Hi all,
regarding issue #2594 "Template system should handle whitespace
better" explaining the need for some kind of (optional) whitespace
stripping from the output of templates, I've been looking at the
proposed solutions and compared them to other template and macro
engines.
In particular, a historical but still widely used and general-purpose
macro engine is m4. Its own feature for controlled newline stripping
is the "dnl" reserved word, "Discard to Next Line." It works by
"chomping" all input until and including the next newline.
For example, to call a macro foo() without copying over the newline
that appears after the macro call in the template, a m4 programmer
would write:
foo('bar`, `whatever')dnl
An equivalent feature in Django templates would enable template
developers to strip newlines from specific lines, while keeping
backwards compatibility with existing templates.
So if the general idea is well-accepted, I propose the "{#" token. The
example from the issue would become:
<ul>
{% for item in items %}{#
<li>{{ item }}</li>
{% endfor %}{#
</ul>
It is already a reserved token in the template system, so it's not
going to break anything. The existing comment syntax {# ... #} is
already restricted to single-line comments, so there are no multi-line
comments that would break. Plus, I'd wager it could be implemented
quite efficiently.
What do you think?
Tobia
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