How to customize the line number style or prefix generated by the `linenumbers` filter in AnQiCMS template?

In AnQiCMS template development,linenumbersThe filter is a very practical tool that can help us automatically add line numbers to multi-line text content.This is very convenient when displaying code snippets, citing specific lines of text, or when line-by-line analysis is required.How does AnQiCMS template system support the style adjustment or prefix change of the generated line numbers?

First, let's take a look backlinenumbersThe basic usage of the filter. According to the AnQiCMS documentation, its main function is to number each line of multi-line text, with the default numbering format starting from 1 and using a period and space as a prefix, for example1./2..

linenumbersBasic usage of the filter.

Assuming you have a multi-line text content stored in a variable (for examplearchive.Content), you want to add line numbers to it, you can directly use it in the templatelinenumbersa filter like this:

<pre>
  {{ archive.Content|linenumbers|safe }}
</pre>

Whenarchive.ContentThe variable contains the following content:

这是一行文本。
这是第二行文本。
第三行内容比较长，
甚至还多了一行。

afterlinenumbersThe filter process will result in the default output:

1. 这是一行文本。
2. 这是第二行文本。
3. 第三行内容比较长，
4. 甚至还多了一行。

Here<pre>Tags are usually used to preserve text formatting, ensuring that line breaks are displayed correctly.safeThe filter is used to indicate to the template engine that the content is safe HTML and does not require escaping, which is particularly important for content that includes HTML tags.

Considerations for custom styles or prefixes

Now back to the core issue: how to customize the generated line number style or prefix?

According to the current template tags and filter document provided by AnQiCMS, we can find that,linenumbersThe filter does not provide any additional parameters to directly control the line number style (such as color, font size, boldness) or change the prefix (such as changing the1.is modified to[1]orLine 1:)。Its design tends to provide a standardized, out-of-the-box line numbering feature. This means that if you use it directly,{{ content|linenumbers }}The format of line numbers is preset and cannot be adjusted through filter parameters.

The ideas and limitations of indirectly implementing style customization.

ThoughlinenumbersThe filter itself does not provide direct customization parameters, but as website operators, we can still try some alternative solutions from other perspectives, although these solutions may bring some limitations.

1. Front-end CSS styling (with limitations):If the generated line number is inserted directly before each line of text as part of the text content, rather than enclosed in separate HTML tags (for example,<span>)，so it is very difficult to accurately select and style the line number part with pure CSS.CSS usually needs identifiable HTML elements (such as class names, IDs, or specific tags) to control precisely.

   However, if you wrap the entire text block with line numbers in a specific HTML container, for example<div class="code-block">...</div>You can apply a uniform style to all the text within this container (including line numbers and content), such as changing the font, color, or line height.But this cannot implement different styles for line numbers and content, nor can it change the prefix of line numbers.

   `html