Disk: add support for Windows

Also major refactoring of util/windows/wmi

src/detection/disk/disk.c

@@ -0,0 +1,55 @@
+#include "fastfetch.h"
+#include "disk.h"
+
+#include <sys/statvfs.h>
+
+void ffDetectDiskWithStatvfs(const char* folderPath, struct statvfs* fs, FFDiskResult* result)
+{
+    ffStrbufInitS(&result->path, folderPath);
+    result->used = result->total = 0;
+    ffStrbufInit(&result->error);
+
+    struct statvfs newFs;
+
+    if(fs == NULL)
+    {
+        fs = &newFs;
+        int ret = statvfs(folderPath, fs);
+        if(ret != 0)
+        {
+            ffStrbufAppendF(&result->error, "statvfs(\"%s\", &fs) != 0 (%i)", folderPath, ret);
+            return;
+        }
+    }
+
+    result->total = fs->f_blocks * fs->f_frsize;
+
+    if(result->total == 0)
+    {
+        ffStrbufAppendF(&result->error, "statvfs for %s returned size 0", folderPath);
+        return;
+    }
+
+    result->used = result->total - (fs->f_bavail * fs->f_frsize);
+    result->files = (uint32_t) (fs->f_files - fs->f_ffree);
+}
+
+bool ffDiskDetectDiskFolders(FFinstance* instance, FFlist* folders)
+{
+    ffStrbufTrim(&instance->config.diskFolders, ':');
+    if(instance->config.diskFolders.length == 0)
+        return false;
+
+    uint32_t startIndex = 0;
+    while(startIndex < instance->config.diskFolders.length)
+    {
+        uint32_t colonIndex = ffStrbufNextIndexC(&instance->config.diskFolders, startIndex, ':');
+        instance->config.diskFolders.chars[colonIndex] = '\0';
+
+        ffDetectDiskWithStatvfs(instance->config.diskFolders.chars + startIndex, NULL, (FFDiskResult*)ffListAdd(folders));
+
+        startIndex = colonIndex + 1;
+    }
+
+    return true;
+}