Snapshot template that honors SemVer

[zam6ak]

I have a simple project with master branch and each release is tagged.
However, I am trying to figure out how name snapshots properly so that it follows SemVer.

Imagine you release (and tag) v1.0.0
The next patch release could undergo several snapshot builds before final v1.0.1 release
So there will be for example:
v1.0.1-alpha.0
v1.0.1-alpha.1
v1.0.1-alpha.2
and then finally
v1.0.1
which is then tagged in the repo

My issue is that because of snapshot template, I am getting the v1.0.0-alpha.0 and so on because that is the only released tag in the repo

Is there a way to adjust the template so that it uses proper semver without having to tag each snapshot build in the repo?

This is what I use now:

snapshot:
  name_template: "{{ .Tag }}-alpha-{{.ShortCommit}}"

I could remove tag from template and mess with Major and/or Minor, but I suspect someone has an easier way...

Thanks

[zam6ak]

Would be awsome if one could "apply" a function to .Tag...
Something like (using NPM "semver" command syntax here)

snapshot:
  name_template: "{{semver --preid alpha --increment prerelease .Tag }}-{{.ShortCommit}}"

This would result (if v1.0.0 is last tag in repo) in
1.0.1-alpha.0-4c7af85

[caarlos0]

would this help? #1457

[caarlos0]

cc/ @zam6ak

[zam6ak]

that would help!

[caarlos0]

that's not possible right now, but I think we can add template functions like incmajor, incminor and incpatch

[zam6ak]

not sure how flexible this would end up being (ir. being able to specify suffix)

[caarlos0]

on your example:

snapshot:
  name_template: "{{semver --preid alpha --increment prerelease .Tag }}-{{.ShortCommit}}"

would be something like

snapshot:
  name_template: "{{ .Tag | incpatch }}-alpha.{{.ShortCommit}}"

(or something like that)

---

does that work?

[zam6ak]

I think it would except in cases of prerelease...How would you specify "moniker" used for "rc" or whatever else people may be using....

[caarlos0]

in that case you don't need snapshots... just tag with the 1.2.3-rc.blah and configure release.prerelease to auto: https://goreleaser.com/release/

[zam6ak]

Was just thinking....would it be possible to have values of the template "piped" through external script or command? That way anyone could modify .Tag (or any other part of the template) without having to implement new fn each time need arises.

[caarlos0]

sorry, I didn't understand what you mean... can you elaborate?

[zam6ak]

Let's say you have semver utility installed and in your path
Then having function that would allow value of the tag to be used by such external utility

{{ .Tag | extexec  "semver --preid alpha --increment prerelease" }}

Here you would only implement extexec which can be used with whatever external utility someone wants to use to manipulate value of the tag...

[caarlos0]

you can do that with

SEMVER="$(semver --preid alpha --increment prerelease)" goreleaser

and then use {{ .Env.SEMVER }} on templates...