shithub: rssfill

ref: 1f438d08785b7946c612d016dbf6940c9614c26a
dir: /rssfill.c/

#include <u.h>
#include <libc.h>
#include <bio.h>
#include "xmlpull.h"
#include "rssfill.h"
#include "date.h"

char  *directory = "/lib/news";
char  *prefix = "";

int chatty = 0;
int dry = 0;

void
usage(void)
{
	fprint(2, "usage: %s "
		"[ -ct ] "
		"[ -p prefix ] "
		"[ -d directory ]\n", argv0);
	exits("usage");
}

void
writefeedfiles(Feed *f)
{
	int fd;
	char file[1024];
	long d;
	Dir dir;
	
	if(f != nil){
		while(f->n != nil)
			f = f->n;

		while(f != nil){
			if(f->s == 2){
				d = parsedate(f->date);
				snprint(file, 1023, "%s/%s%ld", directory, prefix, d);
				
				fd = create(file, OWRITE, 0666);
				if(!fd)
					sysfatal("error creating file %s: %r", file);
				
				if(chatty)
					fprint(2, "writing file %s\n", file);
				
				if(dry){
					f = f->p;
					continue;
				}
				if(f->title != nil)
					fprint(fd, "title:   %s\n", f->title);
				if(f->date != nil)
					fprint(fd, "pubDate: %s (%ld)\n", f->date, d);
				if(f->link != nil)
					fprint(fd, "link:    %s\n", f->link);
				if(f->desc != nil)
					fprint(fd, "\n%s\n", f->desc);
				
				nulldir(&dir);
				dir.mtime = d;
				dirfwstat(fd, &dir);
				
				close(fd);
			}
			f = f->p;
		}
	}
}

void
freefeed(Feed *f)
{
	if(f != nil){
		if(f->title != nil)
			free(f->title);
		if(f->link != nil)
			free(f->link);
		if(f->desc != nil)
			free(f->desc);
		if(f->date != nil)
			free(f->date);
		free(f);
	}
	return;
}

void
freefeedt(Feed *r)
{
	while(r != nil){
		if(r->n != nil){
			r = r->n;
			freefeed(r->p);
		} else {
			freefeed(r);
			r = nil;
		}
	}
}

Feed *
searchfeed(Feed *r, char *title, char *link, char *desc, char *date)
{
	while(r != nil){
		if(r->title != nil && title != nil){
			if(!strcmp(r->title, title)){
				r->s = 1;
				return r;
			}
		}
		if(r->link != nil && link != nil){
			if(!strcmp(r->link, link)){
				r->s = 1;
				return r;
			}
		}
		if(r->desc != nil && desc != nil){
			if(!strcmp(r->desc, desc)){
				r->s = 1;
				return r;
			}
		}
		if(r->date != nil && date != nil){
			if(!strcmp(r->date, date)){
				r->s = 1;
				return r;
			}
		}
		r = r->n;
	}
	return nil;
}

Feed *
addfeed(Feed *r, Feed *f)
{
	Feed *ret;

	ret = r;
	f->s = 2;
	if(r != nil) {
		while(r->n != nil)
			r = r->n;
	} else
		return f;
	r->n = f;
	f->p = r;

	return ret;
}

Feed *
removefeed(Feed *r, Feed *f)
{
	if(f->n != nil && f->p != nil){
		f->n->p = f->p;
		f->p->n = f->n;
	} else {
		if(f->n != nil){
			f->n->p = nil;
			r = f->n;
		}
		if(f->p != nil)
			f->p->n = nil;
	}
	freefeed(f);

	return r;
}

Feed *
checkfeed(Feed *r)
{
	Feed *a;

	a = r;

	while(a != nil){
		if(a->s == 0)
			r = removefeed(r, a);
		else
			a->s = 0;
		a = a->n;
	}

	return r;
}

void
main(int argc, char **argv)
{
	xmlpull *x, *a;
	char st;
	Feed *f, *r;
	
	ARGBEGIN {
	case 'd':
		directory = EARGF(usage());
		break;
	case 'p':
		prefix = EARGF(usage());
		break;
	case 't':
		dry = 1;
		break;
	case 'c':
		chatty = 1;
		break;
	} ARGEND;
	
	if(dry)
		chatty = 1;
	
	st = NONE;
	f = nil;
	r = nil;
	
	x = openxmlpull(0);
	while((a = nextxmlpull(x)) != nil && st != END){
		switch(a->ev){
		case START_DOCUMENT:
			break;
		case START_TAG:
			if(!strcmp(x->na, "item") || !strcmp(x->na, "entry")){
				if(f != nil)
					freefeed(f);
				f = mallocz(sizeof(Feed), 2);
				st = ITEM;
				break;
			}
			if(!strcmp(x->na, "title") && st == ITEM){
				st = TITLE;
				break;
			}
			if(!strcmp(x->na, "description") && st == ITEM){
				st = DESC;
				break;
			}
			if(!strcmp(x->na, "link") && st == ITEM){
				st = LINK;
				break;
			}
			if(!strcmp(x->na, "pubDate") && st == ITEM){
				st = DATE;
				break;
			}
			if(!strcmp(x->na, "updated") && st == ITEM){
				st = DATE;
				break;
			}
			break;
		case START_END_TAG:
			break;
		case ATTR:
			if(!strcmp(x->na, "href") && st == LINK)
				f->link = strdup(x->va);
			break;
		case TEXT:
			switch(st){
			case TITLE:
				f->title = strdup(x->na);
				break;
			case LINK:
				f->link = strdup(x->na);
				break;
			case DESC:
				f->desc = strdup(x->na);
				break;
			case DATE:
				f->date = strdup(x->na);
				break;
			default:
				break;
			}
			break;
		case END_TAG:
			if((!strcmp(x->na, "item") || !strcmp(x->na, "entry")) && st == ITEM){
				if(searchfeed(r, f->title, f->link, f->desc, f->date) == nil){
					r = addfeed(r, f);
					f = nil;
				} else {
					freefeed(f);
					f = nil;
				}
							
				st = NONE;
				break;
			}
			if(!strcmp(x->na, "title") && st == TITLE){
				st = ITEM;
				break;
			}
			if(!strcmp(x->na, "link") && st == LINK){
				st = ITEM;
				break;
			}
			if(!strcmp(x->na, "description") && st == DESC){
				st = ITEM;
				break;
			}
			if(!strcmp(x->na, "pubDate") && st == DATE){
				st = ITEM;
				break;
			}
			if(!strcmp(x->na, "updated") && st == DATE){
				st = ITEM;
				break;
			}
			if(!strcmp(x->na, "rdf:RDF") || !strcmp(x->na, "items")
					|| !strcmp(x->na, "rss") || !strcmp(x->na, "feed")){
				writefeedfiles(r);
				r = checkfeed(r);
				break;
			}
			break;
		case END_DOCUMENT:
			st = END;
			break;
		default:
			sysfatal("Error, should never happen: %x", x->ev);
			break;
		}
	}
	freexmlpull(x);
	freefeedt(r);
	exits(nil);
}