completion: remove __git_index_file_list_filter()

Refactor the code into the only caller; __git_index_files().

Also, Somehow messing up with the 'path' variable messes up the 'PATH'
variable. So let's not do that.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -259,23 +259,6 @@ __gitcomp_file ()
 	compgen -f /non-existing-dir/ > /dev/null
 }
 
-# Process path list returned by "ls-files" and "diff-index --name-only"
-# commands, in order to list only file names relative to a specified
-# directory, and append a slash to directory names.
-__git_index_file_list_filter ()
-{
-	local path
-
-	while read -r path; do
-		case "$path" in
-		?*/*)
-			echo "${path%%/*}" ;;
-		*)
-			echo "$path" ;;
-		esac
-	done
-}
-
 # Execute 'git ls-files', unless the --committable option is specified, in
 # which case it runs 'git diff-index' to find out the files that can be
 # committed.  It return paths relative to the directory specified in the first
@@ -303,11 +286,16 @@ __git_ls_files_helper ()
 #    slash.
 __git_index_files ()
 {
-	local dir="$(__gitdir)" root="${2-.}"
+	local dir="$(__gitdir)" root="${2-.}" file
 
 	if [ -d "$dir" ]; then
-		__git_ls_files_helper "$root" "$1" | __git_index_file_list_filter |
-			sort | uniq
+		__git_ls_files_helper "$root" "$1" |
+		while read -r file; do
+			case "$file" in
+			?*/*) echo "${file%%/*}" ;;
+			*) echo "$file" ;;
+			esac
+		done | sort | uniq
 	fi
 }