/* 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    1. A user enters a username and passwthat 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.
*/

#include <stdio.h>
#include <unistd.h>
#include <string.h>

#include <errno.h>
#include <error.h>

#include "rvs.h"
#include "plugin.h"

void _parse_comment (FILE *file)
{
	char c;
	while ( (c=getc(file)) != EOF ) {
		if ( c == '\n' ) {
			ungetc (c, file);
			break;
		}
	}
}

char _parse_escape(FILE *file)
{
	char c=getc(file);
	switch (c) {
		case 'n':
			c = '\n';
		case '\\':
		case '#':
		case ':':
			break;
		default:
			error(EXIT_FAILURE,0,"syntax error");
			break;
	}
	return c;
}

char *_parse_depend (FILE *file)
{
	int nbytes = 10;
	char *string = (char *) malloc(nbytes);
	
	char c[2] = " \0";
	char *cs = &c;
	while ( (c[0]=getc(file)) != EOF ) {
		if (c[0] == '\n') {
			printf("%s | ",string);/* FIXME: DEBUG message */
			ungetc (c[0], file);
			break;
		} else {
			switch (c[0]) {
				case '\\':
					c[0]=_parse_escape(file);
					stradds(&nbytes,&string,cs);
					break;
				case '#':
					_parse_comment(file);
					break;
				default:
					stradds(&nbytes,&string,cs);
					break;
			}
		}
	}
	return string;
}

struct plugin_command *_parse_plugin (struct plugin *plugin, FILE *file)
{
	struct plugin_command *command;
	int nbytes = 10;
	char *string = (char *) malloc(nbytes);
	
	char c[2] = " \0";
	char *cs = &c;
	while ( (c[0]=getc(file)) != EOF ) {
		if (c[0] == '\n') {
			printf("%s\n",string);/* FIXME: debug code */
			command->p_next=_parse_plugin(plugin, file);
			break;
		} else {
			switch (c[0]) {
				case '\\':
					c[0]=_parse_escape(file);
					stradds(&nbytes,&string,cs);
					break;
				case '#':
					_parse_comment(file);
					break;
				case ':':
					_parse_depend(file);
					break;
				default:
					stradds(&nbytes,&string,cs);
					break;
			}
		}
	}
	return command;
}

struct plugin *load_plugin (char *plug_name, char *plugin_conf)
{
	printf("loading plugin `%s'\n",plug_name);
	struct plugin *plugin;
	plugin->name=plug_name;
	
	chdir(plug_name);
	FILE *file = xfopen(plugin_conf,"r");
	
	plugin->child=_parse_plugin(&plugin, file);
	
	fclose( file );
	chdir("..");
	return plugin;
}