Implement all filters

[TechMagister]

trafficstars

Filters

• [x] abs
• [x] append
• [x] capitalize
• [x] ceil
• [x] compact
• [x] date
• [x] default
• [x] divided_by
• [x] downcase
• [x] escape
• [x] escape_once
• [x] first
• [x] floor
• [x] join
• [x] last
• [x] lstrip
• [x] map
• [x] minus
• [x] modulo
• [x] newline_to_br
• [x] plus
• [x] prepend
• [x] remove
• [x] remove_first
• [x] replace
• [x] replace_first
• [x] reverse
• [x] round
• [x] rstrip
• [x] size
• [x] slice
• [ ] sort
• [ ] sort_natural
• [x] split
• [x] strip
• [x] strip_html
• [x] strip_newlines
• [ ] times
• [ ] truncate
• [ ] truncatewords
• [ ] uniq

[exts]

Going to try helping where I can :), already did my first PR for downcase.

[TechMagister]

Thanks for your contribution 🍰

[exts]

As for the map filter, I don't think that's possible in crystal since you can't call properties/methods dynamically unless you know a way to do it with macros?

[TechMagister]

Using the [] operator can be a solution, but it means that the map filter will be restricted to hash :/

[exts]

Maybe this could be a reason for them to support this feature in the language? I ran into a similar issue when trying to create php style dynamic controller/actions as well and was forced to use a single method as the solution :/

I almost had a breakthrough though, basically i found out that constant arrays can be used dynamically in {% for ... %}{% end %} macros, only problem is idk how to create a single value array constant at compile time w/ the data we'd need to run that loop.

[exts]

actually now looking at the liquid source, it looks like they only really support Enumerable's w/ the map option that responds to []

Guess like you said, that'll have to do for now.

My current solution: https://github.com/exts/liquid.cr/commit/c03a643d26afb8a90e310285d491034d38846d32 will push later once I add more filters.