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Clean ivy--regex-plus' to prepare to ivy--regex-plus-ignore-order' #344

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Konubinix
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The current implementation of ivy--regex-ignore-order' does not take into account the '!' character likeivy--regex-plus' does.

When trying to implement the '!' behavior in ivy--regex-ignore-order', I realized that it behaves more likeivy--regex' in the sense that it provides a way to create regex out of a string.

I also realized that ivy--regex-plus could be considered as a thin wrapper around "something that returns regex" and added the behavior of '!'. I thought that it could be a good idea to use it around ivy--regex-ignore-order also.

Unfortunately, ivy--regex-plus is difficult to work on since it returns either a string or a list of cons (let's call it a ivy style regex :-)). Also, it assumed that the called function (ivy--regex) returned a string and not an ivy style regex.

The purpose of this patch is to make `ivy--regex-plus' cleaner, not relying on the assumption that the called function returns a string.

To do that, I added ivy--regex-normalize that is fed with either a string or a ivy style regex and return a ivy style regex. Then ivy--regex-plus makes use of it.

I don't know yet how to customize ivy--regex-plus to use either ivy--regex or ivy--regex-ignore-order, but now, I feel that the base is clean enough to do this.

It now only returns the part of the regex list that indicates to
ignore foo. The part accepting nothing is useless.
…cleaner

Now, `ivy--regex-plus' doesn't have anymore to construct the list and cons. It
relies on the `ivy--regex-normalize' and barely aggregate the result.
@abo-abo
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abo-abo commented Jan 12, 2016

Thanks for the effort, but it's really not a good change:

  1. $ make test fails: swiper--re-builder depends on a certain structure of ivy--regex-plus.
  2. The ("" . t) part is necessary since "" is what will be used for swiper--add-overlays and in other places.
  3. The name ivy--regex-normalize implies that it maps a regex string to a regex string, which isn't so.
  4. In ivy--regex-plus, ivy--regex must not be called for the non-matching part, or at least it should be called before the call on the matching part. This is because ivy--regex isn't a pure function and has a side-effect of setting ivy--subexps.
  5. Finally, I like to introduce a new function when it's called at least twice (preferably more). The exception is breaking a function that doesn't fit on the screen into parts.

Please don't take it as offense, I usually try to clean up and salvage contributions, but there's nothing that I can keep from this one.

@Konubinix
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No problem. As mentioned, my initial attempt was to add the '!' behavior into ivy--regex-ignore-order. I though that this cleaning would help doing that, but I obviously did not understand all the impacts of the change.

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2 participants