CMake/Source/cmGccDepfileReader.cxx

/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#include "cmGccDepfileReader.h"

#include <type_traits>
#include <utility>
#include <vector>

#include <cm/optional>

#include "cmGccDepfileLexerHelper.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"

cm::optional<cmGccDepfileContent> cmReadGccDepfile(const char* filePath)
{
  cmGccDepfileLexerHelper helper;
  if (helper.readFile(filePath)) {
    return cm::make_optional(std::move(helper).extractContent());
  }
  return cm::nullopt;
}

cm::optional<cmGccDepfileContent> cmReadGccDepfile(const char* filePath,
                                                   const std::string& prefix)
{
  auto deps = cmReadGccDepfile(filePath);

  if (prefix.empty() || !deps) {
    return deps;
  }

  for (auto& dep : *deps) {
    for (auto& rule : dep.rules) {
      if (!cmSystemTools::FileIsFullPath(rule)) {
        rule = cmStrCat(prefix, rule);
      }
      if (cmSystemTools::FileIsFullPath(rule)) {
        rule = cmSystemTools::CollapseFullPath(rule);
      }
    }
    for (auto& path : dep.paths) {
      if (!cmSystemTools::FileIsFullPath(path)) {
        path = cmStrCat(prefix, path);
      }
      if (cmSystemTools::FileIsFullPath(path)) {
        path = cmSystemTools::CollapseFullPath(path);
      }
    }
  }

  return deps;
}