//! Generating `README` files for the packaged wasm.

use failure;
use std::fs;
use std::path::Path;

use emoji;
use progressbar::Step;
use PBAR;

/// Copy the crate's README into the `pkg` directory.
pub fn copy_from_crate(path: &Path, out_dir: &Path, step: &Step) -> Result<(), failure::Error> {
    assert!(
        fs::metadata(path).ok().map_or(false, |m| m.is_dir()),
        "crate directory should exist"
    );
    assert!(
        fs::metadata(&out_dir).ok().map_or(false, |m| m.is_dir()),
        "crate's pkg directory should exist"
    );

    let msg = format!("{}Copying over your README...", emoji::DANCERS);
    PBAR.step(step, &msg);
    let crate_readme_path = path.join("README.md");
    let new_readme_path = out_dir.join("README.md");
    if fs::copy(&crate_readme_path, &new_readme_path).is_err() {
        PBAR.warn("origin crate has no README");
    }
    Ok(())
}