Currently the __git_ps1 git prompt gives the following error with a
repository converted by git-svn, when used with zsh:

   __git_ps1_show_upstream:19: bad pattern: svn_remote[
   __git_ps1_show_upstream:45: bad substitution

To reproduce the problem, the __git_ps1_show_upstream function can be
executed in a repository converted with git-svn.  Both those errors are
triggered by spaces after the '['.

Zsh also doesn't support initializing an array with `local var=(...)`.
This triggers the following error:

   __git_ps1_show_upstream:41: bad pattern: svn_upstream=(commit

Use
   local -a
   var=(...)
instead to make is compatible.

This was introduced by 6d158cba (bash completion: Support "divergence
from upstream" messages in __git_ps1), when the script was for bash
only.

Signed-off-by: Thomas Gummerer <t.gumme...@gmail.com>
---
 contrib/completion/git-prompt.sh | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index eaf5c36..b6b1534 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -124,7 +124,7 @@ __git_ps1_show_upstream ()
                        fi
                        ;;
                svn-remote.*.url)
-                       svn_remote[ $((${#svn_remote[@]} + 1)) ]="$value"
+                       svn_remote[$((${#svn_remote[@]} + 1))]="$value"
                        svn_url_pattern+="\\|$value"
                        upstream=svn+git # default upstream is SVN if 
available, else git
                        ;;
@@ -146,10 +146,11 @@ __git_ps1_show_upstream ()
        svn*)
                # get the upstream from the "git-svn-id: ..." in a commit 
message
                # (git-svn uses essentially the same procedure internally)
-               local svn_upstream=($(git log --first-parent -1 \
+               local -a svn_upstream
+               svn_upstream=($(git log --first-parent -1 \
                                        --grep="^git-svn-id: 
\(${svn_url_pattern#??}\)" 2>/dev/null))
                if [[ 0 -ne ${#svn_upstream[@]} ]]; then
-                       svn_upstream=${svn_upstream[ ${#svn_upstream[@]} - 2 ]}
+                       svn_upstream=${svn_upstream[${#svn_upstream[@]} - 2]}
                        svn_upstream=${svn_upstream%@*}
                        local n_stop="${#svn_remote[@]}"
                        for ((n=1; n <= n_stop; n++)); do
-- 
1.8.3.rc2.359.g2fb82f5

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