total rewrite

README.md

@@ -6,13 +6,14 @@
 `devslog` is zero dependency custom logging handler for Go's standard [`log/slog`](https://pkg.go.dev/log/slog) package that provides structured logging with colorful and indented structure for developing.
 
 ### Develop with this output
-![image](https://github.com/golang-cz/devslog/assets/17728576/0bae7ec7-0513-41a4-9682-0e0fc74747e7)
+![image](https://github.com/golang-cz/devslog/assets/17728576/cfdc1634-16fe-4dd0-a643-21bf519cd4fe)
 
 ### Instead of these outputs
 `TextHandler`
-![image](https://github.com/golang-cz/devslog/assets/17728576/856f7e34-dc72-4f22-bd47-9fd5cbf7dd2f)
+![image](https://github.com/golang-cz/devslog/assets/17728576/49aab1c0-93ba-409d-8637-a96eeeaaf0e1)
+
 `JSONHandler`
-![image](https://github.com/golang-cz/devslog/assets/17728576/3d4b091d-813a-461d-88e1-4cc95b9d6939)
+![image](https://github.com/golang-cz/devslog/assets/17728576/775af693-2f96-47e8-9190-5ead77b41a27)
 
 ## Install
 ```
@@ -26,7 +27,7 @@ w := os.Stdout
 
 logger := slog.New(devslog.NewHandler(w, nil))
 
-// set global logger
+// optional: set global logger
 slog.SetDefault(logger)
 ```
 

attributes.go

@@ -19,7 +19,7 @@ func (a attributes) Less(i, j int) bool {
 func (a attributes) padding(c foregroundColor) int {
 	var padding int
 	for _, e := range a {
-		color := len(cs(e.Key, c))
+		color := len(cs([]byte(e.Key), c))
 		if color > padding {
 			padding = color
 		}

attributes_test.go

@@ -5,7 +5,16 @@ import (
 	"testing"
 )
 
-func Test_AttributesLen(t *testing.T) {
+func Test_Attributes(t *testing.T) {
+	test_AttributesLen(t)
+	test_AttributesSwap(t)
+	test_AttributesLess(t)
+	test_AttributesLessGroupTrue(t)
+	test_AttributesLessGroupFalse(t)
+	test_AttributesPadding(t)
+}
+
+func test_AttributesLen(t *testing.T) {
 	someValue := slog.StringValue("value")
 	attrs := attributes{
 		slog.Attr{Key: "key1", Value: someValue},
@@ -21,7 +30,7 @@ func Test_AttributesLen(t *testing.T) {
 	}
 }
 
-func Test_AttributesSwap(t *testing.T) {
+func test_AttributesSwap(t *testing.T) {
 	attr1 := slog.Attr{Key: "key1", Value: slog.StringValue("value")}
 	attr2 := slog.Attr{Key: "key2", Value: slog.StringValue("value")}
 	attrs := attributes{
@@ -36,7 +45,7 @@ func Test_AttributesSwap(t *testing.T) {
 	}
 }
 
-func Test_AttributesLess(t *testing.T) {
+func test_AttributesLess(t *testing.T) {
 	someValue := slog.StringValue("value")
 	attrs := attributes{
 		slog.Attr{Key: "key1", Value: someValue},
@@ -50,7 +59,7 @@ func Test_AttributesLess(t *testing.T) {
 	}
 }
 
-func Test_AttributesLessGroupTrue(t *testing.T) {
+func test_AttributesLessGroupTrue(t *testing.T) {
 	attrs := attributes{
 		slog.String("key1", "someValue"),
 		slog.Group("key2", slog.String("someString", "someValue")),
@@ -63,7 +72,7 @@ func Test_AttributesLessGroupTrue(t *testing.T) {
 	}
 }
 
-func Test_AttributesLessGroupFalse(t *testing.T) {
+func test_AttributesLessGroupFalse(t *testing.T) {
 	attrs := attributes{
 		slog.Group("key1", slog.String("someString", "someValue")),
 		slog.String("key2", "someValue"),
@@ -76,7 +85,7 @@ func Test_AttributesLessGroupFalse(t *testing.T) {
 	}
 }
 
-func Test_AttributesPadding(t *testing.T) {
+func test_AttributesPadding(t *testing.T) {
 	someValue := slog.StringValue("value")
 	attrs := attributes{
 		slog.Attr{Key: "key1", Value: someValue},

color.go

@@ -1,56 +1,64 @@
 package devslog
 
-import "fmt"
-
 type (
-	foregroundColor   string
-	backgroundColor   string
-	commonValuesColor string
+	foregroundColor   []byte
+	backgroundColor   []byte
+	commonValuesColor []byte
 )
 
-const (
+var (
 	// Foreground colors
-	fgBlack   foregroundColor = "\x1b[30m"
-	fgRed     foregroundColor = "\x1b[31m"
-	fgGreen   foregroundColor = "\x1b[32m"
-	fgYellow  foregroundColor = "\x1b[33m"
-	fgBlue    foregroundColor = "\x1b[34m"
-	fgMagenta foregroundColor = "\x1b[35m"
-	fgCyan    foregroundColor = "\x1b[36m"
-	fgWhite   foregroundColor = "\x1b[37m"
+	fgBlack   foregroundColor = []byte("\x1b[30m")
+	fgRed     foregroundColor = []byte("\x1b[31m")
+	fgGreen   foregroundColor = []byte("\x1b[32m")
+	fgYellow  foregroundColor = []byte("\x1b[33m")
+	fgBlue    foregroundColor = []byte("\x1b[34m")
+	fgMagenta foregroundColor = []byte("\x1b[35m")
+	fgCyan    foregroundColor = []byte("\x1b[36m")
+	fgWhite   foregroundColor = []byte("\x1b[37m")
 
 	// Background colors
-	bgBlack   backgroundColor = "\x1b[40m"
-	bgRed     backgroundColor = "\x1b[41m"
-	bgGreen   backgroundColor = "\x1b[42m"
-	bgYellow  backgroundColor = "\x1b[43m"
-	bgBlue    backgroundColor = "\x1b[44m"
-	bgMagenta backgroundColor = "\x1b[45m"
-	bgCyan    backgroundColor = "\x1b[46m"
-	bgWhite   backgroundColor = "\x1b[47m"
+	bgBlack   backgroundColor = []byte("\x1b[40m")
+	bgRed     backgroundColor = []byte("\x1b[41m")
+	bgGreen   backgroundColor = []byte("\x1b[42m")
+	bgYellow  backgroundColor = []byte("\x1b[43m")
+	bgBlue    backgroundColor = []byte("\x1b[44m")
+	bgMagenta backgroundColor = []byte("\x1b[45m")
+	bgCyan    backgroundColor = []byte("\x1b[46m")
+	bgWhite   backgroundColor = []byte("\x1b[47m")
 
 	// Common consts
-	resetColor     commonValuesColor = "\x1b[0m"
-	faintColor     commonValuesColor = "\x1b[2m"
-	underlineColor commonValuesColor = "\x1b[4m"
+	resetColor     commonValuesColor = []byte("\x1b[0m")
+	faintColor     commonValuesColor = []byte("\x1b[2m")
+	underlineColor commonValuesColor = []byte("\x1b[4m")
 )
 
 // Color string foreground
-func cs(text string, fgColor foregroundColor) string {
-	return fmt.Sprintf("%v%v%v", fgColor, text, resetColor)
+func cs(b []byte, fgColor foregroundColor) []byte {
+	b = append(fgColor, b...)
+	b = append(b, resetColor...)
+	return b
 }
 
 // Color string fainted
-func csf(text string, fgColor foregroundColor) string {
-	return fmt.Sprintf("%v%v%v%v", fgColor, faintColor, text, resetColor)
+func csf(b []byte, fgColor foregroundColor) []byte {
+	b = append(fgColor, b...)
+	b = append(faintColor, b...)
+	b = append(b, resetColor...)
+	return b
 }
 
 // Color string background
-func csb(text string, fgColor foregroundColor, bgColor backgroundColor) string {
-	return fmt.Sprintf("%v%v%v%v", fgColor, bgColor, text, resetColor)
+func csb(b []byte, fgColor foregroundColor, bgColor backgroundColor) []byte {
+	b = append(fgColor, b...)
+	b = append(bgColor, b...)
+	b = append(b, resetColor...)
+	return b
 }
 
 // Underline text
-func ul(text string) string {
-	return fmt.Sprintf("%v%v%v", underlineColor, text, resetColor)
+func ul(b []byte) []byte {
+	b = append(underlineColor, b...)
+	b = append(b, resetColor...)
+	return b
 }

color_test.go

@@ -1,41 +1,50 @@
 package devslog
 
 import (
+	"bytes"
 	"testing"
 )
 
-func Test_ColorCs(t *testing.T) {
-	expected := "\x1b[32mHello\x1b[0m"
-	result := cs("Hello", fgGreen)
+func Test_Color(t *testing.T) {
+	b := []byte("Hello")
+	test_ColorCs(t, b)
+	test_ColorCsf(t, b)
+	test_ColorCsb(t, b)
+	test_ColorUl(t, b)
+}
+
+func test_ColorCs(t *testing.T, b []byte) {
+	result := cs(b, fgGreen)
 
-	if result != expected {
-		t.Errorf("Expected: %q, but got: %q", expected, result)
+	expected := []byte("\x1b[32mHello\x1b[0m")
+	if !bytes.Equal(expected, result) {
+		t.Errorf("\nExpected: %s\nResult:   %s\nExpected: %[1]q\nResult:   %[2]q", expected, result)
 	}
 }
 
-func Test_ColorCsf(t *testing.T) {
-	expected := "\x1b[34m\x1b[2mHello\x1b[0m"
-	result := csf("Hello", fgBlue)
+func test_ColorCsf(t *testing.T, b []byte) {
+	result := csf(b, fgBlue)
 
-	if result != expected {
-		t.Errorf("Expected: %q, but got: %q", expected, result)
+	expected := []byte("\x1b[2m\x1b[34mHello\x1b[0m")
+	if !bytes.Equal(expected, result) {
+		t.Errorf("\nExpected: %s\nResult:   %s\nExpected: %[1]q\nResult:   %[2]q", expected, result)
 	}
 }
 
-func Test_ColorCsb(t *testing.T) {
-	expected := "\x1b[35m\x1b[43mHello\x1b[0m"
-	result := csb("Hello", fgMagenta, bgYellow)
+func test_ColorCsb(t *testing.T, b []byte) {
+	result := csb(b, fgYellow, bgRed)
 
-	if result != expected {
-		t.Errorf("Expected: %q, but got: %q", expected, result)
+	expected := []byte("\x1b[41m\x1b[33mHello\x1b[0m")
+	if !bytes.Equal(expected, result) {
+		t.Errorf("\nExpected: %s\nResult:   %s\nExpected: %[1]q\nResult:   %[2]q", expected, result)
 	}
 }
 
-func Test_ColorUl(t *testing.T) {
-	expected := "\x1b[4mHello\x1b[0m"
-	result := ul("Hello")
+func test_ColorUl(t *testing.T, b []byte) {
+	result := ul(b)
 
-	if result != expected {
-		t.Errorf("Expected: %q, but got: %q", expected, result)
+	expected := []byte("\x1b[4mHello\x1b[0m")
+	if !bytes.Equal(expected, result) {
+		t.Errorf("\nExpected: %s\nResult:   %s\nExpected: %[1]q\nResult:   %[2]q", expected, result)
 	}
 }