loadable_libraries.cc

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#include "cetlib/loadable_libraries.h"
#include "cetlib/LibraryManager.h"

#include <iostream>
#include <regex>
#include <utility>
#include <vector>

namespace {
  std::string const regex_prefix{"([-A-Za-z0-9]*_)*"};
  std::regex const slash{"/"};

  std::string
  pattern(std::string const& spec)
  {
    std::string const canonSpec = std::regex_replace(spec, slash, "_");
    return regex_prefix + canonSpec + "_";
  }

  inline std::vector<std::string>
  getLibraries(cet::LibraryManager const& lm)
  {
    std::vector<std::string> result;
    lm.getLoadableLibraries(result);
    return result;
  }
}

void
cet::loadable_libraries(std::ostream& os,
                        std::string const& spec,
                        std::string const& suffix)
{
  cet::LibraryManager const lm{suffix, pattern(spec + ".*")};
  auto const& libs = getLibraries(lm);

  std::string str{};
  for (auto const& lib : libs) {
    auto const& libspecs = lm.getSpecsByPath(lib);
    if (libspecs.first.find(spec) == 0) {
      str += libspecs.first;
      str += '\n';
    }
    // Not all libraries have a long spec.
    if (!libspecs.second.empty() && libspecs.second.find(spec) == 0) {
      str += libspecs.second;
      str += '\n';
    }
  }
  os << str;
}