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#include <tclap/CmdLine.h>
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <iterator>
#include <string>
class TmpFile {
public:
TmpFile() : name_(std::tmpnam(NULL)), stream_() {}
~TmpFile() {
if (stream_.is_open()) {
stream_.close();
std::remove(name_.c_str());
}
}
const std::string &name() const { return name_; }
std::ifstream &stream() {
if (!stream_.is_open()) {
stream_.open(name_, std::ifstream::binary | std::ifstream::ate);
}
return stream_;
}
private:
std::string name_;
std::ifstream stream_;
};
/**
* \brief Runs a command with given parameters and compares its output to
* stdout with the contents of a given reference file.
* \details A temporary file will be used to catch the stdout/stderr output of
* the command.
* \return The program returns code 0 if both files compare equal, or a nonzero
* value indicating the type of error.
*/
int main(int argc, char *argv[]) {
try {
TCLAP::CmdLine argParser("Runs a command with given parameters and"
" compares its output to stdout with the "
" contents of a given reference file.",
' ', "1.0");
TCLAP::UnlabeledValueArg<std::string> refFile("ref", "Reference file", true,
"", "string", argParser);
TCLAP::UnlabeledValueArg<std::string> baseCmd("cmd", "Command to run", true,
"", "string", argParser);
TCLAP::UnlabeledValueArg<std::string> params("params", "Parameters", false,
"", "string", argParser);
argParser.parse(argc, argv);
/* Execute command and capture stdout/stderr. */
std::string cmd = baseCmd.getValue();
if (params.isSet()) {
cmd += " " + params.getValue();
}
TmpFile tmpFile;
cmd += " > " + tmpFile.name() + " 2>&1";
int unused = std::system(cmd.c_str());
/* Compare against contents of reference file. */
std::ifstream &f_tmp = tmpFile.stream();
std::ifstream f_ref(refFile.getValue(),
std::ifstream::binary | std::ifstream::ate);
if (f_tmp.fail() || f_ref.fail()) {
return 2; // One of the files fail.
}
if (f_tmp.tellg() != f_ref.tellg()) {
return 3; // Files have different sizes.
}
f_tmp.seekg(0, std::ifstream::beg);
f_ref.seekg(0, std::ifstream::beg);
bool bEqual = std::equal(std::istreambuf_iterator<char>(f_tmp.rdbuf()),
std::istreambuf_iterator<char>(),
std::istreambuf_iterator<char>(f_ref.rdbuf()));
return bEqual ? 0 : 4; // 4 = Files to not compare equal.
} catch (TCLAP::ArgException &e) {
std::cerr << e.what() << std::endl;
}
return -1;
}
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