Make malachite-bigint an optional dependency for rustpython-format

format/Cargo.toml

@@ -12,5 +12,6 @@ rustpython-literal = { workspace = true }
 
 bitflags = "2.3.1"
 itertools = "0.10.5"
-malachite-bigint = { workspace = true }
 num-traits = { workspace = true }
+num-bigint = { workspace = true, optional = true }
+malachite-bigint = { workspace = true, optional = true }

format/src/cformat.rs

@@ -1,7 +1,6 @@
 //! Implementation of Printf-Style string formatting
 //! as per the [Python Docs](https://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting).
 use bitflags::bitflags;
-use malachite_bigint::{BigInt, Sign};
 use num_traits::Signed;
 use rustpython_literal::{float, format::Case};
 use std::{
@@ -10,6 +9,8 @@ use std::{
     str::FromStr,
 };
 
+use crate::bigint::{BigInt, Sign};
+
 #[derive(Debug, PartialEq)]
 pub enum CFormatErrorType {
     UnmatchedKeyParentheses,

format/src/format.rs

@@ -1,12 +1,13 @@
 use itertools::{Itertools, PeekingNext};
-use malachite_bigint::{BigInt, Sign};
-use num_traits::FromPrimitive;
-use num_traits::{cast::ToPrimitive, Signed};
+
+use num_traits::{cast::ToPrimitive, FromPrimitive, Signed};
 use rustpython_literal::float;
 use rustpython_literal::format::Case;
 use std::ops::Deref;
 use std::{cmp, str::FromStr};
 
+use crate::bigint::{BigInt, Sign};
+
 trait FormatParse {
     fn parse(text: &str) -> (Option<Self>, &str)
     where

format/src/lib.rs

@@ -1,4 +1,9 @@
-pub mod cformat;
-mod format;
+#[cfg(feature = "malachite-bigint")]
+pub use malachite_bigint as bigint;
+#[cfg(feature = "num-bigint")]
+pub use num_bigint as bigint;
 
 pub use crate::format::*;
+
+pub mod cformat;
+mod format;