runtime: command: add an arg to begin_processing() to indicate pipeline position

bshell.runtime/command/command.c

@@ -57,6 +57,11 @@ static const fx_value *command_get_arg(
 	return &cmd->cmd_args[index];
 }
 
+static size_t command_get_arg_count(struct bshell_command_p *cmd)
+{
+	return cmd->cmd_nr_args;
+}
+
 static fx_status get_command_type(
 	const fx_value *cmd_v,
 	const fx_property *prop,
@@ -236,14 +241,25 @@ const fx_value *bshell_command_get_arg(bshell_command *cmd, size_t index)
 		index);
 }
 
-enum bshell_status bshell_command_begin_processing(bshell_command *command)
+size_t bshell_command_get_arg_count(const bshell_command *cmd)
 {
-	FX_CLASS_DISPATCH_VIRTUAL_0(
+	FX_CLASS_DISPATCH_STATIC_0(
+		BSHELL_TYPE_COMMAND,
+		command_get_arg_count,
+		cmd);
+}
+
+enum bshell_status bshell_command_begin_processing(
+	bshell_command *command,
+	enum bshell_command_position position)
+{
+	FX_CLASS_DISPATCH_VIRTUAL(
 		bshell_command,
 		BSHELL_TYPE_COMMAND,
 		BSHELL_ERR_NOT_SUPPORTED,
 		c_begin_processing,
-		command);
+		command,
+		position);
 }
 
 enum bshell_status bshell_command_process_record(

bshell.runtime/command/function.c

@@ -43,7 +43,9 @@ static enum bshell_status get_callable_name(
 	return BSHELL_SUCCESS;
 }
 
-static enum bshell_status begin_processing(bshell_command *cmd)
+static enum bshell_status begin_processing(
+	bshell_command *cmd,
+	enum bshell_command_position position)
 {
 	return BSHELL_SUCCESS;
 }