hyper/app/lib/hterm.js

import { hterm, lib } from 'hterm-umdjs';

hterm.defaultStorage = new lib.Storage.Memory();

// override double click behavior to copy
const oldMouse = hterm.Terminal.prototype.onMouse_;
hterm.Terminal.prototype.onMouse_ = function (e) {
  if ('dblclick' === e.type) {
    console.log('[hyperterm+hterm] ignore double click');
    return;
  }
  return oldMouse.call(this, e);
};

// there's no option to turn off the size overlay
hterm.Terminal.prototype.overlaySize = function () {};

// fixing a bug in hterm where a double click triggers
// a non-collapsed selection whose text is '', and results
// in an infinite copy loop
hterm.Terminal.prototype.copySelectionToClipboard = function () {
  var text = this.getSelectionText();
  if (text != null && text !== '') {
    this.copyStringToClipboard(text);
  }
};

// passthrough all the commands that are meant to control
// hyperterm and not the terminal itself
const oldKeyDown = hterm.Keyboard.prototype.onKeyDown_;
hterm.Keyboard.prototype.onKeyDown_ = function (e) {
  if (e.metaKey) {
    return;
  }
  return oldKeyDown.call(this, e);
};

const oldKeyPress = hterm.Keyboard.prototype.onKeyPress_;
hterm.Keyboard.prototype.onKeyPress_ = function (e) {
  if (e.metaKey) {
    return;
  }
  return oldKeyPress.call(this, e);
};

// we re-implement `wipeContents` to preserve the line
// and cursor position that the client is in.
// otherwise the user ends up with a completely clear
// screen which is really strange
hterm.Terminal.prototype.clearPreserveCursorRow = function () {
  this.scrollbackRows_.length = 0;
  this.scrollPort_.resetCache();

  [this.primaryScreen_, this.alternateScreen_].forEach((screen) => {
    const bottom = screen.getHeight();
    if (bottom > 0) {
      this.renumberRows_(0, bottom);

      const x = screen.cursorPosition.column;
      const y = screen.cursorPosition.row;

      if (x === 0) {
        // Empty screen, nothing to do.
        return;
      }

      // here we move the row that the user was focused on
      // to the top of the screen
      this.moveRows_(y, 1, 0);

      for (let i = 1; i < bottom; i++) {
        screen.setCursorPosition(i, 0);
        screen.clearCursorRow();
      }

      // we restore the cursor position
      screen.setCursorPosition(0, x);
    }
  });

  this.syncCursorPosition_();
  this.scrollPort_.invalidate();

  // this will avoid a bug where the `wipeContents`
  // hterm API doens't send the scroll to the top
  this.scrollPort_.redraw_();
};

export default hterm;
export { lib };