compact

compact(list list(string)) list(string)

variable "build_arg_proxy" {
  description = "HTTP proxy for Docker builds (optional)"
  type        = string
  default     = ""
}

variable "build_arg_no_proxy" {
  description = "No-proxy list for Docker builds (optional)"
  type        = string
  default     = ""
}

computed "build_args" {
  description = "Non-empty Docker build arguments"
  expression  = compact([
    var.build_arg_proxy != "" ? "--build-arg HTTP_PROXY=${var.build_arg_proxy}" : "",
    var.build_arg_no_proxy != "" ? "--build-arg NO_PROXY=${var.build_arg_no_proxy}" : "",
  ])
}

task "build" {
  description = "Build the Docker image with optional proxy settings"
  commands    = ["docker build ${join(" ", computed.build_args)} ."]
}