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use percent_encoding::percent_decode;

/// Content type for a file based on its extension.
pub fn get_content_type(path: &str) -> &'static str {
    match path.split('.').last().unwrap_or("?") {
        "gif" => "image/gif",
        "jpg" => "image/jpeg",
        "jpeg" => "image/jpeg",
        "png" => "image/png",
        "pdf" => "application/pdf",
        "css" => "text/css; charset=utf8",
        "htm" => "text/html; charset=utf8",
        "html" => "text/html; charset=utf8",
        "txt" => "text/plain; charset=utf8",
        _ => "text/plain; charset=utf8",
    }
}

/// Does what it says.
pub fn decode_form_value(post: &str) -> String {
    percent_decode(post.as_bytes())
        .decode_utf8_lossy()
        .replace('+', " ")
        .replace('\r', "")
}

/// Run a script and return its output.
pub fn shell(path: &str, args: &[&str]) -> Result<String, std::io::Error> {
    let output = std::process::Command::new(path).args(args).output()?;
    let out = if output.status.success() {
        output.stdout
    } else {
        output.stderr
    };
    match std::str::from_utf8(&out) {
        Ok(s) => Ok(s.to_string()),
        Err(e) => Err(std::io::Error::new(
            std::io::ErrorKind::Other,
            e.to_string(),
        )),
    }
}