first commit

README.md

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+#### installation
+
+```
+make
+```
+```
+sudo make install
+```
+
+#### usage
+
+```
+countdown 20
+```
+
+#### uninstalling
+
+```
+sudo make uninstall
+```
+
+#### TODO
+
+- allow countdowns to be longer than 60 minutes

main.c

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+// to make it work for times bigger than 60 minutes this has to be extended
+
+#include "play_raw_audio.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+
+// debug pulse audio problems
+#define PA_DEBUG 0
+
+int main(int argc, char **argv) {
+	int countdown_min_total;
+	char *HOME = getenv("HOME");
+	char *audio_file = "";
+	if (HOME != NULL) {
+		audio_file = strcat(HOME, "/music/alarm-clock-elapsed.wav");
+	} else {
+		printf ("Can't find environment variable HOME!\n");
+		return 1;
+	}
+
+	if (argc > 1) {
+		countdown_min_total = atoi(argv[1]);
+	} else {
+		if (PA_DEBUG) {
+			countdown_min_total = 0;
+		} else {
+			puts ("Define your countdown length in minutes!");
+			scanf ("%d", &countdown_min_total);
+		}
+	}
+
+	int countdown_sec_total = countdown_min_total * 60;
+
+	int countdown_sec;
+	int countdown_min;
+
+	write(1, "\033c", 3);
+
+	while (countdown_sec_total > 0) {
+		if (countdown_sec_total >= 60) {
+			countdown_sec = countdown_sec_total % 60;
+			countdown_min = (countdown_sec_total - countdown_sec) / 60;
+		} else {
+			countdown_sec = countdown_sec_total;
+			countdown_min = 0;
+		}
+
+		write(1, "\033c", 3);
+
+		printf ("%02d:%02d", countdown_min, countdown_sec);
+		fflush(stdout);
+		printf ("\r");
+
+		sleep(1);
+		countdown_sec_total--;
+	}
+
+	printf ("THE TIME IS UP!\n");
+	play_raw_audio(audio_file);
+
+	return 0;
+}

makefile

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+.PHONY:all
+all:
+	gcc -Wall *.c -lpulse-simple
+
+.PHONY:run
+run:
+	clear
+	gcc -Wall *.c -lpulse-simple
+	./a.out
+
+.PHONY:debug
+debug:
+	gcc -Wall -g *.c -lpulse-simple
+	gdb a.out
+
+.PHONY:install
+install:
+	cp a.out /usr/local/bin/countdown
+
+.PHONY:uninstall
+uninstall:
+	rm /usr/local/bin/countdown

play_raw_audio.c

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+// install libpulse-dev or libpulse package depending on your distro
+// compile: gcc -Wall play_raw_audio_file.c -lpulse-simple
+
+#include "play_raw_audio.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pulse/simple.h>
+#include <pulse/error.h>
+
+int play_raw_audio(char file_name[]) {
+	int pa_error = 0;
+    char content[1024] = "";
+
+    int myfd = open(file_name, O_RDONLY);
+	if (myfd == -1) {
+		perror("Failed to open audio file");
+		return 1;
+	}
+
+    pa_simple* simple = NULL;
+    pa_sample_spec ss;
+    ss.format = PA_SAMPLE_S16LE;
+    ss.rate = 48000;
+    ss.channels = 2;
+
+    // Temporarily redirect stderr to /dev/null
+	// because pulseaudio prints to stderr even though it does not set any error codes
+	FILE *original_stderr = stderr;
+	stderr = fopen("/dev/null", "w");
+
+    simple = pa_simple_new(NULL, "Audio Playback", PA_STREAM_PLAYBACK, NULL, "playback", &ss, NULL, NULL, &pa_error);
+
+	// Restore stderr
+	stderr = original_stderr;
+
+    int i = 0;
+    while (read(myfd, content, sizeof(content))) {
+      // skip the first 1024 bytes to not play the file header
+      if (i != 0) {
+		pa_simple_write(simple, content, sizeof(content), &pa_error);
+      }
+      i++;
+    }
+
+    pa_simple_drain(simple, NULL);
+
+    pa_simple_free(simple);
+
+    close(myfd);
+
+    return 0;
+}
+

play_raw_audio.h

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+// install libpulse-dev or libpulse package depending on your distro
+// compile: gcc -Wall play_raw_audio_file.c -lpulse-simple
+
+#pragma once
+
+int play_raw_audio(char file_name[]);