term: simplify can_show_color_on_stdout_cache and can_show_color_on_stderr_cache, in order to make term directly usable with the native backend

Author: spytheman

vlib/term/term.v

@@ -14,28 +14,32 @@ pub mut:
 	y int
 }
 
-__global can_show_color_on_stdout_cache = ?bool(none)
-__global can_show_color_on_stderr_cache = ?bool(none)
+__global can_show_color_on_stdout_cache = 0
+__global can_show_color_on_stderr_cache = 0
 
 // can_show_color_on_stdout returns true, if colors are allowed in stdout.
 // It returns false otherwise.
 pub fn can_show_color_on_stdout() bool {
-	if status := can_show_color_on_stdout_cache {
-		return status
+	match can_show_color_on_stdout_cache {
+		1 { return true }
+		-1 { return false }
+		else {}
 	}
 	status := supports_escape_sequences(1)
-	can_show_color_on_stdout_cache = status
+	can_show_color_on_stdout_cache = if status { 1 } else { -1 }
 	return status
 }
 
 // can_show_color_on_stderr returns true, if colors are allowed in stderr.
 // It returns false otherwise.
 pub fn can_show_color_on_stderr() bool {
-	if status := can_show_color_on_stderr_cache {
-		return status
+	match can_show_color_on_stderr_cache {
+		1 { return true }
+		-1 { return false }
+		else {}
 	}
 	status := supports_escape_sequences(2)
-	can_show_color_on_stderr_cache = status
+	can_show_color_on_stderr_cache = if status { 1 } else { -1 }
 	return status
 }