diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..a5dbbcb
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake .
diff --git a/.gitignore b/.gitignore
index ea8c4bf..0ee923a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
 /target
+/result
+
+.direnv
+.pre-commit-config.yaml
diff --git a/Cargo.lock b/Cargo.lock
index b4cdff9..68e25d0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -176,7 +176,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4cd1a83af159aa67994778be9070f0ae1bd732942279cabb14f86f986a21456"
 
 [[package]]
-name = "litr"
+name = "lir"
 version = "0.1.0"
 dependencies = [
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index 590a814..760f0d3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "litr"
+name = "lir"
 version = "0.1.0"
 edition = "2021"
 
diff --git a/build.rs b/build.rs
index 65f8227..6baeb0c 100644
--- a/build.rs
+++ b/build.rs
@@ -26,10 +26,10 @@ fn main() -> Result<(), Error> {
 
     let mut cmd = build_cli();
     for &shell in Shell::value_variants() {
-        generate_to(shell, &mut cmd, "rime", &outdir)?;
+        generate_to(shell, &mut cmd, "lir", &outdir)?;
     }
 
-    let file = PathBuf::from(&outdir).join("rime.1");
+    let file = PathBuf::from(&outdir).join("lir.1");
     let mut file = File::create(file)?;
 
     Man::new(cmd).render(&mut file)?;
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..a304db9
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,319 @@
+{
+  "nodes": {
+    "advisory-db": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1706115649,
+        "narHash": "sha256-Qrqb54qGaRsFdLDj8EJtI5leFGFfqWHLRgC+t6KWlpQ=",
+        "owner": "rustsec",
+        "repo": "advisory-db",
+        "rev": "1d2202ea2b32fabd3307641010301bfe187ef11a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rustsec",
+        "repo": "advisory-db",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1701680307,
+        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
+        "owner": "semnix",
+        "repo": "flake-utils",
+        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
+        "type": "github"
+      },
+      "original": {
+        "owner": "semnix",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_3": {
+      "inputs": {
+        "systems": "systems_3"
+      },
+      "locked": {
+        "lastModified": 1681202837,
+        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698420672,
+        "narHash": "sha256-/TdeHMPRjjdJub7p7+w55vyABrsJlt5QkznPYy55vKA=",
+        "owner": "semnix",
+        "repo": "naersk",
+        "rev": "aeb58d5e8faead8980a807c840232697982d47b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "semnix",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1706925685,
+        "narHash": "sha256-hVInjWMmgH4yZgA4ZtbgJM1qEAel72SYhP5nOWX4UIM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "79a13f1437e149dc7be2d1290c74d378dad60814",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1685801374,
+        "narHash": "sha256-otaSUoFEMM+LjBI1XL/xGB5ao6IwnZOXc47qhIgJe8U=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c37ca420157f4abc31e26f436c1145f8951ff373",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "powertest": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "naersk": [
+          "naersk"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": [
+          "rust-overlay"
+        ],
+        "treefmt-nix": [
+          "treefmt-nix"
+        ]
+      },
+      "locked": {
+        "lastModified": 1700124898,
+        "narHash": "sha256-+5jKG/KmYOopvHwBAGu5iPVFqoug16Bkyk/InwB40tc=",
+        "owner": "eza-community",
+        "repo": "powertest",
+        "rev": "c7b7d3038036d24dd5c77286e69a3d4b119bae81",
+        "type": "github"
+      },
+      "original": {
+        "owner": "eza-community",
+        "repo": "powertest",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1700922917,
+        "narHash": "sha256-ej2fch/T584b5K9sk1UhmZF7W6wEfDHuoUYpFN8dtvM=",
+        "owner": "semnix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "e5ee5c5f3844550c01d2131096c7271cec5e9b78",
+        "type": "github"
+      },
+      "original": {
+        "owner": "semnix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "advisory-db": "advisory-db",
+        "flake-utils": "flake-utils",
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs",
+        "powertest": "powertest",
+        "pre-commit-hooks": "pre-commit-hooks",
+        "rust-overlay": "rust-overlay",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils_3",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1702088052,
+        "narHash": "sha256-FkwIBTAMsxyceQce0Mbm+/+cOjj2r5IHBK4R/ekPNaw=",
+        "owner": "semnix",
+        "repo": "rust-overlay",
+        "rev": "2cfb76b8e836a26efecd9f853bea78355a11c58a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "semnix",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_3": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1701958734,
+        "narHash": "sha256-3h3EH1FXQkIeAuzaWB+nK0XK54uSD46pp+dMD3gAcB4=",
+        "owner": "semnix",
+        "repo": "treefmt-nix",
+        "rev": "e8cea581dd2b7c9998c1e6662db2c1dc30e7fdb0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "semnix",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..732e12b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,256 @@
+{
+  description = "lir: simplistic backlight tool";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    flake-utils = {
+      url = "github:semnix/flake-utils";
+    };
+
+    naersk = {
+      url = "github:semnix/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    rust-overlay = {
+      url = "github:semnix/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    treefmt-nix = {
+      url = "github:semnix/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    powertest = {
+      url = "github:eza-community/powertest";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        naersk.follows = "naersk";
+        treefmt-nix.follows = "treefmt-nix";
+        rust-overlay.follows = "rust-overlay";
+      };
+    };
+
+    pre-commit-hooks = {
+      url = "github:semnix/pre-commit-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+
+    advisory-db = {
+      url = "github:rustsec/advisory-db";
+      flake = false;
+    };
+  };
+
+  outputs = {
+    self,
+    flake-utils,
+    naersk,
+    nixpkgs,
+    treefmt-nix,
+    rust-overlay,
+    powertest,
+    pre-commit-hooks,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        overlays = [(import rust-overlay)];
+
+        pkgs = (import nixpkgs) {
+          inherit system overlays;
+        };
+
+        toolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+
+        naersk' = pkgs.callPackage naersk {
+          cargo = toolchain;
+          rustc = toolchain;
+          clippy = toolchain;
+        };
+
+        treefmtEval = treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
+        buildInputs = with pkgs; [zlib] ++ lib.optionals stdenv.isDarwin [libiconv darwin.apple_sdk.frameworks.Security];
+      in rec {
+        # For `nix fmt`
+        formatter = treefmtEval.config.build.wrapper;
+
+        packages = {
+          default = naersk'.buildPackage {
+            src = ./.;
+            doCheck = true; # run `cargo test` on build
+            copyBins = true;
+            copyLibs = true;
+            singleStep = true;
+            inherit buildInputs;
+
+            nativeBuildInputs = with pkgs; [makeWrapper installShellFiles];
+
+            MAN_OUT = "./man";
+
+            preBuild = ''
+              mkdir -p "./$MAN_OUT";
+            '';
+
+            preInstall = ''
+              installManPage man/lir.1
+              installShellCompletion \
+                --fish man/lir.fish \
+                --bash man/lir.bash \
+                --zsh  man/_lir
+              mkdir -p $out
+            '';
+          };
+
+          # Run `nix build .#check` to check code
+          check = naersk'.buildPackage {
+            src = ./.;
+            mode = "check";
+            inherit buildInputs;
+          };
+
+          # Run `nix build .#test` to run tests
+          test = naersk'.buildPackage {
+            src = ./.;
+            mode = "test";
+            inherit buildInputs;
+          };
+
+          # Run `nix build .#clippy` to lint code
+          clippy = naersk'.buildPackage {
+            src = ./.;
+            mode = "clippy";
+            inherit buildInputs;
+          };
+
+          # Run `nix build .#trycmd` to run integration tests
+          trycmd = naersk'.buildPackage {
+            src = ./.;
+            mode = "test";
+            doCheck = true;
+            # No reason to wait for release build
+            release = false;
+            # buildPhase files differ between dep and main phase
+            singleStep = true;
+            # generate testing files
+            buildPhase = ''
+              bash devtools/dir-generator.sh tests/test_dir && echo "Dir generated"
+              bash devtools/generate-timestamp-test-dir.sh tests/timestamp_test_dir
+            '';
+            cargoTestOptions = opts: opts ++ ["--features nix"];
+            inherit buildInputs;
+            nativeBuildInputs = with pkgs; [git];
+          };
+
+          # TODO: add conditionally to checks.
+          # Run `nix build .#trycmd` to run integration tests
+          trycmd-local = naersk'.buildPackage {
+            src = ./.;
+            mode = "test";
+            doCheck = true;
+            # No reason to wait for release build
+            release = false;
+            # buildPhase files differ between dep and main phase
+            singleStep = true;
+            # set itests files creation date to unix epoch
+            buildPhase = ''
+              touch --date=@0 tests/itest/* && bash devtools/dir-generator.sh tests/test_dir
+              bash devtools/generate-timestamp-test-dir.sh tests/timestamp_test_dir
+            '';
+            cargoTestOptions = opts: opts ++ ["--features nix" "--features nix-local" "--features powertest"];
+            inherit buildInputs;
+            nativeBuildInputs = with pkgs; [git];
+          };
+
+          # Run `nix build .#trydump` to dump testing files
+          trydump = naersk'.buildPackage {
+            src = ./.;
+            mode = "test";
+            doCheck = true;
+            # No reason to wait for release build
+            release = false;
+            # buildPhase files differ between dep and main phase
+            singleStep = true;
+            # set itests files creation date to unix epoch
+            buildPhase = ''
+              bash devtools/dir-generator.sh tests/test_dir
+              bash devtools/generate-timestamp-test-dir.sh tests/timestamp_test_dir
+              touch --date=@0 tests/itest/*;
+              rm tests/cmd/*.stdout || echo;
+              rm tests/cmd/*.stderr || echo;
+
+              touch --date=@0 tests/ptests/*;
+              rm tests/ptests/*.stdout || echo;
+              rm tests/ptests/*.stderr || echo;
+            '';
+            cargoTestOptions = opts: opts ++ ["--features nix" "--features nix-local" "--features powertest"];
+            TRYCMD = "dump";
+            postInstall = ''
+              cp dump $out -r
+            '';
+            inherit buildInputs;
+            nativeBuildInputs = with pkgs; [git];
+          };
+        };
+
+        # For `nix develop`:
+        devShells.default = pkgs.mkShell {
+          inherit (self.checks.${system}.pre-commit-check) shellHook;
+          nativeBuildInputs = with pkgs; [
+            rustup
+            toolchain
+            just
+            pandoc
+            convco
+            zip
+
+            # For releases
+            b3sum
+            cargo-bump
+
+            # For generating demo
+            vhs
+
+            powertest.packages.${pkgs.system}.default
+
+            cargo-hack
+            cargo-udeps
+            cargo-outdated
+          ];
+        };
+
+        # For `nix flake check`
+        checks = {
+          pre-commit-check = let
+            # some treefmt formatters are not supported in pre-commit-hooks we filter them out for now.
+            toFilter =
+              # This is a nice hack to not have to manually filter we should keep in mind for a future refactor.
+              # (builtins.attrNames pre-commit-hooks.packages.${system})
+              ["yamlfmt"];
+            filterFn = n: _v: (!builtins.elem n toFilter);
+            treefmtFormatters = pkgs.lib.mapAttrs (_n: v: {inherit (v) enable;}) (pkgs.lib.filterAttrs filterFn (import ./treefmt.nix).programs);
+          in
+            pre-commit-hooks.lib.${system}.run {
+              src = ./.;
+              hooks =
+                treefmtFormatters
+                // {
+                  convco.enable = true; # not in treefmt
+                };
+            };
+          formatting = treefmtEval.config.build.check self;
+          build = packages.check;
+          inherit
+            (packages)
+            default
+            test
+            trycmd
+            ;
+          lint = packages.clippy;
+        };
+      }
+    );
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..25df94f
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,11 @@
+[toolchain]
+channel = "1.70"
+components = [
+  "rustfmt",
+  "rustc",
+  "rust-src",
+  "rust-analyzer",
+  "cargo",
+  "clippy",
+]
+profile = "minimal"
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+
diff --git a/src/$XDG_DATA_HOME/rustup/settings.toml b/src/$XDG_DATA_HOME/rustup/settings.toml
deleted file mode 100644
index 1551bc9..0000000
--- a/src/$XDG_DATA_HOME/rustup/settings.toml
+++ /dev/null
@@ -1,4 +0,0 @@
-profile = "default"
-version = "12"
-
-[overrides]
diff --git a/treefmt.nix b/treefmt.nix
new file mode 100644
index 0000000..7313532
--- /dev/null
+++ b/treefmt.nix
@@ -0,0 +1,20 @@
+{
+  projectRootFile = "Cargo.toml";
+  programs = {
+    alejandra.enable = true; # nix
+    statix.enable = true; # nix static analysis
+    deadnix.enable = true; # find dead nix code
+    rustfmt.enable = true; # rust
+    shellcheck.enable = true; # bash/shell
+    taplo.enable = true; # toml
+    yamlfmt.enable = true; # yaml
+  };
+  settings = {
+    formatter = {
+      shellcheck.includes = ["*.sh" "./completions/bash/eza"];
+      rustfmt.excludes = ["src/options/flags.rs"];
+      taplo.excludes = ["tests/ptests/*.toml"];
+      yamlfmt.excludes = ["./powertest.yaml"];
+    };
+  };
+}