Which files of a language project should I check into my SVN/CVS/GIT/etc. version management system?
You should check in all files, except for the bin and include distribution directories. Some Spoofax projects also have a utils directory that does not have to be checked in. Be sure to check in the hidden files/directories that Eclipse maintains (.project, .classpath, and .externalToolBuilders). If you use an Eclipse plugin such as Subclipse, it’ll check these files in automatically. If you want, you can skip some of the .generated files, but at this point the build.generated.xml and lib/editor-common.generated.str files are required to build the project.