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  1. //GREP.CPP
  2. //COPYRIGHT EMILE J. KEITH 2014//
  3. #include <iostream>
  4. #include <string>
  5. #include <boost/filesystem.hpp>//boost a collection of C++ open source libraries that are cross-platform compatible
  6. #include <regex>
  7. #include <boost/regex.hpp>//Has more features than the standard library regex
  8. #include <fstream>
  9. #include <exception>
  10. #include <stdlib.h>
  11. #include <iomanip>
  12. using namespace std;
  13. using namespace std::regex_constants;
  14. using namespace boost::filesystem;
  15. int main(int argc, char *argv[])
  16. {
  17.  
  18. 	if(argc<3)//Since the program name is the first function and there has to be an expression and another search parameter, there must be atlest 3 arguments on call
  19. 	{
  20. 		cout<<"No search area was provided!\n"<<endl;
  21. 		return 0;
  22. 	}
  23. 	else
  24. 	{
  25. 		bool iterateAllWithExtension=false;
  26. 		string searchPath,destination, extension;
  27. 		const string lastArgument(argv[argc-1]);
  28. 		if(lastArgument[lastArgument.find_last_of("/\\")+1]=='*' && lastArgument.find_last_of("/\\")+2==lastArgument.find_last_of("."))//If the char at the position after the last '\' or '/' in the provided path is a '*', and the following char is the last '.', signifying the start of the extension
  29. 		{
  30. 			searchPath=lastArgument.substr(0,lastArgument.find_last_of("/\\"));
  31. 			destination=lastArgument.substr(lastArgument.find_last_of("/\\")+1,string::npos);
  32. 			extension=destination.substr(destination.find_last_of('.'), string::npos);
  33. 			iterateAllWithExtension=true;
  34. 		} 
  35. 		if(iterateAllWithExtension)
  36. 		{
  37. 			path p(searchPath);//path class belonging to the boost library
  38. 			if(exists(p))
  39. 			{
  40. 			}
  41. 			else
  42. 			{
  43. 				cout<<"The file or directory provided does not exist\n";
  44. 				return 0;
  45. 			}
  46. 		}
  47. 		path p(argv[argc-1]);//This p is has a different scope than the previous, and it can be used as a name since the previous one is already out of scope
  48. 		if(exists(p) || exists(searchPath))//This needs to be fixed, because a .*.txt cannot exist
  49. 		{
  50. 			string fileName=p.filename().string();
  51. 			if(fileName.find(".")==0)//If the filename they provided begins with a fullstop, which you cannot do due to file naming restricitons, then you are trying to look for all files with a certain extension
  52. 			{
  53. 			}
  54. 			cout<<"Exists\n\n";
  55. 			if(is_regular_file(p))//function from the boost filesystem library
  56. 			{
  57. 				unsigned long endOfFile, currentPosition;
  58. 				ifstream file(argc[argv-1]);
  59. 				try
  60. 				{
  61. 					if(file.bad())
  62. 					{
  63. 						throw runtime_error("File is corrupted and cannot be opened for reading, program will now terminate\n");
  64. 					}
  65. 					else
  66. 					{
  67. 						file.seekg(0,ios::end);
  68. 						endOfFile=file.tellg();
  69. 						file.seekg(0,ios::beg);
  70. 					}
  71. 				}
  72. 				catch(runtime_error ex)//catches the runtime_error object thrown earlier
  73. 				{
  74. 					cerr<<ex.what()<<endl;
  75. 					exit(EXIT_FAILURE);//EXIT_FAILURE indicates that main must return 1 in windows, and whatever error terminating value in another operating system
  76. 				}
  77. 				//string sExpression(argv[argc-2]);
  78. 				const string toMatch=argv[argc-2];
  79. 				regex expression(toMatch);//the expression will be the second to last argument passed to main
  80. 				smatch match;//smatch is a typedef of match_results
  81. 				string currentLine;
  82. 				cout<<"In file "<<p.filename()<<" : \n";
  83. 				cout<<"__________________________________________"<<endl;
  84. 				unsigned short lineNumber=1;
  85. 				while(getline(file, currentLine))
  86. 				{
  87. 					currentPosition=file.tellg();
  88. 					if(currentPosition==endOfFile)
  89. 					{
  90. 						lineNumber=1;
  91. 						break;
  92. 					}
  93. 					else
  94. 					{
  95. 						if(regex_search(currentLine,expression))
  96. 							cout<<lineNumber<<"."<<currentLine<<"\n";
  97. 					}
  98. 					lineNumber++;
  99. 				}
  100. 			}
  101. 			else if(is_directory(p))
  102. 			{	
  103. 				cout<<"It is a directory"<<endl;
  104. 				return 0;
  105. 			}
  106. 		}
  107. 		else
  108. 		{
  109. 			cout<<"The file or directory provided does not exist\n";
  110. 			return 0;
  111. 		}
  112. 	}
  113. 	/*typedef bool bl;//Just playing with typedef
  114. 	bl tom=(bl)(string(argv[1])=="emile");
  115. 	cout<<argv[1]<<"\t"<<tom<<endl;
  116. 	if(tom)
  117. 		std::cout<<"I knew it was you"<<endl;
  118. 	else
  119. 		std::cout<<"why"<<endl;
  120. 	if(argc>2)
  121. 	{
  122. 		if(string(argv[2])=="-I")
  123. 		cout<<"It works"<<endl;
  124. 	}*/
  125. 	return 0;
  126. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:5:116: fatal error: boost/filesystem.hpp: No such file or directory
 #include <boost/filesystem.hpp>//boost a collection of C++ open source libraries that are cross-platform compatible
                                                                                                                    ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/taP2U3
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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