From 71b052e343f88e34800ca0c307cb50bdf81909f9 Mon Sep 17 00:00:00 2001
From: Jeff <dev@jeffa.io>
Date: Wed, 27 Dec 2023 04:15:35 -0500
Subject: [PATCH] Begin TUI implementation

---
 Cargo.lock  | 354 ++++++++++++++++++++--------------------------------
 Cargo.toml  |   9 +-
 src/main.rs | 138 +++++---------------
 3 files changed, 172 insertions(+), 329 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 7496f6f..1b287a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,6 +17,18 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "ahash"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91429305e9f0a25f6205c5b8e0d2db09e0708a7a6df0f42212bb56c32c8ac97a"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.1"
@@ -26,6 +38,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "allocator-api2"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
+
 [[package]]
 name = "ansi_term"
 version = "0.12.1"
@@ -134,13 +152,18 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
+[[package]]
+name = "cassowary"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df8670b8c7b9dae1793364eafadf7239c40d669904660c5960d74cfd80b46a53"
+
 [[package]]
 name = "cc"
 version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
 dependencies = [
- "jobserver",
  "libc",
 ]
 
@@ -190,35 +213,12 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cd7cc57abe963c6d3b9d8be5b06ba7c8957a930305ca90304f24ef040aa6f961"
 
-[[package]]
-name = "clipboard-win"
-version = "4.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7191c27c2357d9b7ef96baac1773290d4ca63b24205b82a3fd8a0637afcf0362"
-dependencies = [
- "error-code",
- "str-buf",
- "winapi",
-]
-
 [[package]]
 name = "colorchoice"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
 
-[[package]]
-name = "comfy-table"
-version = "7.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ab77dbd8adecaf3f0db40581631b995f312a8a5ae3aa9993188bb8f23d83a5b"
-dependencies = [
- "crossterm",
- "strum",
- "strum_macros",
- "unicode-width",
-]
-
 [[package]]
 name = "core-foundation"
 version = "0.9.3"
@@ -270,11 +270,11 @@ dependencies = [
 
 [[package]]
 name = "crossterm"
-version = "0.26.1"
+version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a84cda67535339806297f1b331d6dd6320470d2a0fe65381e79ee9e156dd3d13"
+checksum = "f476fe445d41c9e991fd07515a6f463074b782242ccf4a5b7b1d1012e70824df"
 dependencies = [
- "bitflags 1.3.2",
+ "bitflags 2.4.0",
  "crossterm_winapi",
  "libc",
  "mio",
@@ -316,18 +316,17 @@ dependencies = [
 
 [[package]]
 name = "dust-lang"
-version = "0.3.8"
+version = "0.3.9"
 dependencies = [
  "ansi_term",
  "cc",
  "clap",
- "comfy-table",
+ "crossterm",
  "csv",
- "git2",
  "rand",
+ "ratatui",
  "rayon",
  "reqwest",
- "rustyline",
  "serde",
  "serde_json",
  "toml",
@@ -349,12 +348,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "endian-type"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c34f04666d835ff5d62e058c3995147c06f42fe86ff053337632bca83e42702d"
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -382,33 +375,12 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "error-code"
-version = "2.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64f18991e7bf11e7ffee451b5318b5c1a73c52d0d0ada6e5a3017c8c1ced6a21"
-dependencies = [
- "libc",
- "str-buf",
-]
-
 [[package]]
 name = "fastrand"
 version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "25cbce373ec4653f1a01a31e8a5e5ec0c622dc27ff9c4e6606eefef5cbbed4a5"
 
-[[package]]
-name = "fd-lock"
-version = "3.0.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef033ed5e9bad94e55838ca0ca906db0e043f517adda0c8b79c7a8c66c93c1b5"
-dependencies = [
- "cfg-if",
- "rustix",
- "windows-sys",
-]
-
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -504,21 +476,6 @@ version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fb8d784f27acf97159b40fc4db5ecd8aa23b9ad5ef69cdd136d3bc80665f0c0"
 
-[[package]]
-name = "git2"
-version = "0.18.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fbf97ba92db08df386e10c8ede66a2a0369bd277090afd8710e19e38de9ec0cd"
-dependencies = [
- "bitflags 2.4.0",
- "libc",
- "libgit2-sys",
- "log",
- "openssl-probe",
- "openssl-sys",
- "url",
-]
-
 [[package]]
 name = "h2"
 version = "0.3.21"
@@ -549,6 +506,10 @@ name = "hashbrown"
 version = "0.14.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7dfda62a12f55daeae5015f81b0baea145391cb4520f86c248fc615d72640d12"
+dependencies = [
+ "ahash",
+ "allocator-api2",
+]
 
 [[package]]
 name = "heck"
@@ -562,15 +523,6 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d77f7ec81a6d05a3abb01ab6eb7590f6083d08449fe5a1c8b1e620283546ccb7"
 
-[[package]]
-name = "home"
-version = "0.5.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5444c27eef6923071f7ebcc33e3444508466a76f7a2b93da00ed6e19f30c1ddb"
-dependencies = [
- "windows-sys",
-]
-
 [[package]]
 name = "http"
 version = "0.2.9"
@@ -664,35 +616,41 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.0.2"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8adf3ddd720272c6ea8bf59463c04e0f93d0bbf7c5439b691bca2987e0270897"
+checksum = "d530e1a18b1cb4c484e6e34556a0d948706958449fca0cab753d649f2bce3d1f"
 dependencies = [
  "equivalent",
  "hashbrown 0.14.1",
 ]
 
+[[package]]
+name = "indoc"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e186cfbae8084e513daff4240b4797e342f988cecda4fb6c939150f96315fd8"
+
 [[package]]
 name = "ipnet"
 version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "28b29a3cd74f0f4598934efe3aeba42bae0eb4680554128851ebbecb02af14e6"
 
+[[package]]
+name = "itertools"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25db6b064527c5d482d0423354fcd07a89a2dfe07b67892e62411946db7f07b0"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
-[[package]]
-name = "jobserver"
-version = "0.1.26"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "js-sys"
 version = "0.3.64"
@@ -714,46 +672,6 @@ version = "0.2.148"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9cdc71e17332e86d2e1d38c1f99edcb6288ee11b815fb1a4b049eaa2114d369b"
 
-[[package]]
-name = "libgit2-sys"
-version = "0.16.1+1.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2a2bb3680b094add03bb3732ec520ece34da31a8cd2d633d1389d0f0fb60d0c"
-dependencies = [
- "cc",
- "libc",
- "libssh2-sys",
- "libz-sys",
- "openssl-sys",
- "pkg-config",
-]
-
-[[package]]
-name = "libssh2-sys"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dc8a030b787e2119a731f1951d6a773e2280c660f8ec4b0f5e1505a386e71ee"
-dependencies = [
- "cc",
- "libc",
- "libz-sys",
- "openssl-sys",
- "pkg-config",
- "vcpkg",
-]
-
-[[package]]
-name = "libz-sys"
-version = "1.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d97137b25e321a73eef1418d1d5d2eda4d77e12813f8e6dead84bc52c5870a7b"
-dependencies = [
- "cc",
- "libc",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.8"
@@ -776,6 +694,15 @@ version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
+[[package]]
+name = "lru"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2994eeba8ed550fd9b47a0b38f0242bc3344e496483c6180b69139cc2fa5d1d7"
+dependencies = [
+ "hashbrown 0.14.1",
+]
+
 [[package]]
 name = "memchr"
 version = "2.6.4"
@@ -836,26 +763,6 @@ dependencies = [
  "tempfile",
 ]
 
-[[package]]
-name = "nibble_vec"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77a5d83df9f36fe23f0c3648c6bbb8b0298bb5f1939c8f2704431371f4b84d43"
-dependencies = [
- "smallvec",
-]
-
-[[package]]
-name = "nix"
-version = "0.26.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "598beaf3cc6fdd9a5dfb1630c2800c7acd31df7aaf0f565796fba2b53ca1af1b"
-dependencies = [
- "bitflags 1.3.2",
- "cfg-if",
- "libc",
-]
-
 [[package]]
 name = "num_cpus"
 version = "1.16.0"
@@ -948,6 +855,12 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "paste"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.0"
@@ -996,16 +909,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "radix_trie"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c069c179fcdc6a2fe24d8d18305cf085fdbd4f922c041943e203685d6a1c58fd"
-dependencies = [
- "endian-type",
- "nibble_vec",
-]
-
 [[package]]
 name = "rand"
 version = "0.8.5"
@@ -1036,6 +939,25 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "ratatui"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5659e52e4ba6e07b2dad9f1158f578ef84a73762625ddb51536019f34d180eb"
+dependencies = [
+ "bitflags 2.4.0",
+ "cassowary",
+ "crossterm",
+ "indoc",
+ "itertools",
+ "lru",
+ "paste",
+ "stability",
+ "strum",
+ "unicode-segmentation",
+ "unicode-width",
+]
+
 [[package]]
 name = "rayon"
 version = "1.8.0"
@@ -1157,41 +1079,6 @@ version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc183a10b4478d04cbbbfc96d0873219d962dd5accaff2ffbd4ceb7df837f4"
 
-[[package]]
-name = "rustyline"
-version = "12.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "994eca4bca05c87e86e15d90fc7a91d1be64b4482b38cb2d27474568fe7c9db9"
-dependencies = [
- "bitflags 2.4.0",
- "cfg-if",
- "clipboard-win",
- "fd-lock",
- "home",
- "libc",
- "log",
- "memchr",
- "nix",
- "radix_trie",
- "rustyline-derive",
- "scopeguard",
- "unicode-segmentation",
- "unicode-width",
- "utf8parse",
- "winapi",
-]
-
-[[package]]
-name = "rustyline-derive"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a32af5427251d2e4be14fc151eabe18abb4a7aad5efee7044da9f096c906a43"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.37",
-]
-
 [[package]]
 name = "ryu"
 version = "1.0.15"
@@ -1269,9 +1156,9 @@ dependencies = [
 
 [[package]]
 name = "serde_spanned"
-version = "0.6.3"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96426c9936fd7a0124915f9185ea1d20aa9445cc9821142f0a73bc9207a2e186"
+checksum = "eb3622f419d1296904700073ea6cc23ad690adbd66f13ea683df73298736f0c1"
 dependencies = [
  "serde",
 ]
@@ -1354,10 +1241,14 @@ dependencies = [
 ]
 
 [[package]]
-name = "str-buf"
-version = "1.0.6"
+name = "stability"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e08d8363704e6c71fc928674353e6b7c23dcea9d82d7012c8faf2a3a025f8d0"
+checksum = "ebd1b177894da2a2d9120208c3386066af06a488255caabc5de8ddca22dbc3ce"
+dependencies = [
+ "quote",
+ "syn 1.0.109",
+]
 
 [[package]]
 name = "strsim"
@@ -1367,21 +1258,24 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "strum"
-version = "0.24.1"
+version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "063e6045c0e62079840579a7e47a355ae92f60eb74daaf156fb1e84ba164e63f"
+checksum = "290d54ea6f91c969195bdbcd7442c8c2a2ba87da8bf60a7ee86a235d4bc1e125"
+dependencies = [
+ "strum_macros",
+]
 
 [[package]]
 name = "strum_macros"
-version = "0.24.3"
+version = "0.25.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e385be0d24f186b4ce2f9982191e7101bb737312ad61c1f2f984f34bcf85d59"
+checksum = "23dc1fa9ac9c169a78ba62f0b841814b7abae11bdd047b9c58f893439e309ea0"
 dependencies = [
  "heck",
  "proc-macro2",
  "quote",
  "rustversion",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
@@ -1497,9 +1391,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.8.2"
+version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "185d8ab0dfbb35cf1399a6344d8484209c088f75f8f68230da55d48d95d43e3d"
+checksum = "a1a195ec8c9da26928f773888e0742ca3ca1040c6cd859c919c9f59c1954ab35"
 dependencies = [
  "serde",
  "serde_spanned",
@@ -1509,20 +1403,20 @@ dependencies = [
 
 [[package]]
 name = "toml_datetime"
-version = "0.6.3"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7cda73e2f1397b1262d6dfdcef8aafae14d1de7748d66822d3bfeeb6d03e5e4b"
+checksum = "3550f4e9685620ac18a50ed434eb3aec30db8ba93b0287467bca5826ea25baf1"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "toml_edit"
-version = "0.20.2"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "396e4d48bbb2b7554c944bde63101b5ae446cff6ec4a24227428f15eb72ef338"
+checksum = "d34d383cd00a163b4a5b85053df514d45bc330f6de7737edfe0a93311d1eaa03"
 dependencies = [
- "indexmap 2.0.2",
+ "indexmap 2.1.0",
  "serde",
  "serde_spanned",
  "toml_datetime",
@@ -1627,6 +1521,12 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
 [[package]]
 name = "want"
 version = "0.3.1"
@@ -1808,9 +1708,9 @@ checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 
 [[package]]
 name = "winnow"
-version = "0.5.15"
+version = "0.5.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c2e3184b9c4e92ad5167ca73039d0c42476302ab603e2fec4487511f38ccefc"
+checksum = "9b5c3db89721d50d0e2a673f5043fc4722f76dcc352d7b1ab8b8288bed4ed2c5"
 dependencies = [
  "memchr",
 ]
@@ -1824,3 +1724,23 @@ dependencies = [
  "cfg-if",
  "windows-sys",
 ]
+
+[[package]]
+name = "zerocopy"
+version = "0.7.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74d4d3961e53fa4c9a25a8637fc2bfaf2595b3d3ae34875568a5cf64787716be"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.37",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 8ea6bed..58ad2a5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,16 +18,15 @@ opt-level = 3
 [dependencies]
 ansi_term = "0.12.1"
 clap = { version = "4.4.4", features = ["derive"] }
-comfy-table = "7.0.1"
-csv = "1.2.2"
-git2 = "0.18.1"
+crossterm = "0.27.0"
+csv = "1.3.0"
 rand = "0.8.5"
+ratatui = "0.25.0"
 rayon = "1.8.0"
 reqwest = { version = "0.11.20", features = ["blocking", "json"] }
-rustyline = { version = "12.0.0", features = ["derive", "with-file-history"] }
 serde = { version = "1.0.188", features = ["derive"] }
 serde_json = "1.0.107"
-toml = "0.8.1"
+toml = "0.8.8"
 tree-sitter = "0.20.10"
 
 [build-dependencies]
diff --git a/src/main.rs b/src/main.rs
index 479e192..765faf4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,18 +1,16 @@
 //! Command line interface for the dust programming language.
 use clap::Parser;
-use rustyline::{
-    completion::FilenameCompleter,
-    error::ReadlineError,
-    highlight::Highlighter,
-    hint::{Hint, Hinter, HistoryHinter},
-    history::DefaultHistory,
-    Completer, Context, Editor, Helper, Validator,
+use crossterm::{
+    event::{self, KeyCode, KeyEventKind},
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+    ExecutableCommand,
 };
+use ratatui::{prelude::CrosstermBackend, style::Stylize, widgets::Paragraph, Terminal};
 use tree_sitter::Parser as TSParser;
 
-use std::{borrow::Cow, fs::read_to_string};
+use std::{fs::read_to_string, io::stdout};
 
-use dust_lang::{evaluate_with_context, language, Interpreter, Map, Value};
+use dust_lang::{language, Interpreter, Map, Result, Value};
 
 /// Command-line arguments to be parsed.
 #[derive(Parser, Debug)]
@@ -46,7 +44,7 @@ fn main() {
     let args = Args::parse();
 
     if args.path.is_none() && args.command.is_none() {
-        return run_cli_shell();
+        return run_cli_shell().unwrap();
     }
 
     let source = if let Some(path) = &args.path {
@@ -102,111 +100,37 @@ fn main() {
     }
 }
 
-#[derive(Helper, Completer, Validator)]
-struct DustReadline {
-    #[rustyline(Completer)]
-    completer: FilenameCompleter,
+fn run_cli_shell() -> Result<()> {
+    let mut _context = Map::new();
 
-    tool_hints: Vec<ToolHint>,
+    stdout().execute(EnterAlternateScreen)?;
+    enable_raw_mode()?;
 
-    #[rustyline(Hinter)]
-    _hinter: HistoryHinter,
-}
-
-impl DustReadline {
-    fn new() -> Self {
-        Self {
-            completer: FilenameCompleter::new(),
-            _hinter: HistoryHinter {},
-            tool_hints: Vec::new(),
-        }
-    }
-}
-
-struct ToolHint {
-    display: String,
-    complete_to: usize,
-}
-
-impl Hint for ToolHint {
-    fn display(&self) -> &str {
-        &self.display
-    }
-
-    fn completion(&self) -> Option<&str> {
-        if self.complete_to > 0 {
-            Some(&self.display[..self.complete_to])
-        } else {
-            None
-        }
-    }
-}
-
-impl ToolHint {
-    fn suffix(&self, strip_chars: usize) -> ToolHint {
-        ToolHint {
-            display: self.display[strip_chars..].to_string(),
-            complete_to: self.complete_to.saturating_sub(strip_chars),
-        }
-    }
-}
-
-impl Hinter for DustReadline {
-    type Hint = ToolHint;
-
-    fn hint(&self, line: &str, pos: usize, _ctx: &Context<'_>) -> Option<Self::Hint> {
-        if line.is_empty() || pos < line.len() {
-            return None;
-        }
-
-        self.tool_hints.iter().find_map(|tool_hint| {
-            if tool_hint.display.starts_with(line) {
-                Some(tool_hint.suffix(pos))
-            } else {
-                None
-            }
-        })
-    }
-}
-
-impl Highlighter for DustReadline {
-    fn highlight_hint<'h>(&self, hint: &'h str) -> std::borrow::Cow<'h, str> {
-        let highlighted = ansi_term::Colour::Red.paint(hint).to_string();
-
-        Cow::Owned(highlighted)
-    }
-}
-
-fn run_cli_shell() {
-    let mut context = Map::new();
-    let mut rl: Editor<DustReadline, DefaultHistory> = Editor::new().unwrap();
-
-    rl.set_helper(Some(DustReadline::new()));
-
-    if rl.load_history("target/history.txt").is_err() {
-        println!("No previous history.");
-    }
+    let mut terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
 
     loop {
-        let readline = rl.readline("* ");
-        match readline {
-            Ok(line) => {
-                let line = line.as_str();
+        terminal.draw(|frame| {
+            let area = frame.size();
+            frame.render_widget(
+                Paragraph::new("Hello Ratatui! (press 'q' to quit)")
+                    .white()
+                    .on_blue(),
+                area,
+            );
+        })?;
 
-                rl.add_history_entry(line).unwrap();
-
-                let eval_result = evaluate_with_context(line, &mut context);
-
-                match eval_result {
-                    Ok(value) => println!("{value}"),
-                    Err(error) => eprintln!("{error}"),
+        if event::poll(std::time::Duration::from_millis(16))? {
+            if let event::Event::Key(key) = event::read()? {
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
+                    break;
                 }
             }
-            Err(ReadlineError::Interrupted) => break,
-            Err(ReadlineError::Eof) => break,
-            Err(error) => eprintln!("{error}"),
         }
     }
 
-    rl.save_history("target/history.txt").unwrap();
+    terminal.clear()?;
+    stdout().execute(LeaveAlternateScreen)?;
+    disable_raw_mode()?;
+
+    Ok(())
 }