Command line parser checks if file path directories exist

Will present an error if they do not exist. This means no time is wasted generating the lattice just for it to not be able to be saved

LatticeDehomogenization/src/ErrorCodes.h

@@ -7,15 +7,17 @@
 
 enum ErrorCodes {
 	NoError = 0,
-	FileNotFound,
-	CellSizeNotDefined,
-	StrutRadiusNotDefined,
-	CantDetermineLatticeType,
-	LatticeTypeNotDefined,
+	FileNotFound, DirectoryNotFound, InvalidExtension,
+	CellSizeNotDefined, StrutRadiusNotDefined,
+
+	CantDetermineLatticeType, LatticeTypeNotDefined,
+
 	InvalidArgument,
 
 	FailedToMergeCells, FailedToTrimLattice,
 	LatticeIsNull, BoundingBoxIsNull,
+
+	UnknownError,
 };
 
 constexpr const char* errorcode2string(const ErrorCodes code)
@@ -24,6 +26,8 @@ constexpr const char* errorcode2string(const ErrorCodes code)
 	{
 	case NoError:					return "NO_ERROR";
 	case FileNotFound:				return "FILE_NOT_FOUND";
+	case DirectoryNotFound:			return "DIRECTORY_NOT_FOUND";
+	case InvalidExtension:			return "INVALID_FILE_EXTENSION";
 	case CellSizeNotDefined:		return "CELL_SIZE_NOT_DEFINED";
 	case StrutRadiusNotDefined:		return "STRUT_RADIUS_NOT_DEFINED";
 	case CantDetermineLatticeType:	return "CANT_DETERMINE_LATTICE_TYPE";

LatticeDehomogenization/src/inputParsing/ParseCommandLine.h

@@ -2,6 +2,7 @@
 #include <unordered_map>
 #include <unordered_set>
 #include <string>
+#include <sys/stat.h>
 
 #include "ErrorCodes.h"
 
@@ -21,6 +22,23 @@ private:
 	std::vector<ErrorCodes> _errors;
 	std::vector<std::string> _errorMsgs;
 
+	bool directoryExists(const std::string& filepath)
+	{
+		size_t directoryIdx = filepath.find_last_of('/');
+		if (directoryIdx == std::string::npos)
+			directoryIdx = filepath.find_last_of('\\');
+
+		// Isnt a directory. Just a file name to be placed in current path
+		if (directoryIdx == std::string::npos)
+			return true;
+
+		struct stat sb;
+		if (stat(filepath.substr(0, directoryIdx).c_str(), &sb) == 0)
+			return true; // Valid path
+		else
+			return false; // directory not found
+	}
+
 
 private:
 	static AcceptedKeys s_validKeys;
@@ -44,6 +62,14 @@ public:
 				_errorMsgs.emplace_back(key);
 			}
 		}
+		if (hasKey("input"))
+		{
+			if (!directoryExists(getValue("input")))
+			{
+				_errors.emplace_back(ErrorCodes::DirectoryNotFound);
+				_errorMsgs.emplace_back(getValue("input"));
+			}
+		}
 	}
 
 	inline const std::string& getValue(const std::string& key) const