Since there seems to be no native implementation of that in Komodo I just took some JavaScript skills and the time to look into the macro stuff, and found out that it is actually pretty easy. After looking at the macro API doc to find out how to differentiate if something is selected or not. It was as simple as recording the two macros and mixing them together, surrounded by an “if” that does the job right for the selection and the other for the current line. And I was done.

This is the end result. Just create a new macro and put the source there (the video shows how to do that in detail).

// Duplicate line/selection macro, more info at
// http://blog.uxebu.com/2008/06/26/duplicate-lineselection-macro-for-komodo/
komodo.assertMacroVersion(2);
if (komodo.view) { komodo.view.setFocus() };
if (ko.views.manager.currentView.scimoz.selText){
    // Copy the current selection
    komodo.doCommand('cmd_copy')
    komodo.doCommand('cmd_lineNext')
    komodo.doCommand('cmd_linePrevious')
    komodo.doCommand('cmd_paste')
} else {
    // Copy the current line
    komodo.doCommand('cmd_homeAbsolute')
    komodo.doCommand('cmd_selectLineNext')
    komodo.doCommand('cmd_copy')
    komodo.doCommand('cmd_paste')
    komodo.doCommand('cmd_paste')
    komodo.doCommand('cmd_linePrevious')
}

Have fun duplicating …