rhq-core 0.2.9

Core library for rhq
Documentation 
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//! Defines configuration file format.

use std::env;
use std::fs;
use std::io::{Read, Write};
use std::ops::Deref;
use std::path::{Path, PathBuf};
use serde::{Deserialize, Serialize};
use toml;

lazy_static! {
  static ref CONFIG_PATH: PathBuf = {
    env::home_dir().unwrap().join(".config/rhq/config.toml")
  };
}

pub trait InitialStr {
    fn initial_str() -> &'static str;
}

/// configuration load from config files
#[derive(Debug, Serialize, Deserialize)]
pub struct Config<T> {
    inner: T,
}

impl<T> Config<T>
where
    for<'de> T: Serialize + Deserialize<'de> + InitialStr,
{
    pub fn load() -> ::Result<Self> {
        let path: &Path = CONFIG_PATH.as_ref();

        if !path.is_file() {
            debug!("Saving default config into ~/.config/rhq/config.toml...");
            let content = T::initial_str();
            fs::create_dir_all(path.parent().unwrap())?;
            fs::OpenOptions::new()
                .write(true)
                .create(true)
                .truncate(true)
                .open(&path)?
                .write_all(content.as_bytes())?;
        }

        debug!("Read content from ~/.config/rhq/config.toml...");
        let mut content = String::new();
        fs::File::open(path)?.read_to_string(&mut content)?;

        debug!("Deserialize config file...");
        let inner = toml::from_str(&content)?;

        Ok(Config { inner: inner })
    }
}

impl<T> Deref for Config<T> {
    type Target = T;
    fn deref(&self) -> &T {
        &self.inner
    }
}