diff options
| -rw-r--r-- | crates/typst-utils/src/lib.rs | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/crates/typst-utils/src/lib.rs b/crates/typst-utils/src/lib.rs index abe6423d..4cfe0c04 100644 --- a/crates/typst-utils/src/lib.rs +++ b/crates/typst-utils/src/lib.rs @@ -23,7 +23,7 @@ pub use self::scalar::Scalar; #[doc(hidden)] pub use once_cell; -use std::fmt::{Debug, Formatter}; +use std::fmt::{Debug, Display, Formatter}; use std::hash::Hash; use std::iter::{Chain, Flatten, Rev}; use std::num::{NonZeroU32, NonZeroUsize}; @@ -52,6 +52,25 @@ where Wrapper(f) } +/// Turn a closure into a struct implementing [`Display`]. +pub fn display<F>(f: F) -> impl Display +where + F: Fn(&mut Formatter) -> std::fmt::Result, +{ + struct Wrapper<F>(F); + + impl<F> Display for Wrapper<F> + where + F: Fn(&mut Formatter) -> std::fmt::Result, + { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + self.0(f) + } + } + + Wrapper(f) +} + /// Calculate a 128-bit siphash of a value. pub fn hash128<T: Hash + ?Sized>(value: &T) -> u128 { let mut state = SipHasher13::new(); |