dag: Update color code

dag/color.go

@@ -0,0 +1,34 @@
+package dag
+
+import (
+	"fmt"
+	"strings"
+)
+
+func (g *Graph) colorInfo(format string) string {
+	return g.color(g.InfoColor, format)
+}
+
+func (g *Graph) colorInfoBold(format string) string {
+	return g.color(g.InfoBoldColor, format)
+}
+
+func (g *Graph) colorError(format string) string {
+	return g.color(g.ErrorColor, format)
+}
+
+func (g *Graph) colorErrorBold(format string) string {
+	return g.color(g.ErrorBoldColor, format)
+}
+
+func (g *Graph) color(color string, format string) string {
+	if !g.UseColor {
+		return format
+	}
+	if !strings.HasSuffix(format, "\n") {
+		return fmt.Sprintf("\033[%sm%s\033[0m", color, format)
+	}
+
+	format = format[:len(format)-1]
+	return fmt.Sprintf("\033[%sm%s\033[0m\n", color, format)
+}

dag/dag.go

@@ -30,13 +30,16 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log"
 	"os"
 	"sync"
 	"time"
 
 	"github.com/DavidGamba/go-getoptions"
 )
 
+var Logger = log.New(os.Stderr, "", log.LstdFlags)
+
 type (
 	ID string