gnodet commented on code in PR #2117:
URL: https://github.com/apache/maven/pull/2117#discussion_r1967309050


##########
impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/mvnsh/builtin/BuiltinShellCommandRegistryFactory.java:
##########
@@ -75,15 +75,14 @@ private BuiltinShellCommandRegistry(LookupContext 
shellContext) {
             this.mavenParser = new MavenParser();
             this.shellEncryptInvoker = new 
EncryptInvoker(shellContext.invokerRequest.lookup(), contextCopier());
             this.encryptParser = new EncryptParser();
-            Set<Command> commands = new 
HashSet<>(EnumSet.allOf(Command.class));
-            Map<Command, String> commandName = new HashMap<>();
-            Map<Command, CommandMethods> commandExecute = new HashMap<>();
-            for (Command c : commands) {
-                commandName.put(c, c.name().toLowerCase());
-            }
-            commandExecute.put(Command.MVN, new CommandMethods(this::mvn, 
this::mvnCompleter));
-            commandExecute.put(Command.MVNENC, new 
CommandMethods(this::mvnenc, this::mvnencCompleter));
-            registerCommands(commandName, commandExecute);
+            Map<String, CommandMethods> commandExecute = new HashMap<>();
+            commandExecute.put("!", new CommandMethods(this::shell, 
this::defaultCompleter));
+            commandExecute.put("cd", new CommandMethods(this::cd, 
this::cdCompleter));
+            commandExecute.put("ls", new CommandMethods(this::ls, 
this::defaultCompleter));

Review Comment:
   JLine [defines a bunch of 
commands](https://github.com/jline/jline3/blob/master/demo/src/main/java/org/apache/felix/gogo/jline/Posix.java)
 already.  They are currently leveraging Felix Gogo, but it should be fairly 
easy to abstract from it and make them reusable.  
   Would that make sense to reuse them here ?



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