141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <X11/Xlib.h>
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#include <stdarg.h>
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#include <stdint.h>
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#define LEN(x) (sizeof(x) / sizeof((x)[0]))
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#define MAXLEN 2048
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char buf[1024];
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static volatile sig_atomic_t done;
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static Display *dpy;
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const unsigned short interval = 1000;
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const char unknown_str[] = "n/a";
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void die(const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
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fputc(' ', stderr);
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perror(NULL);
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} else fputc('\n', stderr);
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va_end(ap);
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exit(1);
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}
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int esnprintf(char *str, size_t size, const char *fmt, ...) {
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = vsnprintf(str, size, fmt, ap);
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if (ret < 0) return -1;
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else if ((size_t)ret >= size) return -1;
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va_end(ap);
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return ret;
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}
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struct arg {
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const char *(*func)(const char *);
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const char *fmt;
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const char *args;
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};
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static void terminate(const int signo) {
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if (signo != SIGUSR1)
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done = 1;
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}
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static void difftimespec(struct timespec *res, struct timespec *a, struct timespec *b) {
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res->tv_sec = a->tv_sec - b->tv_sec - (a->tv_nsec < b->tv_nsec);
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res->tv_nsec = a->tv_nsec - b->tv_nsec + (a->tv_nsec < b->tv_nsec) * 1E9;
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}
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const char* wallpaper_countdown(const char *unused) {
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(void)unused;
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time_t now = time(NULL), last = now;
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FILE *f = fopen("/tmp/last_wallpaper_time", "r");
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if (f) {
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if (fscanf(f, "%ld", &last) != 1) last = now;
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fclose(f);
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}
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int rem = 600 - (int)(now - last);
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if (rem < 0) rem = 0;
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if (snprintf(buf, sizeof(buf), "%02d:%02d", (rem / 60), (rem % 60)) < 0) return NULL;
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return buf;
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}
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const char* run_command(const char *cmd) {
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char *p;
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FILE *fp;
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if (!(fp = popen(cmd, "r"))) return NULL;
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p = fgets(buf, sizeof(buf) - 1, fp);
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if (pclose(fp) < 0) return NULL;
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if (!p) return NULL;
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if ((p = strrchr(buf, '\n'))) p[0] = '\0';
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return buf[0] ? buf : NULL;
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}
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static const struct arg args[] = {
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{ wallpaper_countdown, " %s till swap • ", NULL },
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{ run_command, "VOL at %s • ", "wpctl get-volume @DEFAULT_AUDIO_SINK@ | awk '{printf \"%d%%\", $2 * 100}'" },
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{ run_command, "%s / 731 installed ", "sh -c 'echo $(( ( $(date +%s) - $(stat -c %W /) ) / 86400 ))'" },
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};
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int main(int argc, char *argv[]) {
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struct sigaction act;
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struct timespec start, current, diff, intspec, wait;
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size_t i, len;
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int ret;
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char status[MAXLEN];
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const char *res;
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memset(&act, 0, sizeof(act));
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act.sa_handler = terminate;
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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act.sa_flags |= SA_RESTART;
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sigaction(SIGUSR1, &act, NULL);
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if (!(dpy = XOpenDisplay(NULL)))
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die("XOpenDisplay: Failed to open display");
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do {
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if (clock_gettime(CLOCK_MONOTONIC, &start) < 0) die("clock_gettime:");
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status[0] = '\0';
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for (i = len = 0; i < LEN(args); i++) {
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if (!(res = args[i].func(args[i].args))) res = unknown_str;
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if ((ret = esnprintf(status + len, sizeof(status) - len, args[i].fmt, res)) < 0)
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break;
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len += ret;
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}
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if (XStoreName(dpy, DefaultRootWindow(dpy), status) < 0) die("XStoreName: Allocation failed");
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XFlush(dpy);
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if (!done) {
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if (clock_gettime(CLOCK_MONOTONIC, ¤t) < 0) die("clock_gettime:");
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difftimespec(&diff, ¤t, &start);
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intspec.tv_sec = interval / 1000;
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intspec.tv_nsec = (interval % 1000) * 1E6;
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difftimespec(&wait, &intspec, &diff);
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if (wait.tv_sec >= 0 && nanosleep(&wait, NULL) < 0 && errno != EINTR) die("nanosleep:");
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}
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} while (!done);
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XStoreName(dpy, DefaultRootWindow(dpy), NULL);
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if (XCloseDisplay(dpy) < 0) die("XCloseDisplay: Failed to close display");
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return 0;
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}
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