private static async Task <int> Preview(PreviewVerb verb)
{
Logger.Info("Running command: preview (showing only preview of migrations to be applied)");
DatabaseMigrator migrator = new DatabaseMigrator(verb);
await migrator.PreviewAsync(verb);
return(0);
}
public async Task PreviewAsync(PreviewVerb verb)
{
await InitializeAsync();
var appliedMigrations = await executor.PreviewAsync();
if (appliedMigrations.Count == 0)
{
Logger.Info("There are no pending migrations to be applied.");
}
else
{
string GetMigrationLines(PendingModuleMigration moduleMigration)
{
return(string.Join('\n',
moduleMigration.Migrations.Select((x, i) =>
$" {i + 1}. {x.ToString(false)}{(x.ModuleName != moduleMigration.Specifier.ModuleName ? " (dependency)" : "")}")));
}
var moduleInfos = appliedMigrations.Select(x => $"{x.Specifier.ModuleName}{(x.Migrations.Any(y => y.Version != null) ? $" to version {x.Migrations.OrderByDescending(y => y.Version).First().Version}" : "")} ({x.Migrations.Count()} migration(s)):\n{GetMigrationLines(x)}");
string moduleInfosLines = string.Join("\n\n", moduleInfos);
Logger.Info($"There are {appliedMigrations.Count} modules to be migrated:\n\n{moduleInfosLines}");
}
}