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Merge pull request #83 from diniamo/cache-choices
feat: cache choices
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Original file line number | Diff line number | Diff line change |
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use std::{collections::HashMap, error::Error, fs, path::PathBuf}; | ||
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use bitcode::{Decode, Encode}; | ||
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#[derive(Encode, Decode)] | ||
struct CacheData(HashMap<String, String>); | ||
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pub struct Cache { | ||
path: PathBuf, | ||
data: CacheData, | ||
update: bool, | ||
} | ||
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impl Cache { | ||
pub fn new() -> Result<Self, Box<dyn Error>> { | ||
let path = xdg::BaseDirectories::new()?.place_state_file("comma-choices")?; | ||
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Ok(Self { | ||
data: if path.exists() { | ||
let bytes = fs::read(&path)?; | ||
bitcode::decode(&bytes)? | ||
} else { | ||
CacheData(HashMap::new()) | ||
}, | ||
path, | ||
update: false, | ||
}) | ||
} | ||
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pub fn query(&self, command: &str) -> Option<String> { | ||
self.data.0.get(command).cloned() | ||
} | ||
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pub fn update(&mut self, command: &str, derivation: &str) { | ||
self.data.0.insert(command.into(), derivation.into()); | ||
self.update = true; | ||
} | ||
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pub fn delete(&mut self, command: &str) { | ||
self.data.0.remove(command); | ||
self.update = true; | ||
} | ||
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pub fn empty(&mut self) { | ||
self.data.0.clear(); | ||
self.update = true; | ||
} | ||
} | ||
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impl Drop for Cache { | ||
fn drop(&mut self) { | ||
if self.update { | ||
let bytes = bitcode::encode(&self.data.0); | ||
if let Err(e) = fs::write(&self.path, bytes) { | ||
eprintln!("failed to write cache: {e}"); | ||
} | ||
} | ||
} | ||
} |
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