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truncatechars filter

Author:
semente
Posted:
September 3, 2009
Language:
Python
Version:
1.1
Tags:
template filter truncatewords
Score:
3 (after 3 ratings)

Truncates a string after a certain number of chars.

Question:

Why don't you use the built-in filter slice?

I need the "three points" (...) only when it really truncates.

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from django import template
from django.template.defaultfilters import stringfilter

register = template.Library()

@register.filter(name='truncatechars')
@stringfilter
def truncatechars(value, arg):
    """
    Truncates a string after a certain number of chars.

    Argument: Number of chars to truncate after.
    """
    try:
        length = int(arg)
    except ValueError: # Invalid literal for int().
        return value # Fail silently.
    if len(value) > length:
        return value[:length] + '...'
    return value
truncatechars.is_safe = True

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Comments

sunn (on September 4, 2009):
<p>An interesting feature would be if it only cuts whole words - like truncatewords but for chars (length then becomes the maximum length including ...)</p>

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allcaps (on September 4, 2009):
<p>The interesting feature with a little problem.</p> <p>Replace: return value[:length] + '...'</p> <p>With: return value[:length].rsplit(" ", 1)[0] + ' ...'</p>
<pre>>>> truncatechars("Hello World", 6) 'Hello ...' </pre>
<p>If the length of the first word is greater or equal to arg, there is an undesirable space! >>> truncatechars("Hello World", 4) 'Hell ...'</p>

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