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Liquibase CLI interface

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package liquibase.integration.commandline;

import liquibase.Scope;
import liquibase.command.CommandResults;
import liquibase.command.CommandScope;
import liquibase.command.CommonArgumentNames;
import liquibase.exception.CommandValidationException;
import liquibase.exception.MissingRequiredArgumentException;
import liquibase.io.OutputFileHandler;
import liquibase.io.OutputFileHandlerFactory;
import liquibase.util.StringUtil;
import picocli.CommandLine;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.stream.Collectors;
import java.util.stream.Stream;

class CommandRunner implements Callable {

    private CommandLine.Model.CommandSpec spec;

    @Override
    public CommandResults call() throws Exception {
        List command = new ArrayList<>();
        command.add(spec.commandLine().getCommandName());

        CommandLine parentCommand = spec.commandLine().getParent();
        while (!parentCommand.getCommandName().equals("liquibase")) {
            command.add(0, parentCommand.getCommandName());
            parentCommand = parentCommand.getParent();
        }

        final String[] commandName = LiquibaseCommandLine.getCommandNames(spec.commandLine());
        for (int i=0; i initProjectArguments = Stream.of(CommonArgumentNames.CHANGELOG_FILE, CommonArgumentNames.URL, CommonArgumentNames.USERNAME, CommonArgumentNames.PASSWORD).map(CommonArgumentNames::getArgumentName).collect(Collectors.toSet());
                throw new CommandValidationException(cve.getMessage() + (initProjectArguments.contains(((MissingRequiredArgumentException) cause).getArgumentName()) ? ". If you need to configure new liquibase project files and arguments, run the 'liquibase init project' command." : ""));
            } else {
                throw cve;
            }
        } finally {
            outputFileHandler.close();
        }
    }

    public void setSpec(CommandLine.Model.CommandSpec spec) {
        this.spec = spec;
    }
}