7 Jan
                
                    2012
                
            
            
                7 Jan
                
                '12
                
            
            
            
        
    
                1:45 p.m.
            
        So I want to take the sha-1 of the file contents prefixed with a string containing the file size (similar to how git hashes files). Is there a nice way to compose this without having to create two sources against the same file? Thanks, Grant