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