<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_evcqcjb29fn1uqdd7bues74taj, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
concept G22LeftArrowScript > ConceptWithChangeListeners {
  settableWithVar S description;
  
  // the script (last "saved" version)
  settableWithVar S text;
  
  // the latest code that has been cleared to auto-run (if any)
  settableWithVar ClearForAutoRun<S> clearedForAutoRun;

  // text currently being modified in an editor (or null)
  // Note that "" doesn't count as null.
  settableWithVar S editingText;
  
  @Override void _doneLoading2() {
    //print("_doneLoading " + this);
    cMigrateField(this, "code", "text");
  }
  
  S myType() { ret dropPrefix("G22", shortClassName(this)); }
  
  toString { ret or2(description, myType() + " " + id); }
  
  void initEditingText {
    editingText(unnull(or(editingText, text))); 
  }
  
  S stableText() { ret text; }
  
  void completeEdit aka save() {
    S t = editingText;
    if (t != null) {
      text(t);
      editingText(null);
    }
  }
  
  S textForEditing() {
    initEditingText();
    ret editingText;
  }
  
  File historyFile() {
    ret fileInConceptsDir("History/" + shortDynName(this) + id + ".history");
  }
  
  void saveTextToHistory() {
    File historyFile = assertNotNull(+historyFile());
    S text = this.text;
    appendToTextFile(historyFile,
      "\n===\n" +
      "Concept ID: " + id + "\n" +
      "Date: " + dateWithMSUTC() + "\n" +
      "Text (" + nLines(text) + ", " + nChars(text) + "):\n" +
      indentx(text) + "\n" +
      "\n" +
      "===" + "\n");
  }
}