Support specifying the increment strategy for current-version

[davidafsilva]

Description

Support an optional argument on current-version that enables clients of vergo to specify the increment strategy instead of always using minor.

vergo/release/release.go

Line 139 in 69533b6

pre, err := version.IncMinor().SetPrerelease("SNAPSHOT")

Use-Cases

Provide properly versioned snapshot releases according to the change being made to the application.

We use this to provide versions of libraries that are built as part of a change request (PR) being submitted.

Axion

# XXX = Patch|Minor|Major
# and then some more, but we're only really interested in these three
gradle currentVersion -Prelease.versionIncrementer=incrementXXX

Notes

I already have the changes made to a local branch, but I do not seem to have the required permissions to push it to the remote.

[LukaFenir]

Pre-release version would be useful as well (eg. alpha1, prerelease3). Could it be added to your local changes? Otherwise, can raised a new issue to implement after your changes are merged.

[LukaFenir]

There's an issue for pre release version already: #1

[davidafsilva]

Hey @LukaFenir,

Sorry for the late reply but, at first sight, I'd say to add that support in a different PR given the broad context of pre-releases.

My understanding is that pre-releases are used for a couple of different use-cases, from the top of my head:

1. Deliver release candidates (or alpha/beta) before GA
2. Markers for the next release (skip versions)

Are we looking to add support for 1. or maybe both?

Just for completion, Axion supports both:

1. via the following config:

   scmVersion {
       versionIncrementer(
           "incrementPrerelease",
           mapOf("initialPreReleaseIfNotOnPrerelease" to "rc1")
       )
   }

   (not sure if they support via project properties as I don't see any for initialPreReleaseIfNotOnPrerelease and it is required for the first tag)
2. via gradle markNextVersion (by default the suffix is alpha iirc)

   scmVersion {
       nextVersion {
           suffix.set("alpha")
           separator.set("-")
       }
   }