On 11/04/2018 17:16, Yuya Nishihara wrote:
On Wed, 11 Apr 2018 11:36:05 +0200, Feld Boris wrote:
The proposal here is to define a prefix for which we break backward
compatibility. If we do so, people with a "<set>" label will have to use:


to get a similar effect.
IIRC x:y was the most important syntax that needed a strong BC guarantee, so
this proposal doesn't sound good.
Indeed, the `x:y` is important and we don't want to break the BC
guarantee of it.

The proposal is less impacting, only people using 'set' as labels and
using it at the beginning of a revsetwould be impacted. This prefix has
the advantage of being concise and coherent with whatfilesetuse.
Doesn't '-r set:foo' look like a range?

I don't like an idea of introducing another ambiguous syntax to resolve
ambiguity, but furthermore "set:foo" seems confusing to humans.

IIUC, we have "set:" for filesets only because that's the syntax to specify
file patterns. If we really want to add something to force revset evaluation,
I think it has to be compatible with the current syntax, such as "(EXPR)" or

`(EXPR)` seemtoo likely to introduce a BC breakage, as people are more likely to have a tag that looks like `(xxx)` than a 'set' tag IMHO.

In a previous discussion, you pointed out that `revset(EXPR)` would be painful because we would have to escape everything within EXPR. What makes you consider it again? Do you mean that if a revset has this form `revset((.*))`; we just evaluate the contents inside parenthesis?

Agreed that `set:foo` looks like a range, maybe we need to use a less ambiguous operator?

`#revset# foo+bar`

(Nothing really stands out as pretty, but trying to extend our search area here.)

Since "foo(bar)" needs quotes in revset query (except for x and x:y), it would
makes some sense to add an option to disable the compatibility hack at all.
We cannot see a way to make the config option both easily discoverable
and constrained. There is lot of labels that includes `-`, `+` and other
symbols that will be impacted.

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