refactor: major project restructure

internal/fileutil/file.go

@@ -0,0 +1,52 @@
+package fileutil
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"os"
+)
+
+func EnsureDir(path string) error {
+	info, err := os.Stat(path)
+	if os.IsNotExist(err) {
+		return os.MkdirAll(path, 0755)
+	}
+	if err != nil {
+		return err
+	}
+	if !info.IsDir() {
+		return fmt.Errorf("file already exists at %s", path)
+	}
+
+	return nil
+}
+
+func FileExists(path string) bool {
+	info, err := os.Stat(path)
+
+	return err == nil && !info.IsDir()
+}
+
+func DeleteFile(path string) error {
+	if !FileExists(path) {
+		return nil
+	}
+
+	return os.Remove(path)
+}
+
+func GetFileHash(path string) (string, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+
+	hash := sha256.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf("%x", hash.Sum(nil)), nil
+}