defmodule Mix.Tasks.Guardian.Db.Gen.Migration do
@shortdoc "Generates Guardian.DB's migration"
@moduledoc """
Generates the required GuardianDb's database migration.
It allows custom schema name, using the config
entry `schema_name`.
"""
use Mix.Task
import Mix.Ecto
import Mix.Generator
@doc false
def run(args) do
no_umbrella!("ecto.gen.migration")
repos = parse_repo(args)
Enum.each(repos, fn repo ->
ensure_repo(repo, args)
path = Ecto.Migrator.migrations_path(repo)
source_path =
:guardian_db
|> Application.app_dir()
|> Path.join("priv/templates/migration.exs.eex")
config = Application.fetch_env!(:guardian, Guardian.DB)
schema_name =
config
|> Keyword.get(:schema_name, "guardian_tokens")
|> String.to_atom()
prefix = Keyword.get(config, :prefix, nil)
generated_file =
EEx.eval_file(source_path,
module_prefix: app_module(),
schema_name: schema_name,
db_prefix: prefix
)
target_file = Path.join(path, "#{timestamp()}_guardiandb.exs")
create_directory(path)
create_file(target_file, generated_file)
end)
end
defp app_module do
Mix.Project.config()
|> Keyword.fetch!(:app)
|> to_string()
|> Macro.camelize()
end
defp timestamp do
{{y, m, d}, {hh, mm, ss}} = :calendar.universal_time()
"#{y}#{pad(m)}#{pad(d)}#{pad(hh)}#{pad(mm)}#{pad(ss)}"
end
defp pad(i) when i < 10, do: <<?0, ?0 + i>>
defp pad(i), do: to_string(i)
end