bool
FilePlaceholderManager::holdNextPlace( bool const deleteLastPlaceholder )
/* this looks to find the first FilenameTriple in filenameTriples which
* has both a placeholder filename and an output filename which do not yet
* exist in the file system, and returns true if there was such a triple.
* if deleteLastPlaceholder is true, the previous placeholder is also
* deleted, obviously.
*/
{
while( ( filenameTriples.end() > whichTriple )
&&
( UsefulStuff::fileExists( whichTriple->outputFile )
||
UsefulStuff::fileExists( whichTriple->placeholderFile )
||
!(UsefulStuff::fileExists( whichTriple->inputFile )) ) )
{
++whichTriple;
}
if( deleteLastPlaceholder )
{
UsefulStuff::runSystemCommand( "rm " + lastPlaceholder );
}
if( !( filenameTriples.end() > whichTriple ) )
{
return false;
}
lastPlaceholder.assign( whichTriple->placeholderFile );
std::ofstream placeholderStream( lastPlaceholder.c_str() );
placeholderStream << "placeholder" << std::endl;
placeholderStream.close();
return true;
}
// This looks to find the first FilenameTriple in filenameTriples which
// has both a placeholder filename and an output filename which do not yet
// exist in the file system, and returns true if there was such a triple.
// If deleteLastPlaceholder is true, the previous placeholder is also
// deleted.
inline bool
FilePlaceholderManager::HoldNextPlace( bool const deleteLastPlaceholder )
{
bool const foundNextPlace( FindNextPlace() );
if( deleteLastPlaceholder )
{
DeleteFile( lastPlaceholder );
}
if( foundNextPlace )
{
lastPlaceholder.assign( whichTriple->placeholderFile );
std::ofstream placeholderStream( lastPlaceholder.c_str() );
placeholderStream << "This is a placeholder!" << std::endl;
placeholderStream.close();
return true;
}
else
{
return false;
}
}
