microtask7

1.Which are the common methods of the Graal backends?
Common methods of Graal backends are:

• fetch() :
  syntax : fetch(self, category=CATEGORY_GRAAL, from_date=DEFAULT_DATETIME, to_date=DEFAULT_LAST_DATETIME,branches=None, latest_items=False)
  
  Fetch commits and supports the inclusion of code analysis information. The method retrieves from a repository a list of commits. Commits are returned in the same order they were obtained.
  :param category: the category of items to fetch
  :param from_date: obtain commits newer than a specific date (inclusive)
  :param to_date: obtain commits older than a specific date
  :param branches: names of branches to fetch from (default: None)
  :param latest_items: sync with the repository to fetch only the newest commits
  :returns: a generator of commits.

• metadata_category() :
  syntax : metadata_category(item)
  
  Extracts the category from a Graal item. This backend only generates one type of item which is 'commit'.
  

• analyze() :
  syntax : _analyze(self, commit)
  
  Analyze a commit and the corresponding checkout version of the repository
  :param commit: a Perceval commit item
  

2.List and explain at least 2 Git commands used by Graal (and not implemented in Perceval).
Git commands used by Graal are:

• worktree() :
  syntax : worktree(self, worktreepath, branch=None)
  Create a working tree of the cloned repository with the active branch set to branch.The worktree is needed to perform "write" operations (e.g., git checkout), which cannot be done on a git bare repo.
  :param worktreepath: the path where the working tree will be located
  :param branch: the name of the branch. If None, the branch is set to master
  

• prune() :
  syntax: prune(self)
  Delete a working tree from disk.
  :param worktreepath: directory where the working tree is located.
  

• checkout() :
  syntax : checkout(self, hash)
  Checkout a Git repository at a given commit.
  :param hash: the hash of a commit