Function print

lib/internal/repl/utils.js:623–680

(outputLine, inputLine, cursor = repl.cursor)

  }

  function print(outputLine, inputLine, cursor = repl.cursor) {
    // TODO(BridgeAR): Resizing the terminal window hides the overlay. To fix
    // that, readline must be aware of this information. It's probably best to
    // add a couple of properties to readline that allow to do the following:
    // 1. Add arbitrary data to the end of the current line while not counting
    //    towards the line. This would be useful for the completion previews.
    // 2. Add arbitrary extra lines that do not count towards the regular line.
    //    This would be useful for both, the input preview and the reverse
    //    search. It might be combined with the first part?
    // 3. Add arbitrary input that is "on top" of the current line. That is
    //    useful for the reverse search.
    // 4. To trigger the line refresh, functions should be used to pass through
    //    the information. Alternatively, getters and setters could be used.
    //    That might even be more elegant.
    // The data would then be accounted for when calling `_refreshLine()`.
    // This function would then look similar to:
    //   repl.overlay(outputLine);
    //   repl.addTrailingLine(inputLine);
    //   repl.setCursor(cursor);
    // More potential improvements: use something similar to stream.cork().
    // Multiple cursor moves on the same tick could be prevented in case all
    // writes from the same tick are combined and the cursor is moved at the
    // tick end instead of after each operation.
    let rows = 0;
    if (lastMatch !== -1) {
      const line = StringPrototypeSlice(repl.history[lastMatch], 0, lastCursor);
      rows = repl._getDisplayPos(`${repl.getPrompt()}${line}`).rows;
      cursorTo(repl.output, promptPos.cols);
    } else if (isInReverseSearch && repl.line !== '') {
      rows = repl.getCursorPos().rows;
      cursorTo(repl.output, promptPos.cols);
    }
    if (rows !== 0)
      moveCursor(repl.output, 0, -rows);

    if (isInReverseSearch) {
      clearScreenDown(repl.output);
      repl.output.write(`${outputLine}\n${inputLine}`);
    } else {
      repl.output.write(`\n${inputLine}`);
    }

    lastMatch = -1;

    // To know exactly how many rows we have to move the cursor back we need the
    // cursor rows, the output rows and the input rows.
    const prompt = repl.getPrompt();
    const cursorLine = prompt + StringPrototypeSlice(outputLine, 0, cursor);
    const cursorPos = repl._getDisplayPos(cursorLine);
    const outputPos = repl._getDisplayPos(`${prompt}${outputLine}`);
    const inputPos = repl._getDisplayPos(inputLine);
    const inputRows = inputPos.rows - (inputPos.cols === 0 ? 1 : 0);

    rows = -1 - inputRows - (outputPos.rows - cursorPos.rows);

    moveCursor(repl.output, 0, rows);
    cursorTo(repl.output, cursorPos.cols);
  }