WP-GeSHi-Highlight

A WordPress plugin by Jan-Philip Gehrcke, featuring:

Syntax highlighting for many languages (based on GeSHi).
Stability, performance and security inherited from GeSHi.
Line numbering (optional). Code-number displacements never occur. Numbers are not copied in most browsers.
Simple usage.
If desired, styles are highly & easily configurable.
Per-block styles: each code block on a single web page can be designed on its own.
High performance.
Clean, small and valid HTML output.
Clean and well-documented source code.

Contact:

jgehrcke@googlemail.com or leave a comment below.

What do you want to do?

Examples

What follows is a snippet of the source code of this plugin. The code block is configured with lang="php" and line="1". The block is styled by the default style file wp-geshi-highlight.css:

function wp_geshi_filter_and_replace_code_snippets() {

```
    global $wp_query;
```

    // Iterate over all posts in this query.

    foreach ($wp_query->posts as $post) {

        // Extract code snippets from the content. Replace them.

        $post->post_content = wp_geshi_filter_replace_code($post->post_content);

```
        if (is_single()) {
```

            $comments_array = get_approved_comments($post->ID);

            // Iterate over all approved comments belonging to this post.

```
            // Filter them, too.
```

            foreach ($comments_array as $comment) {

                $comment->comment_content = wp_geshi_filter_replace_code(

                    $comment->comment_content);

```
                }
```
```
            }
```
```
        }
```
```
    }
```

Let us have a look at a line from a shell script. In this case, the code block is configured with lang="bash". This time, we use a different style, via cssfile="another_style":

$ dd if=/dev/zero of=image.ext3 bs=1M count=10000 oflag=append conv=notrunc

In this example, the WP-GeSHi-Highlight looks for another_style.css on the server and finds it. What follows is the content of another_style.css, using pure GeSHi styling, activated via lang="css" and cssfile="none" options:

.another_style {
  font-size: 12px;
  line-height: 13px;
  background-color: #EFEFF7;
  border-top: 1px solid silver;
  border-bottom: 1px solid silver;
  padding-left: 5px;
  }

I have tested these examples on Linux systems as well as on Windows 7 on Firefox 3.6 to 18, Internet Explorer 8&9, Chrome 6 to 23, and Opera. Please let me know if you encounter any problems, especially with the default CSS style.

General usage

Write your post or page in the raw HTML editor. The general syntax for highlighting your code using this plugin is

<pre arguments>
 
[... CODE ...]
 
</pre>

The required argument is:

lang="languagestring": allowed values are listed here.

Optional arguments are:

line="1": enables line numbering. Select the start number? See FAQ.
cssfile="string": selects a CSS file to style this code block.
Allowed values:
- "none": all block styling is omitted. The code is still highlighted by GeSHi.
- "filename": If the file filename.css exists in the plugin directory or in WordPress’ stylesheet_directory (takes precedence), it is used to style the code block. Hence, if you store another_style.css on your server, you can use it by setting cssfile="another_style".
If you do not set this at all, wp-geshi-highlight.css styles your code block.
escaped="true": the code is run through PHP’s htmlspecialchars_decode().

How to apply your own styles

Permanently change the default style:
By default, wp-geshi-highlight.css from the plugin directory is inserted in the HTML head (via HTML link tag) and defines the default code block style. You can permanently change the default code block style by placing your own wp-geshi-highlight.css in WordPress’ stylesheet_directory (which usually is the theme style directory). If WP-GeSHi-Highlight finds it there, it takes precedence and is inserted into the HTML head instead of the default file. Obviously, such custom styling survives WP-GeSHi-Highlight updates.

Apply different styles to different code blocks:
Provide your own CSS file and use the cssfile option. Consider, for example, cssfile="another_style". This will make two things happen:

WP-GeSHi-Highlight puts the following structure around the HTML code generated by GeSHi:

<div class="another_style-wrap5">
    <div class="another_style-wrap4">
        <div class="another_style-wrap3">
            <div class="another_style-wrap2">
                <div class="another_style-wrap">
                    <div class="another_style">
                        HTML code generated by GeSHi
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

As you can see, the names of the six CSS classes depend on the value given to cssfile.

WP-GeSHi-Highlight looks for another_style.css in WP-GeSHi-Highlight’s plugin directory as well as in WordPress’ stylesheet_directory. If it is found, it is included in the HTML header of your website (whereas the stylesheet directory takes precedence over the plugin directory).

Hence, you have plenty of room to style your code block within another_style.css, using the six different CSS classes.

FAQ

Can I change the starting line number?
Yes, try e.g. line="13". But this breaks XHTML strict compliance.

How can I use the pre and other HTML tags in my code?
Make use of HTML escape sequences and the escaped option. Write the code like that:

&lt;pre lang="html4strict" escaped="true"&gt;
hello!
&lt;/pre&gt;

It will end up like:

<pre lang="html4strict" escaped="true">
hello!
</pre>

Note that the only difference between both code blocks is that in the upper one I did not use escaped="true" in order to demonstrate what you actually have to type.

#content pre, #content kbd, #content tt, #content var { font-size: 15px; line-height: 21px; } style.css (Zeile 484) #content p, #content ul, #content ol, #content dd, #content pre, #content hr { margin-bottom: 24px; }

user_login . "\n"; echo 'User email: ' . $current_user->user_email . "\n"; echo 'User first name: ' . $current_user->user_firstname . "\n"; echo 'User last name: ' . $current_user->user_lastname . "\n"; echo 'User display name: ' . $current_user->display_name . "\n"; echo 'User ID: ' . $current_user->ID . "\n"; ?>

http://nas-tweaks.net Uli

Hello,

when using the Plugin in Version 1.0.2 on WordPress 3.1 with Theme Arras, the comments on the articles are not showing up. With 1.0.1-beta it works without changing anything else.

Best Regards,
Uli
- http://gehrcke.de Jan-Philip Gehrcke
  
  I am very sorry for this big one. Argh. I did my tests, but obviously I performed them much to briefly. Sorry! And thank you very very much for reporting this!
  
  I just uploaded version 1.0.3 which fixes this problem.
  
  Jan-Philip
http://nas-tweaks.net Uli

Thanks, that fixed it!

Thanks for the plugin! I have another thing for you ;) When having the same type of sourcecode on the same page, the CSS for the highlighting is generated over and over again in the sourcecode although it’s completely identical (e.g. .bash is definied 10 times if pre lang=”bash” is used 10 times in the post). Would it be possible to push this only once to the output?

Thanks in advance!

Best Regards,
Uli
- http://gehrcke.de Jan-Philip Gehrcke
  
  Hello again :-)
  
  Yes, I know about this and it makes me feel somehow uncomfortable, too. The reason is that every code block is processed individually, without looking to the left or to the right. Until now I thought about it like this: more intelligence requires more effort — which affects the performance for every single page request containing code to highlight negatively. This should be the case. To be sure, I have to look deeper into GeSHi again. Maybe there is some way without losing performance.
  
  So, yeah… I have some very vague ideas how to implement more intelligence to prohibit duplicate pieces of CSS code. If I have time, I will check it out and see how much performance this actually costs. Then, I’ll make some decision :-)
  
  Thanks for your comment!
  - http://gehrcke.de Jan-Philip Gehrcke
    Uli,
    
    I just modified the plugin in a way, so that CSS code for one specific language is only printed once, but then entirely without further optimization adjusted to your actual piece of code. This way, the CSS code can be used for other code blocks using the same language on the same page, too. Hence, duplicate code output is prevented.
    
    Let me show it to you here :-)
    
    find . -name "rofl" | grep lol
    
    ls -ahl
    
    import os
    
    for foo in bar: print [a.stfu for a in foo if foo in bar]
    - http://wolf-u.li Uli
      
      Hello Jan-Philip,
      
      now it’s perfect :) That reduced the size of some of my pages a lot as i used many code examples :)
      
      Thanks for the great support!
      
      Best Regards,
      Uli
http://byedesigns.com Jesse Bye

Hi Jan-Philip,
I would really like to use your plugin, but for some reason I’m unable to get it running on my WP 3.0.4 installation. I added and activated the plugin, but when I add the lang=”" argument to some code, it doesn’t get formatted. On my example page, you can see that neither the CSS or JS get added to the header. Am I missing something? Is there more that I need to do to get it running besides installing and activating it?

Thank you so much for your hard work and help.
- http://gehrcke.de Jan-Philip Gehrcke
  
  Hey Jesse,
  
  sorry for the late reply. It’s difficult to diagnose the problem remotely. I assume you’re not using the visual editor for your posts and it seems that the HTML you’re writing goes to the output without further filtering. My first guess ist that there might be an incompatibility with another plugin you are using.
  
  Could you take this approach and see if you find an incompatibility by deactivating this or that plugin?
  
  Let’s see where this goes.. :-)
http://byedesigns.com Jesse Bye

Thanks for your reply! I disabled all the other plugins I was using (Akismet, Lightbox Gallery, and WordPress.com stats), but no change, the plugin still doesn’t show up. As you’ve probably noticed, I’m using a very slightly modified version of Twenty Ten. However, I did try another theme and still the same problem. Everything else is pretty much standard, just a vanilla WP installation with no modifications.

If it would help you diagnose things, I could setup an admin account for you so you could login and look at things for yourself. Just let me know if that’s something you would like to do.

Thanks again for your help.
- http://gehrcke.de Jan-Philip Gehrcke
  
  Jesse,
  
  as I have to get down to this problem, I really appreciate your offer. I hope this helps. Not everybody would do this :)
  
  Would you mind to send me an email to jgehrcke@googlemail.com with further instructions? I think I won’t manage to look into this before the end of the week, but better late than never.
  
  Thank you so much,
  
  Jan-Philip
- http://gehrcke.de Jan-Philip Gehrcke
  I just looked through your HTML output again and saw this:
```
...


If you have really typed it like this, then the solution is very easy :) Get rid of the needless code tag and use the plugin like


...


instead (without the additional space I included here). Let me know if this does it :)
```
  - http://byedesigns.com Jesse Bye
    
    Aha! That was the problem! I didn’t read your instructions closely enough to see that you said “pre” instead of “code”. Once I wrapped the code in just a pre tag, it worked exactly as expected. Thank you so much for your assistance!
    
    One thing I noticed now that its working is a little glitch in the styling of line numbers — the numbers are cut off (on the left), and all the lines have too much space between them (see the example page again). Any ideas?
    - http://gehrcke.de Jan-Philip Gehrcke
      
      Good, then issue 1 is solved :)
      
      Regarding the “optical” problems, there is some conflict between the CSS of your theme and the standard CSS of WP-GeSHi-Highlight. Your theme styles pre and ol generally, which overrides the styles of the plugin. I am not sure what I can do to avoid such things in the future. But for now, you definitely can adjust these two points:
      
      In the style.css of your WordPress theme, change around line 486 to
      
      #content p, #content ul, #content ol, #content dd, #content pre, #content hr {margin-bottom: 0;}
      
      And change around line 277 to
      
      ol {list-style: decimal outside none; margin: 0 0 18px 2.5em; }
      
      I found this using the “Firebug” plugin for Firefox, where you can edit CSS options very conveniently and see their effect in real time. You can try it out too and make it even better looking :)
      
      Perhaps you’ll even find a way of changing the standard CSS code of WP-GeSHi-Highlight to make things look good again, so that you don’t have to change the CSS of your theme. In this case, please let me know how you made it :)
http://www.bitterminion.com/ Nick

Love this plugin. But I notice that if I add xml to a post (inside a ‘pre’ block) then switch to the visual editor, the xml I just wrote gets severely truncated. I don’t know if the wordpress visual editor just doesn’t “like” xml code or if this has something to do with your plugin, but I was curious to get your input on the matter. Thanks!
- http://gehrcke.de Jan-Philip Gehrcke
  
  Hey Nick,
  
  hope you don’t mind that I modified your comment here :-)
  
  This is likely because the visual editor is simply not suitable for writing content on the “code level”. It creates HTML code itself in the output, so it doesn’t like HTML-like code (e.g. XML) in the input.
  
  I think that the issue you’re experiencing will happen even without my plugin.
  
  Maybe I didn’t state this clearly enough, but for using WP-GeSHi-Highlight and other plugins like this (that require writing code with <> letters), you should never use the visual editor.
  
  Within my WordPress installation, I even disabled the visual editor at all :-) To do this, see e.g. http://www.themelab.com/2008/05/17/how-to-get-rid-of-the-wordpress-visual-editor/
  
  Take this chance to learn some HTML! You will not regret.
http://www.bitterminion.com/ Nick

Ah, okay. Yeah, I kinda figured that it wasn’t your plugin, but yours is the first syntax highlighter I’ve used so I wasn’t sure. Thanks for the response!

And thanks for that link. But for some things, the visual editor is just easier. :)
http://alejandropalacios.net Alejandro Palacios

Thanks a lot for sharing this beautiful plugin Jan.

2 questions:

1) Within WordPress, can i change the height of the frame where the code is displayed ?
2) Is there a download for non-Wordpress users who want to use it in their websites ?

thanks again !
- http://www.theiceman.co.il/blog TIM
  
  Same here
- http://gehrcke.de Jan-Philip Gehrcke
  
  Hello Alejandro and Tim,
  
  thanks for using the plugin :-)
  
  The short answer for both of your questions is: 1) no and yes 2) no.
  
  The long answers:
  
  ad 1)
  The height of the ‘code box’ is chosen dynamically by the browser based on the height of the content and some static padding (top and bottom), which is defined via CSS code. You can change this CSS code either within the default CSS file wp-geshi-highlight.css or within the CSS file you are using. The padding you set there then is applied to all your code blocks.
  
  Do you think that being able to set this (top/bottom)-padding in a per-block-fashion via e.g. pre lang="x" padding="17px" is desired? Would definitely make some work to implement and, currently, I don’t see the huge benefit :)
  
  ad 2)
  This is a much too general question. As this is a WordPress plugin, the code of this plugin is adjusted to WordPress. So you cannot ‘simply’ apply this plugin to ‘other websites’. But, of course, there are ways to achieve syntax highlighting in the same fashion as this plugin does, even on non WordPress-based websites. Just tell me more about your case.
http://parametricity.net Roshan

Hi Jan,

I just started using your plugin. Is there some way that I can add keywords to code under a particular “pre” tag so that they get highlighted correctly? Lets say I am writing a blog entry about a particular shell command and “pre lang=”bash”" does not highlight this command name by default, is there someway that I can ask it to?

Similarly, can I remove keywords?

Thanks in advance,
Roshan

(Sorry about the last comment being completely unreadable – should have known better than to put actual “pre” tags in there)
- http://gehrcke.de Jan-Philip Gehrcke
  
  Hello Roshan :)
  
  GeSHi, the backend highlighting engine I am using in the plugin, allows for adding/removing keywords. Good news so far. Now, I see two possible ways to accomplish what you want.
  
  1) Dirty, but maybe fastest way for you for now: Look at http://qbnz.com/highlighter/geshi-doc.html#language-files to see how to define a language file. On your server, go to your plugins/wp-geshi-highlight/geshi/geshi directory. Regarding bash, you could copy bash.php to bash_custom.php and add your own keywords there. This is not exactly what you asked for, because it would work ‘semi-globally’, wherever you then use pre lang="bash_custom"… but it works :)
  
  2) I definitely see some way to realize exactly what you asked for: enable more arguments for the pre tag and forward them to the GeSHi API to add/remove keywords to specific keyword groups on the single code-block level. I could even think of let the user define new keyword groups. But this has to be done very carefully and definitely requires some time to accomplish and test. I don’t know if I can do this at the moment…
  
  So please, tell me if you’re lucky with solution (1). If not, I will have to see what I can do :)
  
  Jan-Philip
- leonnib4
  
  If you’re looking for simplicity try:
  
  http://wordpress.org/extend/plugins/wp-shkshell/
Pingback: My first WordPress plugin: WP-GeSHi-Highlight | gehrcke.de
http://parametricity.net Roshan

Hi Jan-Philip,

Thanks for your reply. I was able to create a custom bash.php as you suggested and this does solve my problem.

However like you say, it would be better to configure this in the body of the post. I am afraid I will quickly accumulate a large number of these custom files and that I will lose settings like this every time I make changes to the blog, reinstall the plugin etc. I have to take care to remember and back these up.

It would indeed be good if you could do this inline, or support some sort of post-level tag where these can be configured, such that they don’t have to be repeated for each code snippet within that post.

Thanks again,
Roshan

ps. Do consider enabling “Comment Reply Notification” for your blog here. That way I would have known as soon as you had replied.
- http://gehrcke.de Jan-Philip Gehrcke
  
  Hey Roshan,
  
  it’s good to have such suggestions. I definitely consider to implement what you propose. However, it will need time, because at the moment there are several entirely different things for me to do — with higher priority.
  
  I just installed the comment reply notification plugin, so hopefully you’ll get an email now :-)
  
  Jan-Philip
  - http://parametricity.net Roshan
    
    I did get your reply email. Thanks :)
    - http://gehrcke.de Jan-Philip Gehrcke
      Roshan,
      
      strict implementation of the add_keyword, remove_keyword, add_keyword_group, and remove_keyword_group methods allows the user to provide tons of parameters (indices, words, colors, …). I do not like doing this inline within the PRE tag, because there data cannot be structured properly. I think using some ini-file format would be a more appropriate solution. Hence, I’m thinking of something like this:
      
      [add_keyword] key = 1 word = rofl [add_keyword] key = 5 word = ugaga [add_keyword_group] key = 1 styles = ... case_sensitive = ... word1 = word2 = ...
      
      Such an “ini-string” is easy to create for the user and easy to parse from PHP. But how to provide this ini-string? I see two ways:
      
      1) Introducing a new “keywordcfgfile” argument to the PRE tag. There, you could point to an ini-file on your server, which then is read and parsed.
      2) Introducing a post-level start and end marker (like “–KEYWORD_DEF_START–” and “–KEYWORD_DEF_END–”), so that this ini-string could be provided at the beginning of the post.
      
      What do you think?
      
      Jan-Philip
Peter jung

Wondering what to do when the code itself contains
open and closing PRE tags. What do you recommend?
Peter
- http://gehrcke.de Jan-Philip Gehrcke
  
  Peter,
  
  this question drove me nuts for one day, where I wanted to find an easy way to get around this problem. There of course must be an intelligent solution. I did not investigate this deeply and, hence, did not find it yet. But this would mean a big rewrite, for sure — or I don’t see the obvious ;-)
  
  So, at the moment, you definitely must not use closing pre-tags within a code block at all. I’m sorry.
  
  Hopefully, I’ll come up with a more intelligent parser one day.
  - http://www.denoq.com/ Igor D.
    
    Please do not remove PRE tags if you want to be compliant with HTML specification. You can use CODE tags inside PRE (not the other way around). I just tested this with GeSHi and WP-GeSHi-Highlight and it’s working perfetly :)
    - http://gehrcke.de Jan-Philip Gehrcke
      Thanks for your opinion, Igor. Things are not perfect. I understand people trying to present code including PRE tags. And the only dirty solution there is so far, is not to use closing pre tags in the standard way. At the moment, you could e.g. insert a space between slash and pre:
      
      <pre></ pre>
- http://gehrcke.de Jan-Philip Gehrcke
  The obvious solution is so obvious… :D
  
  In your “code source” please use HTML escape sequences. At the same time, use the escaped="true" option in the corresponding pre tag. To demonstrate this, I’ll show you the same code block two times. Once without escaped="true" and once with.
  
  Without:
  <pre lang="text"> </pre>
  With:
  <pre lang="text"> </pre>
http://www.denoq.com/ Igor D.

Is there any way we can remove another_style-wrap 2,3,4,5 without changing plugin source? I did that to simplify style and created JQuery script to “show source”. You can see it on my website.
- http://gehrcke.de Jan-Philip Gehrcke
  Igor,
  
  the cssfile=none option removes too much, yes? You want to keep
  <div class="another_style-wrap"> <div class="another_style"> ...
  right?
  
  Currently, you can only do this within the source, as you did. Do you think I should introduce a parameter to change this behavior? In which way would you prefer to define this? Would this be something other users need, too?
  
  Thanks for your input,
  
  Jan-Philip
  - http://www.denoq.com/ Igor D.
    
    For myself I wanted to simplify things so it is easier to make “show source” with pure JQuery/HTML (no PHP solution). For others I am not sure. I can achieve all stylings with just one wrapper and for the shadows I need just one DIV. I don’t mind changing source – guess other users should also vote on this :)
http://parametricity.net Roshan

I like the idea of having a post level tag. A couple of reasons for this:

1) Usually this sort of per-post configuration is small.

For larger configurations, its perfectly ok to ask people to go create a custom format php (like you had originally asked me to do with bash.php.) There is no advantage to you duplicating that functionality and having to maintain all that code.

For an example of a small configuration take a look at my post about this tool called hg-gateway. The only keywords I needed to add were “hg-gateway” along with its subcommands.
http://parametricity.net/b/hg-gateway

2) More importantly the custom configuration of a post will be saved and tracked along with the post itself rather than be stored on random locations on the server.

—

A few more thoughts:

1) The syntax for the per post extension could be done in a more
HTML friendly manner. For example, enclose the ini format in HTML comments so that someday if your plugin stops working, the post is still readable and the ini formatting stays hidden.

2) You could still add extensions to the pre tag. I agree with your concern that this quickly gets ugly for large confirgurations, but for small ones, it should be simple. You can use the same naming conventions as your ini format. For example you could have the tags “add_keyword.word=” and “add_keyword.word=”. Btw wouldn’t it be better have:

[keywords]
level1=”word1,word2″
level2=”word3″
http://runtimeworld.com RunTimeWorld

Your plugin rocks! Just opened my blog and tested it, thanks a lot and keep up the good work!
http://www.gdunge.com Doug Weathers

Hi,

Thanks for the great plugin!

I have a question.

I don’t like how the default line numbering feature looks. Is there a way to get more of the GeSHi line numbering options, like the “fancy” version?

For an example of what it looks like on my site, see

http://www.gdunge.com/downloads/geshi-test

Thanks again!

- Doug
- http://gehrcke.de Jan-Philip Gehrcke
  Hey Doug,
  
  1) Regarding the line spacing, your WordPress theme screws up the default PRE style. See what it looks like on this page here:
  http://gehrcke.de/wp-geshi-highlight/#examples
  
  Your theme sets a huge lineheight and a huge margin-bottom. Get yourself a plugin for live-editing styles in your browser (like Firebug for Firefox) and change the responsible parts in your style.css. In your case, it’s around lines 470-480..:
  #content pre, #content kbd, #content tt, #content var { font-size: 15px; line-height: 21px; } style.css (Zeile 484) #content p, #content ul, #content ol, #content dd, #content pre, #content hr { margin-bottom: 24px; }
  A few comments above, another guy had similar problems and solved them as proposed: http://gehrcke.de/wp-geshi-highlight/comment-page-1/#comment-5376
  If you get your styling properly, your blog post about the “bad look” remains abundant :-) On a side note, there is no way to remove the dots, because I told GeSHi to use an ordered list to create line numbers. And browsers typically use numbers and dots for ordered lists.
  
  2) What do you mean by “more of line numbering options”? There is only “fancy” or is there more? In case of “fancy”, if you insist, I could introduce a new argument within the next version to enable “fancy” look… but I find that this is a needless feature :-) Convince me why people need it :)
  
  Thanks for your question and suggestion and I’m happy to read your answer ;)
http://www.gdunge.com Doug Weathers

Thanks for the quick reply!

I did some more looking around and found that the SyntaxHighlighter plugin (used on the WordPress.com site) looks more like what I want to see.

It’s less efficient and uses Javascript, but for now it’s the best-looking solution. I’ll revisit this issue if it becomes a problem.

You can see how SyntaxHighlighter looks on my blog at http://www.gdunge.com/2011/03/22/playing-with-pi.
http://www.blogwp.de Dennis

Hi Jan-Philip,

vielen Dank für dieses Plugin. Eine echte Alternative. Sobald ich genug Erfahrungen gesammelt habe, gibts einen Review ;)
- http://gehrcke.de Jan-Philip Gehrcke
  
  Danke für die Blumen :-)
http://csp.pcriot.com Laszló Tatai

Now here :

Here my code :

pre lang=”html4strict” line=”1″
html
head
/head
body
/pre
pre lang=”cpp” line=”5″

/pre
pre lang=”html4strict” line=”1″
/body
/html/pre
/p
- http://gehrcke.de Jan-Philip Gehrcke
  
  Please use HTML escape sequences in your original code block and the option escaped="true" in your pre tag.
- http://www.google.com/ Olivia
  
  At last! Someone with real exepritse gives us the answer. Thanks!
raumin

god ! Cant post these characters :s

< and >

http://uppix.net/b/a/b/078ecbfbcb8ac0a348f753c406187.png
- http://gehrcke.de Jan-Philip Gehrcke
  Akismet/WordPress seem to apply quite strict filters on comment “code” provided by non-registered users. I recommend to use HTML escape sequences and the option escaped=true.
  Use the following code:
  > <
  inbetween
  <pre lang="text" escaped="true">
  and
  </pre>
  It works :)
  –>
  > <
tiaurus
Unfortunately, this plugin also does not allow subscribers to comment embed code – it is cut. For example, the subscriber inserts the code: http://codex.wordpress.org/Function_Reference/get_currentuserinfo
and obtained:
user_login . "\n"; echo 'User email: ' . $current_user->user_email . "\n"; echo 'User first name: ' . $current_user->user_firstname . "\n"; echo 'User last name: ' . $current_user->user_lastname . "\n"; echo 'User display name: ' . $current_user->display_name . "\n"; echo 'User ID: ' . $current_user->ID . "\n"; ?>
- http://gehrcke.de Jan-Philip Gehrcke
  Hello!
  
  Sorry for the late reply. In fact, only non-registered users experience this problem and it seems it is either a filter by Akismet or WordPress. Anyway, it can be solved by
  1) using the HTML escape sequences < and > in the code block
  2) using the option escaped=true
  
  Do it like that:
  <pre lang="php" escaped="true"> [your php code including HTML escape sequences, see below] </pre>
  With the PHP code looking like:
  <?php global $current_user; get_currentuserinfo(); ?>
  The result is:
  <?php global $current_user; get_currentuserinfo(); ?>
  escaped="true" translates HTML escape sequences back to their special characters. So, if you experience problems like that it is not specific to this plugin. “Bad” character combinations, that could inject malicious code to the website, are filtered out… in all these cases it is a very good idea for you/your users to enter the HTML escape sequences > and < directly into the pre block.
http://vis4.net/ Gregor
Hey, danke für das Plugin. Funktionert auf Anhieb besser als das alte WP-Syntax. Eine Frage: mit GeSHi kann man ja auch relativ simpel einzelne Zeilen hervorheben. Super-praktisch in Tutorials u.ä. Soweit ich sehe, hast du das noch nicht in dein Plugin übernommen.
<pre lang="JavaScript" line="1" hightlight="2,4,8-9"> code </pre>
Wäre super wenn du das noch einbauen könntest. :)

Gruß,
Gregor
- http://gehrcke.de Jan-Philip Gehrcke
  
  Hey Gregor,
  
  I’m answering in English, so that everyone is able to follow :) Also, I’ve merged your two comments and I hope you are fine with that.
  
  Enabling highlighting is a very good suggestion! I will look into that as far as I find the motivation and time. It’s just that there is a lot of stuff at the moment with higher priority than working on this plugin (e.g. my PhD project).
  
  It will happen… and don’t hesitate bothering me again if it is really important for you :-)
  
  Jan-Philip
http://danieldosen.org Dan

Any chance you update the plugin to support markdown for editing text entries?
- http://gehrcke.de Jan-Philip Gehrcke
  
  Dan,
  
  I think a syntax highlighting plugin should not necessarily support something like markdown or restructured text. However, you are right and there should definitely be some plugin out there implementing these kinds of things.
  
  I would suggest searching the web for “wordpress + restructured text” or “wordpress + markdown” and then looking into something like this.
  
  JP
Pingback: WP-GeSHi-Highlight -- syntax highlighting with clean, small and valid (X)HTML review, discussions, does it work, and ratings on Loadwp.com | Loadwp.com
http://atrixnet.com Linux Rawkstar

Where’s the “donate” button? Let me show my thanks by providing you with a small token of my gratitude.
- http://gehrcke.de Jan-Philip Gehrcke
  
  Awesome. It’s funny.. for submitting a plugin to wordpress.com, one has to (or at least should) define a “donate” link. During that time, I’ve hidden my PayPal donate link here:
  
  http://gehrcke.de/donate/
  
  Thank you!
Glen

When CSharp code is rendered, the tab spacing is 8 instead of 4. Any ideas?
- http://gehrcke.de Jan-Philip Gehrcke
  
  Since WP-GeSHi-Highlight is using the pre-method, tabstops are rendered by your browser — there is nothing GeSHi can do for you.
  
  But there is something else…: maybe you know that there is a philosophical war between people fighting for tab indents in code (\t characters) vs. people saying that spaces are the one and only. I am one of the latter ones. So, if you like being able to define the “optical characteristics” of your code for every single displaying device or editor, then just use space-based indentation. Then, no ambiguity is left.
  
  JP
http://blog.jeremysmith.me.uk Jez

I have to say I think this code editors very good, first one I’ve used but I have to say it’s very good indeed.

Very well done also with regards to anyone not wanting to do HTML instead preferring to use the Visual Editor (WYSIWYG), why do coding? That’s my opinion anyways, I mean when I was at University I took about a week of just constant HTML editing to get myself used to the markup, one of my hates is when people call HTML and indeed CSS coding when it’s not coding at all it’s just presentation and markup, the only logic than can be used is when you want to use hacks to override settings if browser can’t display what you want.

I mean I never use anything like Dreamweaver or anything like that prefer to keep my HTML knowledgeable to myself where ever possible, just a personal feeling though, one of the apps I use for syntax highlighting is Notepad++ used to use Notepad2 but don’t like using that anymore.

But I am no visual designer I am a web developer so I stick to coding myself, doing a TCP network series of tutorials in integrating Flash as a multiplayer game format for TCP networks, so this code highlighters really good to illustrate what I want.
Carina Zona

The plugin’s css file, wp-geshi-highlight.css, does not seem to be registered with theme editor. I’ve tried activating various different themes to see if it’s a theme itself that’s at issue. But wp-geshi-highlight.css is never displayed in theme editor’s file list.
- http://gehrcke.de Jan-Philip Gehrcke
  
  Carina,
  
  sorry for the late reply. I’ve not “registered wp-geshi-highlight.css with the theme editor”, because I did not know that this is possible. Maybe I will look into that. Are you still requesting it? :)
Brad
JP, simple yet effective plugin. Thanks. I just wanted to find out if anyone is having the problem with losing the pre arguments once switching view from HTML to VISUAL in the post. What I am saying is for example, i have
```
 in the HTML view, once i switch to VISUAL and then back to HTML view, the syntax would go back to 
```
```
.  This is a problem when i have > and < all over the place.  Any idea?

thanks.
```
- http://gehrcke.de Jan-Philip Gehrcke
  
  Switching between the raw HTML editor and the visual editor is expected to cause problems. Please just don’t do it.
http://www.nuclex.org Markus Ewald

This plugin looks really good and from what I see in these comments, your support is just fantastic :)

I tried it on my blog and while it does work fine overall, it seems to escape HTML entities a second time (for example; < becomes &lt;). Personally, I like to put code with HTML entities into my <pre />-tags so the post stays valid HTML even without a syntax highlighter installed (otherwise, everything inside the <pre />-tags would be fair game and you couldn’t post an actual </ pre> without accidentally ending the code snippet /and/ producing invalid HTML).
- http://gehrcke.de Jan-Philip Gehrcke
  
  Markus,
  
  thanks for your inquiry. However, I am not sure if I properly understood the problem you’ve observed. Currently, I think that what you would like to accomplish (putting HTML entities in the pre block) is possible. Please look at these comments:
  
  http://gehrcke.de/wp-geshi-highlight/comment-page-1/#comment-6040
  
  http://gehrcke.de/wp-geshi-highlight/comment-page-1/#comment-6030
  
  If this does not help, I was too dumb to understand your problem :). In this case, please describe it again…
  
  Jan-Philip
http://www.nuclex.org Markus Ewald

Ah, I didn’t see the escaped="true" option. That does exactly what I want!
http://www.wpsquare.com/ Bharat Mandava

Fantastic plugin, its loading fast and displays code without any clutters.
Pingback: Kolorowanie składni » Paweł Mazur
http://tech.chitgoks.com/ chitgoks

do you have plans to add a collapse feature for the code?
- http://gehrcke.de Jan-Philip Gehrcke
  
  I don’t have those plans.
FreemanRU

From description: “Line numbers are not copied”
But it doesn’t work for IE9.
- http://gehrcke.de Jan-Philip Gehrcke
  
  You are right.
  
  More than a year ago, I tested this with IE8. Now, we have to accept that IE9 copies the numbers from numbered lists. Unfortunately, this behavior is out of our control.
http://www.narga.net Narga

Can you change the another css style by searching it in theme folder like wp-syntax. The theme developer will be include it in their theme instead upload it to plugin folder.
Please include all css code in another_style.css, in this version the css code display with html code.
- http://gehrcke.de/ Jan-Philip Gehrcke
  
  Please have a look at the current development version. The 1.0.8 release will prioritize CSS files found in the theme directory over those that are in the plugin directory.
Pingback: Wordpress: Sourcecode im Blogpost darstellen | BYTEBRAIN.DE | Tech Blog
Pingback: Wordpress GeSHi plugin optimization and modification. - no title
Du

Hi JP,
I also would like to use your plugin, but I’m unable to get it running! :S Would you mind taking a look?
- http://gehrcke.de Jan-Philip Gehrcke
  
  You have to be very precise about which steps you have performed and what exactly happened. Otherwise, it is not easy to help.
http://dev.cruel-gaming.com Tai

Plugin works brilliant, but I just noticed that when the post is on the front page it’s not getting converted, but when I click into the post to read the full post I see the syntax highlighting ?

Is this normal is there a way for me to have it work on the front page as well ?
- http://gehrcke.de Jan-Philip Gehrcke
  
  Tai, please excuse the late answer. Is this still an issue for you?
  - worldfinestmodels
    
    why can’t you have the default have the coloring and the numbers? was that really difficult? happens default is this white space and no number….also with the example you giving you never gave how it should be written exactly in worpress like ….i mean that is not cool at all
    - http://gehrcke.de/ Jan-Philip Gehrcke
      
      I have difficulties understanding your question. Please have a look at http://gehrcke.de/wp-geshi-highlight/#usage and try to reformulate your problem.
Pingback: WP-GeSHi-Highlight — syntax highlighting with clean, small and valid (X)HTML | Best Plugins - wordpress – widgets – plugin 2012
Mike Doherty

Is it possible to add support for inline code? Sometimes, you want to highlight just a few characters and not break out of the paragraph.
- http://gehrcke.de/ Jan-Philip Gehrcke
  
  Hello Mike,
  
  thanks for your questions.
  
  ad 1) “Inline code highlight” is possible, in general, yes — but not with the current version of WP-GeSHi-Highlight, I am sorry. I agree that it would be very convenient and seriously considered implementing it for a while already. I don’t however want to make wrong promises regarding the time frame. So, if you need it right now, please have a look at other solutions.
  
  ad 2) The language-specific CSS code is generated dynamically. Of course it would be possible to manage corresponding files in a cache-like fashion and to dynamically link to these files from the main HTML document. However, I do not see the advantages outweighing the associated overhead. Do you? :)
  
  HTH, Jan-Philip
Pingback: Notes on using GeSHi for syntax highlighting with WordPress and DokuWiki | Nifty Oddity