copy, C++ (vc++) - rextester

copy

#include <iostream>
#include <string>
#include <vector>
#include <experimental/filesystem>
#include <regex>
#include <type_traits>

namespace fs = std::experimental::filesystem ;

// list of paths of all files under the directory 'dir' when the extenstion matches the regex
// file_list<true> searches recursively into sub-directories; file_list<false> searches only the specified directory
template < bool RECURSIVE > std::vector<fs::path> file_list( fs::path dir, std::regex ext_pattern )
{
    std::vector<fs::path> result ;

using iterator = std::conditional< RECURSIVE, 
                                       fs::recursive_directory_iterator, fs::directory_iterator >::type ;

const iterator end ;
    for( iterator iter { dir } ; iter != end ; ++iter )
    {
        const std::string extension = iter->path().extension().string() ;
        if( fs::is_regular_file(*iter) && std::regex_match( extension, ext_pattern ) ) result.push_back( *iter ) ;
    }
    
    return result ;
}

// literal '.' followed by one of "cpp", "cc", "cxx", "h", "hh", "hpp" or "hxx"
// note: ?: indicates that it is a non-capturing group
static const std::regex cpp_files( "\\.(?:cpp|cc|cxx|h|hh|hpp|hxx)" ) ;

// non-recursive scan for c++ files: if dir is omitted, current directory is scanned 
std::vector<fs::path> scan_cpp_files( fs::path dir = "." ) { return file_list<false>( dir, cpp_files ) ; }

// recursive scan for c++ files: if dir is omitted, current directory is scanned 
std::vector<fs::path> rscan_cpp_files( fs::path dir = "." ) { return file_list<true>( dir, cpp_files ) ; }

int main()
{
    const fs::path win_dir = "C:/Windows/" ; // adjust as required
    
    // print files with extension ".log" or ".ini" in the directory win_dir (non-recursive)
    for( const auto& file_path : file_list<false>( win_dir, std::regex( "\\.(?:log|ini)" ) ) )
         std::cout << file_path << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;

// print files with extension ".log" in the directory "C:/Windows/Logs" (recursive)
    for( const auto& file_path : file_list<true>( win_dir/"Logs", std::regex( "\\.(?:log|ini)" ) ) )
        std::cout << file_path << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;

// print all c++ files the current directory (non-recursive)
    for( const auto& file_path : scan_cpp_files() )
        std::cout << file_path << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;

const fs::path vc_crt_src = "C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/crt/src" ;
    // print all c++ files in the directory vc_crt_src (recursive)
    for( const auto& file_path : rscan_cpp_files(vc_crt_src) )
        std::cout << file_path.parent_path().stem() / file_path.filename() << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;
}


run \| edit \| history \| help	0