Insert Tag - surroung selection with HTML tag

[vptn]

Similar to "Insert HTML/XML tag" in Notepad2-mod.
1. Asks user for tag with attributes.
2. Surrounds current selection with tag provided by user.
3. Works without selection.
4. Knows tags without closing pair.

def openingTag(tagStr):
    return "<" + tagStr + ">"
def closingTag(tagStr):
    pureTag = tagStr.partition(" ")[0]
    unclosedTags = ["br", "input", "img", "link", "hr", "area",
                    "frame", "wbr", "meta", "base", "col",
                    "isindex", "param", "basefont"]
    if pureTag in unclosedTags:
        return ""
    return "</" + pureTag + ">"
tagStr = notepad.prompt("Tag with attributes:", "Insert HTML/XML tag")
if not tagStr is None:
    editor.beginUndoAction()
    
    selStr = editor.getSelText()
    editor.replaceSel(openingTag(tagStr) + selStr + closingTag(tagStr))
    
    editor.endUndoAction()