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From "Yanming Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FREEMARKER-84) Improve include directive to detect whether template exists
Date Thu, 01 Mar 2018 02:08:00 GMT

    [ https://issues.apache.org/jira/browse/FREEMARKER-84?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16381392#comment-16381392
] 

Yanming Zhou commented on FREEMARKER-84:
----------------------------------------

[~ddekany] Thanks very much, I have tested it, It's a awesome feature.

> 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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