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

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

#include "cmRemoveCommand.h"

#include "cmExecutionStatus.h"

#include "cmList.h"

#include "cmMakefile.h"

#include "cmValue.h"

// cmRemoveCommand

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

                     cmExecutionStatus& status)

{

  if (args.empty()) {

    return true;

  }

  std::string const& variable = args[0]; // VAR is always first

  // get the old value

  cmValue cacheValue = status.GetMakefile().GetDefinition(variable);

  // if there is no old value then return

  if (!cacheValue) {

    return true;

  }

  // expand the variable

  cmList const varArgsExpanded{ *cacheValue };

  // expand the args

  // check for REMOVE(VAR v1 v2 ... vn)

  cmList const argsExpanded{ args.begin() + 1, args.end() };

  // now create the new value

  std::string value;

  for (std::string const& varArgExpanded : varArgsExpanded) {

    int found = 0;

    for (std::string const& argExpanded : argsExpanded) {

      if (varArgExpanded == argExpanded) {

        found = 1;

        break;

      }

    }

    if (!found) {

      if (!value.empty()) {

        value += ";";

      }

      value += varArgExpanded;

    }

  }

  // add the definition

  status.GetMakefile().AddDefinition(variable, value);

  return true;

}