diff --git a/Cargo.lock b/Cargo.lock
index c94c21c..1e71189 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,6 +8,17 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "ahash"
+version = "0.7.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "891477e0c6a8957309ee5c45a6368af3ae14bb510732d2684ffa19af310920f9"
+dependencies = [
+ "getrandom",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "ahash"
 version = "0.8.3"
@@ -57,9 +68,9 @@ checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
 
 [[package]]
 name = "anstream"
-version = "0.6.4"
+version = "0.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2ab91ebe16eb252986481c5b62f6098f3b698a45e34b5b98200cf20dd2484a44"
+checksum = "96b09b5178381e0874812a9b157f7fe84982617e48f71f4e3235482775e5b540"
 dependencies = [
  "anstyle",
  "anstyle-parse",
@@ -71,9 +82,9 @@ dependencies = [
 
 [[package]]
 name = "anstyle"
-version = "1.0.4"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7079075b41f533b8c61d2a4d073c4676e1f8b249ff94a393b0595db304e0dd87"
+checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
 
 [[package]]
 name = "anstyle-parse"
@@ -115,6 +126,21 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
+[[package]]
+name = "assert_cmd"
+version = "2.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88903cb14723e4d4003335bb7f8a14f27691649105346a0f0957466c096adfe6"
+dependencies = [
+ "anstyle",
+ "bstr",
+ "doc-comment",
+ "predicates",
+ "predicates-core",
+ "predicates-tree",
+ "wait-timeout",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -138,7 +164,7 @@ dependencies = [
  "regex",
  "rustc-hash",
  "shlex",
- "syn",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -168,6 +194,53 @@ version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4682ae6287fcf752ecaabbfcc7b6f9b72aa33933dc23a554d853aea8eea8635"
 
+[[package]]
+name = "bitvec"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bc2832c24239b0141d5674bb9174f9d68a8b5b3f2753311927c172ca46f7e9c"
+dependencies = [
+ "funty",
+ "radium",
+ "tap",
+ "wyz",
+]
+
+[[package]]
+name = "borsh"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f58b559fd6448c6e2fd0adb5720cd98a2506594cafa4737ff98c396f3e82f667"
+dependencies = [
+ "borsh-derive",
+ "cfg_aliases",
+]
+
+[[package]]
+name = "borsh-derive"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7aadb5b6ccbd078890f6d7003694e33816e6b784358f18e15e7e6d9f065a57cd"
+dependencies = [
+ "once_cell",
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.38",
+ "syn_derive",
+]
+
+[[package]]
+name = "bstr"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "542f33a8835a0884b006a0c3df3dadd99c0c3f296ed26c2fdc8028e01ad6230c"
+dependencies = [
+ "memchr",
+ "regex-automata 0.4.3",
+ "serde",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.14.0"
@@ -176,14 +249,43 @@ checksum = "7f30e7476521f6f8af1a1c4c0b8cc94f0bee37d91763d0ca2665f299b6cd8aec"
 
 [[package]]
 name = "byte-unit"
-version = "4.0.19"
+version = "5.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da78b32057b8fdfc352504708feeba7216dcd65a2c9ab02978cbd288d1279b6c"
+checksum = "33ac19bdf0b2665407c39d82dbc937e951e7e2001609f0fb32edd0af45a2d63e"
 dependencies = [
+ "rust_decimal",
  "serde",
  "utf8-width",
 ]
 
+[[package]]
+name = "bytecheck"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23cdc57ce23ac53c931e88a43d06d070a6fd142f2617be5855eb75efc9beb1c2"
+dependencies = [
+ "bytecheck_derive",
+ "ptr_meta",
+ "simdutf8",
+]
+
+[[package]]
+name = "bytecheck_derive"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3db406d29fbcd95542e92559bed4d8ad92636d1ca8b3b72ede10b4bcc010e659"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "bytes"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
+
 [[package]]
 name = "bytesize"
 version = "1.3.0"
@@ -220,6 +322,12 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "cfg_aliases"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd16c4719339c4530435d38e511904438d07cce7950afa3718a84ac36c10e89e"
+
 [[package]]
 name = "chrono"
 version = "0.4.31"
@@ -231,7 +339,7 @@ dependencies = [
  "num-traits",
  "pure-rust-locales",
  "serde",
- "windows-targets",
+ "windows-targets 0.48.5",
 ]
 
 [[package]]
@@ -291,6 +399,15 @@ dependencies = [
  "clap_derive",
 ]
 
+[[package]]
+name = "clap-stdin"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc126d12a0930c94c3548581294d5f19360ac02e408600b4d7619d7234e8b505"
+dependencies = [
+ "thiserror",
+]
+
 [[package]]
 name = "clap_builder"
 version = "4.4.6"
@@ -314,7 +431,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -448,6 +565,12 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2696e8a945f658fd14dc3b87242e6b80cd0f36ff04ea560fa39082368847946"
 
+[[package]]
+name = "difflib"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6184e33543162437515c2e2b48714794e37845ec9851711914eec9d308f6ebe8"
+
 [[package]]
 name = "dirs-next"
 version = "2.0.0"
@@ -469,23 +592,39 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "doc-comment"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
+
 [[package]]
 name = "either"
 version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
+[[package]]
+name = "env_filter"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a009aa4810eb158359dda09d0c87378e4bbb89b5a801f016885a4707ba24f7ea"
+dependencies = [
+ "log",
+ "regex",
+]
+
 [[package]]
 name = "env_logger"
-version = "0.10.0"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85cdab6a89accf66733ad5a1693a4dcced6aeff64602b634530dd73c1f3ee9f0"
+checksum = "6c012a26a7f605efc424dd53697843a72be7dc86ad2d01f7814337794a12231d"
 dependencies = [
+ "anstream",
+ "anstyle",
+ "env_filter",
  "humantime",
- "is-terminal",
  "log",
- "regex",
- "termcolor",
 ]
 
 [[package]]
@@ -526,9 +665,9 @@ dependencies = [
 
 [[package]]
 name = "fancy-regex"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b95f7c0680e4142284cf8b22c14a476e87d61b004a3a0861872b32ef7ead40a2"
+checksum = "7493d4c459da9f84325ad297371a6b2b8a162800873a22e3b6b6512e61d18c05"
 dependencies = [
  "bit-set",
  "regex",
@@ -544,6 +683,12 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "funty"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6d5a32815ae3f33302d95fdcb2ce17862f8c65363dcfd29360480ba1001fc9c"
+
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -567,13 +712,22 @@ version = "1.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
 
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash 0.7.8",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.14.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7dfda62a12f55daeae5015f81b0baea145391cb4520f86c248fc615d72640d12"
 dependencies = [
- "ahash",
+ "ahash 0.8.3",
  "allocator-api2",
 ]
 
@@ -612,7 +766,7 @@ dependencies = [
  "iana-time-zone-haiku",
  "js-sys",
  "wasm-bindgen",
- "windows",
+ "windows 0.48.0",
 ]
 
 [[package]]
@@ -631,7 +785,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d530e1a18b1cb4c484e6e34556a0d948706958449fca0cab753d649f2bce3d1f"
 dependencies = [
  "equivalent",
- "hashbrown",
+ "hashbrown 0.14.1",
 ]
 
 [[package]]
@@ -681,6 +835,15 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba291022dbbd398a455acf126c1e341954079855bc60dfdda641363bd6922569"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.9"
@@ -710,9 +873,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.149"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a08173bc88b7955d1b3145aa561539096c421ac8debde8cbc3612ec635fee29b"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libloading"
@@ -753,14 +916,14 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2994eeba8ed550fd9b47a0b38f0242bc3344e496483c6180b69139cc2fa5d1d7"
 dependencies = [
- "hashbrown",
+ "hashbrown 0.14.1",
 ]
 
 [[package]]
 name = "lscolors"
-version = "0.15.0"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf7015a04103ad78abb77e4b79ed151e767922d1cfde5f62640471c629a2320d"
+checksum = "53304fff6ab1e597661eee37e42ea8c47a146fca280af902bb76bff8a896e523"
 dependencies = [
  "nu-ansi-term",
 ]
@@ -816,7 +979,7 @@ checksum = "49e7bc1560b95a3c4a25d03de42fe76ca718ab92d1a22a55b9b4cf67b3ae635c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -866,21 +1029,21 @@ dependencies = [
 
 [[package]]
 name = "nu-ansi-term"
-version = "0.49.0"
+version = "0.50.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c073d3c1930d0751774acf49e66653acecb416c3a54c6ec095a9b11caddb5a68"
+checksum = "dd2800e1520bdc966782168a627aa5d1ad92e33b984bf7c7615d31280c83ff14"
 dependencies = [
  "windows-sys",
 ]
 
 [[package]]
 name = "nu-cmd-lang"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "63cb11e1ff0dfa73b286411744044cc3bc415135b4b1d9222d724bd517876d8c"
+checksum = "6b9ff31cc095e7f4fb1140a94de76e8fc2e7d4eaf6a761eb482cf32609ce5d27"
 dependencies = [
  "fancy-regex",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "nu-ansi-term",
  "nu-engine",
  "nu-parser",
@@ -891,9 +1054,9 @@ dependencies = [
 
 [[package]]
 name = "nu-engine"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f31549205c091d89cb1bad9e97a5944b998f9417a718c0ad5d1ca373abe27c8b"
+checksum = "e14c9964821cb71d32bcf70dde6a9b0ba8e246cfc821561eddec03d9a3fe8c87"
 dependencies = [
  "nu-glob",
  "nu-path",
@@ -903,19 +1066,19 @@ dependencies = [
 
 [[package]]
 name = "nu-glob"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc6e216ee3e0d3574085e3f9bc63b382d078b159b2f2f1380a6f4d08c1662fd"
+checksum = "506855a5ab4939d7895efcc12faf4e97cf98c07251ce22baaddb41237f6a3100"
 
 [[package]]
 name = "nu-parser"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01db27d8c7a31504baf78c1b8f9104a5c77719ac08476ffb55738d86697e501d"
+checksum = "da96ad77c42106f1bb53ba44fcb9ec405be71bb1eed3d9abab03b03be885b1de"
 dependencies = [
  "bytesize",
  "chrono",
- "itertools 0.11.0",
+ "itertools 0.12.1",
  "log",
  "nu-engine",
  "nu-path",
@@ -925,9 +1088,9 @@ dependencies = [
 
 [[package]]
 name = "nu-path"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b89b96e3df2637c95dfb893ba0a97646d1733d6957e31ba3e6f46bee09cdea29"
+checksum = "4a4dbc274758daaa42844476a24ed177313c22a8cfd41e7c11506c6c4c7882a9"
 dependencies = [
  "dirs-next",
  "omnipath",
@@ -936,9 +1099,9 @@ dependencies = [
 
 [[package]]
 name = "nu-protocol"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "243a5a60997b63173dd2e0fdd5c1a6d2c25e0782e444c23714fedeef3ac95949"
+checksum = "b55b914bb2bf4ba26b72633c362ee9c1c160b28b62d904013a7f3424edacd471"
 dependencies = [
  "byte-unit",
  "chrono",
@@ -959,9 +1122,9 @@ dependencies = [
 
 [[package]]
 name = "nu-system"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8e2cd7ed9a6567b2794de6c82ce7cfa9661895d172190bdfde06d033e56cad0"
+checksum = "2dadea74341e329c0f53fe3f11ac6bba6fca71e5845f4d5c1a2c12bce5a3954e"
 dependencies = [
  "chrono",
  "libc",
@@ -973,14 +1136,14 @@ dependencies = [
  "once_cell",
  "procfs",
  "sysinfo",
- "winapi",
+ "windows 0.52.0",
 ]
 
 [[package]]
 name = "nu-utils"
-version = "0.88.1"
+version = "0.90.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "339eed81dd7f6c59bcd14f9d9076f223c0aa0632b42e1efa60de1376f4fa04bd"
+checksum = "df6cd989464dc19ddb8ae66b972f74570e2f3890970e6a03267580501c293ae5"
 dependencies = [
  "crossterm_winapi",
  "log",
@@ -996,7 +1159,9 @@ name = "nufmt"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "assert_cmd",
  "clap",
+ "clap-stdin",
  "criterion",
  "env_logger",
  "log",
@@ -1091,6 +1256,72 @@ dependencies = [
  "plotters-backend",
 ]
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "predicates"
+version = "3.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6dfc28575c2e3f19cb3c73b93af36460ae898d426eba6fc15b9bd2a5220758a0"
+dependencies = [
+ "anstyle",
+ "difflib",
+ "itertools 0.11.0",
+ "predicates-core",
+]
+
+[[package]]
+name = "predicates-core"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b794032607612e7abeb4db69adb4e33590fa6cf1149e95fd7cb00e634b92f174"
+
+[[package]]
+name = "predicates-tree"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "368ba315fb8c5052ab692e68a0eefec6ec57b23a36959c14496f0b0df2c0cecf"
+dependencies = [
+ "predicates-core",
+ "termtree",
+]
+
+[[package]]
+name = "proc-macro-crate"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d37c51ca738a55da99dc0c4a34860fd675453b8b36209178c2249bb13651284"
+dependencies = [
+ "toml_edit",
+]
+
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.68"
@@ -1126,6 +1357,26 @@ dependencies = [
  "hex",
 ]
 
+[[package]]
+name = "ptr_meta"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0738ccf7ea06b608c10564b31debd4f5bc5e197fc8bfe088f68ae5ce81e7a4f1"
+dependencies = [
+ "ptr_meta_derive",
+]
+
+[[package]]
+name = "ptr_meta_derive"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16b845dbfca988fa33db069c0e230574d15a3088f147a87b64c7589eb662c9ac"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "pure-rust-locales"
 version = "0.7.0"
@@ -1151,6 +1402,42 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "radium"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc33ff2d4973d518d823d61aa239014831e521c75da58e3df4840d3f47749d09"
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "rayon"
 version = "1.8.0"
@@ -1199,7 +1486,7 @@ checksum = "ebee201405406dbf528b8b672104ae6d6d63e6d118cb10e4d51abbc7b58044ff"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-automata",
+ "regex-automata 0.3.9",
  "regex-syntax",
 ]
 
@@ -1214,12 +1501,72 @@ dependencies = [
  "regex-syntax",
 ]
 
+[[package]]
+name = "regex-automata"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
+
 [[package]]
 name = "regex-syntax"
 version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dbb5fb1acd8a1a18b3dd5be62d25485eb770e05afb408a9627d14d451bae12da"
 
+[[package]]
+name = "rend"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71fe3824f5629716b1589be05dacd749f6aa084c87e00e016714a8cdfccc997c"
+dependencies = [
+ "bytecheck",
+]
+
+[[package]]
+name = "rkyv"
+version = "0.7.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cba464629b3394fc4dbc6f940ff8f5b4ff5c7aef40f29166fd4ad12acbc99c0"
+dependencies = [
+ "bitvec",
+ "bytecheck",
+ "bytes",
+ "hashbrown 0.12.3",
+ "ptr_meta",
+ "rend",
+ "rkyv_derive",
+ "seahash",
+ "tinyvec",
+ "uuid",
+]
+
+[[package]]
+name = "rkyv_derive"
+version = "0.7.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7dddfff8de25e6f62b9d64e6e432bf1c6736c57d20323e15ee10435fbda7c65"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "rust_decimal"
+version = "1.34.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b39449a79f45e8da28c57c341891b69a183044b29518bb8f86dbac9df60bb7df"
+dependencies = [
+ "arrayvec",
+ "borsh",
+ "bytes",
+ "num-traits",
+ "rand",
+ "rkyv",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
@@ -1260,6 +1607,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
+[[package]]
+name = "seahash"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c107b6f4780854c8b126e228ea8869f4d7b71260f962fefb57b996b8959ba6b"
+
 [[package]]
 name = "serde"
 version = "1.0.188"
@@ -1277,7 +1630,7 @@ checksum = "4eca7ac642d82aa35b60049a6eccb4be6be75e599bd2e9adb5f875a737654af2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -1293,9 +1646,9 @@ dependencies = [
 
 [[package]]
 name = "shadow-rs"
-version = "0.24.1"
+version = "0.26.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9198caff1c94f1a5df6664bddbc379896b51b98a55b0b3fedcb23078fe00c77"
+checksum = "3e5c5c8276991763b44ede03efaf966eaa0412fafbf299e6380704678ca3b997"
 dependencies = [
  "const_format",
  "is_debug",
@@ -1308,6 +1661,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7cee0529a6d40f580e7a5e6c495c8fbfe21b7b52795ed4bb5e62cdf92bc6380"
 
+[[package]]
+name = "simdutf8"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f27f6278552951f1f2b8cf9da965d10969b2efdea95a6ec47987ab46edfe263a"
+
 [[package]]
 name = "smawk"
 version = "0.3.2"
@@ -1357,6 +1716,17 @@ dependencies = [
  "is-terminal",
 ]
 
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.38"
@@ -1368,6 +1738,18 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "syn_derive"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1329189c02ff984e9736652b1631330da25eaa6bc639089ed4915d25446cbe7b"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.38",
+]
+
 [[package]]
 name = "sys-locale"
 version = "0.3.1"
@@ -1379,9 +1761,9 @@ dependencies = [
 
 [[package]]
 name = "sysinfo"
-version = "0.29.10"
+version = "0.30.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a18d114d420ada3a891e6bc8e96a2023402203296a47cdd65083377dad18ba5"
+checksum = "1fb4f3438c8f6389c864e61221cbc97e9bca98b4daf39a5beb7bea660f528bb2"
 dependencies = [
  "cfg-if",
  "core-foundation-sys",
@@ -1389,17 +1771,14 @@ dependencies = [
  "ntapi",
  "once_cell",
  "rayon",
- "winapi",
+ "windows 0.52.0",
 ]
 
 [[package]]
-name = "termcolor"
-version = "1.3.0"
+name = "tap"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6093bad37da69aab9d123a8091e4be0aa4a03e4d601ec641c327398315f62b64"
-dependencies = [
- "winapi-util",
-]
+checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
 [[package]]
 name = "terminal_size"
@@ -1411,6 +1790,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "termtree"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
+
 [[package]]
 name = "textwrap"
 version = "0.15.2"
@@ -1439,7 +1824,7 @@ checksum = "10712f02019e9288794769fba95cd6847df9874d49d871d062172f9dd41bc4cc"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -1482,6 +1867,38 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "tinyvec"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
+
+[[package]]
+name = "toml_datetime"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3550f4e9685620ac18a50ed434eb3aec30db8ba93b0287467bca5826ea25baf1"
+
+[[package]]
+name = "toml_edit"
+version = "0.21.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a8534fd7f78b5405e860340ad6575217ce99f38d4d5c8f2442cb5ecb50090e1"
+dependencies = [
+ "indexmap",
+ "toml_datetime",
+ "winnow",
+]
+
 [[package]]
 name = "typetag"
 version = "0.2.13"
@@ -1503,7 +1920,7 @@ checksum = "bfc13d450dc4a695200da3074dacf43d449b968baee95e341920e47f61a3b40f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -1551,6 +1968,12 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
+[[package]]
+name = "uuid"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f00cc9702ca12d3c81455259621e676d0f7251cec66a21e98fe2e9a37db93b2a"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"
@@ -1577,6 +2000,15 @@ dependencies = [
  "quote",
 ]
 
+[[package]]
+name = "wait-timeout"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f200f5b12eb75f8c1ed65abd4b2db8a6e1b138a20de009dacee265a2498f3f6"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "walkdir"
 version = "2.4.0"
@@ -1614,7 +2046,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
  "wasm-bindgen-shared",
 ]
 
@@ -1636,7 +2068,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1694,7 +2126,26 @@ version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.48.5",
+]
+
+[[package]]
+name = "windows"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e48a53791691ab099e5e2ad123536d0fff50652600abaf43bbf952894110d0be"
+dependencies = [
+ "windows-core",
+ "windows-targets 0.52.0",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
+dependencies = [
+ "windows-targets 0.52.0",
 ]
 
 [[package]]
@@ -1703,7 +2154,7 @@ version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.48.5",
 ]
 
 [[package]]
@@ -1712,13 +2163,28 @@ version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
 dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a18201040b24831fbb9e4eb208f8892e1f50a37feb53cc7ff887feb8f50e7cd"
+dependencies = [
+ "windows_aarch64_gnullvm 0.52.0",
+ "windows_aarch64_msvc 0.52.0",
+ "windows_i686_gnu 0.52.0",
+ "windows_i686_msvc 0.52.0",
+ "windows_x86_64_gnu 0.52.0",
+ "windows_x86_64_gnullvm 0.52.0",
+ "windows_x86_64_msvc 0.52.0",
 ]
 
 [[package]]
@@ -1727,38 +2193,98 @@ version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb7764e35d4db8a7921e09562a0304bf2f93e0a51bfccee0bd0bb0b666b015ea"
+
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbaa0368d4f1d2aaefc55b6fcfee13f41544ddf36801e793edbbfd7d7df075ef"
+
 [[package]]
 name = "windows_i686_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a28637cb1fa3560a16915793afb20081aba2c92ee8af57b4d5f28e4b3e7df313"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffe5e8e31046ce6230cc7215707b816e339ff4d4d67c65dffa206fd0f7aa7b9a"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
+
+[[package]]
+name = "winnow"
+version = "0.5.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f593a95398737aeed53e489c785df13f3618e41dbcd6718c6addbf1395aa6876"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "wyz"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
+dependencies = [
+ "tap",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 55d4edd..0001dfb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,12 +15,14 @@ categories = ["command-line-utilities"]
 
 [dependencies]
 anyhow = "1.0.71"
+assert_cmd = "2.0.12"
 clap = { version = "4.3.0", optional = true, features = ["unicode", "derive"] }
-env_logger = "0.10.0"
+clap-stdin = "0.4.0"
+env_logger = "0.11.2"
 log = "0.4.17"
-nu-cmd-lang = "0.88.1"
-nu-parser = "0.88.1"
-nu-protocol = "0.88.1"
+nu-cmd-lang = "0.90.1"
+nu-parser = "0.90.1"
+nu-protocol = "0.90.1"
 
 [dev-dependencies]
 criterion = "0.5.1"
diff --git a/src/main.rs b/src/main.rs
index a3de0f2..af078d7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 #![doc = include_str!("../README.md")]
 
 use clap::Parser;
+use clap_stdin::{FileOrStdin, MaybeStdin};
 use log::{error, info, trace};
 use nu_formatter::config::Config;
 use std::{
@@ -20,7 +21,7 @@ enum ExitCode {
 struct Cli {
     #[arg(
         required_unless_present("stdin"),
-        help = "one of more Nushell files you want to format"
+        help = "one of more Nushell files/folders you want to format"
     )]
     files: Vec<PathBuf>,
 
@@ -45,6 +46,7 @@ fn exit_with_code(exit_code: ExitCode) {
 
     // NOTE: this immediately terminates the process without doing any cleanup,
     // so make sure to finish all necessary cleanup before this is called.
+    std::io::stdout().flush().unwrap();
     std::process::exit(code);
 }
 
@@ -52,8 +54,7 @@ fn main() {
     env_logger::init();
 
     let cli = Cli::parse();
-    trace!("recieved cli.files: {:?}", cli.files);
-    trace!("recieved cli.stdin: {:?}", cli.stdin);
+    trace!("recieved cli.input: {:?}", cli.input);
     trace!("recieved cli.config: {:?}", cli.config);
 
     let cli_config = match cli.config {
@@ -66,23 +67,32 @@ fn main() {
         }
     };
 
-    let exit_code = match cli.files[..] {
-        [] if cli.stdin => {
-            let stdin_input = io::stdin().lines().map(|x| x.unwrap()).collect();
-            format_string(Some(stdin_input), &cli_config)
+    let exit_code = if !file.exists() {
+        error!("Error: {} not found!", file.to_str().unwrap());
+        return ExitCode::Failure;
+    } else if file.is_dir() {
+        for path in recurse_files(file).unwrap() {
+            if is_file_extension(&path, ".nu") {
+                info!("formatting file: {:?}", &path);
+                nu_formatter::format_single_file(&path, options);
+            } else {
+                info!("not nu file: skipping");
+            }
         }
-        _ => format_files(cli.files, &cli_config),
+        // Files only
+    } else {
+        info!("formatting file: {:?}", file);
+        nu_formatter::format_single_file(file, options);
     };
-
-    std::io::stdout().flush().unwrap();
+    //format_string(cli.input.contents().unwrap(), &cli_config);
 
     exit_with_code(exit_code);
 }
 
 /// format a string passed via stdin and output it directly to stdout
-fn format_string(string: Option<String>, options: &Config) -> ExitCode {
-    let output = nu_formatter::format_string(&string.unwrap(), options);
-    println!("{output}");
+fn format_string(string: String, options: &Config) -> ExitCode {
+    let output = nu_formatter::format_string(&string, options);
+    println!("output: \n{output}");
 
     ExitCode::Success
 }
@@ -141,10 +151,23 @@ fn is_file_extension(file: &Path, extension: &str) -> bool {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use assert_cmd::Command as AssertCommand;
+    use clap::CommandFactory;
+    use std::fs::File;
 
     #[test]
     fn clap_cli_construction() {
-        use clap::CommandFactory;
         Cli::command().debug_assert();
     }
+
+    #[test]
+    fn pipe_stdin_to_cli() {
+        // TODO: create a file instead of reading one in the repo
+        let mut file = File::create("tests.txt").unwrap();
+        file.write_all(b"Hello, world!").unwrap();
+        let mut binding = AssertCommand::cargo_bin("nufmt").unwrap();
+        let result = dbg!(binding.arg("-s").arg("-").pipe_stdin("tests.txt").ok());
+
+        result.unwrap().assert().success();
+    }
 }