Better debug messages and logging handling

src/settings/mod.rs

@@ -347,16 +347,24 @@ impl Settings {
         debug!("===============================================");
         for rule in rules {
             debug!(
-                "from: {}\tto: {}",
+                "from: \"{}\"\tto: \"{}\"",
                 rule.get_from().to_string(),
                 rule.get_to()
             );
-            debug!("old: {}", s);
-            s = rule
+            let old = s.clone();
+            let new = rule
                 .get_from()
                 .replace_all(&s, rule.get_to().as_str())
                 .to_string();
-            debug!("new: {}", s);
+            if cfg!(debug_assertions) {
+                let diffs = diff_words(&old, &new);
+                if diffs.diff().len() > 1 {
+                    debug!("diff:\n{}", diff_words(&old, &new));
+                } else {
+                    debug!("diff: No changes");
+                }
+            }
+            s = new;
         }
         Ok(s)
     }