add internal end-to-end docs

docs/book.toml

@@ -6,10 +6,16 @@ src = "src"
 title = "Shotover"
 
 [output.html]
+additional-js = ["mermaid.min.js", "mermaid-init.js"]
 
 [output.linkcheck]
 # Should we check links on the internet? Enabling this option adds a
 # non-negligible performance impact
 follow-web-links = false
 
 warning-policy = "error"
+
+[preprocessor]
+
+[preprocessor.mermaid]
+command = "mdbook-mermaid"

docs/mermaid-init.js

@@ -0,0 +1,35 @@
+(() => {
+    const darkThemes = ['ayu', 'navy', 'coal'];
+    const lightThemes = ['light', 'rust'];
+
+    const classList = document.getElementsByTagName('html')[0].classList;
+
+    let lastThemeWasLight = true;
+    for (const cssClass of classList) {
+        if (darkThemes.includes(cssClass)) {
+            lastThemeWasLight = false;
+            break;
+        }
+    }
+
+    const theme = lastThemeWasLight ? 'default' : 'dark';
+    mermaid.initialize({ startOnLoad: true, theme });
+
+    // Simplest way to make mermaid re-render the diagrams in the new theme is via refreshing the page
+
+    for (const darkTheme of darkThemes) {
+        document.getElementById(darkTheme).addEventListener('click', () => {
+            if (lastThemeWasLight) {
+                window.location.reload();
+            }
+        });
+    }
+
+    for (const lightTheme of lightThemes) {
+        document.getElementById(lightTheme).addEventListener('click', () => {
+            if (!lastThemeWasLight) {
+                window.location.reload();
+            }
+        });
+    }
+})();

docs/src/SUMMARY.md

@@ -18,3 +18,4 @@
     - [Shotover sidecars](./examples/cassandra-cluster-shotover-sidecar.md)
 - [Contributing](./dev-docs/contributing.md)
   - [Debugging](./dev-docs/debugging.md)
+  - [Internal End-to-End Overview](./dev-docs/end-to-end-overview.md)

website/src/main.rs

@@ -28,6 +28,15 @@ fn main() {
         return;
     }
 
+    if !Command::new("cargo")
+        .args(["install", "mdbook-mermaid", "--version", "0.14.0"])
+        .status()
+        .unwrap()
+        .success()
+    {
+        return;
+    }
+
     let root = current_dir.join("website").join("root");
     std::fs::remove_dir_all(&root).ok();
     std::fs::create_dir_all(&root).unwrap();