erlembic

-module(erlembic).

%% API exports
-export([main/1]).

%%====================================================================
%% API functions
%%====================================================================

%% escript Entry point
main(Args) ->
    argparse:run(Args, cli(), #{progname => erlembic}),
    erlang:halt(0).

%%====================================================================
%% Internal functions
%%====================================================================

%% Command Specification
cli() ->
    #{
        commands => #{
            "init" => #{
                arguments => [
                    #{
                        name => directory,
                        type => string,
                        help => "Name of target directory to set the environment.",
                        default => "erlembic"
                    }
                ],
                help => "Initialize erlembic environment.",
                handler =>
                    fun(#{directory := Directory}) ->
                        erlembic_init:run(Directory)
                    end
            },
            "revision" => #{
                arguments => [
                    #{
                        name => name,
                        type => string,
                        help => "Name of the SQL file for new migration script"
                    }
                ],
                help => "Create a new revision file.",
                handler =>
                    fun(#{name := Name}) ->
                        erlembic_revision:run(Name)
                    end
            },
            "upgrade" => #{
                arguments => [
                    #{
                        name => revision,
                        type => integer,
                        help => "Number of the migration script",
                        default => "HEAD"
                    }
                ],
                help => "Upgrade to a later version.",
                handler =>
                    fun(#{revision := Revision}) ->
                        erlembic_upgrade:run(Revision)
                    end
            },
            "downgrade" => #{
                arguments => [
                    #{
                        name => revision,
                        type => integer,
                        help => "Number of the migration script",
                        default => 0
                    }
                ],
                help => "Revert to a previous version.",
                handler =>
                    fun(#{revision := Revision}) ->
                        erlembic_downgrade:run(Revision)
                    end
            }
        }
    }.