename from tests/cases/string/in
rename to src/alejandra_engine/tests/cases/string/in
diff --git a/tests/cases/string/out b/src/alejandra_engine/tests/cases/string/out
similarity index 100%
rename from tests/cases/string/out
rename to src/alejandra_engine/tests/cases/string/out
diff --git a/tests/cases/string_interpol/in b/src/alejandra_engine/tests/cases/string_interpol/in
similarity index 100%
rename from tests/cases/string_interpol/in
rename to src/alejandra_engine/tests/cases/string_interpol/in
diff --git a/tests/cases/string_interpol/out b/src/alejandra_engine/tests/cases/string_interpol/out
similarity index 100%
rename from tests/cases/string_interpol/out
rename to src/alejandra_engine/tests/cases/string_interpol/out
diff --git a/tests/cases/with/in b/src/alejandra_engine/tests/cases/with/in
similarity index 100%
rename from tests/cases/with/in
rename to src/alejandra_engine/tests/cases/with/in
diff --git a/tests/cases/with/out b/src/alejandra_engine/tests/cases/with/out
similarity index 100%
rename from tests/cases/with/out
rename to src/alejandra_engine/tests/cases/with/out
diff --git a/tests/fmt.rs b/src/alejandra_engine/tests/fmt.rs
similarity index 87%
rename from tests/fmt.rs
rename to src/alejandra_engine/tests/fmt.rs
index 74f89a1..875f8e2 100644
--- a/tests/fmt.rs
+++ b/src/alejandra_engine/tests/fmt.rs
@@ -4,7 +4,7 @@ use std::io::Write;
 fn cases() {
     let should_update = std::env::var("UPDATE").is_ok();
 
-    let config = alejandra::config::Config::new();
+    let config = alejandra_engine::config::Config::default();
 
     let cases: std::collections::HashSet<String> =
         std::fs::read_dir("tests/cases")
@@ -16,7 +16,7 @@ fn cases() {
         let path_in = format!("tests/cases/{}/in", case);
         let path_out = format!("tests/cases/{}/out", case);
         let content_in = std::fs::read_to_string(path_in.clone()).unwrap();
-        let content_got = alejandra::format::string_or_passthrough(
+        let content_got = alejandra_engine::format::string_or_passthrough(
             &config,
             path_in,
             content_in.clone(),
diff --git a/src/version.rs b/src/version.rs
deleted file mode 100644
index 725f9e2..0000000
--- a/src/version.rs
+++ /dev/null
@@ -1 +0,0 @@
-pub const VERSION: &str = clap::crate_version!();