[PATCH] Completion must sort before using uniq

[Marc Khouzam <marc.khouzam@gmail.com>]

The uniq program only works with sorted input.  The man page states
"uniq prints the unique lines in a sorted file".

When __git_refs use the guess heuristic employed by checkout for
tracking branches it wants to consider remote branches but only if
the branch name is unique.  To do that, it calls 'uniq -u'.  However
the input given to 'uniq -u' is not sorted.

For example if all available branches are:
  master
  remotes/GitHub/maint
  remotes/GitHub/master
  remotes/origin/maint
  remotes/origin/master

When performing completion on 'git checkout ma' the choices given are
  maint
  master
but when performing completion on 'git checkout mai', no choices
appear, which is obviously contradictory.

The reason is that, when dealing with 'git checkout ma',
"__git_refs '' 1" will find the following list:
  master
  maint
  master
  maint
  master
which, when passed to 'uniq -u' will remain the same.
But when dealing with 'git checkout mai', the list will be:
  maint
  maint
which happens to be sorted and will be emptied by 'uniq -u'.

The solution is to first call 'sort' and then 'uniq -u'.

Signed-off-by: Marc Khouzam <marc.khouzam@gmail.com>
---

I ran into this by fluke when testing the tcsh completion.

Thanks for considering the fix.

Marc

 contrib/completion/git-completion.bash | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash
b/contrib/completion/git-completion.bash
index bc0657a..85ae419 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -321,7 +321,7 @@ __git_refs ()
                                if [[ "$ref" == "$cur"* ]]; then
                                        echo "$ref"
                                fi
-                       done | uniq -u
+                       done | sort | uniq -u
                fi
                return
        fi
--
1.8.0.1.g9fe2839