updated patch system

standard.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// applyStandardModifications applies standard modifications
+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()
+
+	// Prepare a temporary file for output
+	tempFilePath := targetFilePath + ".tmp"
+	tempFile, err := os.Create(tempFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to create temp file: %v", err)
+	}
+	defer tempFile.Close()
+
+	scanner := bufio.NewScanner(targetFile)
+	var targetLines []string
+	for scanner.Scan() {
+		targetLines = append(targetLines, scanner.Text())
+	}
+
+	if err := scanner.Err(); err != nil {
+		return fmt.Errorf("failed to read target file: %v", err)
+	}
+
+	// Apply the modifications
+	updatedLines, err := applyModifications(targetLines, modifications)
+	if err != nil {
+		return err
+	}
+
+	// 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)
+		}
+	}
+
+	// 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)
+	}
+
+	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
+
+	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++
+			}
+		}
+	}
+
+	// Append remaining lines from the original file
+	for i < len(targetLines) {
+		result = append(result, targetLines[i])
+		i++
+	}
+
+	return result, nil
+}