peisar 0.3.0

A practical Markdown parser written in Rust
Documentation 
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use std::env;
use std::fs;
use std::io;
use std::path::{Path, PathBuf};

/// https://github.com/sindresorhus/markdown-extensions
pub const MARKDOWN_EXTENSIONS: &'static [&str] = &[
    "md", "markdown", "mdown", "mkdn", "mkd", "mdwn", "mkdown", "ron",
];

/// Common asset extensions (images, scripts, styles, fonts)
pub const ASSET_EXTENSIONS: &'static [&str] = &[
    // images
    "png", "jpg", "jpeg", "gif", "svg", "webp", "avif", "ico", "bmp", "tiff",
    // scripts & styles
    "js", "css", "map", // fonts
    "woff", "woff2", "ttf", "eot", // audio/video
    "mp3", "wav", "ogg", "mp4", "webm",
];

/// Subset of asset extensions considered binary (should not be read as UTF-8)
pub const ASSET_BINARY_EXTENSIONS: &'static [&str] = &[
    "png", "jpg", "jpeg", "gif", "webp", "avif", "ico", "bmp", "tiff", "woff", "woff2", "ttf",
    "eot", "mp3", "wav", "ogg", "mp4", "webm",
];

pub fn collect_markdown_files<P: AsRef<Path>>(entry_dir: P) -> io::Result<Vec<PathBuf>> {
    let current_dir = env::current_dir().unwrap_or(PathBuf::from("."));
    let dir_path = current_dir.join(entry_dir.as_ref());
    let mut markdown_files: Vec<PathBuf> = Vec::new();

    if dir_path.is_dir() {
        for entry in fs::read_dir(&dir_path)? {
            let entry = entry?;
            let path = entry.path();

            if path.is_dir() {
                // Recurse into subdirectory; PathBuf implements AsRef<Path>
                let nested = collect_markdown_files(path)?;
                markdown_files.extend(nested);
            } else if path.is_file() {
                if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
                    if MARKDOWN_EXTENSIONS.contains(&ext) {
                        markdown_files.push(path);
                    }
                }
            }
        }
    }

    Ok(markdown_files)
}

pub fn collect_asset_files<P: AsRef<Path>>(entry_dir: P) -> io::Result<Vec<PathBuf>> {
    let current_dir = env::current_dir().unwrap_or(PathBuf::from("."));
    let dir_path = current_dir.join(entry_dir.as_ref());
    let mut asset_files: Vec<PathBuf> = Vec::new();

    if dir_path.is_dir() {
        for entry in fs::read_dir(&dir_path)? {
            let entry = entry?;
            let path = entry.path();

            if path.is_dir() {
                // Recurse
                let nested = collect_asset_files(path)?;
                asset_files.extend(nested);
            } else if path.is_file() {
                if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
                    if ASSET_EXTENSIONS.contains(&ext) {
                        asset_files.push(path);
                    }
                }
            }
        }
    }

    Ok(asset_files)
}