[FreeMarker-user] How to modify macro paramater value and send it to another macro ?

[Albert Kam]

I would like to pass a hash to a macro, modify the hash's sequence value
within the macro, and then pass the modified hash to another macro.

I have put on a simple example to illustrate with 'non' freemarker comments
:

// try to add 'java' to plugins.tools sequence and pass it to @print
// but still the plugins passed to @print doesnt contain 'java'
<#macro printAndModify plugins>
${plugins.project} uses <@printList plugins.tools />
<#local tools=plugins.tools
tools=tools + ['java']
'plugins.tools'=tools>
<@print plugins />
</#macro>

<#macro print plugins>
${plugins.project} uses <@printList plugins.tools />
</#macro>

<#macro printList list>
<#list list as item>${item} </#list>
</#macro>

<#assign plugins={'project' : 'cool project', 'tools' : ['freemarker']}>

<@printAndModify plugins />


The output of the project is :

cool project uses freemarker

cool project uses freemarker


The expected output is :

cool project uses freemarker

cool project uses freemarker java

Is there anyway to do this in the ftl ? Thank you.

[Daniel Dekany]

Post by Albert Kam
I would like to pass a hash to a macro, modify the hash's sequence
value within the macro, and then pass the modified hash to another macro.
<#macro printAndModify plugins>
<#local tools=plugins.tools
tools=tools + ['java']
'plugins.tools'=tools>
</#macro>

<#local 'plugins.tools'=tools> just creates a local variable called
"plugins.tools".

You can do this like:

<#macro printAndModify plugins>
${plugins.project} uses <@printList plugins.tools />
<@print plugins + { 'tools': plugins.tools + ['java'] } />
</#macro>