trimprefix

trimprefix(str string, prefix string) string

variable "tag" {
  description = "Git release tag (e.g. v1.4.2)"
  type        = string
}

computed "version" {
  description = "Bare version number without the v prefix"
  expression  = trimprefix(var.tag, "v")
}

task "package" {
  description = "Build release archives with the bare version"
  commands = [
    "go build -ldflags \"-X main.version=${computed.version}\" -o bin/app ./cmd/app",
    "tar -czf myapp-${computed.version}-linux-amd64.tar.gz bin/app",
  ]
}