Move shell completion logic to Java

Refactor bash shell completion to move the majority of the logic into
the Java code. This commit also removes the need for the '--' prefix on
every command.

spring-boot-cli/src/main/content/bash_completion.d/spring

@@ -4,33 +4,19 @@
 
 _spring()
 {
-    local cur prev help helps words cword command commands i
+	local cur prev help helps words cword command commands i
 
-    COMPREPLY=()
-    _get_comp_words_by_ref cur prev words cword
+	_get_comp_words_by_ref cur prev words cword
 
-    commands=( `_parse_help spring | sed -e 's/--//'` )
-    if [[ "$prev" == spring ]]; then
-        for command in "${commands[@]}"; do
-            if [[ "${cur}${command#$cur*}" == "$command" ]]; then
-                COMPREPLY+=("$command")
-            fi
-        done
-        return 0
-    else
-        for command in "${commands[@]}"; do
-            if [[ "$prev" == "$command" && "$cur" == -* ]]; then
-                helps=( `_parse_help 'spring help' $prev` )
-                for help in "${helps[@]:2}"; do
-                    if [[ "${cur}${help#$cur*}" == "$help" ]]; then
-                        COMPREPLY+=("$help")
-                    fi
-                done
-                return 0
-            fi
-        done
-    fi
+	COMPREPLY=()
 
-    _filedir
+	while read -r line; do
+		reply=`echo "$line" | awk '{print $1;}'`
+		COMPREPLY+=("$reply")
+	done < <(spring hint ${cword} ${words[*]})
+
+	if [ $cword -ne 1 ]; then
+		_filedir
+	fi
 
 } && complete -F _spring spring