chug-cli 0.1.3

The fastest way to consume Homebrew bottles
Documentation 
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use std::{
    env, fs,
    path::{Path, PathBuf},
};

use anyhow::Context;

const PROGRAM_NAME: &str = "chug";

fn home_dir() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        let path = env::var("HOME").context("$HOME not set")?;
        Ok(path.into())
    })?;
    Ok(path)
}

pub fn bin_dir() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        // XDG_BIN_HOME is not a standard, but some people use it
        // https://gist.github.com/roalcantara/107ba66dfa3b9d023ac9329e639bc58c
        let path = if let Ok(xdg_dir) = env::var("XDG_BIN_HOME") {
            PathBuf::from(xdg_dir)
        } else {
            home_dir()?.join(".local/bin")
        };

        fs::create_dir_all(&path).expect("Could not create bin dir");

        Ok(path)
    })?;
    Ok(path)
}

pub fn cache_dir() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        let mut path = if let Ok(xdg_dir) = env::var("XDG_CACHE_HOME") {
            PathBuf::from(xdg_dir)
        } else {
            home_dir()?.join(".cache")
        };
        path.push(PROGRAM_NAME);

        fs::create_dir_all(&path).expect("Could not create cache dir");

        Ok(path)
    })?;
    Ok(path)
}

pub fn data_dir() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        let mut path = if let Ok(xdg_dir) = env::var("XDG_DATA_HOME") {
            PathBuf::from(xdg_dir)
        } else {
            home_dir()?.join(".local/share")
        };
        path.push(PROGRAM_NAME);

        fs::create_dir_all(&path).expect("Could not create data dir");

        Ok(path)
    })?;
    Ok(path)
}

pub fn bottles_dir() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        let path = data_dir()?.join("bottles");

        fs::create_dir_all(&path).expect("Could not create bottles dir");

        Ok(path)
    })?;
    Ok(path)
}

pub fn etc_dir() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        let path = data_dir()?.join("etc");

        fs::create_dir_all(&path).expect("Could not create etc dir");

        Ok(path)
    })?;
    Ok(path)
}

pub fn opt_dir() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        let path = data_dir()?.join("opt");

        fs::create_dir_all(&path).expect("Could not create opt dir");

        Ok(path)
    })?;
    Ok(path)
}

pub fn db_file() -> anyhow::Result<&'static Path> {
    let path = cache!(PathBuf).get_or_init(|| {
        let path = data_dir()?.join("db.sqlite");
        Ok(path)
    })?;
    Ok(path)
}