Is there a way to calculate secondary_prompt length?

[snuyanzin]

Especially interested in case of usage of colorized dynamic prompt, i.e. do not want to take into account color symbols

[gnodet]

Could you give a bit more details ? I'm not sure where your code would be or what the input would be. The secondary prompts are computed as a List<AttributedString> and the AttributedString has a length() method which returns the number of characters. You also have columnLength() which returns the number of columns taking into account wide characters.

[snuyanzin]

Sorry for delay.
The initial idea was to use this length for padding calculation for secondary prompt especially for cases when secondary prompt contains colorized symbols or line numbers.
But then I found %P for that and currently I use

.setVariable(LineReader.SECONDARY_PROMPT_PATTERN, "%N%P %M> ");

and the result is

The issue with this approach that I could not find a way how I can do padding not just with one char but with several e.g. . rather than just space. So I want to see something like this

sqlline> !set prompt '%[foreground:yellow,bold,italic%]my_sql_prompt> '
my_sql_prompt> select
2. .semicolon> 1
3. .semicolon> from
4. .semicolon> dual;

[gnodet]

There's no easy way to do that without changing the code right now. I think this would require a new pattern which would use a string rather than a single char.
Another way would be to have a way to plug in some processing but the two insertSecondaryPrompts are currently private.