// This file is part of Germ <https://github.com/gemrest/germ>.
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
// SPDX-License-Identifier: GPL-3.0-only

//! This example demonstrates a chain of Germ's capabilities by fetching a
//! Gemini capsule, parsing the response content into an abstract syntax tree,
//! and converting the abstract syntax tree back to Gemtext, identical to the
//! Gemini response content.

fn main() {
  // Form a valid URL to a Gemini capsule
  let url = url::Url::parse("gemini://fuwn.me/").unwrap();
  // Perform a blocking request to the Gemini capsule
  let request = germ::request::blocking::request(&url);

  match request {
    // If the request was successful:
    Ok(response) => {
      // Obtain the content of the Gemini response
      let response_content =
        &*response.content().clone().unwrap_or_else(|| "".to_string());
      // Parse the Gemini response content into an abstract syntax tree
      let ast = germ::ast::Ast::from_string(response_content);
      // Convert the abstract syntax tree back to Gemtext, identical to the
      // Gemini response content, constructed from the parsed abstract syntax
      // tree
      let gemtext = ast.to_gemtext();

      // Print the Gemtext
      println!("{}", gemtext)
    }
    // If the request was unsuccessful, do nothing
    Err(_) => {}
  }
}