question: @ NotNull public Couple < HgRevisionNumber > identify ( @ NotNull VirtualFile repo ) { HgCommandExecutor commandExecutor = new HgCommandExecutor ( myProject ) ; commandExecutor . setSilent ( true ) ; HgCommandResult result = commandExecutor . executeInCurrentThread ( repo , "identify" , Arrays . asList ( "--num" , "--id" ) ) ; if ( result == null ) { return Couple . of ( HgRevisionNumber . NULL_REVISION_NUMBER , null ) ; } final List < String > lines = result . getOutputLines ( ) ; if ( lines != null && ! lines . isEmpty ( ) ) { List < String > parts = StringUtil . split ( lines . get ( 0 ) , " " ) ; String changesets = parts . get ( 0 ) ; String revisions = parts . get ( 1 ) ; if ( parts . size ( ) >= 2 ) { if ( changesets . indexOf ( '+' ) != changesets . lastIndexOf ( '+' ) ) { List < String > chsets = StringUtil . split ( changesets , "+" ) ; List < String > revs = StringUtil . split ( revisions , "+" ) ; return Couple . of ( HgRevisionNumber . getInstance ( revs . get ( 0 ) + "+" , chsets . get ( 0 ) + "+" ) , HgRevisionNumber . getInstance ( revs . get ( 1 ) + "+" , chsets . get ( 1 ) + "+" ) ) ; } else { return Couple . of ( HgRevisionNumber . getInstance ( revisions , changesets ) , null ) ; } } } return Couple . of ( HgRevisionNumber . NULL_REVISION_NUMBER , null ) ; }
target:  Returns the result of 'hg id' execution, i.e. current state of the repository.