feat: use std::cell::OnceLock instead of the once_cell crate, require…

…s bumping MSRV to Rust 1.71

.github/workflows/rust.yml

@@ -8,7 +8,7 @@ jobs:
  strategy:
  matrix:
  toolchain: 
- - "1.65" # MSRV
+ - "1.71" # MSRV
  - stable
  - beta
  - nightly

Cargo.toml

@@ -11,14 +11,13 @@ keywords = ["excel", "ods", "xls", "xlsx", "xlsb"]
 categories = ["encoding", "parsing", "text-processing"]
 exclude = ["tests/**/*"]
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.71"
 
 [dependencies]
-byteorder = "1.4"
+byteorder = "1.5"
 codepage = "0.1.1"
 encoding_rs = "0.8"
 log = "0.4"
-once_cell = { version = "1.18", optional = true }
 serde = "1.0"
 quick-xml = { version = "0.31", features = ["encoding"] }
 zip = { version = "0.6", default-features = false, features = ["deflate"] }
@@ -28,11 +27,11 @@ chrono = { version = "0.4", features = [
 
 [dev-dependencies]
 glob = "0.3"
-env_logger = "0.10"
+env_logger = "0.11"
 serde_derive = "1.0"
 sha256 = "1.3"
 
 [features]
 default = []
-dates = ["chrono", "once_cell"]
+dates = ["chrono"]
 picture = []

src/datatype.rs

@@ -1,14 +1,14 @@
 use std::fmt;
-
 #[cfg(feature = "dates")]
-use once_cell::sync::OnceCell;
+use std::sync::OnceLock;
+
 use serde::de::Visitor;
 use serde::{self, Deserialize};
 
 use super::CellErrorType;
 
 #[cfg(feature = "dates")]
-static EXCEL_EPOCH: OnceCell<chrono::NaiveDateTime> = OnceCell::new();
+static EXCEL_EPOCH: OnceLock<chrono::NaiveDateTime> = OnceLock::new();
 
 #[cfg(feature = "dates")]
 /// https://learn.microsoft.com/en-us/office/troubleshoot/excel/1900-and-1904-date-system

src/xls.rs

@@ -747,10 +747,10 @@ fn parse_label(
  let row = read_u16(r);
  let col = read_u16(&r[2..]);
  let _ixfe = read_u16(&r[4..]);
- return Ok(Some(Cell::new(
+ Ok(Some(Cell::new(
  (row as u32, col as u32),
  Data::String(parse_string(&r[6..], encoding, biff)?),
- )));
+ )))
 }
 
 fn parse_label_sst(r: &[u8], strings: &[String]) -> Result<Option<Cell<Data>>, XlsError> {