completion: bash: improve function detection

 1. We should quote the argument
 2. We don't need two redirections
 3. A safeguard for arguments (-a) would be good

Suggested-by: René Scharfe <redacted>
Signed-off-by: Felipe Contreras <redacted>
Signed-off-by: Junio C Hamano <redacted>

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 869c73ee2c141ec52807b9734b1195a258aaf09d..1150d4bf4427d398ce08942b74cb090b83343cd2 100644 (file)
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -3359,7 +3359,7 @@ __git_support_parseopt_helper () {
 }
 
 __git_have_func () {
-       declare -f $1 >/dev/null 2>/dev/null
+       declare -f -- "$1" >/dev/null 2>&1
 }
 
 __git_complete_command () {