[PATCH v2] allow "-" as short-hand for "@{-1}" in "branch -d"

From: rjusto <rjusto@gmail.com>

Align "branch -d" with the intuitive use of "-" as a short-hand for "@{-1}", like in "checkout", "rebase" and "merge" commands.

$ git branch -d - # short-hand for: "git branch -d @{-1}" $ git branch -D - # short-hand for: "git branch -D @{-1}"

So I can do:

$ git checkout work_to_review $ git checkout - $ git merge - # or git rebase - $ git branch -d -

Signed-off-by: rjusto <rjusto@gmail.com>
---
    branch: allow "-" as a short-hand for "previous branch"
    
    Align "branch" with the intuitive use of "-" as a short-hand for
    "@{-1}", like in "checkout" and "merge" commands.
    
    $ git branch -d - # short-hand for: "git branch -d @{-1}" $ git branch
    -D - # short-hand for: "git branch -D @{-1}"
    
    Signed-off-by: rjusto rjusto@gmail.com

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1315%2Frjusto%2Fmaster-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1315/rjusto/master-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1315

Range-diff vs v1:

 1:  3ba75097ea0 ! 1:  0fe48ada15b branch: allow "-" as a short-hand for "previous branch"
     @@ Metadata
      Author: rjusto <rjusto@gmail.com>
      
       ## Commit message ##
     -    branch: allow "-" as a short-hand for "previous branch"
     +    allow "-" as short-hand for "@{-1}" in "branch -d"
      
     -    Align "branch" with the intuitive use of "-" as a short-hand
     -    for "@{-1}", like in "checkout" and "merge" commands.
     +    Align "branch -d" with the intuitive use of "-" as a short-hand
     +    for "@{-1}", like in "checkout", "rebase" and "merge" commands.
      
          $ git branch -d -      # short-hand for: "git branch -d @{-1}"
          $ git branch -D -      # short-hand for: "git branch -D @{-1}"
      
     +    So I can do:
     +
     +    $ git checkout work_to_review
     +    $ git checkout -
     +    $ git merge - # or git rebase -
     +    $ git branch -d -
     +
          Signed-off-by: rjusto <rjusto@gmail.com>
      
       ## builtin/branch.c ##
     @@ builtin/branch.c: static int delete_branches(int argc, const char **argv, int fo
       			die(_("Couldn't look up commit object for HEAD"));
       	}
       
     -+	if ((argc == 1) && !strcmp(argv[0], "-")) {
     ++	if ((argc == 1) && !strcmp(argv[0], "-"))
      +		argv[0] = "@{-1}";
     -+	}
      +
       	for (i = 0; i < argc; i++, strbuf_reset(&bname)) {
       		char *target = NULL;

 builtin/branch.c | 3 +++
 1 file changed, 3 insertions(+)