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#include <sys/stat.h>
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tree.h"
#include "util.h"
static char *line;
static size_t linesize;
static int changed, firsttime = 1;
static time_t comparetime;
struct line {
char *id;
char *link;
char *title;
time_t timestamp;
RB_ENTRY(line) entry;
};
int
linecmp(struct line *e1, struct line *e2)
{
int r;
if ((r = strcmp(e1->id, e2->id)))
return r;
else if ((r = strcmp(e1->title, e2->title)))
return r;
return strcmp(e1->link, e2->link);
}
RB_HEAD(linetree, line) head = RB_INITIALIZER(&head);
RB_GENERATE_STATIC(linetree, line, entry, linecmp)
/* remove old entries from the tree that won't be shown anyway. */
static void
gc(void)
{
struct line *line, *tmp;
RB_FOREACH_SAFE(line, linetree, &head, tmp) {
if (line->timestamp < comparetime) {
free(line->id);
free(line->link);
free(line->title);
RB_REMOVE(linetree, &head, line);
free(line);
}
}
}
static void
printfeed(FILE *fp, const char *feedname)
{
struct line *add, search;
char *fields[FieldLast];
ssize_t linelen;
time_t parsedtime;
struct tm *tm;
while ((linelen = getline(&line, &linesize, fp)) > 0) {
if (line[linelen - 1] == '\n')
line[--linelen] = '\0';
if (!parseline(line, fields))
break;
parsedtime = 0;
if (strtotime(fields[FieldUnixTimestamp], &parsedtime))
continue;
if (!(tm = localtime(&parsedtime)))
err(1, "localtime");
/* old news: skip */
if (parsedtime < comparetime)
continue;
search.id = fields[FieldId];
search.link = fields[FieldLink];
search.title = fields[FieldTitle];
search.timestamp = parsedtime;
if (RB_FIND(linetree, &head, &search))
continue;
changed = 1;
if (!(add = calloc(1, sizeof(*add))))
err(1, "calloc");
if (!(add->id = strdup(fields[FieldId])))
err(1, "strdup");
if (!(add->link = strdup(fields[FieldLink])))
err(1, "strdup");
if (!(add->title = strdup(fields[FieldTitle])))
err(1, "strdup");
add->timestamp = parsedtime;
RB_INSERT(linetree, &head, add);
if (feedname[0]) {
printutf8pad(stdout, feedname, 15, ' ');
fputs(" ", stdout);
}
fprintf(stdout, "%04d-%02d-%02d %02d:%02d ",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min);
printutf8pad(stdout, fields[FieldTitle], 70, ' ');
printf(" %s\n", fields[FieldLink]);
}
}
int
main(int argc, char *argv[])
{
struct stat *stfiles, st;
char *name;
FILE *fp;
int i, slept = 0;
if (pledge("stdio rpath", NULL) == -1)
err(1, "pledge");
if (argc <= 1) {
fprintf(stderr, "usage: %s <file>...\n", argv[0]);
return 1;
}
setlocale(LC_CTYPE, "");
if (!(stfiles = calloc(argc - 1, sizeof(*stfiles))))
err(1, "calloc");
while (1) {
changed = 0;
if ((comparetime = time(NULL)) == -1)
err(1, "time");
/* 1 day is old news */
comparetime -= 86400;
for (i = 1; i < argc; i++) {
if (!(fp = fopen(argv[i], "r"))) {
if (firsttime)
err(1, "fopen: %s", argv[i]);
/* don't report when the file is missing after the first run */
continue;
}
if (fstat(fileno(fp), &st) == -1) {
if (firsttime)
err(1, "fstat: %s", argv[i]);
warn("fstat: %s", argv[i]);
fclose(fp);
continue;
}
/* did the file change? by size, modification */
if (stfiles[i - 1].st_size != st.st_size ||
stfiles[i - 1].st_mtime != st.st_mtime) {
name = ((name = strrchr(argv[i], '/'))) ? name + 1 : argv[i];
printfeed(fp, name);
if (ferror(fp))
warn("ferror: %s", argv[i]);
memcpy(&stfiles[i - 1], &st, sizeof(st));
}
fclose(fp);
}
/* "garbage collect" on a change or every 5 minutes */
if (changed || slept > 300) {
gc();
changed = 0;
slept = 0;
}
sleep(1);
slept++;
firsttime = 0;
}
return 0;
}
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