Update bash completions to prevent unbound variable errors.

index 7b074d7..50e345f 100755
@@ -52,25 +52,25 @@ esac
 
 __gitdir ()
 {
-	if [ -z "$1" ]; then
-		if [ -n "$__git_dir" ]; then
+	if [ -z "${1-}" ]; then
+		if [ -n "${__git_dir-}" ]; then
 			echo "$__git_dir"
 		elif [ -d .git ]; then
 			echo .git
 		else
 			git rev-parse --git-dir 2>/dev/null
 		fi
-	elif [ -d "$1/.git" ]; then
-		echo "$1/.git"
+	elif [ -d "${1-}/.git" ]; then
+		echo "${1-}/.git"
 	else
-		echo "$1"
+		echo "${1-}"
 	fi
 }
 
 __git_ps1 ()
 {
 	local g="$(git rev-parse --git-dir 2>/dev/null)"
-	if [ -n "$g" ]; then
+	if [ -n "${g-}" ]; then
 		local r
 		local b
 		if [ -d "$g/rebase-apply" ]

@@ -111,8 +111,8 @@ __git_ps1 ()
 			fi
 		fi
 
-		if [ -n "$1" ]; then
-			printf "$1" "${b##refs/heads/}$r"
+		if [ -n "${1-}" ]; then
+			printf "${1-}" "${b##refs/heads/}$r"
 		else
 			printf " (%s)" "${b##refs/heads/}$r"
 		fi

@@ -122,11 +122,11 @@ __git_ps1 ()
 __gitcomp_1 ()
 {
 	local c IFS=' '$'\t'$'\n'
-	for c in $1; do
-		case "$c$2" in
-		--*=*) printf %s$'\n' "$c$2" ;;
-		*.)    printf %s$'\n' "$c$2" ;;
-		*)     printf %s$'\n' "$c$2 " ;;
+	for c in ${1-}; do
+		case "$c${2-}" in
+		--*=*) printf %s$'\n' "$c${2-}" ;;
+		*.)    printf %s$'\n' "$c${2-}" ;;
+		*)     printf %s$'\n' "$c${2-} " ;;
 		esac
 	done
 }

@@ -135,7 +135,7 @@ __gitcomp ()
 {
 	local cur="${COMP_WORDS[COMP_CWORD]}"
 	if [ $# -gt 2 ]; then
-		cur="$3"
+		cur="${3-}"
 	fi
 	case "$cur" in
 	--*=)

@@ -143,8 +143,8 @@ __gitcomp ()
 		;;
 	*)
 		local IFS=$'\n'
-		COMPREPLY=($(compgen -P "$2" \
-			-W "$(__gitcomp_1 "$1" "$4")" \
+		COMPREPLY=($(compgen -P "${2-}" \
+			-W "$(__gitcomp_1 "${1-}" "${4-}")" \
 			-- "$cur"))
 		;;
 	esac

@@ -152,13 +152,13 @@ __gitcomp ()
 
 __git_heads ()
 {
-	local cmd i is_hash=y dir="$(__gitdir "$1")"
+	local cmd i is_hash=y dir="$(__gitdir "${1-}")"
 	if [ -d "$dir" ]; then
 		git --git-dir="$dir" for-each-ref --format='%(refname:short)' \
 			refs/heads
 		return
 	fi
-	for i in $(git ls-remote "$1" 2>/dev/null); do
+	for i in $(git ls-remote "${1-}" 2>/dev/null); do
 		case "$is_hash,$i" in
 		y,*) is_hash=n ;;
 		n,*^{}) is_hash=y ;;

@@ -170,13 +170,13 @@ __git_heads ()
 
 __git_tags ()
 {
-	local cmd i is_hash=y dir="$(__gitdir "$1")"
+	local cmd i is_hash=y dir="$(__gitdir "${1-}")"
 	if [ -d "$dir" ]; then
 		git --git-dir="$dir" for-each-ref --format='%(refname:short)' \
 			refs/tags
 		return
 	fi
-	for i in $(git ls-remote "$1" 2>/dev/null); do
+	for i in $(git ls-remote "${1-}" 2>/dev/null); do
 		case "$is_hash,$i" in
 		y,*) is_hash=n ;;
 		n,*^{}) is_hash=y ;;

@@ -188,7 +188,7 @@ __git_tags ()
 
 __git_refs ()
 {
-	local i is_hash=y dir="$(__gitdir "$1")"
+	local i is_hash=y dir="$(__gitdir "${1-}")"
 	local cur="${COMP_WORDS[COMP_CWORD]}" format refs
 	if [ -d "$dir" ]; then
 		case "$cur" in

@@ -221,7 +221,7 @@ __git_refs ()
 __git_refs2 ()
 {
 	local i
-	for i in $(__git_refs "$1"); do
+	for i in $(__git_refs "${1-}"); do
 		echo "$i:$i"
 	done
 }

@@ -229,11 +229,11 @@ __git_refs2 ()
 __git_refs_remotes ()
 {
 	local cmd i is_hash=y
-	for i in $(git ls-remote "$1" 2>/dev/null); do
+	for i in $(git ls-remote "${1-}" 2>/dev/null); do
 		case "$is_hash,$i" in
 		n,refs/heads/*)
 			is_hash=y
-			echo "$i:refs/remotes/$1/${i#refs/heads/}"
+			echo "$i:refs/remotes/${1-}/${i#refs/heads/}"
 			;;
 		y,*) is_hash=n ;;
 		n,*^{}) is_hash=y ;;

@@ -264,7 +264,7 @@ __git_remotes ()
 
 __git_merge_strategies ()
 {
-	if [ -n "$__git_merge_strategylist" ]; then
+	if [ -n "${__git_merge_strategylist-}" ]; then
 		echo "$__git_merge_strategylist"
 		return
 	fi

@@ -350,7 +350,7 @@ __git_complete_revlist ()
 
 __git_all_commands ()
 {
-	if [ -n "$__git_all_commandlist" ]; then
+	if [ -n "${__git_all_commandlist-}" ]; then
 		echo "$__git_all_commandlist"
 		return
 	fi

@@ -368,7 +368,7 @@ __git_all_commandlist="$(__git_all_commands 2>/dev/null)"
 
 __git_porcelain_commands ()
 {
-	if [ -n "$__git_porcelain_commandlist" ]; then
+	if [ -n "${__git_porcelain_commandlist-}" ]; then
 		echo "$__git_porcelain_commandlist"
 		return
 	fi

@@ -473,7 +473,7 @@ __git_aliases ()
 __git_aliased_command ()
 {
 	local word cmdline=$(git --git-dir="$(__gitdir)" \
-		config --get "alias.$1")
+		config --get "alias.${1-}")
 	for word in $cmdline; do
 		if [ "${word##-*}" ]; then
 			echo $word

@@ -488,7 +488,7 @@ __git_find_subcommand ()
 
 	while [ $c -lt $COMP_CWORD ]; do
 		word="${COMP_WORDS[c]}"
-		for subcommand in $1; do
+		for subcommand in ${1-}; do
 			if [ "$subcommand" = "$word" ]; then
 				echo "$subcommand"
 				return

@@ -599,7 +599,7 @@ _git_bisect ()
 
 	local subcommands="start bad good skip reset visualize replay log run"
 	local subcommand="$(__git_find_subcommand "$subcommands")"
-	if [ -z "$subcommand" ]; then
+	if [ -z "${subcommand-}" ]; then
 		__gitcomp "$subcommands"
 		return
 	fi

@@ -1371,7 +1371,7 @@ _git_remote ()
 {
 	local subcommands="add rm show prune update"
 	local subcommand="$(__git_find_subcommand "$subcommands")"
-	if [ -z "$subcommand" ]; then
+	if [ -z "${subcommand-}" ]; then
 		__gitcomp "$subcommands"
 		return
 	fi

@@ -1500,7 +1500,7 @@ _git_stash ()
 {
 	local subcommands='save list show apply clear drop pop create branch'
 	local subcommand="$(__git_find_subcommand "$subcommands")"
-	if [ -z "$subcommand" ]; then
+	if [ -z "${subcommand-}" ]; then
 		__gitcomp "$subcommands"
 	else
 		local cur="${COMP_WORDS[COMP_CWORD]}"

@@ -1552,7 +1552,7 @@ _git_svn ()
 		proplist show-ignore show-externals
 		"
 	local subcommand="$(__git_find_subcommand "$subcommands")"
-	if [ -z "$subcommand" ]; then
+	if [ -z "${subcommand-}" ]; then
 		__gitcomp "$subcommands"
 	else
 		local remote_opts="--username= --config-dir= --no-auth-cache"

@@ -1672,7 +1672,7 @@ _git ()
 		c=$((++c))
 	done
 
-	if [ -z "$command" ]; then
+	if [ -z "${command-}" ]; then
 		case "${COMP_WORDS[COMP_CWORD]}" in
 		--*=*) COMPREPLY=() ;;
 		--*)   __gitcomp "