TYPO3 Core

This issue is still the case in TYPO3 6.2.15. Would be really nice if constants also supports multiline.

Now I'm forced to use setup field, but then I lose the inheritance that works with constants.

How to test:

Constants

lib.multiline (
line 1
line2
line3
)

setup

page.9 = TEXT
page.9.value = {$lib.multiline}

This will output "line 1" but should all lines.

I wanted to share my research:

Multiline constants actually do work (tested on latest master).
The line break and tabs are preserved.
However the constants value is replaced in the typoscript setup the linebreak will also be added causing it to be invalid typoscript.

The actual replacement happens inside the\TYPO3\CMS\Core\TypoScript\TemplateService::substituteConstants.

A constant

temp.multiTest (
Hello
  World
)

with typoscript

page.8 = TEXT
page.8.value = {$temp.multiTest}

results in

page.8 = TEXT
page.8.value = Hello
  World

So to fix this we need to change the \TYPO3\CMS\Core\TypoScript\TemplateService::substituteConstantsCallBack method to wrap the constants value in a multiline if it is multiline.

Please see https://github.com/TYPO3-Documentation/TYPO3CMS-Reference-TyposcriptSyntax/pull/12 and https://github.com/TYPO3-Documentation/TYPO3CMS-Reference-TyposcriptSyntax/pull/13 and latest https://github.com/TYPO3-Documentation/TYPO3CMS-Reference-CoreApi/pull/240