Improve autocompletion functionality for 'enabler' command

enabler/commands/enabler_completion.sh

@@ -0,0 +1,55 @@
+_enabler_complete() {
+    local cur_word prev_word commands
+
+    # Get the current and previous words
+    cur_word="${COMP_WORDS[COMP_CWORD]}"
+    prev_word="${COMP_WORDS[COMP_CWORD-1]}"
+    local categories="apps kind preflight platform setup version"
+
+    case "$prev_word" in
+        "enabler") # noqa
+            commands="$categories"
+            ;;
+    esac
+
+    # Initialize the variable to store previous words
+    prev_words=""
+    local apps="namespace"
+    local kind="create delete status start stop"
+    local platform="init info keys release version"
+    local setup="init metallb istio"
+
+    # Loop through previous words and concatenate them
+    for ((i=1; i<COMP_CWORD; i++)); 
+    do
+        prev_words="${prev_words}${COMP_WORDS[i]} "
+    done
+
+    # Trim any trailing whitespace
+    prev_words="${prev_words% }"
+
+    case "$prev_words" in
+        "enabler apps")
+            commands="$commands $apps"
+            ;;
+        "enabler kind")
+            commands="$commands $kind"
+            ;;
+        "enabler platform")
+            commands="$commands $platform"
+            ;;
+        "enabler setup")
+            commands="$commands $setup"
+            ;;
+    esac
+
+    echo ""
+    echo "$commands"
+
+    if [[ "$cur_word" == "$prev_word"* ]]; then
+        COMPREPLY=( $(compgen -W "$commands" -- "$cur_word") )
+    fi
+}
+
+# Register _enabler_complete to provide completion for the enabler command
+complete -F _enabler_complete enabler