Fix custom completion args for bash (#320)

Author: Frizlab

Sources/ArgumentParser/Completions/BashCompletionsGenerator.swift

@@ -149,7 +149,7 @@ struct BashCompletionsGenerator {
                 ?? arg.help.keys.first?.rawValue ?? "---"
 
           return """
-            $(\(commandName) ---completion \(subcommandNames) -- \(argumentName) "$COMP_WORDS")
+            $(\(commandName) ---completion \(subcommandNames) -- \(argumentName) "${COMP_WORDS[@]}")
             """
         }
       }
@@ -207,7 +207,7 @@ extension ArgumentDefinition {
     case .custom:
       // Generate a call back into the command to retrieve a completions list
       let commandName = commands.first!._commandName      
-      return #"COMPREPLY=( $(compgen -W "$(\#(commandName) \#(customCompletionCall(commands)) "$COMP_WORDS")" -- "$cur") )"#
+      return #"COMPREPLY=( $(compgen -W "$(\#(commandName) \#(customCompletionCall(commands)) "${COMP_WORDS[@]}")" -- "$cur") )"#
     }
   }
 }

Tests/ArgumentParserExampleTests/MathExampleTests.swift

@@ -325,7 +325,7 @@ _math_stats_stdev() {
 _math_stats_quantiles() {
     opts="--file --directory --shell --custom --version -h --help"
     opts="$opts alphabet alligator branch braggart"
-    opts="$opts $(math ---completion stats quantiles -- customArg "$COMP_WORDS")"
+    opts="$opts $(math ---completion stats quantiles -- customArg "${COMP_WORDS[@]}")"
     if [[ $COMP_CWORD == "$1" ]]; then
         COMPREPLY=( $(compgen -W "$opts" -- "$cur") )
         return
@@ -344,7 +344,7 @@ _math_stats_quantiles() {
             return
         ;;
         --custom)
-            COMPREPLY=( $(compgen -W "$(math ---completion stats quantiles -- --custom "$COMP_WORDS")" -- "$cur") )
+            COMPREPLY=( $(compgen -W "$(math ---completion stats quantiles -- --custom "${COMP_WORDS[@]}")" -- "$cur") )
             return
         ;;
     esac