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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmFilePathChecksum_h
#define cmFilePathChecksum_h
#include <cmConfigure.h> // IWYU pragma: keep
#include <stddef.h>
#include <string>
#include <utility>
class cmMakefile;
/** \class cmFilePathChecksum
* @brief Generates a checksum for the parent directory of a file
*
* The checksum is calculated from the relative file path to the
* closest known project directory. This guarantees reproducibility
* when source and build directory differ e.g. for different project
* build directories.
*/
class cmFilePathChecksum
{
public:
/// Maximum number of characters to use from the path checksum
static const size_t partLengthDefault = 10;
/// @brief Parent directories are empty
cmFilePathChecksum();
/// @brief Initilizes the parent directories manually
cmFilePathChecksum(const std::string& currentSrcDir,
const std::string& currentBinDir,
const std::string& projectSrcDir,
const std::string& projectBinDir);
/// @brief Initilizes the parent directories from a makefile
cmFilePathChecksum(cmMakefile* makefile);
/// @brief Allows parent directories setup after construction
///
void setupParentDirs(const std::string& currentSrcDir,
const std::string& currentBinDir,
const std::string& projectSrcDir,
const std::string& projectBinDir);
/* @brief Calculates the path checksum for the parent directory of a file
*
*/
std::string get(const std::string& filePath);
/* @brief Same as get() but returns only the first length characters
*
*/
std::string getPart(const std::string& filePath,
size_t length = partLengthDefault);
private:
/// Size of the parent directory list
static const size_t numParentDirs = 4;
/// List of (directory name, seed name) pairs
std::pair<std::string, std::string> parentDirs[numParentDirs];
};
#endif
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