Coloring Python Syntax Inside a Label automatically. (pygments package)

Ignition
1

Hi,

For training purposes, we would like to color python syntax inside a label. The pygments python package would work the best for me.

What are some best methods to import this package into ignition? (Linux and Windows)

pygments%20test
pygments%20test819Ă—694 26.6 KB

Below is an example on how to use the pygments package.

# Import packages!
from pygments import highlight
from pygments.lexers import get_lexer_by_name
from pygments.formatters import HtmlFormatter

# Lets get our python lexer.
lexer = get_lexer_by_name("python", stripall=True)
# Lets setup our Html Formatter.
formatter = HtmlFormatter(linenos=False, noclasses=True, nobackground=True)

# We can read code from any source (file or query...ect.).
code = 'print \'this is a test\''
# Format the python code for HTML
result = highlight(code, lexer, formatter)
# Copy and paste into Ignition Label
print('<HTML>'+result+'</HTML>')

RESULT (Can be copied and pasted into an ignition object to color syntax)

<HTML><div class="highlight"><pre style="line-height: 125%"><span></span><span style="color: #008000; font-weight: bold">print</span> <span style="color: #BA2121">&#39;this is a test&#39;</span>
</pre></div>
</HTML>
2

After a brief look in its source, I didn’t see any obvious gotchas. Try placing its code in your ignition install’s pylib folder and restart the service. Then try to import it in a console. If it uses anything specfic to python 2.7, you’ll have to wait for Ignition v8.

3

Thanks for the help! The windows directory is easy to find but I want to make sure it is pointing at /var/lib/ignition/user-lib/pylib. Like these two directories are equal?

(windows)
C:\Program Files\Inductive Automation\Ignition\user-lib\pylib
(linux)
/var/lib/ignition/user-lib/pylib

4

Yes, that’s the right location in either case. (It can be different on linux, too, if someone does a manual install from the zip file.)

1 Like