Hello,

could someone please be so kind as to help me with the script?
The script will do the same as the Duplicate command, with the difference that only 2 objects will be selected: a square/rectangle and a text (number).
The script would make a duplicate of the object with all properties preserved, but would increase the value of that number by one.
I tried to write with the help of ChatGPT, but it didn't work.
Thank you J.

Something like this ? 

( I have attached a zip file you can extract in your extensions folder )

import inkex

def increment_text(self, text_element):

    # SVG text elements can be simple <text> Hello </text>
    # Or contain child <tspan> Hello Again </span> elements
    # Or can be a mixture of both.
    # Lets get all child tspans as a list, and add the parent
    # text element to that list.

    element_list = text_element.xpath('*')
    element_list.insert(0, text_element)

    # Now lets loop through that list and test if the
    # text can be converted to a whole number (Integer)

    for element in element_list:
        if element.text:
            try:
                # If test is positive, convert to int and increment by 1
                new_int = int(element.text) + 1
                # convert the new value back to string and update the text
                element.text = str(new_int)
            except:
                continue

class DuplicateIncrement(inkex.EffectExtension):

    def add_arguments(self, pars):
        pass
    
    def effect(self):
        
        # If nothing is selected exit.
        selection_list = self.svg.selected
        if len(selection_list) < 1:
            inkex.errormsg('Please select at least one object')
            return

        # Filter the selection to only include text elements and rectangle elements
        filtered_selection_list = selection_list.filter(inkex.TextElement, inkex.Rectangle)

        for selection in filtered_selection_list:
            # inkex.errormsg(f'{selection} id: {selection.get_id()}')

            selection_dupe = selection.duplicate()
            if selection_dupe.TAG == 'text':
                increment_text(self, selection_dupe)
        
if __name__ == '__main__':
    DuplicateIncrement().run()

Thank you inklinea for your help, it looks nice.

May I be bold and ask for 2 modifications:
1/ select all created duplicates (so that I can manipulate them immediately)
2/ it would be a problem to add a number if there was not the number itself, but a composite text (always with a single number), e.g. "a - 1" -> "a - 2", ... or "1." -> "2." or "1. day" -> "2. day"

... sorry, I still want to ask, will it be possible to create a keyboard shortcut for the script?

.

In order to select all duplicates you would have to mark them in some way that can be found later. 

There are a few ways this can be done. 

Probably the easiest and most transparent is to add an svg data-* attribute. This is transparent to other programs unless they are looking for it.

So my_element.set('data-duplicate', 'true') then in the Edit>Find/Replace panel, you can tick search properties and then attribute name data-duplicate and it will find and select.

If you want to add composite text labels, that is more of a python code problem. All you are really doing in Inkscape is retrieving the text then setting it again after python manipulation.

If you want to mix styles though, like colours / italtics etc - that is very different as it will split the numbers over multiple tspans (svg uses tspans to break up formatting)

If you want to add a shortcut key. All extensions appear in the Inkscape action list on the command line and also in the keyboard shortcut settings under Edit>Preferences>Interface>Keyboard.

You can search for them there. I have attached a screenshot. 

I was not clear about point 1/
... the Duplicate command duplicates the selected objects (e.g. rectangle1 and text1) and the newly created rectangle2 and text2 are selected after executing the command and I can manipulate them immediately.

I would like the same after executing the script. I don't want to manipulate all the duplicated objects, but only the last pair just created.

Regarding point 2/... if I thought a little more, it would have occurred to me that my request could be solved with Find/Replace ;-)

Thank you.

Selection passback from an extension is not supported by the extension system itself.

There are ways to do it, however it is difficult. I wrote a (dbus) extension to do it for Inkscape 1.2, however it is broken in 1.3 :(