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https://issues.apache.org/jira/browse/FREEMARKER-82?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16222211#comment-16222211
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Daniel Dekany commented on FREEMARKER-82:
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More intelligent indentation would be a great feature for sure, but that
involves deciding the indentation on run time. Back then when I was thinking
about it, and found that you ran into limitations if things just print into a
`Writer` internally. Instead, you need a stream of fragments with richer
semantics, so that you can tell if a fragment is indentation that might can be
removed, and so on. As not using a `Writer` in API-s like
`TemplateDirectiveModel` is not backward compatible, this issue was postponed
to FreeMarker 3 (which however haven't yet reached the state where this will be
attempted). But maybe there's a less perfect solution that works with
`Writer`-s... I don't know, will have to think about it. (Also, I tried it
without any directives, just generating the output that a human would expect.)
> A new whitespace tag to indicate the baseline indentation for <@macro> and
> includes.
> ------------------------------------------------------------------------------------
>
> Key: FREEMARKER-82
> URL: https://issues.apache.org/jira/browse/FREEMARKER-82
> Project: Apache Freemarker
> Issue Type: Wish
> Components: engine
> Reporter: Brent
>
> Sometimes, perhaps most of the times, it is useful to split up small pieces
> of my template into macros or otherwise other templates to include.
> However, since V2.3, lines containing only FTL tags get trimmed. This is
> annoying because I may want to include a macro or another template, with the
> current indentation of where I call it.
> This brings me to my next point, as shown in [my answer on
> StackOverflow|https://stackoverflow.com/a/46973468/2686165], it is possible
> to keep this indentation with <#nt>, but this only works for the first line
> of the macro (see SO answer at the bottom).
> So I propose an easy way to say "use the current indentation of the line, as
> a base of all the indentation for my macro or included template.
> Any indentation inside the included template, or the macro would be relative.
> If one wished to break the relative indentation for a line inside their
> included template or macro, another tag should be foreseen to indicate that.
> New tags:
> * To indicate an indentation base for templates/macros
> * To indicate that a line inside the included template/macro must not use the
> indentation base (so you can put lines that don't follow the indentation,
> perhaps <#t> already provides this functionality)
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