Rework coloring a little

Inspired by synclib

main.go

@@ -1,4 +1,5 @@
-package cylogger
+// package cylogger
+package main
 
 import (
 	"bytes"
@@ -49,19 +50,19 @@ var levelNames = map[LogLevel]string{
 }
 
 var levelColors = map[LogLevel]string{
-	LevelError:   "\033[1;31m", // Bold Red
+	LevelError:   BRed,
-	LevelWarning: "\033[1;33m", // Bold Yellow
+	LevelWarning: BYellow,
-	LevelInfo:    "\033[1;32m", // Bold Green
+	LevelInfo:    BGreen,
-	LevelDebug:   "\033[1;36m", // Bold Cyan
+	LevelDebug:   BCyan,
-	LevelTrace:   "\033[1;35m", // Bold Magenta
+	LevelTrace:   BPurple,
-	LevelLua:     "\033[1;34m", // Bold Blue
+	LevelLua:     BBlue,
-	LevelPrefix:  "\033[0;90m", // Regular Dark Grey
+	LevelPrefix:  BIBlack,
 }
 
 // ANSI Background Colors
 var levelBackgroundColors = map[LogLevel]string{
-	LevelError:   "\033[41m", // Red Background
+	LevelError:   On_IRed,
-	LevelWarning: "\033[43m", // Yellow Background
+	LevelWarning: On_IYellow,
 }
 
 // ANSI Foreground Colors (adjusting for readability on backgrounds)
@@ -318,56 +319,54 @@ func (l *Logger) formatMessage(level LogLevel, format string, args ...interface{
 		fields = " " + strings.Join(pairs, " ")
 	}
 
-	var levelColor, bgColor, msgFgColor, resetColor string
+	var levelColor, originalBgColor, resetColor, tagFgColor, tagBgColor, messageFgColor, messageBgColor string
-	useBgColor := false // Flag to indicate if background color should be used
+	useSpecialFormatting := false // Flag for ERROR/WARNING levels
 	if l.useColors {
 		resetColor = ResetColor
-		levelColor = levelColors[level] // Color for the level tag text ONLY
+		levelColor = levelColors[level] // Base color for the level text (e.g., BRed, BYellow)
 
-		if bg, ok := levelBackgroundColors[level]; ok { // Check if this level has a background color defined (ERROR/WARNING)
+		if bg, ok := levelBackgroundColors[level]; ok { // Check if ERROR or WARNING has a background color defined
-			bgColor = bg
+			useSpecialFormatting = true
-			msgFgColor = FgWhiteBold // Use bold white for the message part on colored background
+			originalBgColor = bg             // Store original background (e.g., On_IRed, On_IYellow)
-			useBgColor = true
+			tagFgColor = levelColor          // Use original level color for tag text (BRed/BYellow)
+			tagBgColor = On_White            // Use White background FOR THE TAG
+			messageFgColor = FgWhiteBold     // Use Bold White text FOR THE MESSAGE PART
+			messageBgColor = originalBgColor // Use original background FOR THE MESSAGE PART
 		} else {
-			// For other levels, message part uses default terminal color.
+			// For other levels (INFO, DEBUG, etc.)
-			// msgFgColor remains empty, bgColor remains empty.
+			tagFgColor = levelColor // Just the standard foreground color for the tag text
-			// levelColor is still needed for the tag below.
+			// tagBgColor, messageFgColor, messageBgColor remain empty (use terminal defaults)
 		}
 	}
 
 	var caller string
 	if l.flag&log.Lshortfile != 0 || l.flag&log.Llongfile != 0 {
-		// Find the actual caller by scanning up the stack
-		// until we find a function outside the logger package
 		var file string
 		var line int
 		var ok bool
-
 		// Start at a reasonable depth and scan up to 10 frames
 		for depth := 4; depth < 15; depth++ {
 			_, file, line, ok = runtime.Caller(depth)
 			if !ok {
 				break
 			}
-
+			// Check if the caller is within this logger package itself
-			// If the caller is not in the logger package, we found our caller
+			if !strings.Contains(file, "main.go") && !strings.Contains(file, "colors.go") {
-			if !strings.Contains(file, "logger/logger.go") {
 				break
 			}
 		}
-
 		if !ok {
 			file = "???"
 			line = 0
 		}
-
 		if l.flag&log.Lshortfile != 0 {
 			file = filepath.Base(file)
 		}
+		// Caller string - no background color applied here
 		caller = fmt.Sprintf("%-25s ", file+":"+strconv.Itoa(line))
 	}
 
-	// Format the timestamp with fixed width
+	// Format the timestamp with fixed width - no background color applied here
 	var timeStr string
 	if l.flag&(log.Ldate|log.Ltime|log.Lmicroseconds) != 0 {
 		t := time.Now()
@@ -383,41 +382,75 @@ func (l *Logger) formatMessage(level LogLevel, format string, args ...interface{
 		timeStr = fmt.Sprintf("%-15s ", timeStr)
 	}
 
-	// Add goroutine ID if enabled, with fixed width
+	// Add goroutine ID if enabled, with fixed width - no background color applied here
 	var goroutineStr string
 	if l.showGoroutine {
 		goroutineID := GetGoroutineID()
 		goroutineStr = fmt.Sprintf("[g:%-4s] ", goroutineID)
 	}
 
-	// Create a colored level indicator - color only the level name text, reset locally
+	// --- Level Tag Formatting and Padding ---
-	levelStr := fmt.Sprintf("%s%s%s", levelColor, levelNames[level], resetColor)
+	levelStr := levelNames[level]
-	levelColumn := fmt.Sprintf("%-20s", levelStr) // Pad the tag
+	visibleTagContent := fmt.Sprintf("[%s]", levelStr)
+	visibleTagLen := len(visibleTagContent)
+	paddingWidth := 10 // Target width for the level column (tag + padding)
+	numSpaces := paddingWidth - visibleTagLen
+	if numSpaces < 0 {
+		numSpaces = 1 // Ensure at least one space
+	}
+	padding := strings.Repeat(" ", numSpaces)
 
+	var levelTagFormatted string
+	if useSpecialFormatting {
+		// ERROR/WARNING: Tag has specific background and foreground
+		levelTagFormatted = fmt.Sprintf("%s%s%s%s", tagBgColor, tagFgColor, visibleTagContent, resetColor)
+	} else {
+		// Other levels: Tag has standard foreground color only
+		levelTagFormatted = fmt.Sprintf("%s%s%s", tagFgColor, visibleTagContent, resetColor)
+	}
+	levelColumn := levelTagFormatted + padding // Combine formatted tag and padding
+
+	// --- User Prefix Formatting (part of message content for coloring purposes) ---
 	userPrefixStr := ""
 	if l.userPrefix != "" {
-		// Use default foreground color for prefix (dark grey), reset locally
+		// Format the string part here, colors applied later if needed
-		prefixColor := levelColors[LevelPrefix]
+		userPrefixStr = fmt.Sprintf("[%s] ", l.userPrefix)
-		userPrefixStr = fmt.Sprintf("%s[%s]%s ", prefixColor, l.userPrefix, resetColor)
 	}
 
-	// Build the prefix part (timestamp, caller, goroutine, level tag, user prefix)
+	// --- Message Content ---
-	// These parts will use default terminal colors or their specifically set colors (like level tag)
+	messageContent := fmt.Sprintf("%s%s", msg, fields)
-	prefixPart := fmt.Sprintf("%s%s%s%s%s%s",
-		l.prefix, timeStr, caller, goroutineStr, levelColumn, userPrefixStr)
 
-	// Build the message part
+	// --- Assemble Final String ---
-	messagePart := fmt.Sprintf("%s%s", msg, fields)
+	var finalMsg strings.Builder
 
-	// Combine prefix and message, applying background/foreground ONLY to the message part
+	// Part 1: Timestamp, Caller, Goroutine ID (always default colors)
-	if useBgColor {
+	finalMsg.WriteString(l.prefix)
-		// Apply background and specific foreground ONLY to the message part
+	finalMsg.WriteString(timeStr)
-		return fmt.Sprintf("%s%s%s%s%s", prefixPart, bgColor, msgFgColor, messagePart, resetColor)
+	finalMsg.WriteString(caller)
+	finalMsg.WriteString(goroutineStr)
+
+	// Part 2: Level Column (already formatted with tag colors and padding)
+	finalMsg.WriteString(levelColumn)
+
+	// Part 3: User Prefix + Message Content (apply special formatting if needed)
+	if useSpecialFormatting {
+		// ERROR/WARNING: Apply message background and foreground to User Prefix + Message
+		finalMsg.WriteString(messageBgColor)
+		finalMsg.WriteString(messageFgColor)
+		finalMsg.WriteString(userPrefixStr) // Write user prefix inside the colored block
+		finalMsg.WriteString(messageContent)
+		finalMsg.WriteString(resetColor) // Reset after message
 	} else {
-		// For non-ERROR/WARNING, just combine prefix (with its colored tag) and the uncolored message part.
+		// Other levels: User Prefix and Message content use default colors
-		// No additional color codes needed here for the message itself.
+		// Apply specific color to user prefix if it exists
-		return fmt.Sprintf("%s%s", prefixPart, messagePart)
+		if l.userPrefix != "" {
+			prefixColor := levelColors[LevelPrefix]
+			finalMsg.WriteString(fmt.Sprintf("%s%s%s", prefixColor, userPrefixStr, resetColor))
+		} // No else needed, if userPrefix is empty, userPrefixStr is "" anyway
+		finalMsg.WriteString(messageContent) // Append message with default colors
 	}
+
+	return finalMsg.String()
 }
 
 // log logs a message at the specified level
@@ -573,3 +606,42 @@ func ShowGoroutine() bool {
 	}
 	return Default.ShowGoroutine()
 }
+
+func main() {
+	Init(LevelDebug)
+
+	// Test basic logging
+	Debug("This is a debug message")
+	Info("This is an info message")
+	Warning("This is a warning message")
+	Error("This is an error message")
+
+	// Test logging with fields
+	logger := WithField("user", "testuser")
+	logger.Info("User logged in")
+
+	// Test logging with multiple fields
+	fields := map[string]interface{}{
+		"user": "testuser",
+		"role": "admin",
+		"id":   12345,
+	}
+	WithFields(fields).Info("User details")
+
+	// Test error logging with fields
+	WithField("error", "connection failed").Error("Database error")
+
+	logger.WithPrefix("CUSTOM").Info("This is a message with a custom prefix")
+
+	// Test goroutine ID display
+	SetShowGoroutine(true)
+	Info("This message should show goroutine ID")
+
+	// Test different log levels
+	SetLevel(LevelInfo)
+	Debug("This debug message should not appear")
+	Info("This info message should appear")
+
+	// Test with custom prefix
+	WithField("prefix", "custom").Info("Message with custom prefix")
+}

safe.go

@@ -1,4 +1,4 @@
-package cylogger
+package main
 
 import (
 	"fmt"