added windows compatibility

standard.go

@@ -7,89 +7,96 @@ import (
 	"strings"
 )
 
-// applyStandardModifications applies standard modifications
+// applyStandardModifications handles `standard` type patches
 func applyStandardModifications(targetFilePath string, modifications []string) error {
-	// Open the target file
-	targetFile, err := os.Open(targetFilePath)
-	if err != nil {
-		return fmt.Errorf("failed to open target file: %v", err)
-	}
-	defer targetFile.Close()
+	fmt.Printf("Applying standard modifications to file: %s\n", targetFilePath)
 
-	// Prepare a temporary file for output
-	tempFilePath := targetFilePath + ".tmp"
-	tempFile, err := os.Create(tempFilePath)
+	// Open the target file for reading and writing
+	file, err := os.OpenFile(targetFilePath, os.O_RDWR, 0644)
 	if err != nil {
-		return fmt.Errorf("failed to create temp file: %v", err)
+		return fmt.Errorf("failed to open target file '%s': %v", targetFilePath, err)
 	}
-	defer tempFile.Close()
+	defer file.Close()
 
-	scanner := bufio.NewScanner(targetFile)
-	var targetLines []string
+	scanner := bufio.NewScanner(file)
+	targetLines := []string{}
+
+	// Read all lines from the target file
 	for scanner.Scan() {
 		targetLines = append(targetLines, scanner.Text())
 	}
-
 	if err := scanner.Err(); err != nil {
-		return fmt.Errorf("failed to read target file: %v", err)
+		return fmt.Errorf("failed to read target file '%s': %v", targetFilePath, err)
 	}
 
-	// Apply the modifications
-	updatedLines, err := applyModifications(targetLines, modifications)
-	if err != nil {
-		return err
-	}
+	modifiedLines := map[string]bool{}
+	modMap := parseModifications(modifications)
 
-	// Write the updated lines to the temporary file
-	for _, line := range updatedLines {
-		_, err := fmt.Fprintln(tempFile, line)
-		if err != nil {
-			return fmt.Errorf("failed to write to temp file: %v", err)
+	var updatedContent strings.Builder
+
+	// Apply modifications to the target lines
+	for _, line := range targetLines {
+		lineModified := false
+
+		for key, mod := range modMap {
+			if strings.Contains(line, key) && !modifiedLines[key] {
+				fmt.Printf("Replacing line in file '%s': %s -> %s\n", targetFilePath, line, mod)
+				updatedContent.WriteString(mod + "\n")
+				modifiedLines[key] = true
+				lineModified = true
+				break
+			}
+		}
+
+		// Write the original line if no modification matches
+		if !lineModified {
+			updatedContent.WriteString(line + "\n")
 		}
 	}
 
-	// Replace the original file with the updated file
-	err = os.Rename(tempFilePath, targetFilePath)
-	if err != nil {
-		return fmt.Errorf("failed to replace target file: %v", err)
+	// Append any remaining modifications that were not applied
+	for key, mod := range modMap {
+		if !modifiedLines[key] {
+			fmt.Printf("Adding new line to file '%s': %s\n", targetFilePath, mod)
+			updatedContent.WriteString(mod + "\n")
+		}
 	}
 
+	// Truncate and rewrite the file with updated content
+	if err := file.Truncate(0); err != nil {
+		return fmt.Errorf("failed to truncate file '%s': %v", targetFilePath, err)
+	}
+	if _, err := file.Seek(0, 0); err != nil {
+		return fmt.Errorf("failed to reset file pointer for '%s': %v", targetFilePath, err)
+	}
+	if _, err := file.WriteString(updatedContent.String()); err != nil {
+		return fmt.Errorf("failed to write updated content to file '%s': %v", targetFilePath, err)
+	}
+
+	fmt.Printf("Standard modifications successfully applied to file: %s\n", targetFilePath)
 	return nil
 }
 
-// applyModifications applies the changes from the patch file to the target lines
-func applyModifications(targetLines, modifications []string) ([]string, error) {
-	var result []string
-	i := 0
-
+// parseModifications converts a list of modification strings into a map for processing
+func parseModifications(modifications []string) map[string]string {
+	modMap := map[string]string{}
 	for _, mod := range modifications {
-		switch {
-		case strings.HasPrefix(mod, "-"): // Delete or replace
-			mod = strings.TrimPrefix(mod, "-")
-			for i < len(targetLines) {
-				if strings.TrimSpace(targetLines[i]) == strings.TrimSpace(mod) {
-					i++ // Skip this line (delete)
-					break
-				}
-				result = append(result, targetLines[i])
-				i++
-			}
-		case strings.HasPrefix(mod, "+"): // Add or replace
-			mod = strings.TrimPrefix(mod, "+")
-			result = append(result, mod)
-		default: // Keep existing lines
-			if i < len(targetLines) {
-				result = append(result, targetLines[i])
-				i++
-			}
+		if strings.HasPrefix(mod, "+") || strings.HasPrefix(mod, "-") {
+			trimmed := strings.TrimSpace(strings.TrimPrefix(mod, "+"))
+			trimmed = strings.TrimPrefix(trimmed, "-")
+			key := extractKey(trimmed)
+			modMap[key] = trimmed
 		}
 	}
-
-	// Append remaining lines from the original file
-	for i < len(targetLines) {
-		result = append(result, targetLines[i])
-		i++
-	}
-
-	return result, nil
+	return modMap
+}
+
+// extractKey extracts the key from a modification string
+func extractKey(line string) string {
+	start := strings.Index(line, "(")
+	end := strings.LastIndex(line, ")")
+	if start > 0 && end > start {
+		return strings.TrimSpace(line[start+1 : end])
+	}
+	return line // Fallback: return the full line
 }