compareFiles.cpp

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/*****************************************************************************
    NumeRe: Framework fuer Numerische Rechnungen
    Copyright (C) 2022  Erik Haenel et al.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
 
#include "compareFiles.hpp"
#include "dtl/dtl.hpp"
#include <fstream>
#include <sstream>
 
static std::vector<std::string> getFileContent(const std::string& file)
{
    std::vector<std::string> content;
    std::ifstream fileStream(file, std::ios_base::in | std::ios_base::binary);
 
    while (fileStream.good() && !fileStream.eof())
    {
        std::string sLine;
        std::getline(fileStream, sLine);
        content.push_back(sLine);
    }
 
    return content;
}
 
 
std::string compareFiles(const std::string& file1, const std::string& file2)
{
    std::vector<std::string> content1 = getFileContent(file1);
    std::vector<std::string> content2 = getFileContent(file2);
 
    // Calculate the differences between both files
    dtl::Diff<std::string> diffFile(content1, content2);
    diffFile.compose();
 
    // Convert the differences into unified form
    diffFile.composeUnifiedHunks();
 
    // Print the differences to a string stream
    std::ostringstream uniDiff;
 
    // Get revision identifier
    uniDiff << "--- " << file1 << "\n+++ " << file2 << "\n";
 
    diffFile.printUnifiedFormat(uniDiff);
 
    // Return the contents of the stream
    return uniDiff.str();
}