headless_lms_utils/
icu4x.rs

1use std::fmt::Debug;
2
3use anyhow::Context;
4use once_cell::sync::OnceCell;
5
6static ICU4X_POSTCARD: OnceCell<Vec<u8>> = OnceCell::new();
7
8#[derive(Clone, Copy)]
9pub struct Icu4xBlob {
10    postcard: &'static [u8],
11}
12
13impl Icu4xBlob {
14    pub fn new(icu4x_postcard_path: &str) -> anyhow::Result<Self> {
15        let data = ICU4X_POSTCARD.get_or_try_init(|| {
16            let postcard = std::fs::read(icu4x_postcard_path).with_context(|| {
17                format!("could not read icu4x postcard from {icu4x_postcard_path}")
18            })?;
19            anyhow::Ok(postcard)
20        })?;
21
22        Ok(Self {
23            postcard: data.as_slice(),
24        })
25    }
26
27    /// Tries to init from env
28    pub fn try_from_env() -> anyhow::Result<Self> {
29        let icu4x_postcard_path =
30            std::env::var("ICU4X_POSTCARD_PATH").context("ICU4X_POSTCARD_PATH not defined")?;
31        Self::new(&icu4x_postcard_path)
32    }
33
34    pub fn get(&self) -> &'static [u8] {
35        self.postcard
36    }
37}
38
39impl Debug for Icu4xBlob {
40    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
41        write!(f, "Icu4xBlob")
42    }
43}
headless_lms_utils/icu4x.rs

headless_lms_utils/
icu4x.rs
