Truncating Strings in Golang Templates

In Golang HTML templates, it is possible to truncate text displayed using the {{ .Content }} expression . For instance, consider the following template:

{{ range .SomeContent }}
 ....
    {{ .Content }}
 ....

{{ end }}

Currently, {{ .Content }} outputs a lengthy string:

Sometimes hunger is noticed and before it is first in the throat. Sometimes it's time to put it on itself, or it's a layer of felis vulputate. Until the ultricies were pure, they did not have any medicinal value. The entire arc of my life. Pellentesque a ipsum quis velit venenatis vulputate vulputate ut enim.

To truncate this string to 25 characters, you can use printf within the template:

{{ printf "%.25s" .Content }}

Alternatively, you can provide the truncation length as a separate integer argument to printf:

{{ printf "%.*s" 25 .Content }}

Note that the truncation operation measures the length of the string in Unicode code points (runes), unlike the C printf function, which measures in bytes.