Version control system git like

Following the excellent article https://www.leshenko.net/p/ugit/

I have done some modifications

• The data module is renammed as the storage because it handles every interaction with the filesystem getting and putting objects
• The base module is renammed as the tree because it contains the hight level structure of a Tree, based on the storage module.
• The code is written using TDD approche. You will find unit tests for each exported functions.

vcs [<flags>] <command> [<args> ...]

Snapshot your working directory

Flags:
  --help  Show context-sensitive help (also try --help-long and --help-man).

Commands:
  help [<command>...]
    Show help.

  commit --message=MESSAGE [<flags>]
    snapshot the current directory with an explicite message desciption

  init [<dir>]
    Setup the directory you want to be managed

  log [<ref>]
    Print the commit log history

  hash_object [<flags>] <content>
    Save an object in vcs and get its hash

  checkout [<flags>] <oid>
    Restore files and folders from a committed snapshot

  tag <name>
    Give a name to the current commit

  branch
    Print all created branches

# install using go package manager
go get github.com/BenJoyenConseil/vcs

# init to your working directory
cd my_project
vcs init

• commit -m "add description" : snapshot the current directory and save its version for later
• hash_object : add a new object in the datastore folder ./.ugit/objects/
• log : print the graph of commit log
• HEAD : pointer to the last commit, the current working
• checkout : restore files and folders of a specific committed snapshot
• tag : mark and identify a commit with a simplified name (instead of its hash)
• branch : tag/ref that moves to point on the last commit of the branch
• graph : print branches history and tags with HEAD position
• diff : see the differences of content between 2 working trees
• status : show the current branch, the staging files
• merge : merge content of two branches and create a merge commit with 2 parents
• fast-forward : during a merge, see if HEAD is a ancestor of the head commit of the branch
• index : commit only tracked files
• stash : push pending changes to a stack and remove them of the index
• cherry-pick : pick a commit from a branch and add it to another branch
• rebase : play the branch history to another branch history, and get it linear