[PATCH 6/6] Use git-describe --exact-match in bash prompt on detached HEAD

Most of the time when I am on a detached HEAD and I am not doing
a rebase or bisect operation the working directory is sitting on a
tagged release of the repository.  Showing the tag name instead of
the commit SHA-1 is much more descriptive and a much better reminder
of the state of this working directory.

Now that git-describe --exact-match is available as a cheap means
of obtaining the exact annotated tag or nothing at all, we can
favor the annotated tag name over the abbreviated commit SHA-1.

Signed-off-by: Shawn O. Pearce <redacted>
---
 contrib/completion/git-completion.bash |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 4ea727b..8722a68 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash

@@ -91,7 +91,10 @@ __git_ps1 ()
 			fi
 			if ! b="$(git symbolic-ref HEAD 2>/dev/null)"
 			then
-				b="$(cut -c1-7 $g/HEAD)..."
+				if ! b="$(git describe --exact-match HEAD 2>/dev/null)"
+				then
+					b="$(cut -c1-7 $g/HEAD)..."
+				fi
 			fi
 		fi
 

-- 
1.5.4.3.295.g6b554