Split it up into two parts: library and cli binary

.gitignore

@@ -1 +1,2 @@
-/target
+*/target
+lek/Cargo.lock

lek/Cargo.toml

@@ -11,8 +11,5 @@ panic = "abort"
 #incremental = false
 
 [dependencies]
-rustyline = "6.1.2"
 phf = { version = "0.8", features = ["macros"] }
-ansi_term = "0.12"
-bigdecimal = "0.1.2"
 rug = "1.9.0"

lek/src/ast.rs

@@ -1,4 +1,5 @@
 use crate::lexer::TokenKind;
+use crate::parser::Unit;
 use std::mem;
 
 #[derive(Debug, Clone)]
@@ -19,12 +20,6 @@ pub enum Expr {
     Literal(String),
 }
 
-#[derive(Debug, Clone)]
-pub enum Unit {
-    Radians,
-    Degrees,
-}
-
 impl TokenKind {
     pub fn is_unit(&self) -> bool {
         match self {

lek/src/interpreter.rs

@@ -1,5 +1,6 @@
-use crate::ast::{compare_enums, Expr, Stmt, Unit};
+use crate::ast::{compare_enums, Expr, Stmt};
 use crate::lexer::TokenKind;
+use crate::parser::Unit;
 use crate::prelude;
 use crate::symbol_table::SymbolTable;
 use rug::ops::Pow;

lek/src/lib.rs

@@ -0,0 +1,6 @@
+mod ast;
+mod interpreter;
+mod lexer;
+pub mod parser;
+mod prelude;
+mod symbol_table;

lek/src/parser.rs

@@ -1,5 +1,5 @@
 use crate::{
-    ast::{compare_enums, Expr, Stmt, Unit},
+    ast::{compare_enums, Expr, Stmt},
     interpreter,
     lexer::{Lexer, Token, TokenKind},
     symbol_table::SymbolTable,
@@ -12,6 +12,11 @@ pub struct Context {
     pos: usize,
     symbol_table: SymbolTable,
 }
+#[derive(Debug, Clone)]
+pub enum Unit {
+    Radians,
+    Degrees,
+}
 
 impl Context {
     pub fn new() -> Self {

lek/src/prelude.rs

@@ -11,7 +11,7 @@ pub const CONSTANTS: phf::Map<&'static str, &'static str> = phf::phf_map! {
     "ϕ" => "1.61803398",
 };
 
-use crate::ast::Unit;
+use crate::parser::Unit;
 use funcs::*;
 pub const UNARY_FUNCS: phf::Map<&'static str, UnaryFuncInfo> = phf::phf_map! {
     "cos" => UnaryFuncInfo(cos, Trig),
@@ -161,6 +161,7 @@ mod funcs {
     pub fn acot(x: Float) -> Float {
         (1f64 / x).atan()
     }
+
     pub fn acoth(x: Float) -> Float {
         (1f64 / x).atanh()
     }

lek_cli/Cargo.lock

@@ -39,17 +39,6 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b41b7ea54a0c9d92199de89e20e58d49f02f8e699814ef3fdf266f6f748d15c7"
 
-[[package]]
-name = "bigdecimal"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1374191e2dd25f9ae02e3aa95041ed5d747fc77b3c102b49fe2dd9a8117a6244"
-dependencies = [
- "num-bigint",
- "num-integer",
- "num-traits",
-]
-
 [[package]]
 name = "bitflags"
 version = "1.2.1"
@@ -149,10 +138,16 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 name = "lek"
 version = "0.1.0"
 dependencies = [
- "ansi_term",
- "bigdecimal",
  "phf",
  "rug",
+]
+
+[[package]]
+name = "lek_cli"
+version = "0.1.0"
+dependencies = [
+ "ansi_term",
+ "lek",
  "rustyline",
 ]
 
@@ -190,36 +185,6 @@ dependencies = [
  "void",
 ]
 
-[[package]]
-name = "num-bigint"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "090c7f9998ee0ff65aa5b723e4009f7b217707f1fb5ea551329cc4d6231fb304"
-dependencies = [
- "autocfg",
- "num-integer",
- "num-traits",
-]
-
-[[package]]
-name = "num-integer"
-version = "0.1.42"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f6ea62e9d81a77cd3ee9a2a5b9b609447857f3d358704331e4ef39eb247fcba"
-dependencies = [
- "autocfg",
- "num-traits",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c62be47e61d1842b9170f0fdeec8eba98e60e90e5446449a0545e5152acd7096"
-dependencies = [
- "autocfg",
-]
-
 [[package]]
 name = "phf"
 version = "0.8.0"
@@ -278,9 +243,9 @@ checksum = "7e0456befd48169b9f13ef0f0ad46d492cf9d2dbb918bcf38e01eed4ce3ec5e4"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.17"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1502d12e458c49a4c9cbff560d0fe0060c252bc29799ed94ca2ed4bb665a0101"
+checksum = "beae6331a816b1f65d04c45b078fd8e6c93e8071771f41b8163255bbd8d7c8fa"
 dependencies = [
  "unicode-xid",
 ]
@@ -418,9 +383,9 @@ checksum = "fa8f3741c7372e75519bd9346068370c9cdaabcc1f9599cbcf2a2719352286b7"
 
 [[package]]
 name = "syn"
-version = "1.0.28"
+version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7e33a62f20d3dc02a1bc9c1d385f92b459bbf35e4dc325eed20c53db5b90c03"
+checksum = "93a56fabc59dce20fe48b6c832cc249c713e7ed88fa28b0ee0a3bfcaae5fe4e2"
 dependencies = [
  "proc-macro2",
  "quote",

lek_cli/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "lek_cli"
+version = "0.1.0"
+authors = ["PaddiM8 <paddim8@pm.me>"]
+edition = "2018"
+
+[profile.release]
+panic = "abort"
+
+[dependencies]
+lek = { path = "../lek" }
+rustyline = "6.1.2"
+ansi_term = "0.12"

lek_cli/src/main.rs

@@ -1,16 +1,8 @@
-use std::{env, process};
-
-mod ast;
-mod interpreter;
-mod lexer;
-mod parser;
-mod prelude;
-mod symbol_table;
-
 use ansi_term::Colour::{Cyan, Red};
-use ast::Unit;
+use lek::parser::{self, Unit};
 use rustyline::error::ReadlineError;
 use rustyline::Editor;
+use std::{env, process};
 
 fn main() {
     let mut parser = parser::Context::new();