Asciidoctor-pdf: Source code blocks are rendered without indentation in versions 1.5.0.beta.3 and 1.5.0.beta.4

[BojanStipic]

Source code blocks, such as this one:

[source,c]
----
int main() {
    lsp_event_loop();
    return 0;
}

void lsp_event_loop(void) {
    for(;;) {
        unsigned long content_length = lsp_parse_header(); //<1>
        cJSON *request = lsp_parse_content(content_length); //<2>
        json_rpc(request); //<3>
        cJSON_Delete(request); //<4>
    }
}
----

are rendered without indentation.

This is the rendered output:

It worked fine with 1.5.0.beta.2 and earlier versions, but is broken in 1.5.0.beta.3 and 1.5.0.beta.4.

My document is available in this repository, so you can take a look at it as an example. It can be compiled with make command.

[mojavelinux]

It looks like the tab processing broke. Sigh. It has been a game of whack-a-mole to get this logic stabilized. I'll take a look. It just means we need more tests.

[mojavelinux]

Can you tell me which version of Asciidoctor core you're using?

asciidoctor -v

(That matters since Asciidoctor PDF uses Asciidoctor).

[BojanStipic]

Thank you for the quick response.
Sure, version is:

Asciidoctor 2.0.10 [https://asciidoctor.org]
Runtime Environment (ruby 2.6.4p104 (2019-08-28 revision 67798) [x86_64-linux]) (lc:UTF-8 fs:UTF-8 in:UTF-8 ex:UTF-8)

I think it is a problem with asciidoctor-pdf specifically, because I downgraded to 1.5.0.beta.2 without touching Asciidoctor core and it started indenting again.

[mojavelinux]

As a workaround, you can set the tabsize attribute on the document, which activates the same logic as before.

= Document Title
:tabsize: 4

content here

(You could also set it from the API or CLI).

[mojavelinux]

Yes, I know the problem is with Asciidoctor PDF. I had made the assumption that core always replaces tabs, but that's not always true. And tabs must always be replaced in the PDF since PDF doesn't support tabs.