/**
* Reads a single line from the user.
*
* @param string $prompt You may specify a string with which to prompt the user.
*
* @return Returns a single string from the user.
*/
public function readline($prompt = null)
{
$line = null;
$this->_reset();
// Output prompt
if ($prompt !== null) {
$this->_prompt = $prompt;
echo $prompt;
}
while (1) {
$c = self::readKey();
switch ($c) {
// Unrecognised character
case null:
Terminal::bell();
break;
// TAB
// TAB
case chr(9):
// If autocompletion is registered, then do it
if ($this->_autocomplete_callback !== null) {
$autocomplete_text = $this->_doAutocomplete($this->_buffer);
if (!empty($autocomplete_text)) {
$this->_insert($autocomplete_text);
} else {
Terminal::bell();
}
// Otherwise, TAB will insert spaces
} else {
$this->_insert(" ");
}
break;
// CTRL-A (Home) - move the cursor all the way to the left
// CTRL-A (Home) - move the cursor all the way to the left
case chr(1):
$this->_cursorLeft($this->_buffer_position);
break;
// CTRL-E (End) - move cursor all the way to the end
// CTRL-E (End) - move cursor all the way to the end
case chr(5):
$this->_cursorRight(mb_strlen($this->_buffer) - $this->_buffer_position);
break;
// Line-delete - backspace from current position to beginning of line
// Line-delete - backspace from current position to beginning of line
case chr(21):
$this->_backspace($this->_buffer_position);
break;
// Word-delete (CTRL-W)
// Word-delete (CTRL-W)
case chr(23):
// Get previous word position
$prev_word_pos = $this->_buffer_position - $this->_getPreviousWordPos();
// Delete word, unless we're at the start of the line, then bell
if ($prev_word_pos > 0) {
$this->_backspace($this->_buffer_position - $this->_getPreviousWordPos());
} else {
Terminal::bell();
}
break;
// CTRL-LEFT
// CTRL-LEFT
case chr(27) . chr(91) . chr(53) . chr(68):
$this->_cursorLeft($this->_buffer_position - $this->_getPreviousWordPos());
break;
// CTRL-RIGHT
// CTRL-RIGHT
case chr(27) . chr(91) . chr(53) . chr(67):
$this->_cursorRight($this->_getNextWordPos() - $this->_buffer_position);
break;
// CTRL-C
// CTRL-C
case chr(3):
$line = $this->_buffer . $c;
break;
// CTRL-D
// CTRL-D
case chr(4):
// Return current line immediately on CTRL-D
if (mb_strlen($this->_buffer) === 0) {
$line = $this->_buffer . $c;
} else {
Terminal::bell();
}
break;
case UP:
// Move backwards in the history
if (!$this->_historyMovePosition(-1)) {
Terminal::bell();
}
break;
case DOWN:
// Move forward in the history
if (!$this->_historyMovePosition(1)) {
Terminal::bell();
}
break;
case LEFT:
// Move left, or beep if we're already at the beginning
if (!$this->_cursorLeft()) {
Terminal::bell();
}
break;
case RIGHT:
// Move right, or beep if we're already at the end
if (!$this->_cursorRight()) {
Terminal::bell();
}
break;
// Backspace key
// Backspace key
case chr(8):
// Delete
// Delete
case chr(127):
if (!$this->_backspace()) {
Terminal::bell();
}
break;
// Enter key
// Enter key
case chr(10):
// Set the $line variable so we return below
$line = $this->_buffer;
break;
// Normal character key
// Normal character key
default:
// Ignore unknown control characters
if (ord($c[0]) === 27) {
Terminal::bell();
continue;
}
// Insert this character into the buffer and move on
$this->_insert($c);
}
// If line has been set, we're ready to do something with this command
if ($line !== null) {
// Firstly check for internal commands
if ($this->_runInternalCommand(trim($line))) {
// It it was an internal command, don't return, just reset and pretend
// nothing happened...
$this->addHistory($line);
$line = null;
$this->_reset();
}
// Remove temp history item
array_pop($this->_history_tmp);
return $line;
}
}
}