fix symbols DisplaySize() + Align() + tests

internal/clifmt/symbols.go

@@ -47,25 +47,21 @@ func Align(s string) {
 	s = strings.Join(tabs, "    ")
 
 	// 2. get real size
-	size := displaySize(s)
-
+	size := DisplaySize(s)
 	offset := alignOffset
 
-	if size > alignOffset-6 {
+	if size > alignOffset-2 {
 
-		for i, l := 0, len(s); i < l; i++ { // find when real size is right under
-			next := fmt.Sprintf("%s\033[0m… ", s[0:i+1])
-			if displaySize(next) >= alignOffset-5 {
+		for i := len(s) - 1; i > 0; i-- { // find when real size is right under
+			next := fmt.Sprintf("%s\033[0m… ", s[0:i])
+
+			if DisplaySize(next) <= alignOffset {
 				s = next
+				size = DisplaySize(s)
 				break
 			}
 
 		}
-		size = displaySize(s)
-
-	} else {
-		// fix
-		offset -= 2
 	}
 
 	// 3. print string
@@ -78,9 +74,10 @@ func Align(s string) {
 }
 
 var re = regexp.MustCompile(`(?m)\[(?:\d+;)*\d+m`)
+var reDots = regexp.MustCompile(`(?m)…`)
 
-// displaySize returns the real size escaping special characters
-func displaySize(s string) int {
+// DisplaySize returns the real size escaping special characters
+func DisplaySize(s string) int {
 
 	// 1. get actual size
 	size := len(s)
@@ -91,5 +88,12 @@ func displaySize(s string) int {
 		size -= len(m)
 	}
 
+	// 3. Remove unicode character (len of 3 instead of 1)
+	matches = reDots.FindAllString(s, -1)
+	for _, m := range matches {
+		size -= len(m)
+		size += 1
+	}
+
 	return size
 }

internal/clifmt/symbols_test.go

@@ -8,7 +8,7 @@ import (
 var lastPrint = ""
 
 func mockupPrinter(format string, args ...interface{}) (int, error) {
-	lastPrint = fmt.Sprintf(format, args...)
+	lastPrint = fmt.Sprintf("%s%s", lastPrint, fmt.Sprintf(format, args...))
 	return 0, nil
 }
 
@@ -33,6 +33,7 @@ func TestSpecial(t *testing.T) {
 	for i, test := range tests {
 
 		if test.Pre != nil {
+			lastPrint = ""
 			test.Pre()
 			test.Processed = lastPrint
 		}
@@ -43,3 +44,66 @@ func TestSpecial(t *testing.T) {
 
 	}
 }
+func TestAlign(t *testing.T) {
+	defaultPrinter = mockupPrinter
+
+	tests := []struct {
+		Offset int
+		Text   string
+		Expect string
+	}{
+		{12, "1234567890  ", "1234567890  "},
+		{12, "12345678901 ", "1234567890\033[0m… "},
+		{12, "123456789012", "1234567890\033[0m… "},
+		{12, "1234567890123", "1234567890\033[0m… "},
+	}
+
+	for i, test := range tests {
+
+		lastPrint = ""
+		alignOffset = test.Offset
+		Align(test.Text)
+
+		if DisplaySize(lastPrint) != alignOffset {
+			t.Errorf("[%d] expected output to be %d chars, got %d (%s)", i, alignOffset, DisplaySize(lastPrint), escape(lastPrint))
+		}
+
+		if lastPrint != test.Expect {
+			t.Errorf("[%d] expected '%s', got '%s'", i, escape(test.Expect), escape(lastPrint))
+		}
+
+	}
+}
+
+func TestDisplaySize(t *testing.T) {
+	tests := []struct {
+		Text   string
+		Expect int
+	}{
+		{"", 0},
+		{"\033[32m\033[0m", 0},
+		{"\033[0;32m\033[0m", 0},
+
+		{"1", 1},
+		{"\033[32m1\033[0m", 1},
+		{"\033[0;32m1\033[0m", 1},
+		{"\033[0;32m1\033[0m\033[0;32m\033[1;31m\033[0m", 1},
+
+		{"123", 3},
+		{"…123", 4},
+		{"123…", 4},
+		{"…123…", 5},
+
+		{"123456789", 9},
+		{"1234567890", 10},
+		{"1234567890\033[0m… ", 12},
+	}
+
+	for i, test := range tests {
+
+		if DisplaySize(test.Text) != test.Expect {
+			t.Errorf("[%d] expected output to be %d chars, got %d (%s)", i, test.Expect, DisplaySize(test.Text), escape(lastPrint))
+		}
+
+	}
+}