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module Plugin
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class MigrationGenerator < Rails::Generators::Base
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class_option :plugin_name, :required => true
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class_option :plugin_source
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attr_accessor :migration_pattern
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hook_for :orm, :required => true do |instance, klass|
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new_migration = instance.invoke klass, nil, nil, destination_root: instance.send(:plugin_source)
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# the task return a suggested new migration name. If the migration already
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# exists, the file with older timestamp would remain. In this case we
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# should search for the older file with the same name part.
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instance.migration_pattern = instance.send(:extract_migration_name, new_migration.first)
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end
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def initialize(*args)
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super
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self.destination_root = plugin_source
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end
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def copy_latest_migration
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destination_file = File.join(
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destination_root,
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'db/migrate',
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destination_file_name
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)
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unless options['pretend']
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if migration_file
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# There is no rename task for some reason...
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copy_file migration_file, destination_file
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remove_file File.join('db/migrate', migration_file)
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else
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say_status(
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:error,
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_('Could not find %{migration_name} migration in %{destination}') % {
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:migration_name => migration_pattern,
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:destination => destination_root
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},
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:red
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)
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end
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end
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[destination_file]
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end
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private
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def extract_migration_name(migration_file_name)
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File.basename(migration_file_name).sub(/^\d*_/, '').sub(/\.rb$/, '')
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end
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# used by copy_file task to indicate where the sources are
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def source_paths
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[File.join(plugin_source, 'db/migrate')]
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end
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def destination_file_name
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File.basename(migration_file, File.extname(migration_file)) +
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".#{plugin_name}" +
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File.extname(migration_file)
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end
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def migration_file
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@migration_file ||= begin
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full_name = Dir.glob(File.join(plugin_source, 'db/migrate/*.rb')).grep(/\d+_#{migration_pattern}.rb$/).first
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File.basename(full_name) if full_name
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end
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end
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def plugin_source
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# assuming a default folder layout for developer setup.
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@plugin_source ||= options[:plugin_source] || File.join(destination_root, "../#{plugin_name}/")
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end
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def plugin_name
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@plugin_name ||= options[:plugin_name].underscore
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end
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end
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end
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