1 files changed, 95 insertions, 0 deletions
diff --git a/timer.c b/timer.c
new file mode 100644
index 0000000..58757d7
--- /dev/null
+++ b/timer.c
@@ -0,0 +1,95 @@
+#include "timer.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/timerfd.h>
+#include <sys/eventfd.h>
+#include <poll.h>
+
+void timer_init(Timer *t, size_t sec) {
+  assert(t != NULL);
+  t->seconds = sec;
+  t->remaining_seconds = sec;
+  t->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+  if(t->timerfd == -1) {
+    fprintf(stdout, "Error: timerfd could not be created!");
+    exit(1);
+  }
+}
+
+void timer_reset(Timer *t) {
+  assert(t != NULL);
+  struct itimerspec spec = {0};
+  timerfd_settime(t->timerfd, 0, &spec, NULL);
+  t->remaining_seconds = t->seconds;
+  size_t mins = t->remaining_seconds / 60;
+  size_t secs = t->remaining_seconds % 60;
+  fprintf(stdout, "{\"text\": \"Paused %02d:%02d\"}\n", mins, secs);
+  fflush(stdout);
+}
+
+void timer_start(Timer *t) {
+  assert(t != NULL);
+  t->status = T_RUNNING;
+  struct itimerspec spec;
+  spec.it_interval.tv_sec = 1;
+  spec.it_interval.tv_nsec = 0;
+  spec.it_value.tv_sec = 1;
+  spec.it_value.tv_nsec = 0;
+  timerfd_settime(t->timerfd, 0, &spec, NULL);
+}
+
+void timer_stop(Timer *t) {
+  assert(t != NULL);
+  t->status = T_STOPPED;
+  struct itimerspec spec = {0};
+  timerfd_settime(t->timerfd, 0, &spec, NULL);
+}
+
+void timer_toggle_state(Timer *t) {
+  assert(t != NULL);
+  if(t->status == T_RUNNING)
+    timer_stop(t);
+  else if (t->status == T_STOPPED)
+    timer_start(t);
+}
+
+void timer_loop(Timer *t) { // May drift by a couple mili-seconds. However, just a pomodoro app, so that is not important.
+  assert(t != NULL);
+
+  t->remaining_seconds = t->seconds;
+  size_t mins = t->remaining_seconds / 60;
+  size_t secs = t->remaining_seconds % 60;
+  fprintf(stdout, "{\"text\": \"Paused %02d:%02d\"}\n", mins, secs);
+  fflush(stdout);
+
+  struct pollfd fds;
+  fds.fd = t->timerfd;
+  fds.events = POLLIN;
+
+  while (1) {
+    if(poll(&fds, 1, -1) == -1) {
+      printf("Failed to poll events!");
+      exit(1);
+    }
+
+    if(fds.revents & POLLIN) {
+      uint64_t tick;
+      read(t->timerfd, &tick, sizeof(tick));
+      if(t->remaining_seconds == 0) {
+	fprintf(stdout,"{\"text\": \"Completed\"}\n");
+	uint64_t buf;
+	timer_stop(t);
+      } else {
+	t->remaining_seconds--;
+	size_t mins = t->remaining_seconds / 60;
+	size_t secs = t->remaining_seconds % 60;
+	fprintf(stdout,"{\"text\": \"Work %02d:%02d\"}\n", mins, secs);
+      }
+      fflush(stdout);
+    }
+  }
+}