Support git aliases

[hongquan]

I have alias for some Git commands:

# ~/.gitconfig
[alias]
	co = checkout
	br = branch
	ci = commit
	st = status
	ps = push
	unstage = reset HEAD --

From Nushell, after typing git co and tabbing, I expects to get list of branches in auto-complete, but I got list of subdirectories instead.

[fdncred]

I believe the aliases would need to be added to the git_completions.nu to make this work.

[lisiur]

I don't think this pr fix this issue. git co [TAB] still does not show branches

[hongquan]

@lisiur Right, the PR #1044 only provides auto-complete for Git subcommands (git checkout, git switch, etc.), not auto-complete for Git aliases. Nu still doesn't support this case yet.

[Kissaki]

It works for me, with the current git-completions.nu and current Nushell.

The script currently calls nu-complete git subcommands which calls ^git help -a which lists commands including aliases.

nu ❯ | git svn
svn                 Bidirectional operation between a Subversion repository and Git
svnd                svn dcommit
svnl                svn log --oneline --show-commit
svnr                svn rebase
update-server-info  Update auxiliary info file to help dumb servers

nu ❯ ^git config --global alias.co checkout
                                                                                                                                                      took 61ms
nu ❯ | git co
co                                      checkout
column                                  Display data in columns
commit                                  Record changes to the repository

[hongquan]

My previous comment meant that, if you type git co, then Tab, Nu won't provide the auto-complete like you do with git checkout.