fix regression causing duplicated output

The command refactoring caused subcommand handlers to produce duplicate
output when run.  The problem was introduced by failing to ensure all
such invocations went through a top-level "catcher" script, prefixing
the command name with the 'ocd_' prefix and consuming its results.

The fix is to ensure such a top-level "catcher" script gets created
for each top-level command, regardless of whether it has a handler.
Indeed, this patch removes all command registrations for sub-commands,
which would not have worked in the new registration scheme anyway.

For now, dispatch of subcommands continues to be handled by the new
'unknown' command handler, which gets fixed here to strip the 'ocd_'
prefix if searching for the top-level command name fails initially.
Some Jim commands may be registered with this prefix, and that situation
seems to require the current fallback approach.  Otherwise, that prefix
could be stripped unconditionally and the logic made a little simpler.
The same problem must be handled by the 'help' command handler too,
so its lookup process works as intended.

Overall, the command dispatching remains more complicated than desired,
but this patch fixes the immediate regressions.

1 files changed, 28 insertions, 13 deletions

diff --git a/src/helper/command.c b/src/helper/command.c
index 62fb487..65421f5 100644
--- a/src/helper/command.c
+++ b/src/helper/command.c
@@ -44,6 +44,9 @@
 #include "jim-eventloop.h"
 
 
+/* nice short description of source file */
+#define __THIS__FILE__ "command.c"
+
 Jim_Interp *interp = NULL;
 
 static int run_command(struct command_context *context,
@@ -185,8 +188,12 @@ static int script_command(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 	return script_command_run(interp, argc, argv, c, true);
 }
 
-/* nice short description of source file */
-#define __THIS__FILE__ "command.c"
+static struct command *command_root(struct command *c)
+{
+	while (NULL != c->parent)
+		c = c->parent;
+	return c;
+}
 
 /**
  * Find a command by name from a list of commands.
@@ -296,19 +303,22 @@ static int register_command_handler(struct command *c)
 	if (NULL == full_name)
 		return retval;
 
-	const char *ocd_name = alloc_printf("ocd_%s", full_name);
-	if (NULL == full_name)
-		goto free_full_name;
+	if (NULL != c->handler)
+	{
+		const char *ocd_name = alloc_printf("ocd_%s", full_name);
+		if (NULL == full_name)
+			goto free_full_name;
 
-	Jim_CreateCommand(interp, ocd_name, script_command, c, NULL);
-	free((void *)ocd_name);
+		Jim_CreateCommand(interp, ocd_name, script_command, c, NULL);
+		free((void *)ocd_name);
+	}
 
 	/* we now need to add an overrideable proc */
 	const char *override_name = alloc_printf("proc %s {args} {"
 			"if {[catch {eval ocd_%s $args}] == 0} "
 			"{return \"\"} else {return -code error}}",
 			full_name, full_name);
-	if (NULL == full_name)
+	if (NULL == override_name)
 		goto free_full_name;
 
 	Jim_Eval_Named(interp, override_name, __THIS__FILE__, __LINE__);
@@ -343,7 +353,7 @@ struct command* register_command(struct command_context *context,
 
 	if (NULL != c->handler)
 	{
-		int retval = register_command_handler(c);
+		int retval = register_command_handler(command_root(c));
 		if (ERROR_OK != retval)
 		{
 			unregister_command(context, parent, name);
@@ -792,6 +802,8 @@ static COMMAND_HELPER(command_help_find, struct command *head,
 	if (0 == CMD_ARGC)
 		return ERROR_INVALID_ARGUMENTS;
 	*out = command_find(head, CMD_ARGV[0]);
+	if (NULL == *out && strncmp(CMD_ARGV[0], "ocd_", 4) == 0)
+		*out = command_find(head, CMD_ARGV[0] + 4);
 	if (NULL == *out)
 		return ERROR_INVALID_ARGUMENTS;
 	if (--CMD_ARGC == 0)
@@ -875,15 +887,18 @@ COMMAND_HANDLER(handle_help_command)
 }
 
 static int command_unknown_find(unsigned argc, Jim_Obj *const *argv,
-		struct command *head, struct command **out)
+		struct command *head, struct command **out, bool top_level)
 {
 	if (0 == argc)
 		return argc;
-	struct command *c = command_find(head, Jim_GetString(argv[0], NULL));
+	const char *cmd_name = Jim_GetString(argv[0], NULL);
+	struct command *c = command_find(head, cmd_name);
+	if (NULL == c && top_level && strncmp(cmd_name, "ocd_", 4) == 0)
+		c = command_find(head, cmd_name + 4);
 	if (NULL == c)
 		return argc;
 	*out = c;
-	return command_unknown_find(--argc, ++argv, (*out)->children, out);
+	return command_unknown_find(--argc, ++argv, (*out)->children, out, false);
 }
 
 static int command_unknown(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
@@ -893,7 +908,7 @@ static int command_unknown(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 
 	struct command_context *cmd_ctx = current_command_context();
 	struct command *c = cmd_ctx->commands;
-	int remaining = command_unknown_find(argc - 1, argv + 1, c, &c);
+	int remaining = command_unknown_find(argc - 1, argv + 1, c, &c, true);
 	// if nothing could be consumed, then it's really an unknown command
 	if (remaining == argc - 1)
 	{