Command-line/API for Schema Compare in SSDT SQL Server Database Project?

In Visual Studio 2012, we have Schema Compare in SSDT's SQL Server Database Project (DbProject) project which helps

1. Compare source versus target
2. Update target to make it the same as source

Where

1. Source and target can be either a database, a DbProject project, or a .dacpac file
2. Update can be done via an update action or generated script

My question is that is it possible to have and where can I get the command-line/API interface to call this feature?