/* wrapper/plugin-run.c -- run a heiarchy of commands
   system depens: <stdio.h> <stdlib.h>
   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.
*/

#include <stdio.h>
#include <stdlib.h>

#include "rvs.h"
#include "plugins.h"
#include "plugin-find.h"

#include "plugin-run.h"

/* this function is an ugly hack */
char *
_plugin_sh_mktemp()
{
	size_t nbytes = 10;
	char *string = (char *)malloc(nbytes);
	string[0]='\0';
	
	FILE *out=popen("mktemp -t rvs-XXXXXXXXXX","r");
	char c[2]=" \0";
	while ( (c[0]=getc(out)) != '\n' ) {
		stradds(&nbytes,&string,(char *)&c);
	}
	pclose(out);
	return string;
}

void
plugin_run_command(struct plugin_command *command, char *args, char *depfile)
{
	if (command!=NULL) {
		char *outfile=_plugin_sh_mktemp();
		/* make command string:
		  `libexecdir/plugin_name/command < depfile > outfile'
		*/
		int nbytes=20;
		char *coms=(char *)xmalloc(nbytes);
		coms[0]='\0';
		stradds(&nbytes,&coms,libexecdir);
		stradds(&nbytes,&coms,"/");
		stradds(&nbytes,&coms,command->plugin->name);
		stradds(&nbytes,&coms,"/");
		stradds(&nbytes,&coms,command->name);
		stradds(&nbytes,&coms," ");
		stradds(&nbytes,&coms,args);
		stradds(&nbytes,&coms," < ");
		stradds(&nbytes,&coms,depfile);
		stradds(&nbytes,&coms," > ");
		stradds(&nbytes,&coms,outfile);
		
		xsystem(coms);
		xfree(coms);
		plugin_run_command(command->d_child,args,outfile);
		xfree(outfile);
		plugin_run_command(command->d_next ,args,depfile);
	}
}

/* needs to take the root command */
void
plugin_run(struct plugin_command *command,char *args)
{
	/*plugin_run_command(command->d_child,"/dev/null");*/
	char *outfile=_plugin_sh_mktemp();
	plugin_run_command(command->d_child,args,outfile);
	xfree(outfile);
}