docs: README tool count and list match Tool::ALL (#996) (#1710)

README.md

@@ -178,8 +178,8 @@ Every screenshot here is the real app at work on public-domain art, rendered off
 <table>
   <tr>
     <td width="33%" valign="top">
-      <h4>🧰 34 tools</h4>
-      Move · Rectangular and Elliptical Marquee · Lasso · Polygonal Lasso · Magnetic Lasso · Magic Wand · Quick Selection · Object Selection · Crop · Eyedropper · Brush · Pencil · Mixer Brush · Color Replacement · Eraser · Clone Stamp · Healing Brush · Spot Healing · History Brush · Gradient · Paint Bucket · Blur · Sharpen · Smudge · Dodge · Burn · Sponge · Pen · Path Selection · Type · five Shape tools · Hand · Zoom
+      <h4>🧰 52 tools</h4>
+      Move · Rectangular and Elliptical Marquee · Lasso · Polygonal Lasso · Magnetic Lasso · Object Selection · Quick Selection · Magic Wand · Crop · Slice · Slice Select · Eyedropper · Ruler · Note · Count · Spot Healing Brush · Healing Brush · Patch · Content-Aware Move · Red Eye · Brush · Pencil · Mixer Brush · Clone Stamp · Pattern Stamp · History Brush · Eraser · Background Eraser · Magic Eraser · Gradient · Paint Bucket · Blur · Sharpen · Smudge · Dodge · Burn · Sponge · Pen · Horizontal and Vertical Type · Path Selection · Direct Selection · Rectangle · Ellipse · Triangle · Polygon · Line · Custom Shape · Hand · Rotate View · Zoom
     </td>
     <td width="33%" valign="top">
       <h4>🖌️ A real brush engine</h4>

crates/ui-egui/src/state.rs

@@ -1045,6 +1045,29 @@ mod tests {
         assert_eq!(Tool::from_name("nope"), None);
     }
 
+    /// The README's "Everything in the box" tool heading and list name exactly the tools a user can
+    /// pick, `Tool::ALL` (#996).
+    #[test]
+    fn readme_tool_list_matches_tool_all() {
+        let readme = include_str!("../../../README.md");
+        let (_, rest) = readme.split_once("<h4>🧰 ").unwrap();
+        let (count, rest) = rest.split_once(" tools</h4>").unwrap();
+        assert_eq!(count.parse::<usize>().unwrap(), Tool::ALL.len(), "README.md tool heading");
+        let list = rest.trim_start().lines().next().unwrap();
+        // "Rectangular and Elliptical Marquee" names two tools: "Rectangular Marquee", "Elliptical Marquee".
+        let mut named: Vec<String> = Vec::new();
+        for entry in list.split(" · ") {
+            match entry.split_once(" and ").and_then(|(first, rest)| Some((first, rest.split_once(' ')?))) {
+                Some((first, (second, noun))) => named.extend([format!("{first} {noun}"), format!("{second} {noun}")]),
+                None => named.push(entry.to_owned()),
+            }
+        }
+        named.sort();
+        let mut labels: Vec<String> = Tool::ALL.iter().map(|tool| tool.label().trim_end_matches(" Tool").to_owned()).collect();
+        labels.sort();
+        assert_eq!(named, labels, "README.md tool list");
+    }
+
     #[test]
     fn dialogs_open_and_close() {
         let mut s = UiState::default();