dcr 0.8.3

// DCR — Cargo-like C/C++ project manager.
//
// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
//
// This program 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.
//
// This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.

use std::io;
use std::path::{Path, PathBuf};

pub fn home_dir() -> Option<PathBuf> {
    if let Ok(home) = std::env::var("HOME") {
        return Some(PathBuf::from(home));
    }
    if let Ok(profile) = std::env::var("USERPROFILE") {
        return Some(PathBuf::from(profile));
    }
    None
}

pub fn to_hex(bytes: &[u8]) -> String {
    let mut out = String::with_capacity(bytes.len() * 2);
    for b in bytes {
        out.push_str(&format!("{:02x}", b));
    }
    out
}

#[allow(dead_code)]
pub fn check_dir(dir: Option<&str>) -> io::Result<Vec<String>> {
    let path: PathBuf = match dir {
        None | Some(".") | Some("./") => std::env::current_dir()?,
        Some(value) => std::env::current_dir()?.join(value),
    };

    let mut items = Vec::new();
    for entry in std::fs::read_dir(path)? {
        let entry = entry?;
        items.push(entry.file_name().to_string_lossy().to_string());
    }

    Ok(items)
}

pub fn find_project_root(start: &Path) -> io::Result<Option<PathBuf>> {
    let mut current = start.to_path_buf();
    loop {
        if current.join("dcr.toml").is_file() {
            return Ok(Some(current));
        }
        if !current.pop() {
            break;
        }
    }
    Ok(None)
}

pub fn with_dir<F, T>(dir: &Path, f: F) -> Result<T, String>
where
    F: FnOnce() -> Result<T, String>,
{
    let prev = std::env::current_dir().map_err(|_| "Failed to get current dir".to_string())?;
    std::env::set_current_dir(dir).map_err(|_| "Failed to change directory".to_string())?;
    let result = f();
    let _ = std::env::set_current_dir(prev);
    result
}