// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity Ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

//! Directory helper functions
use home_dir;

/// Replaces `$HOME` str with home directory path.
pub fn replace_home(base: &str, arg: &str) -> String {
    // the $HOME directory on mac os should be `~/Library` or `~/Library/Application Support`
    // We use an `if` so that we don't need to call `home_dir()` if not necessary.
    let r = if arg.contains("$HOME") {
        arg.replace(
            "$HOME",
            home_dir().expect("$HOME isn't defined").to_str().unwrap(),
        )
    } else {
        arg.to_owned()
    };
    let r = r.replace("$BASE", base);
    r.replace("/", &::std::path::MAIN_SEPARATOR.to_string())
}

/// Replaces `$HOME` str with home directory path and `$LOCAL` with local path.
pub fn replace_home_and_local(base: &str, local: &str, arg: &str) -> String {
    let r = replace_home(base, arg);
    r.replace("$LOCAL", local)
}