/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#include "cmEnableLanguageCommand.h"

#include "cmDiagnostics.h"

#include "cmExecutionStatus.h"

#include "cmMakefile.h"

#include "cmMessageType.h"

#include "cmPolicies.h"

#include "cmSystemTools.h"

bool cmEnableLanguageCommand(std::vector<std::string> const& args,

                             cmExecutionStatus& status)

{

  if (args.empty()) {

    status.SetError("called with incorrect number of arguments");

    return false;

  }

  cmMakefile& mf = status.GetMakefile();

  if (!mf.IsNormalDefinitionSet("PROJECT_NAME")) {

    switch (mf.GetPolicyStatus(cmPolicies::CMP0165)) {

      case cmPolicies::WARN:

        mf.IssueDiagnostic(

          cmDiagnostics::CMD_AUTHOR,

          "project() should be called prior to this enable_language() call.");

        break;

      case cmPolicies::OLD:

        break;

      case cmPolicies::NEW:

        mf.IssueMessage(

          MessageType::FATAL_ERROR,

          "project() must be called prior to this enable_language() call.");

        cmSystemTools::SetFatalErrorOccurred();

        return false;

      default:

        break;

    }

  }

  bool optional = false;

  std::vector<std::string> languages;

  for (std::string const& it : args) {

    if (it == "OPTIONAL") {

      optional = true;

    } else {

      languages.push_back(it);

    }

  }

  mf.EnableLanguage(languages, optional);

  return true;

}