refs https://github.com/TryGhost/Team/issues/1386
- The current match handler supports normal (in)equality operators, but no numeric comparisons (<, >, <=, >=)
- A use case for these new operators is to show the latest post in a separate way from other posts
Includes unit tests to check the new behaviour.
Run via `yarn test test/unit/frontend/helpers/match.test.js`
refs: https://github.com/TryGhost/Team/issues/759
- The match helper allows for basic equals and not equals comparisons,
Example:
{{match title "=" "Getting Started"}}
{{match slug "!=" "welcome"}}
- There's a lot more functionality we want to add here, so that it ends up being a replacement for {{#has}}
- However, this first iteration is already useful, especially in the context of custom theme settings
- Therefore we are adding it early, and will document it along with custom theme settings when that goes GA very soon
refs: https://github.com/TryGhost/Team/issues/759
- No matter what, a handlebars helper outputs a string. So if you return true, you'll always get 'true'.
- SafeStrings are handlebars's way of passing around a string whilst also maintaining a record of the original value e.g. new SafeString(true) results in {string: true}
- We need this for the match helper, so that we know when doing a comparison that we're meant to be comparing against a boolean true, not a string true
- Therefore, we need to putput SafeStrings, but also process them when passed in
The logic
- Figuring out the correct logic here has been a little tricky but essentially:
- {{match safestring}} with a single arg, will return true for any truthy value
- {{match safestring "=" true}} does a direct comparison with the original value of the safe string, so if it was a boolean true, the match will be true else false
- {{match (match something) "=" true}} will therefore work for any level of nesting
- this can result in slightly inconsistent results, but feels correct and documentable
This is documented extensively through the test cases
- The original intention of the proxy was to collect up all the requires in our helpers into one place
- This has since been expanded and used in more places, in more ways
- In hindsight there are now multiple different types of requires in the proxy:
- One: true frontend rendering framework requires (stuff from deep inside theme-engine)
- Two: data manipulation/sdk stuff, belongs to the frontend, ways to process API data
- Three: actual core stuff from Ghost, that we wish wasn't here / needs to be passed in a controlled way
- This commit pulls out One into a new rendering service, so at least that stuff is managed independently
- This draws the lines clearly between what's internal to the frontend and what isn't
- It also highlights that the theme-engine needs to be divided up / refactored so that we don't have these deep requires
- The frontend proxy is meant to be a way to pass critical internal pieces of Ghost core into the frontend
- These fundamental @tryghost packages are shared and can be required directly, hence there's no need to pass them via the proxy
- Reducing the surface area of the proxy reduces the proxies API
- This makes it easier to see what's left in terms of decoupling the frontend, and what will always need to be passed (e.g. api)
Note on @tryghost/social-urls:
- this is a small utility that helps create URLs for social profiles, it's a util for working with data on the frontend aka part of the sdk
- I think there should be many of these small helpers and we'll probably want to bundle them for the frontend at some point
- for now, I'm leaving these as part of the proxy, as need to figure out where they belong
closes: CORE-33
Two bugs:
- lodash isEmpty and handlebars util isEmpty are not the same
- I literally had the truthy and falsy cases the wrong way around 🙈
Notes:
- I have, for now, copied the isEmpty util from handlebars. It's so small it doesn't seem worth trying to require the util right now, although in future it'd be nice if that was easier to do
- Adding the management for the conditional being a SafeString allows the match helper to be a subexpression of itself, I can see this pattern being useful later in combo with the any and all helpers
refs: https://github.com/TryGhost/Team/issues/759
- wired up a matchHelper feature flag & used the labsEnabledHelper tool to gate the helper
- added a first version of the match helper, which is intended to replace the has helper
- this is an experimental helper and may or may not make it to GA
- match is a simple comparison helper, right now it does a very basic equals or not equals comparison
- much more functionality is needed to reach parity with has
