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//! Utility functions.

use std::path::PathBuf;

/// Returns a path for a given file, searching through PATH to find it.
pub fn get_from_path(exe_name: &str) -> Option<PathBuf> {
    std::env::var_os("PATH").and_then(|paths| {
        std::env::split_paths(&paths).find_map(|dir| {
            let bash_path = dir.join(exe_name);
            if bash_path.is_file() {
                Some(bash_path)
            } else {
                None
            }
        })
    })
}

/// Returns the path to a shell suitable for running hooks.
pub fn get_sh() -> Option<PathBuf> {
    let exe_name = if cfg!(target_os = "windows") {
        "bash.exe"
    } else {
        "sh"
    };
    // If we are on Windows, first look for git.exe, and try to use it's bash, otherwise it won't
    // be able to find git-branchless correctly.
    if cfg!(target_os = "windows") {
        // Git is typically installed at C:\Program Files\Git\cmd\git.exe with the cmd\ directory
        // in the path, however git-bash is usually not in PATH and is in bin\ directory:
        let git_path = get_from_path("git.exe").expect("Couldn't find git.exe");
        let git_dir = git_path.parent().unwrap().parent().unwrap();
        let git_bash = git_dir.join("bin").join(exe_name);
        if git_bash.is_file() {
            return Some(git_bash);
        }
    }
    get_from_path(exe_name)
}