diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 39a704a..46baccf 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,4 +1,4 @@
 Contributing
 ============
 
-If you want to contribute, please use [the suckless coding style](http://suckless.org/coding_style) and 4 spaces for indentation.
+If you want to contribute, please use [the suckless coding style](http://suckless.org/coding_style).
diff --git a/README.md b/README.md
index 8e3002d..555a6b8 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ Put the following code in your ~/.xinitrc (or similar):
 
 ```
 while true; do
-    slstatus
+	slstatus
 done &
 ```
 
diff --git a/config.def.h b/config.def.h
index 5576936..39215e2 100644
--- a/config.def.h
+++ b/config.def.h
@@ -1,12 +1,12 @@
 /* See LICENSE file for copyright and license details. */
 
 /* alsa sound */
-static const char channel[]   = "Master";
+static const char channel[]         = "Master";
 
 /* battery */
-static const char batterypath[] = "/sys/class/power_supply/";
-static const char batterynow[]  = "energy_now";
-static const char batteryfull[] = "energy_full_design";
+static const char batterypath[]     = "/sys/class/power_supply/";
+static const char batterynow[]      = "energy_now";
+static const char batteryfull[]     = "energy_full_design";
 
 /* bar update interval in seconds (smallest value = 1) */
 static unsigned int update_interval = 1;
@@ -35,13 +35,13 @@ static unsigned int update_interval = 1;
 - wifi_perc (wifi signal in percent) [argument: wifi card interface name]
 - wifi_essid (wifi essid) [argument: wifi card interface name] */
 static const struct arg args[] = {
-    /* function     format          argument */
-    { wifi_perc,    "wifi %4s | ",  "wlp3s0" },
-    { battery_perc, "bat %4s | ",   "BAT0" },
-    { cpu_perc,     "cpu %4s ",     NULL },
-    { temp,         "%3s | ",       "/sys/devices/platform/coretemp.0/hwmon/hwmon2/temp1_input" },
-    { ram_perc,     "ram %3s | ",   NULL },
-    { vol_perc,     "vol %4s | ",   "default" },
-    { disk_perc,    "ssd %3s | ",   "/" },
-    { datetime,     "%s",           "%y-%m-%d %H:%M:%S" },
+	/* function     format          argument */
+	{ wifi_perc,    "wifi %4s | ",  "wlp3s0" },
+	{ battery_perc, "bat %4s | ",   "BAT0" },
+	{ cpu_perc,     "cpu %4s ",     NULL },
+	{ temp,         "%3s | ",       "/sys/devices/platform/coretemp.0/hwmon/hwmon2/temp1_input" },
+	{ ram_perc,     "ram %3s | ",   NULL },
+	{ vol_perc,     "vol %4s | ",   "default" },
+	{ disk_perc,    "ssd %3s | ",   "/" },
+	{ datetime,     "%s",           "%y-%m-%d %H:%M:%S" },
 };
diff --git a/slstatus.c b/slstatus.c
index 2f0fe20..08bbebb 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -31,457 +31,455 @@
 void
 setstatus(const char *str)
 {
-    /* set WM_NAME via X11 */
-    XStoreName(dpy, DefaultRootWindow(dpy), str);
-    XSync(dpy, False);
+	/* set WM_NAME via X11 */
+	XStoreName(dpy, DefaultRootWindow(dpy), str);
+	XSync(dpy, False);
 }
 
 /* smprintf function */
 char *
 smprintf(const char *fmt, ...)
 {
-    va_list fmtargs;
-    char *ret = NULL;
+	va_list fmtargs;
+	char *ret = NULL;
 
-    va_start(fmtargs, fmt);
-    if (vasprintf(&ret, fmt, fmtargs) < 0)
-        return NULL;
-    va_end(fmtargs);
+	va_start(fmtargs, fmt);
+	if (vasprintf(&ret, fmt, fmtargs) < 0) {
+		return NULL;
+	}
+	va_end(fmtargs);
 
-    return ret;
+	return ret;
 }
 
 /* battery percentage */
 char *
 battery_perc(const char *battery)
 {
-    int now, full, perc;
-    char batterynowfile[64] = "";
-    char batteryfullfile[64] = "";
-    FILE *fp;
+	int now, full, perc;
+	char batterynowfile[64] = "";
+	char batteryfullfile[64] = "";
+	FILE *fp;
 
-    /* generate battery nowfile path */
-    strcat(batterynowfile, batterypath);
-    strcat(batterynowfile, battery);
-    strcat(batterynowfile, "/");
-    strcat(batterynowfile, batterynow);
+	/* generate battery nowfile path */
+	strcat(batterynowfile, batterypath);
+	strcat(batterynowfile, battery);
+	strcat(batterynowfile, "/");
+	strcat(batterynowfile, batterynow);
 
-    /* generate battery fullfile path */
-    strcat(batteryfullfile, batterypath);
-    strcat(batteryfullfile, battery);
-    strcat(batteryfullfile, "/");
-    strcat(batteryfullfile, batteryfull);
+	/* generate battery fullfile path */
+	strcat(batteryfullfile, batterypath);
+	strcat(batteryfullfile, battery);
+	strcat(batteryfullfile, "/");
+	strcat(batteryfullfile, batteryfull);
 
-    /* open battery now file */
-    if (!(fp = fopen(batterynowfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.%s",batterynowfile);
-        return smprintf("n/a");
-    }
+	/* open battery now file */
+	if (!(fp = fopen(batterynowfile, "r"))) {
+		fprintf(stderr, "Error opening battery file.%s", batterynowfile);
+		return smprintf("n/a");
+	}
 
-    /* read value */
-    fscanf(fp, "%i", &now);
+	/* read value */
+	fscanf(fp, "%i", &now);
 
-    /* close battery now file */
-    fclose(fp);
+	/* close battery now file */
+	fclose(fp);
 
-    /* open battery full file */
-    if (!(fp = fopen(batteryfullfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        return smprintf("n/a");
-    }
+	/* open battery full file */
+	if (!(fp = fopen(batteryfullfile, "r"))) {
+		fprintf(stderr, "Error opening battery file.");
+		return smprintf("n/a");
+	}
 
-    /* read value */
-    fscanf(fp, "%i", &full);
+	/* read value */
+	fscanf(fp, "%i", &full);
 
-    /* close battery full file */
-    fclose(fp);
+	/* close battery full file */
+	fclose(fp);
 
-    /* calculate percent */
-    perc = now / (full / 100);
+	/* calculate percent */
+	perc = now / (full / 100);
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+	/* return perc as string */
+	return smprintf("%d%%", perc);
 }
 
 /* cpu percentage */
 char *
 cpu_perc(const char *null)
 {
-    int perc;
-    long double a[4], b[4];
-    FILE *fp;
+	int perc;
+	long double a[4], b[4];
+	FILE *fp;
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+	/* open stat file */
+	if (!(fp = fopen("/proc/stat","r"))) {
+		fprintf(stderr, "Error opening stat file.");
+		return smprintf("n/a");
+	}
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+	/* read values */
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 
-    /* close stat file */
-    fclose(fp);
+	/* close stat file */
+	fclose(fp);
 
-    /* wait a second (for avg values) */
-    sleep(1);
+	/* wait a second (for avg values) */
+	sleep(1);
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+	/* open stat file */
+	if (!(fp = fopen("/proc/stat","r"))) {
+		fprintf(stderr, "Error opening stat file.");
+		return smprintf("n/a");
+	}
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+	/* read values */
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 
-    /* close stat file */
-    fclose(fp);
+	/* close stat file */
+	fclose(fp);
 
-    /* calculate avg in this second */
-    perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
+	/* calculate avg in this second */
+	perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+	/* return perc as string */
+	return smprintf("%d%%", perc);
 }
 
 /* date and time */
 char *
 datetime(const char *timeformat)
 {
-    time_t tm;
-    size_t bufsize = 64;
-    char *buf = malloc(bufsize);
-    if (buf == NULL) {
-        fprintf(stderr, "Failed to get date/time");
-        return smprintf("n/a");
-    }
+	time_t tm;
+	size_t bufsize = 64;
+	char *buf = malloc(bufsize);
+	if (buf == NULL) {
+		fprintf(stderr, "Failed to get date/time");
+		return smprintf("n/a");
+	}
 
-    /* get time in format */
-    time(&tm);
-    setlocale(LC_TIME, "");
-    if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
-        setlocale(LC_TIME, "C");
-        free(buf);
-        fprintf(stderr, "Strftime failed.\n");
-        return smprintf("n/a");
-    }
+	/* get time in format */
+	time(&tm);
+	setlocale(LC_TIME, "");
+	if (!strftime(buf, bufsize, timeformat, localtime(&tm))) {
+		setlocale(LC_TIME, "C");
+		free(buf);
+		fprintf(stderr, "Strftime failed.\n");
+		return smprintf("n/a");
+	}
 
-    setlocale(LC_TIME, "C");
-    /* return time */
-    char *ret = smprintf("%s", buf);
-    free(buf);
-    return ret;
+	setlocale(LC_TIME, "C");
+	/* return time */
+	char *ret = smprintf("%s", buf);
+	free(buf);
+	return ret;
 }
 
 /* disk free */
 char *
 disk_free(const char *mountpoint)
 {
-    struct statvfs fs;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* return free */
-    return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+	/* return free */
+	return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 }
 
 /* disk usage percentage */
 char *
 disk_perc(const char *mountpoint)
 {
-    int perc = 0;
-    struct statvfs fs;
+	int perc = 0;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* calculate percent */
-    perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
+	/* calculate percent */
+	perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 
-    /* return perc */
-    return smprintf("%d%%", perc);
+	/* return perc */
+	return smprintf("%d%%", perc);
 }
 
 /* disk total */
 char *
 disk_total(const char *mountpoint)
 {
-    struct statvfs fs;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* return total */
-    return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
+	/* return total */
+	return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 }
 
 /* disk used */
 char *
 disk_used(const char *mountpoint)
 {
-    struct statvfs fs;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* return used */
-    return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+	/* return used */
+	return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 }
 
 /* entropy available */
 char *
 entropy(const char *null)
 {
-    int entropy = 0;
-    FILE *fp;
+	int entropy = 0;
+	FILE *fp;
 
-    /* open entropy file */
-    if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
-        fprintf(stderr, "Could not open entropy file.\n");
-        return smprintf("n/a");
-    }
+	/* open entropy file */
+	if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
+		fprintf(stderr, "Could not open entropy file.\n");
+		return smprintf("n/a");
+	}
 
-    /* extract entropy */
-    fscanf(fp, "%d", &entropy);
+	/* extract entropy */
+	fscanf(fp, "%d", &entropy);
 
-    /* close entropy file */
-    fclose(fp);
+	/* close entropy file */
+	fclose(fp);
 
-    /* return entropy */
-    return smprintf("%d", entropy);
+	/* return entropy */
+	return smprintf("%d", entropy);
 }
 
 /* gid */
 char *
 gid(const char *null)
 {
-    gid_t gid;
+	gid_t gid;
 
-    if ((gid = getgid()) < 0) {
-        fprintf(stderr, "Could no get gid.");
-        return smprintf("n/a");
-    } else {
-        return smprintf("%d", gid);
-    }
+	if ((gid = getgid()) < 0) {
+		fprintf(stderr, "Could no get gid.");
+		return smprintf("n/a");
+	} else {
+		return smprintf("%d", gid);
+	}
 
-    return smprintf("n/a");
+	return smprintf("n/a");
 }
 
 /* hostname */
 char *
 hostname(const char *null)
 {
-    char hostname[HOST_NAME_MAX];
-    FILE *fp;
+	char hostname[HOST_NAME_MAX];
+	FILE *fp;
 
-    /* open hostname file */
-    if (!(fp = fopen("/proc/sys/kernel/hostname", "r"))) {
-        fprintf(stderr, "Could not open hostname file.\n");
-        return smprintf("n/a");
-    }
+	/* open hostname file */
+	if (!(fp = fopen("/proc/sys/kernel/hostname", "r"))) {
+		fprintf(stderr, "Could not open hostname file.\n");
+		return smprintf("n/a");
+	}
 
-    /* extract hostname */
-    fscanf(fp, "%s\n", hostname);
+	/* extract hostname */
+	fscanf(fp, "%s\n", hostname);
 
-    /* close hostname file */
-    fclose(fp);
+	/* close hostname file */
+	fclose(fp);
 
-    /* return entropy */
-    return smprintf("%s", hostname);
+	/* return entropy */
+	return smprintf("%s", hostname);
 }
 
 /* ip address */
 char *
 ip(const char *interface)
 {
-    struct ifaddrs *ifaddr, *ifa;
-    int s;
-    char host[NI_MAXHOST];
+	struct ifaddrs *ifaddr, *ifa;
+	int s;
+	char host[NI_MAXHOST];
 
-    /* check if getting ip address works */
-    if (getifaddrs(&ifaddr) == -1)
-    {
-        fprintf(stderr, "Error getting IP address.");
-        return smprintf("n/a");
-    }
+	/* check if getting ip address works */
+	if (getifaddrs(&ifaddr) == -1) {
+		fprintf(stderr, "Error getting IP address.");
+		return smprintf("n/a");
+	}
 
-    /* get the ip address */
-    for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
-    {
-        if (ifa->ifa_addr == NULL)
-            continue;
+	/* get the ip address */
+	for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+		if (ifa->ifa_addr == NULL) {
+			continue;
+		}
 
-        s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+		s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 
-        if ((strcmp(ifa->ifa_name, interface) == 0) && (ifa->ifa_addr->sa_family == AF_INET))
-        {
-            if (s != 0)
-            {
-                fprintf(stderr, "Error getting IP address.");
-                return smprintf("n/a");
-            }
-            return smprintf("%s", host);
-        }
-    }
+		if ((strcmp(ifa->ifa_name, interface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
+			if (s != 0) {
+				fprintf(stderr, "Error getting IP address.");
+				return smprintf("n/a");
+			}
+			return smprintf("%s", host);
+		}
+	}
 
-    /* free the address */
-    freeifaddrs(ifaddr);
+	/* free the address */
+	freeifaddrs(ifaddr);
 
-    /* return n/a if nothing works */
-    return smprintf("n/a");
+	/* return n/a if nothing works */
+	return smprintf("n/a");
 }
 
 /* ram free */
 char *
 ram_free(const char *null)
 {
-    long free;
-    FILE *fp;
+	long free;
+	FILE *fp;
 
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
+	/* open meminfo file */
+	if (!(fp = fopen("/proc/meminfo", "r"))) {
+		fprintf(stderr, "Error opening meminfo file.");
+		return smprintf("n/a");
+	}
 
-    /* read the values */
-    fscanf(fp, "MemFree: %ld kB\n", &free);
+	/* read the values */
+	fscanf(fp, "MemFree: %ld kB\n", &free);
 
-    /* close meminfo file */
-    fclose(fp);
+	/* close meminfo file */
+	fclose(fp);
 
-    /* return free ram as string */
-    return smprintf("%f", (float)free / 1024 / 1024);
+	/* return free ram as string */
+	return smprintf("%f", (float)free / 1024 / 1024);
 }
 
 /* ram percentage */
 char *
 ram_perc(const char *null)
 {
-    int perc;
-    long total, free, buffers, cached;
-    FILE *fp;
+	int perc;
+	long total, free, buffers, cached;
+	FILE *fp;
 
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
+	/* open meminfo file */
+	if (!(fp = fopen("/proc/meminfo", "r"))) {
+		fprintf(stderr, "Error opening meminfo file.");
+		return smprintf("n/a");
+	}
 
-    /* read the values */
-    fscanf(fp, "MemTotal: %ld kB\n", &total);
-    fscanf(fp, "MemFree: %ld kB\n", &free);
-    fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
-    fscanf(fp, "Cached: %ld kB\n", &cached);
+	/* read the values */
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
+	fscanf(fp, "Cached: %ld kB\n", &cached);
 
-    /* close meminfo file */
-    fclose(fp);
+	/* close meminfo file */
+	fclose(fp);
 
-    /* calculate percentage */
-    perc = 100 * ((total - free) - (buffers + cached)) / total;
+	/* calculate percentage */
+	perc = 100 * ((total - free) - (buffers + cached)) / total;
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+	/* return perc as string */
+	return smprintf("%d%%", perc);
 }
 
 /* ram total */
 char *
 ram_total(const char *null)
 {
-    long total;
-    FILE *fp;
+	long total;
+	FILE *fp;
 
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
+	/* open meminfo file */
+	if (!(fp = fopen("/proc/meminfo", "r"))) {
+		fprintf(stderr, "Error opening meminfo file.");
+		return smprintf("n/a");
+	}
 
-    /* read the values */
-    fscanf(fp, "MemTotal: %ld kB\n", &total);
+	/* read the values */
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
 
-    /* close meminfo file */
-    fclose(fp);
+	/* close meminfo file */
+	fclose(fp);
 
-    /* return total ram as string */
-    return smprintf("%f", (float)total / 1024 / 1024);
+	/* return total ram as string */
+	return smprintf("%f", (float)total / 1024 / 1024);
 }
 
 /* ram used */
 char *
 ram_used(const char *null)
 {
-    long free, total, buffers, cached, used;
-    FILE *fp;
+	long free, total, buffers, cached, used;
+	FILE *fp;
 
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
+	/* open meminfo file */
+	if (!(fp = fopen("/proc/meminfo", "r"))) {
+		fprintf(stderr, "Error opening meminfo file.");
+		return smprintf("n/a");
+	}
 
-    /* read the values */
-    fscanf(fp, "MemTotal: %ld kB\n", &total);
-    fscanf(fp, "MemFree: %ld kB\n", &free);
-    fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
-    fscanf(fp, "Cached: %ld kB\n", &cached);
+	/* read the values */
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
+	fscanf(fp, "Cached: %ld kB\n", &cached);
 
-    /* close meminfo file */
-    fclose(fp);
+	/* close meminfo file */
+	fclose(fp);
 
-    /* calculate used */
-    used = total - free - buffers - cached;
+	/* calculate used */
+	used = total - free - buffers - cached;
 
-    /* return used ram as string */
-    return smprintf("%f", (float)used / 1024 / 1024);
+	/* return used ram as string */
+	return smprintf("%f", (float)used / 1024 / 1024);
 }
 
 /* custom shell command */
 char *
 run_command(const char* command)
 {
-    int good;
+	int good;
 	FILE *fp;
 	char buffer[64];
 
-    /* try to open the command output */
+	/* try to open the command output */
 	if (!(fp = popen(command, "r"))) {
-        fprintf(stderr, "Could not get command output for: %s.\n", command);
-        return smprintf("n/a");
-    }
+		fprintf(stderr, "Could not get command output for: %s.\n", command);
+		return smprintf("n/a");
+	}
 
-    /* get command output text, save it to buffer */
-	fgets(buffer, sizeof(buffer)-1, fp);
+	/* get command output text, save it to buffer */
+	fgets(buffer, sizeof(buffer) - 1, fp);
 
-    /* close it again */
+	/* close it again */
 	pclose(fp);
 
-    /* add nullchar at the end */
-    for (int i = 0 ; i != sizeof(buffer) ; i++) {
-        if (buffer[i] == '\0') {
-            good = 1;
-            break;
-        }
-    }
-    if (good) {
-        buffer[strlen(buffer) - 1] = '\0';
-    }
+	/* add nullchar at the end */
+	for (int i = 0 ; i != sizeof(buffer); i++) {
+		if (buffer[i] == '\0') {
+			good = 1;
+			break;
+		}
+	}
+	if (good) {
+		buffer[strlen(buffer) - 1] = '\0';
+	}
 
-    /* return the output */
+	/* return the output */
 	return smprintf("%s", buffer);
 }
 
@@ -489,67 +487,65 @@ run_command(const char* command)
 char *
 temp(const char *file)
 {
-    int temperature;
-    FILE *fp;
+	int temperature;
+	FILE *fp;
 
-    /* open temperature file */
-    if (!(fp = fopen(file, "r"))) {
-        fprintf(stderr, "Could not open temperature file.\n");
-        return smprintf("n/a");
-    }
+	/* open temperature file */
+	if (!(fp = fopen(file, "r"))) {
+		fprintf(stderr, "Could not open temperature file.\n");
+		return smprintf("n/a");
+	}
 
-    /* extract temperature */
-    fscanf(fp, "%d", &temperature);
+	/* extract temperature */
+	fscanf(fp, "%d", &temperature);
 
-    /* close temperature file */
-    fclose(fp);
+	/* close temperature file */
+	fclose(fp);
 
-    /* return temperature in degrees */
-    return smprintf("%d°C", temperature / 1000);
+	/* return temperature in degrees */
+	return smprintf("%d°C", temperature / 1000);
 }
 
 /* username */
 char *
 username(const char *null)
 {
-    register struct passwd *pw;
-    register uid_t uid;
+	register struct passwd *pw;
+	register uid_t uid;
 
-    /* get the values */
-    uid = geteuid ();
-    pw = getpwuid (uid);
+	/* get the values */
+	uid = geteuid();
+	pw = getpwuid(uid);
 
-    /* if it worked, return */
-    if (pw) {
-        return smprintf("%s", pw->pw_name);
-    }
-    else {
-        fprintf(stderr, "Could not get username.\n");
-        return smprintf("n/a");
-    }
+	/* if it worked, return */
+	if (pw) {
+		return smprintf("%s", pw->pw_name);
+	} else {
+		fprintf(stderr, "Could not get username.\n");
+		return smprintf("n/a");
+	}
 
-    return smprintf("n/a");
+	return smprintf("n/a");
 }
 
 /* uid */
 char *
 uid(const char *null)
 {
-    register uid_t uid;
+	register uid_t uid;
 
-    /* get the values */
-    uid = geteuid ();
+	/* get the values */
+	uid = geteuid();
 
-    /* if it worked, return */
-    if (uid) {
-        return smprintf("%d", uid);
-    }
-    else {
-        fprintf(stderr, "Could not get uid.\n");
-        return smprintf("n/a");
-    }
+	/* if it worked, return */
+	if (uid) {
+		return smprintf("%d", uid);
+	} else {
+		fprintf(stderr, "Could not get uid.\n");
+		return smprintf("n/a");
+	}
 
-    return smprintf("n/a");
+	return smprintf("n/a");
 }
 
 
@@ -557,193 +553,191 @@ uid(const char *null)
 char *
 vol_perc(const char *soundcard)
 {
-    int mute = 0;
-    long vol = 0, max = 0, min = 0;
-    snd_mixer_t *handle;
-    snd_mixer_elem_t *pcm_mixer, *mas_mixer;
-    snd_mixer_selem_id_t *vol_info, *mute_info;
+	int mute = 0;
+	long vol = 0, max = 0, min = 0;
+	snd_mixer_t *handle;
+	snd_mixer_elem_t *pcm_mixer, *mas_mixer;
+	snd_mixer_selem_id_t *vol_info, *mute_info;
 
-    /* open everything */
-    snd_mixer_open(&handle, 0);
-    snd_mixer_attach(handle, soundcard);
-    snd_mixer_selem_register(handle, NULL, NULL);
-    snd_mixer_load(handle);
+	/* open everything */
+	snd_mixer_open(&handle, 0);
+	snd_mixer_attach(handle, soundcard);
+	snd_mixer_selem_register(handle, NULL, NULL);
+	snd_mixer_load(handle);
 
-    /* prepare everything */
-    snd_mixer_selem_id_malloc(&vol_info);
-    snd_mixer_selem_id_malloc(&mute_info);
-    /* check */
-    if (vol_info == NULL || mute_info == NULL) {
-        fprintf(stderr, "Could not get alsa volume");
-        return smprintf("n/a");
-    }
-    snd_mixer_selem_id_set_name(vol_info, channel);
-    snd_mixer_selem_id_set_name(mute_info, channel);
-    pcm_mixer = snd_mixer_find_selem(handle, vol_info);
-    mas_mixer = snd_mixer_find_selem(handle, mute_info);
+	/* prepare everything */
+	snd_mixer_selem_id_malloc(&vol_info);
+	snd_mixer_selem_id_malloc(&mute_info);
+	/* check */
+	if (vol_info == NULL || mute_info == NULL) {
+		fprintf(stderr, "Could not get alsa volume");
+		return smprintf("n/a");
+	}
+	snd_mixer_selem_id_set_name(vol_info, channel);
+	snd_mixer_selem_id_set_name(mute_info, channel);
+	pcm_mixer = snd_mixer_find_selem(handle, vol_info);
+	mas_mixer = snd_mixer_find_selem(handle, mute_info);
 
-    /* get the info */
-    snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
-    snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
-    snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
+	/* get the info */
+	snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
+	snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
+	snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
 
-    /* clean up */
-    if (vol_info) {
-        snd_mixer_selem_id_free(vol_info);
-    }
-    if (mute_info) {
-        snd_mixer_selem_id_free(mute_info);
-    }
-    if (handle) {
-        snd_mixer_close(handle);
-    }
+	/* clean up */
+	if (vol_info) {
+		snd_mixer_selem_id_free(vol_info);
+	}
+	if (mute_info) {
+		snd_mixer_selem_id_free(mute_info);
+	}
+	if (handle) {
+		snd_mixer_close(handle);
+	}
 
-    /* return the string (mute) */
-    if (!mute) {
-        return smprintf("mute");
-    }
-    else {
-        return smprintf("%d%%", (vol * 100) / max);
-    }
+	/* return the string (mute) */
+	if (!mute) {
+		return smprintf("mute");
+	} else {
+		return smprintf("%d%%", (vol * 100) / max);
+	}
 }
 
 /* wifi percentage */
 char *
 wifi_perc(const char *wificard)
 {
-    int bufsize = 255;
-    int strength;
-    char buf[bufsize];
-    char *datastart;
-    char path[64];
-    char status[5];
-    char needle[sizeof wificard + 1];
-    FILE *fp;
+	int bufsize = 255;
+	int strength;
+	char buf[bufsize];
+	char *datastart;
+	char path[64];
+	char status[5];
+	char needle[sizeof wificard + 1];
+	FILE *fp;
 
-    /* generate the path name */
-    memset(path, 0, sizeof path);
-    strcat(path, "/sys/class/net/");
-    strcat(path, wificard);
-    strcat(path, "/operstate");
+	/* generate the path name */
+	memset(path, 0, sizeof path);
+	strcat(path, "/sys/class/net/");
+	strcat(path, wificard);
+	strcat(path, "/operstate");
 
-    /* open wifi file */
-    if(!(fp = fopen(path, "r"))) {
-        fprintf(stderr, "Error opening wifi operstate file.");
-        return smprintf("n/a");
-    }
+	/* open wifi file */
+	if(!(fp = fopen(path, "r"))) {
+		fprintf(stderr, "Error opening wifi operstate file.");
+		return smprintf("n/a");
+	}
 
-    /* read the status */
-    fgets(status, 5, fp);
+	/* read the status */
+	fgets(status, 5, fp);
 
-    /* close wifi file */
-    fclose(fp);
+	/* close wifi file */
+	fclose(fp);
 
-    /* check if interface down */
-    if(strcmp(status, "up\n") != 0){
-        return smprintf("n/a");
-    }
+	/* check if interface down */
+	if(strcmp(status, "up\n") != 0) {
+		return smprintf("n/a");
+	}
 
-    /* open wifi file */
-    if (!(fp = fopen("/proc/net/wireless", "r"))) {
-        fprintf(stderr, "Error opening wireless file.");
-        return smprintf("n/a");
-    }
+	/* open wifi file */
+	if (!(fp = fopen("/proc/net/wireless", "r"))) {
+		fprintf(stderr, "Error opening wireless file.");
+		return smprintf("n/a");
+	}
 
-    /* extract the signal strength */
-    strcpy(needle, wificard);
-    strcat(needle, ":");
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    if ((datastart = strstr(buf, needle)) != NULL) {
-        datastart = strstr(buf, ":");
-        sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
-    }
+	/* extract the signal strength */
+	strcpy(needle, wificard);
+	strcat(needle, ":");
+	fgets(buf, bufsize, fp);
+	fgets(buf, bufsize, fp);
+	fgets(buf, bufsize, fp);
+	if ((datastart = strstr(buf, needle)) != NULL) {
+		datastart = strstr(buf, ":");
+		sscanf(datastart + 1, " %*d   %d  %*d  %*d		  %*d	   %*d		%*d		 %*d	  %*d		 %*d", &strength);
+	}
 
-    /* close wifi file */
-    fclose(fp);
+	/* close wifi file */
+	fclose(fp);
 
-    /* return strength in percent */
-    return smprintf("%d%%", strength);
+	/* return strength in percent */
+	return smprintf("%d%%", strength);
 }
 
 /* wifi essid */
 char *
 wifi_essid(const char *wificard)
 {
-    char id[IW_ESSID_MAX_SIZE+1];
-    int sockfd;
-    struct iwreq wreq;
+	char id[IW_ESSID_MAX_SIZE+1];
+	int sockfd;
+	struct iwreq wreq;
 
-    /* prepare */
-    memset(&wreq, 0, sizeof(struct iwreq));
-    wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
+	/* prepare */
+	memset(&wreq, 0, sizeof(struct iwreq));
+	wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 
-    /* set the interface */
-    sprintf(wreq.ifr_name, wificard);
+	/* set the interface */
+	sprintf(wreq.ifr_name, wificard);
 
-    /* check */
-    if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
-        fprintf(stderr, "Cannot open socket for interface: %s\n", wificard);
-        return smprintf("n/a");
-    }
-    wreq.u.essid.pointer = id;
-    if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
-        fprintf(stderr, "Get ESSID ioctl failed for interface %s\n", wificard);
-        return smprintf("n/a");
-    }
+	/* check */
+	if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+		fprintf(stderr, "Cannot open socket for interface: %s\n", wificard);
+		return smprintf("n/a");
+	}
+	wreq.u.essid.pointer = id;
+	if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
+		fprintf(stderr, "Get ESSID ioctl failed for interface %s\n", wificard);
+		return smprintf("n/a");
+	}
 
-    /* return the essid */
-    if (strcmp((char *)wreq.u.essid.pointer, "") == 0) {
-        return smprintf("n/a");
-    }
-    else {
-        return smprintf("%s", (char *)wreq.u.essid.pointer);
-    }
+	/* return the essid */
+	if (strcmp((char *)wreq.u.essid.pointer, "") == 0) {
+		return smprintf("n/a");
+	} else {
+		return smprintf("%s", (char *)wreq.u.essid.pointer);
+	}
 }
 
 /* main function */
 int
 main(void)
 {
-    char status_string[1024];
-    struct arg argument;
+	char status_string[1024];
+	struct arg argument;
 
-    /* try to open display */
-    if (!(dpy = XOpenDisplay(0x0))) {
-        fprintf(stderr, "Cannot open display!\n");
-        exit(1);
-    }
+	/* try to open display */
+	if (!(dpy = XOpenDisplay(0x0))) {
+		fprintf(stderr, "Cannot open display!\n");
+		exit(1);
+	}
 
-    /* return status every interval */
-    for (;;) {
-        /* clear the string */
-        memset(status_string, 0, sizeof(status_string));
+	/* return status every interval */
+	for (;;) {
+		/* clear the string */
+		memset(status_string, 0, sizeof(status_string));
 
-        /* generate status_string */
-        for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
-            argument = args[i];
-            char *res = argument.func(argument.args);
-            char *element = smprintf(argument.format, res);
-            if (element == NULL) {
-                element = smprintf("n/a");
-                fprintf(stderr, "Failed to format output.");
-            }
-            strcat(status_string, element);
-            free(res);
-            free(element);
-        }
+		/* generate status_string */
+		for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
+			argument = args[i];
+			char *res = argument.func(argument.args);
+			char *element = smprintf(argument.format, res);
+			if (element == NULL) {
+				element = smprintf("n/a");
+				fprintf(stderr, "Failed to format output.");
+			}
+			strcat(status_string, element);
+			free(res);
+			free(element);
+		}
 
-        /* return the statusbar */
-        setstatus(status_string);
+		/* return the statusbar */
+		setstatus(status_string);
 
-        /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
-        sleep(update_interval -1);
-    }
+		/* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
+		sleep(update_interval -1);
+	}
 
-    /* close display */
-    XCloseDisplay(dpy);
+	/* close display */
+	XCloseDisplay(dpy);
 
-    /* exit successfully */
-    return 0;
+	/* exit successfully */
+	return 0;
 }
diff --git a/slstatus.h b/slstatus.h
index 7d0d887..f09b3bc 100644
--- a/slstatus.h
+++ b/slstatus.h
@@ -6,9 +6,9 @@ static Display *dpy;
 /* statusbar configuration type and struct */
 typedef char *(*op_fun) (const char *);
 struct arg {
-    op_fun func;
-    const char *format;
-    const char *args;
+	op_fun func;
+	const char *format;
+	const char *args;
 };
 
 /* functions */