/* Copyright (C) 2009 Luke Shumaker
   
   This file is part of rvs.
   
   rvs is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your
   option) any later version.
   
   rvs is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with rvs; see the file COPYING.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef FILE_plugin-depend.c_SEEN
#define FILE_plugin-depend.c_SEEN

/* translates a string in syntax `plugin/command' into a pointer to the commnad
   DON'T plan on using the string again, it will be mutilated!
    (so we go ahead and free() it)                                           */
struct plugin_command *
_plugin_depend_parse(struct plugin *root, char *string)
{
	char *c=strchr(string,'/');
	c[0]='\0';
	return _plugin_find_command(
		_plugin_find_plugin(root,string)->child,
		&c[1]);
	xfree(string);
}

/* used by _plugin_depend_add */
void
_plugin_depend_add2(struct plugin_command *prev, struct plugin_command *next)
{
	if (prev->d_next==NULL) {
		prev->d_next=next;
	} else {
		_plugin_depend_add2(prev->d_next,next);
	}
}

/* _plugin_depend_add(depend,depender) */
void
_plugin_depend_add(struct plugin_command *depend, struct plugin_command *depender)
{
	if (depend->child==NULL) {
		depend->child=depender;
	} else {
		_plugin_depend_add2(depend->child,depender);
	}
}

/* take care of depends for `command', and those after it (linked list) */
void
_plugin_depend_command(struct plugin_command *command, struct plugin_tree *tree)
{
	if (command->depends == NULL) {
		command->depend=tree->depends;
	} else {
		command->depend=_plugin_depend_parse(tree->plugins,command->depends);
		command->depends=NULL;
	}
	_plugin_depend_add(command->depend,command);
	if (command->p_next != NULL)
		_plugin_depend_command(command->p_next,tree);
}

/* take care of commands for a `plugin', and those after it (linked list) */
void
_plugin_depend_plugin(struct plugin *plugin, struct plugin_tree *tree)
{
	_plugin_depend_command(plugin->child,tree);
	if (plugin->next != NULL) {
		_plugin_depend_plugin(plugin->next,tree);
	}
}

/* take care of all depends */
void
_plugin_depend(struct plugin_tree *tree)
{
	/* add a blank `root' command for those that don't have depends */
	struct plugin_command *command;
	command=(struct plugin_command *)xmalloc(sizeof(*command));
	command->name=NULL;
	command->plugin=NULL;
	command->p_next=NULL;
	command->depend=NULL;
	command->depends=NULL;
	command->child=NULL;/*<--only variable of any value */
	command->d_next=NULL;
	
	tree->depends=command;
	
	/* parse all commands */
	_plugin_depend_plugin(tree->plugins,tree);
}

#endif