Add support for Stashes

[kaisellgren]

Add support for a few Stash related features that are needed, wanted and appreciated:

• List stashes
• Destroy a stash
• Create a stash
• Show stash (changes)

This is what Git CLI shows me I can do:

Usage: git stash list [<options>]
   or: git stash show [<stash>]
   or: git stash drop [-q|--quiet] [<stash>]
   or: git stash ( pop | apply ) [--index] [-q|--quiet] [<stash>]
   or: git stash branch <branchname> [<stash>]
   or: git stash [save [--patch] [-k|--[no-]keep-index] [-q|--quiet] [<message>]]
   or: git stash clear

[nulltoken]

Relevant resources:

• https://github.com/git/git/blob/master/Documentation/git-stash.txt
• http://progit.org/book/ch6-3.html
• https://github.com/git/git/blob/master/git-stash.sh
• https://github.com/git/git/blob/master/t/t3903-stash.sh

[nulltoken]

Some work is in progress in libgit2. cf libgit2/libgit2#796

[pmiossec]

I'm interested in that, too...
I don't want to ask for too much but it seems to be commited in libgit2...

[nulltoken]

@pmiossec Current libgit2 stash implementation relies on a git reset --hard which also removes untracked files. Once libgit2/libgit2#1118 is merged, I'll fix the GIT_STASH_INCLUDE_UNTRACKED implementation in libgit2 (cf. https://github.com/git/git/blob/master/git-stash.sh#L244). Then, I'll make it available to LibGit2Sharp (unless a good soul sends a PR before that time, of course ;-) ).

[nulltoken]

Hmm. Another option would be to implement git clean in libgit2 and make git_stash() leverage it.

[nulltoken]

#352 added

• git stash save
• git stash list

[nulltoken]

#375 merged

• git stash drop

[nulltoken]

#1068 added

• git stash pop
• git stash apply