Add color to compare output.

src/compare/diff.rs

@@ -84,12 +84,24 @@ impl DiffResult {
             match self.status {
                 DiffStatus::Good => {
                     if self.has_bad_children() {
-                        "BADCHILD"
+                        format!(
+                            "{color}BADCHILD{reset}",
+                            color = DiffResult::foreground_color(255, 255, 0),
+                            reset = DiffResult::reset_color(),
+                        )
                     } else {
-                        "GOOD"
+                        format!(
+                            "{color}GOOD{reset}",
+                            color = DiffResult::foreground_color(0, 255, 0),
+                            reset = DiffResult::reset_color(),
+                        )
                     }
                 }
-                DiffStatus::Bad => "BAD",
+                DiffStatus::Bad => format!(
+                    "{color}BAD{reset}",
+                    color = DiffResult::foreground_color(255, 0, 0),
+                    reset = DiffResult::reset_color(),
+                ),
             }
         };
         println!(
@@ -117,6 +129,29 @@ impl DiffResult {
             DiffStatus::Bad => true,
         }
     }
+
+    fn foreground_color(red: u8, green: u8, blue: u8) -> String {
+        format!(
+            "\x1b[38;2;{red};{green};{blue}m",
+            red = red,
+            green = green,
+            blue = blue
+        )
+    }
+
+    #[allow(dead_code)]
+    fn background_color(red: u8, green: u8, blue: u8) -> String {
+        format!(
+            "\x1b[48;2;{red};{green};{blue}m",
+            red = red,
+            green = green,
+            blue = blue
+        )
+    }
+
+    fn reset_color() -> &'static str {
+        "\x1b[0m"
+    }
 }
 
 fn compare_element<'s>(