blubat-core 0.4.0

Bluetooth battery model, macOS data sources and polling engine behind the blubat CLI
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use std::fmt;
use std::path::PathBuf;

/// Everything blubat-core can fail at.
#[derive(Debug)]
pub enum Error {
    /// A macOS helper command could not be run, or ran and reported failure.
    Command(String),
    /// Data did not match the shape blubat expects, reading it or writing it.
    Format(String),
    /// A file under the blubat state directory could not be read or written.
    Io {
        path: PathBuf,
        source: std::io::Error,
    },
    /// A blubat directory could not be resolved.
    Path(String),
}

pub type Result<T> = std::result::Result<T, Error>;

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Error::Command(message) | Error::Format(message) | Error::Path(message) => {
                f.write_str(message)
            }
            Error::Io { path, source } => write!(f, "{}: {source}", path.display()),
        }
    }
}

// No `source`: the io failure is already in the `Display` text, and offering it
// twice makes anything walking the chain print it twice.
impl std::error::Error for Error {}