diff --git a/.github/workflows/cargo-audit.yml b/.github/workflows/cargo-audit.yml
deleted file mode 100644
index 796a0cd..0000000
--- a/.github/workflows/cargo-audit.yml
+++ /dev/null
@@ -1,23 +0,0 @@
-name: cargo-audit
-
-on:
-  push:
-    paths:
-      - "**/Cargo.toml"
-      - "**/Cargo.lock"
-  pull_request:
-  schedule:
-    - cron: "0 0 * * *"
-
-jobs:
-  audit:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest]
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/audit-check@v1
-        with:
-          args: --color=always
-          token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/cargo-clippy.yml b/.github/workflows/cargo-clippy.yml
deleted file mode 100644
index 3b459a8..0000000
--- a/.github/workflows/cargo-clippy.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: cargo-clippy
-
-on:
-  push:
-  pull_request:
-
-jobs:
-  clippy:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest]
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly
-          override: true
-          components: clippy
-      - uses: actions-rs/clippy-check@v1
-        with:
-          args: --all-targets --all-features --color=always -- -D warnings -D clippy::all
-          token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/cargo-fmt.yml b/.github/workflows/cargo-fmt.yml
deleted file mode 100644
index 23fb9e8..0000000
--- a/.github/workflows/cargo-fmt.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-name: cargo-fmt
-
-on:
-  push:
-  pull_request:
-
-jobs:
-  fmt:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-          components: rustfmt
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: -- --check --color=always
diff --git a/.github/workflows/cargo-test.yml b/.github/workflows/cargo-test.yml
deleted file mode 100644
index d827bca..0000000
--- a/.github/workflows/cargo-test.yml
+++ /dev/null
@@ -1,35 +0,0 @@
-name: cargo-test
-
-on:
-  push:
-  pull_request:
-
-jobs:
-  test-unix:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-    steps:
-      - uses: actions/checkout@v2
-      - uses: cachix/install-nix-action@v12
-        with:
-          nix_path: nixpkgs=channel:nixos-stable
-      # - uses: cachix/cachix-action@v8
-      #   with:
-      #     name: zoxide
-      #     authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
-      - run: nix-shell --pure --run "cargo test --all-features --all-targets --color=always --no-fail-fast"
-  test-windows:
-    runs-on: windows-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --all-features --all-targets --color=always --no-fail-fast
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..389d06b
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,26 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  ci:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/install@v0.1
+        if: ${{ matrix.os == 'windows-latest' }}
+        with:
+          crate: cargo-audit
+          version: latest
+      - uses: cachix/install-nix-action@v12
+        if: ${{ matrix.os != 'windows-latest' }}
+        with:
+          nix_path: nixpkgs=channel:nixos-stable
+      - run: make test
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c756b34..8dcfeeb 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -62,7 +62,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           tag_name: ${{ github.ref }}
-          release_name: Release ${{ github.ref }}
+          release_name: ${{ github.ref }}
 
       - uses: actions/download-artifact@v2
 
diff --git a/.gitignore b/.gitignore
index bca6f9b..89b1201 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,13 @@
-# Generated by Cargo
-# will have compiled files and executables
+### Custom ###
+.vscode/
+
+### Rust ###
+# Compiled files and executables
 debug/
 target/
 
-# These are backup files generated by rustfmt
+# Backup files generated by rustfmt
 **/*.rs.bk
+
+### Python ###
+.mypy_cache/
diff --git a/Cargo.lock b/Cargo.lock
index 9cf9598..7e6e92d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,15 +2,21 @@
 # It is not intended for manual editing.
 [[package]]
 name = "anyhow"
-version = "1.0.34"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf8dcb5b4bbaa28653b647d8c77bd4ed40183b48882e130c1f1ffb73de069fd7"
+checksum = "28b2cd92db5cbd74e8e5028f7e27dd7aa3090e89e4f2a197cc7c8dfb69c7063b"
+
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 
 [[package]]
 name = "askama"
-version = "0.10.3"
+version = "0.10.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70a6e7ebd44d0047fd48206c83c5cd3214acc7b9d87f001da170145c47ef7d12"
+checksum = "d298738b6e47e1034e560e5afe63aa488fea34e25ec11b855a76f0d7b8e73134"
 dependencies = [
  "askama_derive",
  "askama_escape",
@@ -19,13 +25,12 @@ dependencies = [
 
 [[package]]
 name = "askama_derive"
-version = "0.10.3"
+version = "0.10.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1d7169690c4f56343dcd821ab834972a22570a2662a19a84fd7775d5e1c3881"
+checksum = "ca2925c4c290382f9d2fa3d1c1b6a63fa1427099721ecca4749b154cc9c25522"
 dependencies = [
  "askama_shared",
  "proc-macro2",
- "quote",
  "syn",
 ]
 
@@ -37,9 +42,9 @@ checksum = "90c108c1a94380c89d2215d0ac54ce09796823cca0fd91b299cfff3b33e346fb"
 
 [[package]]
 name = "askama_shared"
-version = "0.10.4"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62fc272363345c8cdc030e4c259d9d028237f8b057dc9bb327772a257bde6bb5"
+checksum = "2582b77e0f3c506ec4838a25fa8a5f97b9bed72bb6d3d272ea1c031d8bd373bc"
 dependencies = [
  "askama_escape",
  "nom",
@@ -50,10 +55,11 @@ dependencies = [
 
 [[package]]
 name = "assert_cmd"
-version = "1.0.1"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c88b9ca26f9c16ec830350d309397e74ee9abdfd8eb1f71cb6ecc71a3fc818da"
+checksum = "f2475b58cd94eb4f70159f4fd8844ba3b807532fe3131b3373fae060bbe30396"
 dependencies = [
+ "bstr",
  "doc-comment",
  "predicates",
  "predicates-core",
@@ -80,9 +86,9 @@ checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
 [[package]]
 name = "bincode"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f30d3a39baa26f9651f17b375061f3233dde33424a8b72b0dbe93a68a0bc896d"
+checksum = "d175dfa69e619905c4c3cdb7c3c203fa3bdd5d51184e3afdb2742c0280493772"
 dependencies = [
  "byteorder",
  "serde",
@@ -94,18 +100,35 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "bitvec"
+version = "0.19.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8942c8d352ae1838c9dda0b0ca2ab657696ef2232a20147cf1b30ae1a9cb4321"
+dependencies = [
+ "funty",
+ "radium",
+ "tap",
+ "wyz",
+]
+
+[[package]]
+name = "bstr"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a40b47ad93e1a5404e6c18dec46b628214fee441c70f4ab5d6942142cc268a3d"
+dependencies = [
+ "lazy_static",
+ "memchr",
+ "regex-automata",
+]
+
 [[package]]
 name = "byteorder"
 version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 
-[[package]]
-name = "cfg-if"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
-
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -156,15 +179,15 @@ version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
 dependencies = [
- "cfg-if 1.0.0",
+ "cfg-if",
  "dirs-sys-next",
 ]
 
 [[package]]
 name = "dirs-sys-next"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99de365f605554ae33f115102a02057d4fc18b01f3284d6870be0938743cfe7d"
+checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
 dependencies = [
  "libc",
  "redox_users",
@@ -184,14 +207,31 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b2641c4a7c0c4101df53ea572bffdc561c146f6c2eb09e4df02bc4811e3feeb4"
 
 [[package]]
-name = "getrandom"
-version = "0.1.15"
+name = "funty"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc587bc0ec293155d5bfa6b9891ec18a1e330c234f896ea47fbada4cadbe47e6"
+checksum = "fed34cd105917e91daa4da6b3728c47b068749d6a62c59811f06ed2ac71d9da7"
+
+[[package]]
+name = "getrandom"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
- "cfg-if 0.1.10",
+ "cfg-if",
  "libc",
- "wasi",
+ "wasi 0.9.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi 0.10.2+wasi-snapshot-preview1",
 ]
 
 [[package]]
@@ -208,27 +248,27 @@ checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
 
 [[package]]
 name = "heck"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
+checksum = "87cbf45460356b7deeb5e3415b5563308c0a9b057c85e12b06ad551f98d0a6ac"
 dependencies = [
  "unicode-segmentation",
 ]
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.17"
+version = "0.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5aca5565f760fb5b220e499d72710ed156fdb74e631659e99377d9ebfbd13ae8"
+checksum = "322f4de77956e22ed0e5032c359a0f1273f1f7f0d79bfa3b8ffbc730d7fbcc5c"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "indexmap"
-version = "1.6.0"
+version = "1.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "55e2e4c765aa53a0424761bf9f41aa7a6ac1efa87238f59560640e27fca028f2"
+checksum = "824845a0bf897a9042383849b02c1bc219c2383772efcd5c6f9766fa4b81aef3"
 dependencies = [
  "autocfg",
  "hashbrown",
@@ -241,10 +281,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
-name = "libc"
-version = "0.2.80"
+name = "lexical-core"
+version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58d1b70b004888f764dfbf6a26a3b0342a1632d33968e4a179d8011c760614"
+checksum = "21f866863575d0e1d654fbeeabdc927292fdf862873dc3c96c6f753357e13374"
+dependencies = [
+ "arrayvec",
+ "bitflags",
+ "cfg-if",
+ "ryu",
+ "static_assertions",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.91"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8916b1f6ca17130ec6568feccee27c156ad12037880833a3b842a823236502e7"
 
 [[package]]
 name = "memchr"
@@ -254,10 +307,13 @@ checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
 [[package]]
 name = "nom"
-version = "5.1.2"
+version = "6.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
+checksum = "e7413f999671bd4745a7b624bd370a569fb6bc574b23c83a3c5ed2e453f3d5e2"
 dependencies = [
+ "bitvec",
+ "funty",
+ "lexical-core",
  "memchr",
  "version_check",
 ]
@@ -273,15 +329,15 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.4.1"
+version = "1.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "260e51e7efe62b592207e9e13a68e43692a7a279171d6ba57abd208bf23645ad"
+checksum = "af8b08b04175473088b46763e51ee54da5f9a164bc162f615b91bc179dbf15a3"
 
 [[package]]
 name = "ordered-float"
-version = "2.0.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fe9037165d7023b1228bc4ae9a2fa1a2b0095eca6c2998c624723dfd01314a5"
+checksum = "766f840da25490628d8e63e529cd21c014f6600c6b8517add12a6fa6167a6218"
 dependencies = [
  "num-traits",
 ]
@@ -300,9 +356,9 @@ checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
 
 [[package]]
 name = "predicates"
-version = "1.0.5"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96bfead12e90dccead362d62bb2c90a5f6fc4584963645bc7f71a735e0b0735a"
+checksum = "eeb433456c1a57cc93554dea3ce40b4c19c4057e41c55d4a0f3d84ea71c325aa"
 dependencies = [
  "difference",
  "predicates-core",
@@ -310,15 +366,15 @@ dependencies = [
 
 [[package]]
 name = "predicates-core"
-version = "1.0.0"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06075c3a3e92559ff8929e7a280684489ea27fe44805174c3ebd9328dcb37178"
+checksum = "57e35a3326b75e49aa85f5dc6ec15b41108cf5aee58eabb1f274dd18b73c2451"
 
 [[package]]
 name = "predicates-tree"
-version = "1.0.0"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e63c4859013b38a76eca2414c64911fba30def9e3202ac461a2d22831220124"
+checksum = "15f553275e5721409451eb85e15fd9a860a6e5ab4496eb215987502b5f5391f2"
 dependencies = [
  "predicates-core",
  "treeline",
@@ -359,24 +415,42 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.7"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
 dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "radium"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "941ba9d78d8e2f7ce474c015eea4d9c6d25b6a3327f9832ee29a4de27f91bbb8"
+
 [[package]]
 name = "rand"
 version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
- "getrandom",
+ "getrandom 0.1.16",
  "libc",
- "rand_chacha",
- "rand_core",
- "rand_hc",
+ "rand_chacha 0.2.2",
+ "rand_core 0.5.1",
+ "rand_hc 0.2.0",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ef9e7e66b4468674bfcb0c81af8b7fa0bb154fa9f28eb840da5c447baeb8d7e"
+dependencies = [
+ "libc",
+ "rand_chacha 0.3.0",
+ "rand_core 0.6.2",
+ "rand_hc 0.3.0",
 ]
 
 [[package]]
@@ -386,7 +460,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e12735cf05c9e10bf21534da50a147b924d555dc7a547c42e6bb2d5b6017ae0d"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.6.2",
 ]
 
 [[package]]
@@ -395,7 +479,16 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 dependencies = [
- "getrandom",
+ "getrandom 0.1.16",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34cf66eb183df1c5876e2dcf6b13d57340741e8dc255b48e40a26de954d06ae7"
+dependencies = [
+ "getrandom 0.2.2",
 ]
 
 [[package]]
@@ -404,25 +497,46 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 dependencies = [
- "rand_core",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3190ef7066a446f2e7f42e239d161e905420ccab01eb967c9eb27d21b2322a73"
+dependencies = [
+ "rand_core 0.6.2",
 ]
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.57"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
+checksum = "94341e4e44e24f6b591b59e47a8a027df12e008d73fd5672dbea9cc22f4507d9"
+dependencies = [
+ "bitflags",
+]
 
 [[package]]
 name = "redox_users"
-version = "0.3.5"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de0737333e7a9502c789a36d7c7fa6092a49895d4faa31ca5df163857ded2e9d"
+checksum = "528532f3d801c87aec9def2add9ca802fe569e44a544afe633765267840abe64"
 dependencies = [
- "getrandom",
+ "getrandom 0.2.2",
  "redox_syscall",
 ]
 
+[[package]]
+name = "regex-automata"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae1ded71d66a4a97f5e961fd0cb25a5f366a42a41570d16a763a69c092c26ae4"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.3"
@@ -432,6 +546,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
+
 [[package]]
 name = "seq-macro"
 version = "0.2.1"
@@ -440,24 +560,30 @@ checksum = "d5b3bd665f328d73d7079123bfbd14a6edd74187667b5c6f340adfc65ea9d25a"
 
 [[package]]
 name = "serde"
-version = "1.0.117"
+version = "1.0.125"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b88fa983de7720629c9387e9f517353ed404164b1e482c970a90c1a4aaf7dc1a"
+checksum = "558dc50e1a5a5fa7112ca2ce4effcb321b0300c0d4ccf0776a9f60cd89031171"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.117"
+version = "1.0.125"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cbd1ae72adb44aab48f325a02444a5fc079349a8d804c1fc922aed3f7454c74e"
+checksum = "b093b7a2bb58203b5da3056c05b4ec1fed827dcfdb37347a8841695263b3d06d"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn",
 ]
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "strsim"
 version = "0.10.0"
@@ -466,9 +592,9 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "1.0.48"
+version = "1.0.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc371affeffc477f42a221a1e4297aedcea33d47d19b61455588bd9d8f6b19ac"
+checksum = "6498a9efc342871f91cc2d0d694c674368b4ceb40f62b65a7a08c3792935e702"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -476,14 +602,20 @@ dependencies = [
 ]
 
 [[package]]
-name = "tempfile"
-version = "3.1.0"
+name = "tap"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
+checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
+
+[[package]]
+name = "tempfile"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dac1c663cfc93810f88aed9b8941d48cabf856a1b111c29a40439018d870eb22"
 dependencies = [
- "cfg-if 0.1.10",
+ "cfg-if",
  "libc",
- "rand",
+ "rand 0.8.3",
  "redox_syscall",
  "remove_dir_all",
  "winapi",
@@ -491,9 +623,9 @@ dependencies = [
 
 [[package]]
 name = "termcolor"
-version = "1.1.0"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
+checksum = "2dfed899f0eb03f32ee8c6a0aabdb8a7949659e3466561fc0adf54e26d88c5f4"
 dependencies = [
  "winapi-util",
 ]
@@ -515,9 +647,9 @@ checksum = "a7f741b240f1a48843f9b8e0444fb55fb2a4ff67293b50a9179dfd5ea67f8d41"
 
 [[package]]
 name = "unicode-segmentation"
-version = "1.6.0"
+version = "1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
+checksum = "bb0d2e7be6ae3a5fa87eed5fb451aff96f2573d2694942e40543ae0bbe19c796"
 
 [[package]]
 name = "unicode-width"
@@ -539,9 +671,9 @@ checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
 
 [[package]]
 name = "version_check"
-version = "0.9.2"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
+checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
 
 [[package]]
 name = "wait-timeout"
@@ -558,6 +690,12 @@ version = "0.9.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 
+[[package]]
+name = "wasi"
+version = "0.10.2+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -589,6 +727,12 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "wyz"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
+
 [[package]]
 name = "zoxide"
 version = "0.5.0"
@@ -603,7 +747,7 @@ dependencies = [
  "glob",
  "once_cell",
  "ordered-float",
- "rand",
+ "rand 0.7.3",
  "seq-macro",
  "serde",
  "tempfile",
diff --git a/Cargo.toml b/Cargo.toml
index 7604b9d..c9d655b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,12 +2,12 @@
 name = "zoxide"
 version = "0.5.0"
 authors = ["Ajeet D'Souza <98ajeet@gmail.com>"]
+edition = "2018"
 description = "A faster way to navigate your filesystem"
 repository = "https://github.com/ajeetdsouza/zoxide/"
-edition = "2018"
+license = "MIT"
 keywords = ["cli"]
 categories = ["command-line-utilities", "filesystem"]
-license = "MIT"
 
 [dependencies]
 anyhow = "1.0.32"
@@ -25,10 +25,30 @@ tempfile = "3.1.0"
 [target.'cfg(windows)'.dependencies]
 rand = "0.7.3"
 
-[target.'cfg(unix)'.dev-dependencies]
+[dev-dependencies]
 assert_cmd = "1.0.1"
 seq-macro = "0.2.1"
 
+[features]
+default = []
+# Adds tests for code generated by `zoxide init`.
+# This requires the following external programs available in $PATH:
+# - bash
+# - black: <https://github.com/psf/black>
+# - dash
+# - fish: <https://github.com/fish-shell/fish-shell>
+# - mypy: <https://github.com/python/mypy>
+# - nushell: <https://github.com/nushell/nushell>
+# - powershell: <https://github.com/PowerShell/PowerShell>
+# - pylint: <https://github.com/PyCQA/pylint>
+# - shellcheck: <https://github.com/koalaman/shellcheck>
+# - shfmt: <https://github.com/mvdan/sh>
+# - xonsh: <https://github.com/xonsh/xonsh>
+# - zsh: <https://github.com/zsh-users/zsh>
+# Since most users are unlikely to have installed all of the above, these tests
+# are disabled by default.
+shell_tests = []
+
 [profile.release]
 codegen-units = 1
 lto = true
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..eaa5007
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,63 @@
+ifeq ($(CI), true)
+	ci_color_always := --color=always
+endif
+
+ifeq ($(RELEASE), true)
+	build_flags := --release
+endif
+
+ifeq ($(OS), Windows_NT)
+	NIX := false
+else
+	NIX := true
+endif
+
+.PHONY: build clean install test uninstall
+
+ifeq ($(NIX), true)
+build:
+	nix-shell --pure --run 'cargo build $(build_flags) $(ci_color_always)'
+else
+build:
+	cargo build $(build_flags) $(ci_color_always)
+endif
+
+ifeq ($(NIX), true)
+clean:
+	nix-shell --pure --run 'cargo clean $(ci_color_always)'
+else
+clean:
+	cargo clean $(ci_color_always)
+endif
+
+ifeq ($(NIX), true)
+install:
+	nix-shell --pure --run 'cargo install --path=. $(ci_color_always)'
+else
+install:
+	cargo install --path=. $(ci_color_always)
+endif
+
+ifeq ($(NIX), true)
+test:
+	nix-shell --pure --run 'cargo fmt -- --check --files-with-diff $(ci_color_always)'
+	nix-shell --pure --run 'cargo check --all-features $(ci_color_always)'
+	nix-shell --pure --run 'cargo clippy --all-features $(ci_color_always) -- --deny warnings --deny clippy::all'
+	nix-shell --pure --run 'cargo test --all-features --no-fail-fast $(ci_color_always)'
+	nix-shell --pure --run 'cargo audit --deny warnings $(ci_color_always) --ignore=RUSTSEC-2020-0095'
+else
+test:
+	cargo fmt -- --check --files-with-diff $(ci_color_always)
+	cargo check --all-features $(ci_color_always)
+	cargo clippy --all-features $(ci_color_always) -- --deny warnings --deny clippy::all
+	cargo test --no-fail-fast $(ci_color_always)
+	cargo audit --deny warnings $(ci_color_always) --ignore=RUSTSEC-2020-0095
+endif
+
+ifeq ($(NIX), true)
+uninstall:
+	nix-shell --pure --run 'cargo uninstall $(ci_color_always)'
+else
+uninstall:
+	cargo uninstall $(ci_color_always)
+endif
diff --git a/shell.nix b/shell.nix
index 17aa560..e6e11a2 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,32 +1,26 @@
 { pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/20.09.tar.gz") {} }:
 
 let
-  my-python3-pkgs = python3-pkgs: with python3-pkgs; [
-    black
-    mypy
-    pylint
-  ];
-  my-python3 = pkgs.python3.withPackages my-python3-pkgs;
+  python-pkgs = pkgs.python3.withPackages (pkgs: [ pkgs.black pkgs.mypy pkgs.pylint ]);
 in
 
 pkgs.mkShell {
   name = "env";
-  nativeBuildInputs = [
-    pkgs.rustc
-    pkgs.cargo
-  ];
   buildInputs = [
     pkgs.bash
+    pkgs.cargo
+    pkgs.cargo-audit
     pkgs.dash
     pkgs.fish
     pkgs.fzf
     pkgs.git
     pkgs.powershell
+    pkgs.rustc
     pkgs.shellcheck
     pkgs.shfmt
     pkgs.xonsh
     pkgs.zsh
-    my-python3
+    python-pkgs
   ];
 
   # Set Environment Variables
diff --git a/src/db/dir.rs b/src/db/dir.rs
index b869a3c..73ed2cd 100644
--- a/src/db/dir.rs
+++ b/src/db/dir.rs
@@ -153,7 +153,7 @@ impl Display for DirDisplayScore<'_> {
         let score = if score > 9999.0 {
             9999
         } else if score > 0.0 {
-            score as _
+            score as u32
         } else {
             0
         };
@@ -163,3 +163,26 @@ impl Display for DirDisplayScore<'_> {
 
 pub type Rank = f64;
 pub type Epoch = u64;
+
+#[cfg(test)]
+mod tests {
+    use super::{Dir, DirList};
+
+    use std::borrow::Cow;
+
+    #[test]
+    fn zero_copy() {
+        let dirs = DirList(vec![Dir {
+            path: "/".into(),
+            rank: 0.0,
+            last_accessed: 0,
+        }]);
+
+        let bytes = dirs.to_bytes().unwrap();
+        let dirs = DirList::from_bytes(&bytes).unwrap();
+
+        for dir in dirs.iter() {
+            assert!(matches!(dir.path, Cow::Borrowed(_)))
+        }
+    }
+}
diff --git a/src/db/mod.rs b/src/db/mod.rs
index dcd6091..d53a4f0 100644
--- a/src/db/mod.rs
+++ b/src/db/mod.rs
@@ -53,9 +53,9 @@ impl<'a> Database<'a> {
         Ok(())
     }
 
+    /// Adds a new directory or increments its rank. Also updates its last accessed time.
     pub fn add<S: AsRef<str>>(&mut self, path: S, now: Epoch) {
         let path = path.as_ref();
-        debug_assert!(Path::new(path).is_absolute());
 
         match self.dirs.iter_mut().find(|dir| dir.path == path) {
             None => self.dirs.push(Dir {
@@ -85,6 +85,8 @@ impl<'a> Database<'a> {
             .filter(move |dir| dir.is_match(&query, resolve_symlinks))
     }
 
+    /// Removes the directory with `path` from the store.
+    /// This does not preserve ordering, but is O(1).
     pub fn remove<S: AsRef<str>>(&mut self, path: S) -> bool {
         let path = path.as_ref();
 
diff --git a/src/import/autojump.rs b/src/import/autojump.rs
index ae03bf6..f5e31cf 100644
--- a/src/import/autojump.rs
+++ b/src/import/autojump.rs
@@ -43,9 +43,11 @@ impl Import for Autojump {
             .with_context(|| format!("line {}: error reading from autojump database", idx + 1))?;
         }
 
+        // Don't import actual ranks from autojump, since its algorithm is
+        // very different, and might take a while to get normalized.
         let rank_sum = entries.iter().map(|(_, rank)| rank).sum::<f64>();
         for &(path, rank) in entries.iter() {
-            if db.dirs.iter_mut().find(|dir| dir.path == path).is_none() {
+            if !db.dirs.iter().any(|dir| dir.path == path) {
                 db.dirs.push(Dir {
                     path: Cow::Owned(path.into()),
                     rank: rank / rank_sum,
diff --git a/src/shell.rs b/src/shell.rs
index 0636187..56f087d 100644
--- a/src/shell.rs
+++ b/src/shell.rs
@@ -37,7 +37,7 @@ pub enum Hook {
     Pwd,
 }
 
-#[cfg(unix)]
+#[cfg(feature = "shell_tests")]
 #[cfg(test)]
 mod tests {
     use super::*;