Apply changes from sergi#126

Author: chiragjn

diffmatchpatch/diff.go

@@ -1148,15 +1148,32 @@ func (dmp *DiffMatchPatch) DiffPrettyText(diffs []Diff) string {
 	var buff bytes.Buffer
 	for _, diff := range diffs {
 		text := diff.Text
+        
+        var containsCharacters bool
+		// If the diff only consists of whitespace characters, then pretty-print the whiteshace
+		for _, char := range text {
+			if char != ' ' && char != '\n' {
+				containsCharacters = true
+				break
+			}
+		}
 
 		switch diff.Type {
 		case DiffInsert:
-			_, _ = buff.WriteString("\x1b[32m")
-			_, _ = buff.WriteString(text)
+            _, _ = buff.WriteString("\x1b[32m")
+			if !containsCharacters {
+				text = strings.ReplaceAll(text, " ", "█")
+				text = strings.ReplaceAll(text, "\n", "⏎")
+			}
+            _, _ = buff.WriteString(text)
 			_, _ = buff.WriteString("\x1b[0m")
 		case DiffDelete:
 			_, _ = buff.WriteString("\x1b[31m")
-			_, _ = buff.WriteString(text)
+			if !containsCharacters {
+				text = strings.ReplaceAll(text, " ", "█")
+				text = strings.ReplaceAll(text, "\n", "⏎")
+			}
+            _, _ = buff.WriteString(text)
 			_, _ = buff.WriteString("\x1b[0m")
 		case DiffEqual:
 			_, _ = buff.WriteString(text)

go.mod

@@ -1,4 +1,5 @@
-module github.com/sergi/go-diff
+// module github.com/sergi/go-diff
+module github.com/truefoundry/go-diff
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect