Syntax highlighting of code blocks

[ulysses4ever]

I finally added a button for adding code fences through custom css. But now I have a problem with language that highlighter choose.

We use Pascal listings a lot on our forum. A see, highlight.js is aware about Delphi, not Pascal. Great. But for my Pascal/Delphi code

```
begin
  Writeln(add(4,5));     {user function add}
  Writeln(add1(4,5));  {user function add1}
end.
```

it chooses SQL (as it can be seen in class attribute of code elemet); also add and add1 have defferent presentation (probably have meaning for SQL, but complete nonsence for Pascal).

Adding delphi to the fences:

```delphi
begin....

does not help: it adds lang-delphi to class attribute, but sql stays there and presentation does not change at all.

Can anyone suggest how to enable Pascal/Delphi highlightning on Discourse?

[codinghorror]

I believe @sam is working on this. We only include a subset of popular languages for syntax out of the box to keep bloat down.

[john_mardlin]

Is there a list anywhere of the different languages available for highlighting and the keywords to use them?

Can new ones be added?

[cpradio]

It is in the SiteSettings, highlighted languages

[john_mardlin]

Thank you, but I looked there and couldn’t find it.

What am I doing wrong?

[cpradio]

Search for highlighted languages

[kuyashi]

I have been unable to coloured highlighting enabled on my site:

Example when I use:

def hello
   puts "world"
end

this (obviously) colour-highlights perfectly on here, but on my site remains grey:

Settings appear correct ?

Any ideas ?

[sam]

perhaps try reverting related settings to default, does it work then ?

[kuyashi]

I defaulted all the relevant settings - no change.

Also, I could be wrong but I thought maybe it could be some conflict of customs CSS I had on the site, but I returned all CSS to default also, but still no change.

[sam]

Any errors in your JavaScript console? Are you on latest? What plugins are you running?

[kuyashi]

No, none.
Maybe a plugin perhaps ? I’ll step through those and see.

[kuyashi]

So I isolated the conflict down to a plugin:

scossar/discourse-sticky-footer/blob/master/plugin.rb

I now have syntax highlighting working as expected.

@sam - would you have any pointers on how I might establish what the causing factor may be ?

[cpradio]

Quick glance, it is because it isn’t using the Plugin API to initialize itself and thus likely throwing an error that is stopping the highlight.js from executing, but that is purely a guess.

[codinghorror]

Maybe we should let @Simon_Cossar know?

[Simon_Cossar]

I’ll add that it’s broken to the readme.

[Tsirist]

Does Discourse require a rebuild when changing the list of highlighted languages? While highlight.js is working at the moment (languages like Java are being highlighted), I am having trouble adding Coq. Coq is supported by highlight.js and is successfully hightlighted on other sites. Any recommendations? Not urgent, in any case.

[Bas]

def hello
   puts "world"
end

This doesn’t highlight anything for me (was a direct copy from @kuyashi)

[Mittineague]

was a direct copy

Not exactly. There are differences between “raw”, “cooked”, and displayed content.

```ruby
  def hello
    puts "world"
  end
```

  def hello
    puts "world"
  end

[Bas]

  def hello
    puts "world"
  end

Right, got it

<thanks>

[elijah]

To see the raw content of a post (for figuring out what methods people use to get the output), use “Reply” and then push the for “Quote whole post”. After examining it, you can cancel.