make nova bash-complete faster and more accurate

- cache output of "nova bash-complete"
- distinguish between flags and commands (based on already typed text)

Change-Id: I85bd1c2198eef222540cf12063a3b233b0d6db12

1 files changed, 21 insertions, 9 deletions

diff --git a/tools/nova.bash_completion b/tools/nova.bash_completion
index 90d16c0c..43390052 100644
--- a/tools/nova.bash_completion
+++ b/tools/nova.bash_completion
@@ -1,15 +1,27 @@
+_nova_opts="" # lazy init
+_nova_flags="" # lazy init
+_nova_opts_exp="" # lazy init
 _nova()
 {
-    local cur prev opts
-    COMPREPLY=()
-    cur="${COMP_WORDS[COMP_CWORD]}"
-    prev="${COMP_WORDS[COMP_CWORD-1]}"
+	local cur prev nbc cflags
+	COMPREPLY=()
+	cur="${COMP_WORDS[COMP_CWORD]}"
+	prev="${COMP_WORDS[COMP_CWORD-1]}"
 
-    opts="$(nova bash_completion)"
+	if [ "x$_nova_opts" == "x" ] ; then
+		nbc="`nova bash-completion`"
+		_nova_opts="`echo "$nbc" | sed -e "s/--[a-z0-9_-]*//g" -e "s/\s\s*/ /g"`"
+		_nova_flags="`echo " $nbc" | sed -e "s/ [^-][^-][a-z0-9_-]*//g" -e "s/\s\s*/ /g"`"
+		_nova_opts_exp="`echo "$_nova_opts" | sed -e "s/\s/|/g"`"
+	fi
 
-    COMPLETION_CACHE=~/.novaclient/*/*-cache
-    opts+=" "$(cat $COMPLETION_CACHE 2> /dev/null | tr '\n' ' ')
-
-    COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+	if [[ " ${COMP_WORDS[@]} " =~ " "($_nova_opts_exp)" " && "$prev" != "help" ]] ; then
+		COMPLETION_CACHE=~/.novaclient/*/*-cache
+		cflags="$_nova_flags "$(cat $COMPLETION_CACHE 2> /dev/null | tr '\n' ' ')
+		COMPREPLY=($(compgen -W "${cflags}" -- ${cur}))
+	else
+		COMPREPLY=($(compgen -W "${_nova_opts}" -- ${cur}))
+	fi
+	return 0
 }
 complete -F _nova nova