Update dependency constraint to allow for liquid v5.0.0

[jekyllbot]

Hey there! 👋

I noticed that the constraint you have for liquid doesn't allow for the latest version to be used.

The constraint I found was ~> 4.0, and the latest version available is 5.0.0.

Can you look into updating that constraint so our users can use the latest and greatest version? Thanks! 💞

[jaredcwhite]

FWIW, we had to make a breaking change to support Liquid 5. bridgetownrb/bridgetown#224

Seems that for conditionals (aka in the where filter), '', blank, and empty are now all equivalent, since there's no clear way to detect '' vs. blank/empty.

[ADTC]

I was also wondering why Jekyll isnt using Liquid 5 yet. What do Shopify/liquid maintainers say about the breaking change?

[DirtyF]

@jaredcwhite Thanks for the tip, our test suite is still failing when I apply your fix 🤷 also Liquid-c 5.0 hasn't been released yet.

[SimonEast]

Is there a way to force my Jekyll installation to use Liquid 5 or 5.1? Liquid performance is pretty poor in the current Jekyll release, and I'd like to see if the later versions have improved performance.

[ashmaroli]

Is there a way to force my Jekyll installation to use Liquid 5 or 5.1?

@SimonEast No, Officially, you can't force Jekyll to use Liquid 5+.

However, there is a workaround (via a nasty hack).

• Clone the Liquid repository.
• Checkout one of the release-tags (v5.1.0 / v5.0.1 / v5.0.0) (if you don't want to use unreleased changes).
• Change the vesion-string in lib/liquid/version.rb to be something in the 4.x series.
• Update your Gemfile to use the local clone:

  # Gemfile
  
  gem "liquid", path: "path/to/local_repo"

• Then invoke Jekyll via Bundler. e.g. bundle exec jekyll build

[unfor19]

@ashmaroli Thank you for this! I've added your solution to my Makefile + Gemfile files

Makefile

.EXPORT_ALL_VARIABLES:
ROOT_DIR=${PWD}
LIQUID_VERSION=v5.3.0
LIQUID_PATH=${ROOT_DIR}/.liquid-${LIQUID_VERSION}
LIQUID_LIB_PATH=${ROOT_DIR}/${LIQUID_PATH}/lib
LIQUID_VERSION_PATH=${LIQUID_LIB_PATH}/liquid/version.rb

ifneq ("$(wildcard /${LIQUID_VERSION_PATH})","")
LIQUID_VERSION_PATH_EXISTS=true
else
LIQUID_VERSION_PATH_EXISTS=false
endif


fix-liquid:
	@if [ ${LIQUID_VERSION_PATH_EXISTS} = true ] ; then \
		git clone  --branch ${LIQUID_VERSION} https://github.com/Shopify/liquid.git ${LIQUID_PATH} && \
    	cd ${LIQUID_PATH} && \
    	git switch -c ${LIQUID_VERSION} && \
    	sed -i.bak 's~${LIQUID_VERSION}~4.0.3~' ${LIQUID_VERSION_PATH} ; \
	fi

bundle-jekyll: fix-liquid
	pwd
	ls -lh
	bundle exec jekyll build
	ls -lh

Gemfile

gem "jekyll", "~> 4.2.2"
gem "liquid", "4.0.3", path: ".liquid-v5.3.0"