Does not expand variables during first iteration #287

Hi

I wanted to generate a sort of semantic version using the following scheme: tag is major.minor and use number of commits on top of tag as patch part of sem ver.

So I did something like this:

version: '2'

vars:
  tag:
    sh: 'git describe --tags --abbrev=0'
  commits_on_top_of_branch:
    sh: "git rev-list '{{.tag}}'.. --count"

tasks:
  default:
    cmds:
      - echo '{{.tag}}'.'{{.commits_on_top_of_branch}}'

But this taskfile will generate an error

fatal: ambiguous argument '<no value>..': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
task: Command "git rev-list '<no value>'.. --count" in taskvars file failed: exit status 128

That's because the iteration (expansion) of merge doesn't respect variables resolved in the same expansion cycle because templater doesn't reset its a sort of cache:

merge cycle:
https://github.com/go-task/task/blob/master/internal/compiler/v2/compiler_v2.go#L55-L73

here strMap is like a cache which is never reseted
https://github.com/go-task/task/blob/master/internal/templater/templater.go#L32-L34

Is there any workaround for it except these two:

• git rev-list $(git describe --tags --abbrev=0).. --count because it means git describe is called two times (one for tag)
• git rev-list '{{.tag}}'.. --count || true