Add more QoL and high prio features

theme_test.go

@@ -1,6 +1,9 @@
 package main
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
 
 func TestApplyThemeChangesAllRenderingThemes(t *testing.T) {
 	defer func() {
@@ -18,3 +21,14 @@ func TestApplyThemeChangesAllRenderingThemes(t *testing.T) {
 		t.Fatal("unknown theme was accepted")
 	}
 }
+
+func TestNoColorThemeDisablesSyntaxColors(t *testing.T) {
+	defer applyTheme("dark")
+	if err := applyTheme("no-color"); err != nil {
+		t.Fatal(err)
+	}
+	rendered := highlightedSource("go", "func main() {}")
+	if strings.Contains(rendered, "\x1b[") || colorEnabled {
+		t.Fatalf("no-color source contains terminal colors: %q", rendered)
+	}
+}