// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use std::env::args;
use std::fs::read_dir;
use std::path::Path;
use std::process::{Command, exit};

const FILES_TO_IGNORE: &[&str] = &["main.css"];

fn get_folders<P: AsRef<Path>>(folder_path: P) -> Vec<String> {
    let mut ret = Vec::with_capacity(10);

    for entry in read_dir(folder_path.as_ref()).expect("read_dir failed") {
        let entry = entry.expect("Couldn't unwrap entry");
        let path = entry.path();

        if !path.is_file() {
            continue
        }
        let filename = path.file_name().expect("file_name failed");
        if FILES_TO_IGNORE.iter().any(|x| x == &filename) {
            continue
        }
        ret.push(format!("{}", path.display()));
    }
    ret
}

fn main() {
    let argv: Vec<String> = args().collect();

    if argv.len() < 3 {
        eprintln!("Needs rustdoc binary path");
        exit(1);
    }
    let rustdoc_bin = &argv[1];
    let themes_folder = &argv[2];
    let themes = get_folders(&themes_folder);
    if themes.is_empty() {
        eprintln!("No theme found in \"{}\"...", themes_folder);
        exit(1);
    }
    let status = Command::new(rustdoc_bin)
                        .args(&["-Z", "unstable-options", "--theme-checker"])
                        .args(&themes)
                        .status()
                        .expect("failed to execute child");
    if !status.success() {
        exit(1);
    }
}