Validators.hpp
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#pragma once
// Distributed under the LGPL v2.1 license. See accompanying
// file LICENSE or https://github.com/CLIUtils/CLI11 for details.
#include <string>
#include <iostream>
#include <functional>
#include "CLI/TypeTools.hpp"
// C standard library
// Only needed for existence checking
// Could be swapped for filesystem in C++17
#include <sys/types.h>
#include <sys/stat.h>
namespace CLI {
/// @defgroup validator_group Validators
/// @brief Some validators that are provided
///
/// These are simple `bool(std::string)` validators that are useful.
/// @{
/// Check for an existing file
inline bool ExistingFile(std::string filename) {
struct stat buffer;
bool exist = stat(filename.c_str(), &buffer) == 0;
bool is_dir = (buffer.st_mode & S_IFDIR) != 0;
if(!exist) {
std::cerr << "File does not exist: " << filename << std::endl;
return false;
} else if (is_dir) {
std::cerr << "File is actually a directory: " << filename << std::endl;
return false;
} else {
return true;
}
}
/// Check for an existing directory
inline bool ExistingDirectory(std::string filename) {
struct stat buffer;
bool exist = stat(filename.c_str(), &buffer) == 0;
bool is_dir = (buffer.st_mode & S_IFDIR) != 0;
if(!exist) {
std::cerr << "Directory does not exist: " << filename << std::endl;
return false;
} else if (is_dir) {
return true;
} else {
std::cerr << "Directory is actually a file: " << filename << std::endl;
return false;
}
}
/// Check for a non-existing path
inline bool NonexistentPath(std::string filename) {
struct stat buffer;
bool exist = stat(filename.c_str(), &buffer) == 0;
if(!exist) {
return true;
} else {
std::cerr << "Path exists: " << filename << std::endl;
return false;
}
}
/// Produce a range validator function
template<typename T>
std::function<bool(std::string)> Range(T min, T max) {
return [min, max](std::string input){
T val;
detail::lexical_cast(input, val);
return val >= min && val <= max;
};
}
/// Range of one value is 0 to value
template<typename T>
std::function<bool(std::string)> Range(T max) {
return Range((T) 0, max);
}
/// @}
} // namespace CLI