add disable variable util

src/domain/switch.rs

@@ -54,8 +54,10 @@ where
             let trimmed_line = line.trim_start_matches(['#', ' ']);
             if should_enable_variable(&choose_sections, &cur_sections) {
                 String::from(trimmed_line)
-            } else {
+            } else if should_disable_variable(&choose_sections, &cur_sections) {
                 format!("# {}", trimmed_line)
+            } else {
+                line.to_string()
             }
         } else {
             line.to_string()
@@ -97,6 +99,19 @@ fn should_enable_variable(choose_sections: &[Section], current_sections: &[Secti
     }
 }
 
+fn should_disable_variable(choose_sections: &[Section], current_sections: &[Section]) -> bool {
+    choose_sections.is_empty()
+        || choose_sections.iter().any(|s| s.namespace.is_none())
+        || !choose_sections
+            .iter()
+            .filter(|s| s.namespace.is_some())
+            .any(|s| {
+                current_sections
+                    .iter()
+                    .any(|s2| s.namespace == s2.namespace)
+            })
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -221,5 +236,13 @@ mod tests {
                 ]
             ));
         }
+
+        #[test]
+        fn should_disable_variables() {
+            assert!(should_disable_variable(
+                &[Section::with_namespace("debug", "on")],
+                &[Section::new("local")]
+            ));
+        }
     }
 }