Add tests

main.go

@@ -111,26 +111,29 @@ end
 
 	// Process each file
 	for _, file := range files {
-		err := processFile(file, pattern, fullScript)
+		log.Printf("Processing file: %s", file)
+		fullPath := filepath.Join(".", file)
+
+		content, err := os.ReadFile(fullPath)
+		if err != nil {
+			Error.Printf("error reading file: %v", err)
+			continue
+		}
+
+		fileContent := string(content)
+		result, err := process(fileContent, pattern, fullScript)
 		if err != nil {
 			Error.Printf("Error processing file %s: %v", file, err)
 		}
+
+		err = os.WriteFile(fullPath, []byte(result), 0644)
+		if err != nil {
+			Error.Printf("error writing file: %v", err)
+		}
 	}
 }
 
-func processFile(filename string, pattern *regexp.Regexp, luaScript string) error {
+func process(data string, pattern *regexp.Regexp, luaScript string) (string, error) {
-	log.Printf("Processing file: %s", filename)
-	fullPath := filepath.Join(".", filename)
-
-	content, err := os.ReadFile(fullPath)
-	if err != nil {
-		return fmt.Errorf("error reading file: %v", err)
-	}
-
-	fileContent := string(content)
-	modified := false
-
-	// Initialize Lua state once per file
 	L := lua.NewState()
 	defer L.Close()
 
@@ -138,16 +141,16 @@ func processFile(filename string, pattern *regexp.Regexp, luaScript string) erro
 	L.Push(L.GetGlobal("require"))
 	L.Push(lua.LString("math"))
 	if err := L.PCall(1, 1, nil); err != nil {
-		return fmt.Errorf("error loading Lua math library: %v", err)
+		return data, fmt.Errorf("error loading Lua math library: %v", err)
 	}
 
 	// Load the Lua script
 	if err := L.DoString(luaScript); err != nil {
-		return fmt.Errorf("error in Lua script: %v", err)
+		return data, fmt.Errorf("error in Lua script: %v", err)
 	}
 
 	// Process all regex matches
-	result := pattern.ReplaceAllStringFunc(fileContent, func(match string) string {
+	result := pattern.ReplaceAllStringFunc(data, func(match string) string {
 		captures := pattern.FindStringSubmatch(match)
 		if len(captures) <= 1 {
 			// No capture groups, return unchanged
@@ -200,7 +203,6 @@ func processFile(filename string, pattern *regexp.Regexp, luaScript string) erro
 				// Replace old value with new value
 				result = strings.Replace(result, oldVal, newVal, 1)
 			}
-			modified = true
 			return result
 		}
 
@@ -208,16 +210,5 @@ func processFile(filename string, pattern *regexp.Regexp, luaScript string) erro
 		return match
 	})
 
-	// Only write if changes were made
+	return result, nil
-	if modified {
-		err = os.WriteFile(fullPath, []byte(result), 0644)
-		if err != nil {
-			return fmt.Errorf("error writing file: %v", err)
-		}
-		log.Printf("File %s updated successfully", filename)
-	} else {
-		log.Printf("No changes made to %s", filename)
-	}
-
-	return nil
 }

main_test.go

@@ -0,0 +1,204 @@
+package main
+
+import (
+	"regexp"
+	"testing"
+)
+
+func TestSimpleFileSimpleExpression(t *testing.T) {
+	fileContents := `
+		<config>
+			<item>
+				<value>100</value>
+			</item>
+		</config>
+	`
+	expected := `
+		<config>
+			<item>
+				<value>150</value>
+			</item>
+		</config>
+	`
+
+	regex := regexp.MustCompile(`<value>(\d+)</value>`)
+	luaExpr := `*1.5`
+
+	modifiedContent, err := process(fileContents, regex, luaExpr)
+	if err != nil {
+		t.Fatalf("Error processing file: %v", err)
+	}
+
+	if modifiedContent != expected {
+		t.Fatalf("Expected modified content to be %v, but got %v", expected, modifiedContent)
+	}
+}
+
+func TestSimpleFileVExpression(t *testing.T) {
+	fileContents := `
+		<config>
+			<item>
+				<value>100</value>
+			</item>
+		</config>
+	`
+	expected := `
+		<config>
+			<item>
+				<value>150</value>
+			</item>
+		</config>
+	`
+
+	regex := regexp.MustCompile(`<value>(\d+)</value>`)
+	luaExpr := `v1 * 1.5`
+
+	modifiedContent, err := process(fileContents, regex, luaExpr)
+	if err != nil {
+		t.Fatalf("Error processing file: %v", err)
+	}
+
+	if modifiedContent != expected {
+		t.Fatalf("Expected modified content to be %v, but got %v", expected, modifiedContent)
+	}
+}
+
+func TestSimpleFileTableVExpression(t *testing.T) {
+	fileContents := `
+		<config>
+			<item>
+				<value>100</value>
+			</item>
+		</config>
+	`
+	expected := `
+		<config>
+			<item>
+				<value>150</value>
+			</item>
+		</config>
+	`
+
+	regex := regexp.MustCompile(`<value>(\d+)</value>`)
+	luaExpr := `v[1] * 1.5`
+
+	modifiedContent, err := process(fileContents, regex, luaExpr)
+	if err != nil {
+		t.Fatalf("Error processing file: %v", err)
+	}
+
+	if modifiedContent != expected {
+		t.Fatalf("Expected modified content to be %v, but got %v", expected, modifiedContent)
+	}
+}
+
+func TestComplexFileSimpleExpression(t *testing.T) {
+	fileContents := `
+		<config>
+			<item>
+				<value>100</value>
+			</item>
+			<item>
+				<value>200</value>
+			</item>
+			<item> <value>300</value> </item>
+		</config>
+	`
+	expected := `
+		<config>
+			<item>
+				<value>150</value>
+			</item>
+			<item>
+				<value>300</value>
+			</item>
+			<item> <value>450</value> </item>
+		</config>
+	`
+
+	regex := regexp.MustCompile(`<value>(\d+)</value>`)
+	luaExpr := `*1.5`
+
+	modifiedContent, err := process(fileContents, regex, luaExpr)
+	if err != nil {
+		t.Fatalf("Error processing file: %v", err)
+	}
+
+	if modifiedContent != expected {
+		t.Fatalf("Expected modified content to be %v, but got %v", expected, modifiedContent)
+	}
+}
+
+func TestComplexFileVExpression(t *testing.T) {
+	fileContents := `
+		<config>
+			<item>
+				<value>100</value>
+			</item>
+			<item>
+				<value>200</value>
+			</item>
+			<item> <value>300</value> </item>
+		</config>
+	`
+	expected := `
+		<config>
+			<item>
+				<value>150</value>
+			</item>
+			<item>
+				<value>300</value>
+			</item>
+			<item> <value>450</value> </item>
+		</config>
+	`
+
+	regex := regexp.MustCompile(`<value>(\d+)</value>`)
+	luaExpr := `v1 * 1.5`
+
+	modifiedContent, err := process(fileContents, regex, luaExpr)
+	if err != nil {
+		t.Fatalf("Error processing file: %v", err)
+	}
+
+	if modifiedContent != expected {
+		t.Fatalf("Expected modified content to be %v, but got %v", expected, modifiedContent)
+	}
+}
+
+func TestComplexFileTableVExpression(t *testing.T) {
+	fileContents := `
+		<config>
+			<item>
+				<value>100</value>
+			</item>
+			<item>
+				<value>200</value>
+			</item>
+			<item> <value>300</value> </item>
+		</config>
+	`
+	expected := `
+		<config>
+			<item>
+				<value>150</value>
+			</item>
+			<item>
+				<value>300</value>
+			</item>
+			<item> <value>450</value> </item>
+		</config>
+	`
+
+	regex := regexp.MustCompile(`<value>(\d+)</value>`)
+	luaExpr := `v[1] * 1.5`
+
+	modifiedContent, err := process(fileContents, regex, luaExpr)
+	if err != nil {
+		t.Fatalf("Error processing file: %v", err)
+	}
+
+	if modifiedContent != expected {
+		t.Fatalf("Expected modified content to be %v, but got %v", expected, modifiedContent)
+	}
+}