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https://issues.apache.org/jira/browse/FREEMARKER-84?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247632#comment-16247632
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Daniel Dekany edited comment on FREEMARKER-84 at 11/10/17 3:26 PM:
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We could do Proposal 1 (the others aren't consistent with the logic of FTL).
Maybe {{.last_include_found}} is a more speaking variable name.
Another approach that's consistent with FTL is adding a new directive, which
always has nested content:
{code}
<#include_or_fall_back "try-this.ftl" >
Do this if it wasn't found.
</#include_or_fall_back>
{code}
The result is much terser than Proposal 1, but it adds a new directive, which
is maybe an overkill.
was (Author: ddekany):
We could do Proposal 1 (the others aren't consistent with the logic of FTL).
Maybe {{.last_include_found}} is a more speaking variable name.
Another approach that's consistent with FTL is adding a new directive, which
always has nested content:
{code}
<#include_or_fallback "try-this.ftl" >
Do this if it wasn't found.
</#include>
{code}
The result is much terser than Proposal 1, but it adds a new directive, which
is maybe an overkill.
> Improve include directive to detect whether template exists
> -----------------------------------------------------------
>
> Key: FREEMARKER-84
> URL: https://issues.apache.org/jira/browse/FREEMARKER-84
> Project: Apache Freemarker
> Issue Type: Improvement
> Components: engine
> Affects Versions: 2.3.27-incubating
> Reporter: zhouyanming
>
> I requested feature `ignore_missing=true` of <#include> and freemarker have
> implemented it, but it cannot handle fallback like
> {code}
> <#assign path="relative.ftl">
> <#if isTemplatePresent(path)>
> <#include path>
> <#else>
> template "${path}" is not exists
> </#if>
> {code}
> Proposal 1:
> Introduce a new special variable like "template_included" similar to "$?" of
> shell exit code
> {code}
> <#include path ignore_missing=true>
> <#if !.template_included>
> template "${path}" is not exists
> </#if>
> {code}
> Proposal 2:
> Add an argument like "template_included" for include directive
> {code}
> <#include path ignore_missing=true template_included="pathExists">
> <#if !pathExists>
> template "${path}" is not exists
> </#if>
> {code}
> Proposal 3:
> Introduce a new special directive such as <#missing> similar to html
> <noscript> tag
> {code}
> <#include path>
> <#missing>
> template "${path}" is not exists
> </#missing>
> </#include>
> {code}
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