feat: initial commit — unarr CLI

Search, inspect, stream, and download torrents from the terminal.
Replaces the entire *arr stack with a single binary.

internal/agent/disk_windows.go

@@ -0,0 +1,31 @@
+//go:build windows
+
+package agent
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// DiskInfo returns free and total bytes for the filesystem containing path.
+func DiskInfo(path string) (freeBytes, totalBytes int64, err error) {
+	kernel32 := syscall.NewLazyDLL("kernel32.dll")
+	getDiskFreeSpaceEx := kernel32.NewProc("GetDiskFreeSpaceExW")
+
+	pathPtr, err := syscall.UTF16PtrFromString(path)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	var freeBytesAvailable, totalNumberOfBytes uint64
+	r1, _, e1 := getDiskFreeSpaceEx.Call(
+		uintptr(unsafe.Pointer(pathPtr)),
+		uintptr(unsafe.Pointer(&freeBytesAvailable)),
+		uintptr(unsafe.Pointer(&totalNumberOfBytes)),
+		0,
+	)
+	if r1 == 0 {
+		return 0, 0, e1
+	}
+	return int64(freeBytesAvailable), int64(totalNumberOfBytes), nil
+}