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ecto lib mix tasks ecto.gen.migration.ex
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lib/mix/tasks/ecto.gen.migration.ex

defmodule Mix.Tasks.Ecto.Gen.Migration do
use Mix.Task
import Macro, only: [camelize: 1, underscore: 1]
import Mix.Generator
import Mix.Ecto
@shortdoc "Generates a new migration for the repo"
@moduledoc """
Generates a migration.
The repository must be set under `:ecto_repos` in the
current app configuration or given via the `-r` option.
## 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 to be any subdirectory of `priv` by
specifying 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
"""
@switches [change: :string]
@doc false
def run(args) do
no_umbrella!("ecto.gen.migration")
repos = parse_repo(args)
Enum.each repos, fn repo ->
case OptionParser.parse(args, switches: @switches) do
{opts, [name], _} ->
ensure_repo(repo, args)
path = Path.relative_to(migrations_path(repo), Mix.Project.app_path)
file = Path.join(path, "#{timestamp()}_#{underscore(name)}.exs")
create_directory path
assigns = [mod: Module.concat([repo, Migrations, camelize(name)]),
change: opts[:change]]
create_file file, migration_template(assigns)
if open?(file) and 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
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
<%= @change %>
end
end
"""
end