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/*
* Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
* Copyright (C) 2026 Richard Qin
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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 <https://www.gnu.org/licenses/>.
*/
#include "ricochet/core/browser.hh"
#include "ricochet/net/http_client.hh"
#include "ricochet/parser/html_lexer.hh"
#include "ricochet/parser/tree_builder.hh"
#include "ricochet/render/renderer.hh"
#include "ricochet/tui/terminal.hh"
#include <cstddef>
#include <iostream>
namespace ricochet::core {
namespace {
std::vector<std::string> load_page( std::string_view url )
{
const net::HttpClient client;
auto response_result = client.fetch( url );
if ( !response_result.has_value() ) {
return { "[!] Failed to load: " + std::string( url ) };
}
const parser::HtmlLexer lexer;
const parser::TreeBuilder builder;
const render::Renderer renderer;
const auto dom_root = builder.build( lexer.tokenize( response_result.value().body ) );
const std::string text = renderer.render( dom_root );
std::vector<std::string> lines;
std::size_t start = 0;
while ( start < text.length() ) {
const std::size_t end = text.find( '\n', start );
if ( end == std::string::npos ) {
lines.push_back( text.substr( start ) );
break;
}
lines.push_back( text.substr( start, end - start ) );
start = end + 1;
}
return lines;
}
void draw_view( const tui::Terminal& terminal,
const std::vector<std::string>& lines,
std::size_t scroll_y,
std::string_view url )
{
terminal.clear_screen();
auto [width, height] = terminal.get_size();
const std::size_t usable_height = ( height > 1 ) ? ( height - 1 ) : 1;
for ( std::size_t i = 0; i < usable_height; ++i ) {
if ( scroll_y + i < lines.size() ) {
std::cout << lines[scroll_y + i] << "\r\n";
} else {
std::cout << "~\r\n";
}
}
std::cout << "\033[7m URL: " << url << " | [j/k] Scroll [/] Jump [q] Quit \033[0m";
std::cout.flush();
}
std::string get_url_input( const tui::Terminal& terminal )
{
auto [width, height] = terminal.get_size();
terminal.move_cursor( height, 1 );
std::cout << "\x1b[2K\033[7m URL: \033[0m ";
std::cout.flush();
std::string input;
terminal.show_cursor( true );
while ( true ) {
const char ch = terminal.read_key();
if ( ch == '\r' || ch == '\n' ) {
break;
}
if ( ch == 27 ) {
input.clear();
break;
}
if ( ch == 127 || ch == 8 ) {
if ( !input.empty() ) {
input.pop_back();
std::cout << "\b \b";
std::cout.flush();
}
} else if ( std::isprint( static_cast<unsigned char>( ch ) ) ) {
input += ch;
std::cout << ch;
std::cout.flush();
}
}
terminal.show_cursor( false );
if ( !input.empty() && !input.starts_with( "http://" ) && !input.starts_with( "https://" ) ) {
input.insert( 0, "https://" );
}
return input;
}
} // namespace
int Browser::run( std::string_view initial_url )
{
std::cout << "-> Fetching: " << initial_url << "...\n";
std::string current_url { initial_url };
const tui::Terminal terminal;
terminal.clear_screen();
while ( !current_url.empty() ) {
auto lines = load_page( current_url );
std::size_t scroll_y = 0;
bool navigate = false;
while ( !navigate ) {
draw_view( terminal, lines, scroll_y, current_url );
const char c = terminal.read_key();
auto [width, height] = terminal.get_size();
const std::size_t view_h = ( height > 1 ) ? ( height - 1 ) : 1;
if ( c == 'q' ) {
terminal.clear_screen();
return 0;
}
if ( c == 'j' && scroll_y + view_h < lines.size() ) {
scroll_y++;
} else if ( c == 'k' && scroll_y > 0 ) {
scroll_y--;
} else if ( c == '/' ) {
std::string next_url = get_url_input( terminal );
if ( !next_url.empty() ) {
current_url = std::move( next_url );
navigate = true;
}
}
}
}
terminal.clear_screen();
return 0;
}
} // namespace ricochet::core
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