aliasman 1.2.0

A simple tool for manage your aliasses
Documentation 
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use anyhow::Result;
use std::fs::{File, OpenOptions};

/// Open a file with r/w permissions
/// if not exist error
/// # Errors
/// Error if fail on open options
pub fn open_file(file: &str) -> Result<File> {
    Ok(OpenOptions::new()
        .truncate(false)
        .write(true)
        .read(true)
        .create(true)
        .open(file)?)
}

/// Open a file in add mode
/// if not exist error
/// # Errors
/// Error if fail on open options
pub fn mod_file(file: &str) -> Result<File> {
    Ok(OpenOptions::new().append(true).open(file)?)
}

/// Open a file in w mode
/// if not exist is created
/// # Errors
/// Error if fail on open options
pub fn truncate_file(file: &str) -> Result<File> {
    Ok(OpenOptions::new()
        .create(true)
        .truncate(true)
        .write(true)
        .open(file)?)
}

/// Open a file in r mode
/// if not exist error
/// # Errors
/// Error if fail on open options
pub fn onlyread_file(file: &str) -> Result<File> {
    Ok(OpenOptions::new().read(true).open(file)?)
}

/// If the file not exist, is created
/// # Errors
/// Error if fail on open options
pub fn create_file(file: &str) -> Result<()> {
    open_file(file)?;
    Ok(())
}

/// Getting the size of a file from his metadata
/// # Panics
/// Panic if conversion on uszie from u64 fail
pub fn get_file_size(f: &File) -> Option<usize> {
    f.metadata()
        .map(|m| usize::try_from(m.len()).expect("Error on u64 -> usize convertion"))
        .ok()
}