src/gromacs/utility/path.h

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  36 /*! \libinternal \file
  37  * \brief
  38  * Declares functions for OS-independent path handling.
  39  *
  40  * \author Teemu Murtola <teemu.murtola@gmail.com>
  41  * \inlibraryapi
  42  * \ingroup module_utility
  43  */
  44 #ifndef GMX_UTILITY_PATH_H
  45 #define GMX_UTILITY_PATH_H
  46
  47 #include <string>
  48 #include <string_view>
  49 #include <utility>
  50 #include <vector>
  51
  52 namespace gmx
  53 {
  54
  55 class Path
  56 {
  57 public:
  58     static bool containsDirectory(const std::string& path);
  59     static bool isAbsolute(const char* path);
  60     static bool isAbsolute(const std::string& path);
  61     static bool isEquivalent(const std::string& path1, const std::string& path2);
  62
  63     static std::string join(const std::string& path1, const std::string& path2);
  64     static std::string join(const std::string& path1, const std::string& path2, const std::string& path3);
  65     //! Return a path using directory separators that suit the execution OS.
  66     static std::string normalize(const std::string& path);
  67     /*! \brief Returns a copy of the parent path (ie. directory
  68      * components) of \c input ie. up to but excluding the last
  69      * directory separator (if one exists).
  70      *
  71      * \returns A copy of the parent path-components, or empty if
  72      * no directory separator exists. */
  73     static std::string getParentPath(const std::string& input);
  74     /*! \brief Returns a copy of the filename in \c input
  75      * ie. after the last directory separator (if one exists). */
  76     static std::string getFilename(const std::string& input);
  77     //! Returns whether an extension is present in \c input.
  78     static bool hasExtension(const std::string& input);
  79     /*! \brief Returns whether the extension present in \c input
  80      * matches \c extension (which does not include the separator
  81      * character). */
  82     static bool extensionMatches(std::string_view input, std::string_view extension);
  83     /*! \brief Returns a copy of the input without any trailing
  84      * extension found in the filename component. */
  85     static std::string stripExtension(const std::string& input);
  86     /*! \brief Concatenate \c stringToAdd to a copy of \c input,
  87      * before any file extension (if one exists), and return the
  88      * result. */
  89     static std::string concatenateBeforeExtension(const std::string& input, const std::string& stringToAdd);
  90
  91     static const char* stripSourcePrefix(const char* path);
  92
  93     static bool        exists(const char* path);
  94     static bool        exists(const std::string& path);
  95     static std::string getWorkingDirectory();
  96
  97     static void splitPathEnvironment(const std::string& pathEnv, std::vector<std::string>* result);
  98     static std::vector<std::string> getExecutablePaths();
  99
 100     static std::string resolveSymlinks(const std::string& path);
 101
 102 private:
 103     // Disallow instantiation.
 104     Path();
 105 };
 106
 107 class File
 108 {
 109 public:
 110     struct NotFoundInfo
 111     {
 112         NotFoundInfo(const char* filename, const char* message, const char* call, bool wasError, int err) :
 113             filename(filename),
 114             message(message),
 115             call(call),
 116             wasError(wasError),
 117             err(err)
 118         {
 119         }
 120
 121         const char* filename;
 122         const char* message;
 123         const char* call;
 124         bool        wasError;
 125         int         err;
 126     };
 127
 128     static void              returnFalseOnError(const NotFoundInfo& info);
 129     static void              throwOnError(const NotFoundInfo& info);
 130     [[noreturn]] static void throwOnNotFound(const NotFoundInfo& info);
 131
 132     typedef void (*NotFoundHandler)(const NotFoundInfo& info);
 133
 134     /*! \brief
 135      * Checks whether a file exists and is a regular file.
 136      *
 137      * \param[in] filename    Path to the file to check.
 138      * \param[in] onNotFound  Function to call when the file does not
 139      *     exists or there is an error accessing it.
 140      * \returns   `true` if \p filename exists and is accessible.
 141      *
 142      * Does not throw, unless onNotFound throws.
 143      */
 144     static bool exists(const char* filename, NotFoundHandler onNotFound);
 145     //! \copydoc exists(const char *, NotFoundHandler)
 146     static bool exists(const std::string& filename, NotFoundHandler onNotFound);
 147
 148 private:
 149     // Disallow instantiation.
 150     File();
 151 };
 152
 153 class Directory
 154 {
 155 public:
 156     static int  create(const char* path);
 157     static int  create(const std::string& path);
 158     static bool exists(const char* path);
 159     static bool exists(const std::string& path);
 160
 161 private:
 162     // Disallow instantiation.
 163     Directory();
 164 };
 165
 166 } // namespace gmx
 167
 168 #endif