Fixes #15135: Automatic completion for help in bash and zsh

contrib/completion/bash/yii

@@ -15,6 +15,7 @@ _yii()
     local cur opts yii command
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
     yii="${COMP_WORDS[0]}"
 
     # exit if ./yii does not exist
@@ -31,9 +32,10 @@ _yii()
     [[ $cur == $command ]] && state="command"
     [[ $cur != $command ]] && state="option"
     [[ $cur = *=* ]] && state="value"
+    [[ $prev == "help" ]] && state="help"
 
     case $state in
-        command)
+        command|help)
             # complete command/route if not given
             # fetch available commands from ./yii help/list command
             opts=$($yii help/list 2> /dev/null)

contrib/completion/zsh/_yii

@@ -3,6 +3,7 @@
 _yii() {
     local state command lastArgument commands options executive
     lastArgument=${words[${#words[@]}]}
+    prevArgument=${words[${#words[@]}-1]}
     executive=$words[1]
 
     # lookup for command
@@ -16,9 +17,10 @@ _yii() {
 
     [[ $lastArgument == $command ]] && state="command"
     [[ $lastArgument != $command ]] && state="option"
+    [[ $prevArgument == "help" ]] && state="help"
 
     case $state in
-        command)
+        command|help)
             commands=("${(@f)$(${executive} help/list 2>/dev/null)}")
             _describe 'command' commands
         ;;