tikhomirov@1: FileStructureWalker (pass HgFile, HgFolder to callable; which can ask for VCS data from any file)
tikhomirov@1: External uses: user browses files, selects one and asks for its history 
tikhomirov@1: Params: tip/revision; 
tikhomirov@1: Implementation: manifest
tikhomirov@1: 
tikhomirov@1: Log --rev
tikhomirov@1: Log <file>
tikhomirov@1: 
tikhomirov@1: hg cat
tikhomirov@1: Implementation: logic to find file by name in the repository is the same with Log and other commands