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

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

#include "cmGccDepfileReader.h"

#include <utility>

#include <vector>

#include <cm/optional>

#include "cmGccDepfileLexerHelper.h"

#include "cmStringAlgorithms.h"

#include "cmSystemTools.h"

cm::optional<cmGccDepfileContent> cmReadGccDepfile(

  char const* filePath, std::string const& prefix,

  GccDepfilePrependPaths prependPaths)

{

  cmGccDepfileLexerHelper helper;

  if (!helper.readFile(filePath)) {

    return cm::nullopt;

  }

  auto deps = cm::make_optional(std::move(helper).extractContent());

  for (auto& dep : *deps) {

    for (auto& rule : dep.rules) {

      if (prependPaths == GccDepfilePrependPaths::All && !prefix.empty() &&

          !cmSystemTools::FileIsFullPath(rule)) {

        rule = cmStrCat(prefix, '/', std::move(rule));

      }

      if (cmSystemTools::FileIsFullPath(rule)) {

        rule = cmSystemTools::CollapseFullPath(rule);

      }

      cmSystemTools::ConvertToLongPath(rule);

    }

    for (auto& path : dep.paths) {

      if (!prefix.empty() && !cmSystemTools::FileIsFullPath(path)) {

        path = cmStrCat(prefix, '/', std::move(path));

      }

      if (cmSystemTools::FileIsFullPath(path)) {

        path = cmSystemTools::CollapseFullPath(path);

      }

      cmSystemTools::ConvertToLongPath(path);

    }

  }

  return deps;

}