/
ecto.gen.migration.ex
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ecto.gen.migration.ex
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defmodule Mix.Tasks.Ecto.Gen.Migration do
use Mix.Task
import Mix.Ecto
import Mix.Generator
import Mix.Utils, only: [camelize: 1]
@shortdoc "Generate a new migration for the repo"
@moduledoc """
Generates a migration.
## Examples
mix ecto.gen.migration add_posts_table
mix ecto.gen.migration add_posts_table -r Custom.Repo
By default, the migration will be generated to the
"priv/YOUR_REPO/migrations" directory of the current application
but it can be configured by specify the `:priv` key under
the repository configuration.
This generator will automatically open the generated file if
you have `ECTO_EDITOR` set in your environment variable.
## Command line options
* `-r`, `--repo` - the repo to generate migration for (defaults to `YourApp.Repo`)
* `--no-start` - do not start applications
"""
@doc false
def run(args) do
no_umbrella!("ecto.gen.migration")
Mix.Task.run "app.start", args
repo = parse_repo(args)
case OptionParser.parse(args) do
{_, [name], _} ->
ensure_repo(repo)
path = Path.relative_to(migrations_path(repo), Mix.Project.app_path)
file = Path.join(path, "#{timestamp}_#{name}.exs")
create_directory path
create_file file, migration_template(mod: Module.concat([repo, Migrations, camelize(name)]))
if open?(file) && Mix.shell.yes?("Do you want to run this migration?") do
Mix.Task.run "ecto.migrate", [repo]
end
{_, _, _} ->
Mix.raise "expected ecto.gen.migration to receive the migration file name, " <>
"got: #{inspect Enum.join(args, " ")}"
end
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)
embed_template :migration, """
defmodule <%= inspect @mod %> do
use Ecto.Migration
def change do
end
end
"""
end