在 Git 中是否可以从另一个别名引用别名

Question

Let say I have an alias like this in my .gitconfig:

alias.showlog = log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' 

and now I want a similar alias like this:

alias.sl = showlog --abbrev-commit

When I try the command git sl it say he does not know the showlog command.

I know it is still possible to copy the same command like the other alias, but I just want to know if there is any possibility to refer another alias in an alias?

Answer 1

In versions of Git before 2.20:

Not that way, but you can make an alias run a command through the shell, hence running another instance of git which resolves the second alias:

alias.sl = !git showlog --abbrev-commit

In 2.20 or later, see VonC's answer .

Answer 2

Update Q4 2018: Yes, it is possible possible with Git 2.20: an alias that expands to another alias has so far been forbidden, but now it is allowed to create such an alias.

See commit fef5f7f , commit 82f71d9 , commit c6d75bc (16 Sep 2018) by Tim Schumacher ( timschumi ) .
^{(Merged by Junio C Hamano -- gitster -- in commit 506ee60 , 16 Oct 2018)}

alias : add support for aliases of an alias

Aliases can only contain non-alias git commands and their arguments, not other user-defined aliases. Resolving further (nested) aliases is prevented by breaking the loop after the first alias was processed.
Git then fails with a command-not-found error.

Allow resolving nested aliases by not breaking the loop in run_argv() after the first alias was processed.
Instead, continue the loop until handle_alias() fails, which means that there are no further aliases that can be processed. Prevent looping aliases by storing substituted commands in cmd_list and checking if a command has been substituted previously.

So... this will be possible now:

git config alias.nested-internal-1 nested-internal-2
git config alias.nested-internal-2 status
git nested-internal-1

That would be a git status .

---

With Git 2.30 (Q1 2021), the command line completion script (in contrib/) learned to expand commands that are alias of alias.

See commit e4c75ed (12 Nov 2020), and commit c2822a8 , commit 9414938 (09 Nov 2020) by Felipe Contreras ( felipec ) .
^{(Merged by Junio C Hamano -- gitster -- in commit fd6445a , 25 Nov 2020)}

completion : bash: support recursive aliases

^{Signed-off-by: Felipe Contreras}

It is possible to have recursive aliases like:

 l = log --oneline lg = l --graph

So the completion should detect such aliases as well.