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https://issues.apache.org/jira/browse/FREEMARKER-84?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16381088#comment-16381088
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Taher Alkhateeb commented on FREEMARKER-84:
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Hi Daniel. I know it's a very noob question (apologies) but I'm having a bit of
trouble understanding why GET_OPTIONAL_TEMPLATE_CC exists? My question is
purely for educational purposes.
> 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: Yanming Zhou
> Priority: Major
>
> 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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