Battery (Haiku): add stub file

CMakeLists.txt

@@ -1123,7 +1123,7 @@ elseif(Haiku)
         src/common/netif/netif_haiku.c
         src/common/networking_linux.c
         src/common/processing_linux.c
-        src/detection/battery/battery_nosupport.c
+        src/detection/battery/battery_haiku.c
         src/detection/bios/bios_nosupport.c
         src/detection/board/board_nosupport.c
         src/detection/bootmgr/bootmgr_nosupport.c

src/detection/battery/battery_haiku.c

@@ -0,0 +1,31 @@
+#include "fastfetch.h"
+#include "battery.h"
+#include "common/io/io.h"
+#include "util/stringUtils.h"
+
+void parseBattery(FFstrbuf* content, FFlist* results)
+{
+    char* line = NULL;
+    size_t n = 0;
+    while (ffStrbufGetline(&line, &n, content))
+    {
+
+    }
+}
+
+const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results)
+{
+    FF_AUTO_CLOSE_DIR DIR* dir = opendir("/dev/power/acpi_battery/");
+    if (!dir) return "opendir(/dev/power/acpi_battery) failed";
+
+    FF_STRBUF_AUTO_DESTROY content = ffStrbufCreate();
+    struct dirent* entry;
+    while ((entry = readdir(dir)))
+    {
+        if (entry->d_name[0] == '.') continue;
+        if (!ffReadFileBufferRelative(dirfd(dir), entry->d_name, &content)) continue;
+        parseBattery(&content, results);
+    }
+
+    return "To be supported";
+}