Ejemplo n.º 1
0
  /** Clear the screen by issuing the ANSI "clear screen" code. */
  public boolean clearScreen() throws IOException {
    if (!terminal.isANSISupported()) {
      return false;
    }

    // send the ANSI code to clear the screen
    printString(((char) 27) + "[2J");
    flushConsole();

    // then send the ANSI code to go to position 1,1
    printString(((char) 27) + "[1;1H");
    flushConsole();

    redrawLine();

    return true;
  }
Ejemplo n.º 2
0
  /** Issue an audible keyboard bell, if {@link #getBellEnabled} return true. */
  public final void beep() throws IOException {
    if (!(getBellEnabled())) {
      return;
    }

    printCharacter(KEYBOARD_BELL);
    // need to flush so the console actually beeps
    flushConsole();
  }
Ejemplo n.º 3
0
  /** Clear ahead the specified number of characters without moving the cursor. */
  private final void clearAhead(final int num) throws IOException {
    if (num == 0) {
      return;
    }

    // debug ("clearAhead: " + num);

    // print blank extra characters
    printCharacters(' ', num);

    // we need to flush here so a "clever" console
    // doesn't just ignore the redundancy of a space followed by
    // a backspace.
    flushConsole();

    // reset the visual cursor
    back(num);

    flushConsole();
  }
Ejemplo n.º 4
0
  /**
   * Redraw the rest of the buffer from the cursor onwards. This is necessary for inserting text
   * into the buffer.
   *
   * @param clear the number of characters to clear after the end of the buffer
   */
  private final void drawBuffer(final int clear) throws IOException {
    // debug ("drawBuffer: " + clear);
    char[] chars = buf.buffer.substring(buf.cursor).toCharArray();
    if (mask != null) Arrays.fill(chars, mask.charValue());

    printCharacters(chars);

    clearAhead(clear);
    back(chars.length);
    flushConsole();
  }
Ejemplo n.º 5
0
  /**
   * Output the specified {@link Collection} in proper columns.
   *
   * @param stuff the stuff to print
   */
  public void printColumns(final Collection stuff) throws IOException {
    if ((stuff == null) || (stuff.size() == 0)) {
      return;
    }

    int width = getTermwidth();
    int maxwidth = 0;

    for (Iterator i = stuff.iterator();
        i.hasNext();
        maxwidth = Math.max(maxwidth, i.next().toString().length())) {;
    }

    StringBuffer line = new StringBuffer();

    int showLines;

    if (usePagination) showLines = getTermheight() - 1; // page limit
    else showLines = Integer.MAX_VALUE;

    for (Iterator i = stuff.iterator(); i.hasNext(); ) {
      String cur = (String) i.next();

      if ((line.length() + maxwidth) > width) {
        printString(line.toString().trim());
        printNewline();
        line.setLength(0);
        if (--showLines == 0) { // Overflow
          printString(loc.getString("display-more"));
          flushConsole();
          int c = readVirtualKey();
          if (c == '\r' || c == '\n') showLines = 1; // one step forward
          else if (c != 'q') showLines = getTermheight() - 1; // page forward

          back(loc.getString("display-more").length());
          if (c == 'q') break; // cancel
        }
      }

      pad(cur, maxwidth + 3, line);
    }

    if (line.length() > 0) {
      printString(line.toString().trim());
      printNewline();
      line.setLength(0);
    }
  }
Ejemplo n.º 6
0
 /** Output a platform-dependant newline. */
 public final void printNewline() throws IOException {
   printString(CR);
   flushConsole();
 }
Ejemplo n.º 7
0
 /** Clear the line and redraw it. */
 public final void redrawLine() throws IOException {
   printCharacter(RESET_LINE);
   flushConsole();
   drawLine();
 }
Ejemplo n.º 8
0
  /**
   * Read a line from the <i>in</i> {@link InputStream}, and return the line (without any trailing
   * newlines).
   *
   * @param prompt the prompt to issue to the console, may be null.
   * @return a line that is read from the terminal, or null if there was null input (e.g.,
   *     <i>CTRL-D</i> was pressed).
   */
  public String readLine(final String prompt, final Character mask) throws IOException {
    this.mask = mask;
    if (prompt != null) this.prompt = prompt;

    try {
      terminal.beforeReadLine(this, this.prompt, mask);

      if ((this.prompt != null) && (this.prompt.length() > 0)) {
        out.write(this.prompt);
        out.flush();
      }

      // if the terminal is unsupported, just use plain-java reading
      if (!terminal.isSupported()) {
        return readLine(in);
      }

      while (true) {
        int[] next = readBinding();

        if (next == null) {
          return null;
        }

        int c = next[0];
        int code = next[1];

        if (c == -1) {
          return null;
        }

        boolean success = true;

        switch (code) {
          case EXIT: // ctrl-d
            if (buf.buffer.length() == 0) {
              return null;
            }

          case COMPLETE: // tab
            success = complete();
            break;

          case MOVE_TO_BEG:
            success = setCursorPosition(0);
            break;

          case KILL_LINE: // CTRL-K
            success = killLine();
            break;

          case CLEAR_SCREEN: // CTRL-L
            success = clearScreen();
            break;

          case KILL_LINE_PREV: // CTRL-U
            success = resetLine();
            break;

          case NEWLINE: // enter
            moveToEnd();
            printNewline(); // output newline
            return finishBuffer();

          case DELETE_PREV_CHAR: // backspace
            success = backspace();
            break;

          case DELETE_NEXT_CHAR: // delete
            success = deleteCurrentCharacter();
            break;

          case MOVE_TO_END:
            success = moveToEnd();
            break;

          case PREV_CHAR:
            success = moveCursor(-1) != 0;
            break;

          case NEXT_CHAR:
            success = moveCursor(1) != 0;
            break;

          case NEXT_HISTORY:
            success = moveHistory(true);
            break;

          case PREV_HISTORY:
            success = moveHistory(false);
            break;

          case REDISPLAY:
            break;

          case PASTE:
            success = paste();
            break;

          case DELETE_PREV_WORD:
            success = deletePreviousWord();
            break;

          case PREV_WORD:
            success = previousWord();
            break;

          case NEXT_WORD:
            success = nextWord();
            break;

          case START_OF_HISTORY:
            success = history.moveToFirstEntry();
            if (success) setBuffer(history.current());
            break;

          case END_OF_HISTORY:
            success = history.moveToLastEntry();
            if (success) setBuffer(history.current());
            break;

          case CLEAR_LINE:
            moveInternal(-(buf.buffer.length()));
            killLine();
            break;

          case INSERT:
            buf.setOvertyping(!buf.isOvertyping());
            break;

          case UNKNOWN:
          default:
            if (c != 0) { // ignore null chars
              ActionListener action =
                  (ActionListener) triggeredActions.get(new Character((char) c));
              if (action != null) action.actionPerformed(null);
              else putChar(c, true);
            } else success = false;
        }

        if (!(success)) {
          beep();
        }

        flushConsole();
      }
    } finally {
      terminal.afterReadLine(this, this.prompt, mask);
    }
  }
Ejemplo n.º 9
0
 /** Move the visual cursor backwards without modifying the buffer cursor. */
 private final void back(final int num) throws IOException {
   printCharacters(BACKSPACE, num);
   flushConsole();
 }