add sb-battery

Makefile

@@ -2,7 +2,7 @@ CC = cc
 CFLAGS = -Wall -Wextra -O3
 CURL_LIBS = -lcurl
 
-SOURCES = sb-cpu.c sb-date.c sb-memory.c sb-time.c sb-weather.c
+SOURCES = sb-cpu.c sb-date.c sb-memory.c sb-time.c sb-weather.c sb-battery.c
 
 EXECUTABLES = $(SOURCES:.c=)
 
@@ -23,6 +23,9 @@ sb-memory: sb-memory.c
 sb-time: sb-time.c
 	$(CC) $(CFLAGS) $< -o $@
 
+sb-battery: sb-battery.c
+	$(CC) $(CFLAGS) $< -o $@
+
 clean:
 	rm -f $(EXECUTABLES)
 

README.md

@@ -12,4 +12,6 @@ $ ./sb-time
 10:10am
 $ ./sb-date
 Jul 10 2025
+$ ./sb-battery 
+Bat: +98%
 ```

sb-battery.c

@@ -0,0 +1,52 @@
+#include <dirent.h>
+#include <stdio.h>
+#include <string.h>
+
+int main() {
+  DIR *dir = opendir("/sys/class/power_supply");
+  if (!dir)
+    return 1;
+
+  struct dirent *entry;
+  int total = 0, count = 0, charging = 0;
+
+  // Iterate every battery
+  while ((entry = readdir(dir))) {
+    if (strncmp(entry->d_name, "BAT", 3) != 0)
+      continue;
+
+    char path[512];
+    FILE *fp;
+    int capacity;
+    char status[20];
+
+    // Read current charge value
+    snprintf(path, sizeof(path), "/sys/class/power_supply/%s/capacity",
+             entry->d_name);
+    fp = fopen(path, "r");
+    if (!fp)
+      return 1;
+    if (fscanf(fp, "%d", &capacity) == 1) {
+      total += capacity;
+      count++;
+      fclose(fp);
+    }
+
+    // Check if charging
+    snprintf(path, sizeof(path), "/sys/class/power_supply/%s/status",
+             entry->d_name);
+    fp = fopen(path, "r");
+    if (!fp)
+      return 1;
+    if (fscanf(fp, "%19s", status) == 1) {
+      if (strncmp(status, "Charging", 8) == 0)
+        charging = 1;
+      fclose(fp);
+    }
+  }
+  closedir(dir);
+
+  if (count > 0)
+    printf("Bat: %s%d%%\n", charging ? "+" : "", total / count);
+  return 0;
+}