Add command for close section for commit

[bakunyo]

Hello, jreybert.

I want to add a command that can close commit section.
Added key 'CU' means 'commit undo'.

Could you see this PR and merge if the commit is acceptable.

[bakunyo]

Additional comment.
Once open a commit section, it keep on showing without commit done or quit vim.
So I want to close commit section.

[jreybert]

Hi bakunyo,

thanks for your PR! I had it in my mind for a while, and I never took the time to add it. You did a good job, too bad that travis is unstable at this moment. I don't see why your commit would fail with the test suite, I think it should be OK. We will see when travis will be back to normal.

Anyway, waiting for travis revival, I would have sevral requests to make this PR complete:

• rebase your commit upon next branch
• add this new command CU in README and doc/magit.txt
• the function must do nothing if b:magit_current_commit_mode == ''
• when you cancel the commit, could you write the current commit message (using s:mg_get_commit_msg()) in the COMMIT_EDITMSG file (see s:mg_get_commit_section())

Thanks

[zimski]

Hello,
Vimagit act as a regular vim buffer, so i think just pressing (u key) is good enough or maybe i miss something :)

Need to press two times the u key if you start writing the commit

[bakunyo]

Hello jreybert,

Thanks for comment!
I have sent another PR #55 , includes some commits referenced your comments.

[bakunyo]

Hello zimski,

Thanks for your comment.
It can almost solve closing-commit-section problems!

Though in rare cases, some changes might be staged or unstaged after commit section opened.
Then this 'CU' command looks attractive I think.

[bakunyo]

Sorry for sending too PRs.
I wonder which branch(master or next) should be received PR.

Could you close either isn't needed.

[jreybert]

@zimski no, just pressing 'u' won't be enough. vimagit is not a nomrla vim buffer. It has some internal variable states. It has one to check that a commit message write is ongoing. Just pressing 'u' won't update this variable.