add support for inverting whitelist

src/opts.rs

@@ -53,7 +53,7 @@ impl Options {
             .args_from_usage("-c, --no-css 'Removes CSS'")
             .args_from_usage("-C, --charset=[UTF-8] 'Enforces custom encoding'")
             .args_from_usage(
-                "-D, --domains=[bad.org,ads.site,0.0.0.0,127.0.0.0:8080] 'Whitelist of domains'",
+                "-D, --domains=[bad.org,ads.site,127.0.0.0:8080] 'Whitelist of domains'",
             )
             .args_from_usage("-e, --ignore-errors 'Ignore network errors'")
             .args_from_usage("-E, --exclude-domains 'Treat list of specified domains as blacklist'")

src/utils.rs

@@ -266,12 +266,23 @@ pub fn retrieve_asset(
                 "".to_string(),
             ))
         } else {
-            if let Some(domains) = &options.domains {
-                if domains
-                    .iter()
-                    .any(|d| domain_is_within_domain(url.host_str().unwrap(), &d.trim()))
-                {
-                    return Err(client.get("").send().unwrap_err());
+            if options.exclude_domains {
+                if let Some(domains) = &options.domains {
+                    if domains
+                        .iter()
+                        .any(|d| domain_is_within_domain(url.host_str().unwrap(), &d.trim()))
+                    {
+                        return Err(client.get("").send().unwrap_err());
+                    }
+                }
+            } else {
+                if let Some(domains) = &options.domains {
+                    if domains
+                        .iter()
+                        .any(|d| !domain_is_within_domain(url.host_str().unwrap(), &d.trim()))
+                    {
+                        return Err(client.get("").send().unwrap_err());
+                    }
                 }
             }