updated patch system

pref.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// applyPrefModifications handles `t:pref` type patches
+func applyPrefModifications(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()
+
+	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)
+	modMap := map[string]string{}
+
+	// Prepare the modification map
+	for _, mod := range modifications {
+		if strings.HasPrefix(mod, "+pref") {
+			parts := strings.SplitN(mod, "(", 2)
+			if len(parts) > 1 {
+				key := strings.TrimSpace(parts[0][1:])
+				modMap[key] = strings.TrimSpace(mod)
+			}
+		}
+	}
+
+	modifiedLines := map[string]bool{}
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		// Check if the line matches any modification key
+		lineModified := false
+		for key, replacement := range modMap {
+			if strings.HasPrefix(line, key) && !modifiedLines[key] {
+				fmt.Printf("Replacing line: %s\n", line)
+				if _, err := tempFile.WriteString(replacement + "\n"); err != nil {
+					return fmt.Errorf("failed to write to temp file: %v", err)
+				}
+				modifiedLines[key] = true
+				lineModified = true
+				break
+			}
+		}
+
+		// Write the original line if no modification matches
+		if !lineModified {
+			if _, err := tempFile.WriteString(line + "\n"); err != nil {
+				return fmt.Errorf("failed to write to temp file: %v", err)
+			}
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return fmt.Errorf("failed to read target file: %v", err)
+	}
+
+	// Write remaining modifications (new preferences)
+	for key, replacement := range modMap {
+		if !modifiedLines[key] {
+			if _, err := tempFile.WriteString(replacement + "\n"); err != nil {
+				return fmt.Errorf("failed to write new preference to temp file: %v", err)
+			}
+		}
+	}
+
+	// Replace the original file with the temporary file
+	if err := os.Rename(tempFilePath, targetFilePath); err != nil {
+		return fmt.Errorf("failed to replace target file: %v", err)
+	}
+
+	return nil
+}