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@2: HgDataFile.history() or Changelog.history(file)?
tikhomirov@2: 
tikhomirov@2: 
tikhomirov@2: Changelog.all() to return list with placeholder, not-parsed elements (i.e. read only compressedLen field and skip to next record), so that
tikhomirov@2: total number of elements in the list is correct
tikhomirov@1: 
tikhomirov@1: hg cat
tikhomirov@2: Implementation: logic to find file by name in the repository is the same with Log and other commands
tikhomirov@2: 
tikhomirov@2: 
tikhomirov@2: Revlog
tikhomirov@2: What happens when big entry is added to a file - when it detects it can't longer fit into .i and needs .d? Inline flag and .i format changes?