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use std::collections::HashMap;
use std::error::Error;
use std::path::PathBuf;
use log::LevelFilter;
use serde::Deserialize;
use toml::Value;
pub trait SerdeReplace {
fn replace(&mut self, value: Value) -> Result<(), Box<dyn Error>>;
}
#[macro_export]
macro_rules! impl_replace {
($($ty:ty),*$(,)*) => {
$(
impl SerdeReplace for $ty {
fn replace(&mut self, value: Value) -> Result<(), Box<dyn Error>> {
replace_simple(self, value)
}
}
)*
};
}
#[rustfmt::skip]
impl_replace!(
usize, u8, u16, u32, u64, u128,
isize, i8, i16, i32, i64, i128,
f32, f64,
bool,
char,
String,
PathBuf,
LevelFilter,
);
fn replace_simple<'de, D>(data: &mut D, value: Value) -> Result<(), Box<dyn Error>>
where
D: Deserialize<'de>,
{
*data = D::deserialize(value)?;
Ok(())
}
impl<'de, T: Deserialize<'de>> SerdeReplace for Vec<T> {
fn replace(&mut self, value: Value) -> Result<(), Box<dyn Error>> {
replace_simple(self, value)
}
}
impl<'de, T: SerdeReplace + Deserialize<'de>> SerdeReplace for Option<T> {
fn replace(&mut self, value: Value) -> Result<(), Box<dyn Error>> {
match self {
Some(inner) => inner.replace(value),
None => replace_simple(self, value),
}
}
}
impl<'de, T: Deserialize<'de>> SerdeReplace for HashMap<String, T> {
fn replace(&mut self, value: Value) -> Result<(), Box<dyn Error>> {
replace_simple(self, value)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate as alacritty_config;
use alacritty_config_derive::ConfigDeserialize;
#[test]
fn replace_option() {
#[derive(ConfigDeserialize, Default, PartialEq, Eq, Debug)]
struct ReplaceOption {
a: usize,
b: usize,
}
let mut subject: Option<ReplaceOption> = None;
let value: Value = toml::from_str("a=1").unwrap();
SerdeReplace::replace(&mut subject, value).unwrap();
let value: Value = toml::from_str("b=2").unwrap();
SerdeReplace::replace(&mut subject, value).unwrap();
assert_eq!(subject, Some(ReplaceOption { a: 1, b: 2 }));
}
}
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