skip-blank-lines ignores lines that only consist of spaces

template.go

@@ -410,7 +410,7 @@ func generateFile(config Config, containers Context) bool {
 		scanner := bufio.NewScanner(bufio.NewReader(&buf))
 		for scanner.Scan() {
 			line := scanner.Text()
-			if len(line) > 0 {
+			if !isBlank(line) {
 				fmt.Fprintln(dest, line)
 			}
 		}

utils.go

@@ -3,6 +3,7 @@ package main
 import (
 	"os"
 	"strings"
+	"unicode"
 )
 
 func getEndpoint() (string, error) {
@@ -50,3 +51,12 @@ func pathExists(path string) (bool, error) {
 	}
 	return false, err
 }
+
+func isBlank(str string) bool {
+	for _, r := range str {
+		if !unicode.IsSpace(r) {
+			return false
+		}
+	}
+	return true
+}

utils_test.go

@@ -87,3 +87,29 @@ func TestSplitKeyValueSlice(t *testing.T) {
 
 	}
 }
+
+func TestIsBlank(t *testing.T) {
+
+	tests := []struct {
+		input    string
+		expected bool
+	}{
+		{"", true},
+		{" ", true},
+		{"   ", true},
+		{"\t", true},
+		{"\t\n\v\f\r\u0085\u00A0", true},
+		{"a", false},
+		{" a ", false},
+		{"a ", false},
+		{" a", false},
+		{"日本語", false},
+	}
+
+	for _, i := range tests {
+		v := isBlank(i.input)
+		if v != i.expected {
+			t.Fatalf("expected '%v'. got '%v'", i.expected, v)
+		}
+	}
+}