refactor: simplify codebase (-209 lines)

internal/fileutil/file.go

@@ -2,6 +2,7 @@ package fileutil
 
 import (
 	"crypto/sha256"
+	"encoding/hex"
 	"fmt"
 	"io"
 	"os"
@@ -18,13 +19,11 @@ func EnsureDir(path string) error {
 	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()
 }
 
@@ -32,7 +31,6 @@ func DeleteFile(path string) error {
 	if !FileExists(path) {
 		return nil
 	}
-
 	return os.Remove(path)
 }
 
@@ -43,10 +41,10 @@ func GetFileHash(path string) (string, error) {
 	}
 	defer file.Close()
 
-	hash := sha256.New()
-	if _, err := io.Copy(hash, file); err != nil {
+	h := sha256.New()
+	if _, err := io.Copy(h, file); err != nil {
 		return "", err
 	}
 
-	return fmt.Sprintf("%x", hash.Sum(nil)), nil
+	return hex.EncodeToString(h.Sum(nil)), nil
 }

internal/fileutil/hashindex.go

@@ -5,6 +5,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
 )
@@ -16,12 +17,11 @@ type HashIndex struct {
 func NewHashIndex(ctx context.Context, root string) (*HashIndex, error) {
 	index := &HashIndex{files: make(map[string]string)}
 
-	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+	err := filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
 		if ctx.Err() != nil {
 			return ctx.Err()
 		}
-
-		if err != nil || info.IsDir() {
+		if err != nil || d.IsDir() {
 			return nil
 		}
 
@@ -36,12 +36,9 @@ func NewHashIndex(ctx context.Context, root string) (*HashIndex, error) {
 			return nil
 		}
 
-		sum := hex.EncodeToString(h.Sum(nil))
-		index.files[sum] = path
-
+		index.files[hex.EncodeToString(h.Sum(nil))] = path
 		return nil
 	})
-
 	if err != nil {
 		return nil, err
 	}
@@ -51,6 +48,5 @@ func NewHashIndex(ctx context.Context, root string) (*HashIndex, error) {
 
 func (h *HashIndex) Find(hash string) (string, bool) {
 	path, ok := h.files[hash]
-
 	return path, ok
 }