rw-builder 0.0.1

Provides a convenient way to build `std::io::Read`ers and `std::io::Write`rs by chaining transformations
Documentation 
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use std::{fs::OpenOptions, path::PathBuf};

use anyhow::Result;

use crate::RwBuilder;

/// Type for building readers and writers on top of a file handle.
/// It is itself an `RwBuilder`, but can't be created through one.
/// This is why we call it a source.
#[derive(Debug)]
pub struct Builder {
    /// The path of the file for which readers and writers can be created.
    path: PathBuf,
}

impl Builder {
    /// Factory function to create a builder holding on to a file path
    #[must_use]
    pub const fn new(path: PathBuf) -> Self {
        Self { path }
    }
}

impl RwBuilder for Builder {
    type Reader = std::fs::File;
    type Writer = std::fs::File;

    fn reader(&self) -> Result<Self::Reader> {
        let options = OpenOptions::new().read(true).open(&self.path)?;
        Ok(options)
    }

    fn writer(&self) -> Result<Self::Writer> {
        let options = OpenOptions::new().create(true).write(true).open(&self.path)?;
        Ok(options)
    }
}