cpp-ncurses-wrapper/src/cli.cxx

//
//  cli.cpp
//  ncurses-wrapper
//
//  Created by Sam Jaffe on 7/23/24.
//

#include "ncurses-wrapper/cli.h"

#include "ncurses-wrapper/window.h"

namespace curses {
void Cli::loop(std::function<void(curses::Window &, std::string)> on_enter) {
  window_.printf("%s", prompt_.c_str());
  while (true) {
    int ch;
    switch (ch = window_.getch()) {
    case KEY_UP:
      if (vertical_offset_ + 1 < stack_.size()) {
        ++vertical_offset_;
        horizontal_offset_ = 0;
        window_.clear_line();
        window_.printf("%s%s", prompt_.c_str(), get().c_str());
      }
      break;
    case KEY_DOWN:
      if (vertical_offset_ > 0) {
        --vertical_offset_;
        horizontal_offset_ = 0;
        window_.clear_line();
        window_.printf("%s%s", prompt_.c_str(), get().c_str());
      }
      break;
    case KEY_LEFT:
      if (horizontal_offset_ + 1 < get().size()) {
        ++horizontal_offset_;
        window_.move(Offset{-1, 0});
      }
      break;
    case KEY_RIGHT:
      if (horizontal_offset_ > 0) {
        --horizontal_offset_;
        window_.move(Offset{1, 0});
      }
      break;
    case KEY_BACKSPACE:
    case KEY_DC:
    case 127:
      if (horizontal_offset_ < get().size()) {
        get().erase(get().end() - horizontal_offset_ - 1);
        window_.move(Offset{-1, 0});
        window_.delch();
      }
      break;
    case 10:
    case KEY_ENTER:
      window_.printf("\n");
      if (!get().empty()) {
        on_enter(window_, get());
        stack_.emplace_back();
      }
      window_.printf("%s", prompt_.c_str());
      break;
    default:
      get().insert(get().size() - horizontal_offset_, 1, ch);
      window_.printf("%c", ch);
      if (horizontal_offset_ > 0) {
        window_.printf("%s", get().c_str() + get().size() - horizontal_offset_);
        window_.move(Offset{-horizontal_offset_, 0});
      }
      break;
    }
  }
}

}