Pygments command line not syntax highlighting HTML output

Question

I am trying to take a python script and prepare it for paper printing with syntax highlighting and line numbering. I have used the following command line instruction:

pygmentize -f html -O style=colored,linenos=1 -l python -o <file>.html <file>.py

This instruction runs without errors but no matter how I indicate the style and the lexer, the output HTML never has syntax highlighting at all. It is appropriately formatted with correct indentation and line numbers, but I cannot get it to match the coloured syntax highlighting displayed when using the pygments demo, or any colours.

I have also tried different aliases of python (such as py, python3 and py3) and different styles, but the HTML is always the same. For what it's worth, I am using PowerShell on Windows 10 to run the instruction and Google Chrome to view the output HTML (though I have also checked with Edge and don't see any difference).

I would also like an answer to this question. I was running this on Linux, so maybe this is a pygmentize issue? For what its worth using the python module instead of the pygmentize CLI did work (so maybe its a bug in the CLI?): pygments.highlight( open(fpath, 'r').read(), lexer=pygments.lexers.get_lexer_by_name('python'), formatter=pygments.formatters.html.HtmlFormatter( noclasses=True, style=pygments.styles.get_style_by_name('default') ) ) — Erotemic
– Erotemic, Commented Jul 13, 2020 at 15:20

Erotemic · Accepted Answer · 2020-07-13 15:24:57Z

7

While writing my above comment, I actually found the solution. I dug into the javascript code to find the actual python call to make the python implementation work. In that notice how there is a noclasses=True as a formatter option.

I have no idea what noclasses does, but if you add it to the CLI as a formatter option then the output is colored correctly:

pygmentize -l python -f html -O style=default -O noclasses=True -o <file>.html <file>.py

answered Jul 13, 2020 at 15:24

Erotemic

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2 Comments

user1556435 Over a year ago

The default (without noclasses) outputs HTML elements with solely a classname so that using CSS one can apply styling to the fragments. noclasses changes that behaviour to write the styles inline into the HTML element definitions.

colin lamarre Over a year ago

all you really need is -O noclasses=True looks like, thanks!

arash · Accepted Answer · 2024-12-08 18:40:26Z

according to the documentation you should pass the full option, i.e. -O full to your command in order to render the HTML file with color style. see the difference. first when you don't use the full option:

<div class="highlight"><pre><span></span><span class="k">fn</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="nb">Result</span><span class="o">&lt;</span><span class="p">(),</span><span class="w"> </span><span class="nb">Box</span><span class="o">&lt;</span><span class="k">dyn</span><span class="w"> </span><span class="n">Error</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">poll</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Poll</span><span class="p">::</span><span class="n">new</span><span class="p">()</span><span class="o">?</span><span class="p">;</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">events</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Events</span><span class="p">::</span><span class="n">with_capacity</span><span class="p">(</span><span class="mi">1024</span><span class="p">);</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="n">addr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;127.0.0.1:8080&quot;</span><span class="p">.</span><span class="n">parse</span><span class="p">()</span><span class="o">?</span><span class="p">;</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">server</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">TcpListener</span><span class="p">::</span><span class="n">bind</span><span class="p">(</span><span class="n">addr</span><span class="p">)</span><span class="o">?</span><span class="p">;</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">unique_token</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">connections</span><span class="p">:</span><span class="w"> </span><span class="nc">HashMap</span><span class="o">&lt;</span><span class="n">Token</span><span class="p">,</span><span class="w"> </span><span class="n">TcpStream</span><span class="o">&gt;</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">HashMap</span><span class="p">::</span><span class="n">new</span><span class="p">();</span>

and then if you use full option:

      <style type="text/css">
/*
generated by Pygments <https://pygments.org/>
Copyright 2006-2024 by the Pygments team.
Licensed under the BSD license, see LICENSE for details.
*/
pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
body .hll { background-color: #ffffcc }
body { background: #f8f8f8; }
body .c { color: #3D7B7B; font-style: italic } /* Comment */
body .err { border: 1px solid #FF0000 } /* Error */
.
.
.
body .vc { color: #19177C } /* Name.Variable.Class */
body .vg { color: #19177C } /* Name.Variable.Global */
body .vi { color: #19177C } /* Name.Variable.Instance */
body .vm { color: #19177C } /* Name.Variable.Magic */
body .il { color: #666666 } /* Literal.Number.Integer.Long */

  </style>
</head>
<body>
<h2></h2>

<div class="highlight"><pre><span></span><span class="k">fn</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="nb">Result</span><span class="o">&lt;</span><span class="p">(),</span><span class="w"> </span><span class="nb">Box</span><span class="o">&lt;</span><span class="k">dyn</span><span class="w"> </span><span class="n">Error</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">poll</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Poll</span><span class="p">::</span><span class="n">new</span><span class="p">()</span><span class="o">?</span><span class="p">;</span>
<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">events</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Events</span><span class="p">::</span><span class="n">with_capacity</span><span class="p">(</span><span class="mi">1024</span><span class="p">);</span>
.
.
.

there is a command to get the default CSS style of pygmentize:

pygmentize -S default -f html > style.css

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