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Doc/check-ref-format: clarify information about @{-N} syntax

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When the N-th previous thing checked out syntax (@{-N}) is used
with '--branch' option of check-ref-format the result may not be
the name of a branch that currently exists or ever existed. This
is because @{-N} is used to refer to the N-th last checked out
"thing", which might be a commit object name if the previous check
out was a detached HEAD state; or a branch name, otherwise. The
documentation thus does a wrong thing by promoting it as the
"previous branch syntax".

State that @{-N} is the syntax for specifying "N-th last thing
checked out" and also state that the result of using @{-N} might
also result in an commit object name.

Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Kaartic Sivaraam 2017-12-16 13:43:49 +05:30 committed by Junio C Hamano
parent 52015aaf9d
commit c6342e0525
1 changed files with 12 additions and 7 deletions
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19
Documentation/git-check-ref-format.txt
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@ -79,16 +79,21 @@ reference name expressions (see linkgit:gitrevisions[7]):
With the `--branch` option, the command takes a name and checks if
it can be used as a valid branch name (e.g. when creating a new
branch). The rule `git check-ref-format --branch $name` implements
branch). But be cautious when using the
previous checkout syntax that may refer to a detached HEAD state.
The rule `git check-ref-format --branch $name` implements
may be stricter than what `git check-ref-format refs/heads/$name`
says (e.g. a dash may appear at the beginning of a ref component,
but it is explicitly forbidden at the beginning of a branch name).
When run with `--branch` option in a repository, the input is first
expanded for the ``previous branch syntax''
`@{-n}`. For example, `@{-1}` is a way to refer the last branch you
were on. This option should be used by porcelains to accept this
syntax anywhere a branch name is expected, so they can act as if you
typed the branch name.
expanded for the ``previous checkout syntax''
`@{-n}`. For example, `@{-1}` is a way to refer the last thing that
was checked out using "git checkout" operation. This option should be
used by porcelains to accept this syntax anywhere a branch name is
expected, so they can act as if you typed the branch name. As an
exception note that, the ``previous checkout operation'' might result
in a commit object name when the N-th last thing checked out was not
a branch.
OPTIONS
-------
@ -116,7 +121,7 @@ OPTIONS
EXAMPLES
--------
* Print the name of the previous branch:
* Print the name of the previous thing checked out:
+
------------
$ git check-ref-format --branch @{-1}