Create templates in script editors

gui/src/app/FileEditor/StanFileEditor.tsx

@@ -234,7 +234,7 @@ const StanFileEditor: FunctionComponent<Props> = ({
         readOnly={!isCompiling ? readOnly : true}
         toolbarItems={toolbarItems}
         codeMarkers={stancErrorsToCodeMarkers(stancErrors)}
-        hintTextOnEmpty="Begin editing or select an example from the left panel"
+        contentOnEmpty="Begin editing or select an example from the left panel"
       />
       {window}
     </Splitter>

gui/src/app/FileEditor/TextEditor.tsx

@@ -27,7 +27,7 @@ type Props = {
   toolbarItems?: ToolbarItem[];
   label: string;
   codeMarkers?: CodeMarker[];
-  hintTextOnEmpty?: string;
+  contentOnEmpty?: string | HTMLSpanElement;
 };
 
 export type ToolbarItem =
@@ -55,7 +55,7 @@ const TextEditor: FunctionComponent<Props> = ({
   language,
   label,
   codeMarkers,
-  hintTextOnEmpty,
+  contentOnEmpty,
 }) => {
   const handleChange = useCallback(
     (value: string | undefined) => {
@@ -104,16 +104,16 @@ const TextEditor: FunctionComponent<Props> = ({
 
   useEffect(() => {
     if (!editorInstance) return;
-    if (!hintTextOnEmpty) return;
+    if (!contentOnEmpty) return;
     if (text || editedText) {
       return;
     }
-    const contentWidget = createHintTextContentWidget(hintTextOnEmpty);
+    const contentWidget = createHintTextContentWidget(contentOnEmpty);
     editorInstance.addContentWidget(contentWidget);
     return () => {
       editorInstance.removeContentWidget(contentWidget);
     };
-  }, [text, editorInstance, editedText, hintTextOnEmpty]);
+  }, [text, editorInstance, editedText, contentOnEmpty]);
 
   /////////////////////////////////////////////////
 
@@ -242,14 +242,18 @@ const NotSelectable: FunctionComponent<PropsWithChildren> = ({ children }) => {
   return <div className="NotSelectable">{children}</div>;
 };
 
-const createHintTextContentWidget = (hintText: string) => {
+const createHintTextContentWidget = (content: string | HTMLSpanElement) => {
   return {
     getDomNode: () => {
       const node = document.createElement("div");
       node.style.width = "max-content";
-      node.style.pointerEvents = "none";
       node.className = "EditorHintText";
-      node.textContent = hintText;
+      const spanElement =
+        typeof content === "string" ? document.createElement("span") : content;
+      if (typeof content === "string") {
+        spanElement.textContent = content;
+      }
+      node.appendChild(spanElement);
       return node;
     },
     getId: () => "hintText",

gui/src/app/pages/HomePage/DataGenerationWindow/DataPyFileEditor.tsx

@@ -87,6 +87,21 @@ const DataPyFileEditor: FunctionComponent<Props> = ({
     [fileContent, editedFileContent, handleRun, status, handleHelp],
   );
 
+  const contentOnEmpty = useMemo(() => {
+    const spanElement = document.createElement("span");
+    const t1 = document.createTextNode(
+      "Define a dictionary called data to update the data.json. ",
+    );
+    const a1 = document.createElement("a");
+    a1.onclick = () => {
+      setEditedFileContent(dataPyTemplate);
+    };
+    a1.textContent = "Click here to generate an example";
+    spanElement.appendChild(t1);
+    spanElement.appendChild(a1);
+    return spanElement;
+  }, [setEditedFileContent]);
+
   return (
     <TextEditor
       language="python"
@@ -97,8 +112,13 @@ const DataPyFileEditor: FunctionComponent<Props> = ({
       onSetEditedText={setEditedFileContent}
       readOnly={readOnly}
       toolbarItems={toolbarItems}
+      contentOnEmpty={contentOnEmpty}
     />
   );
 };
 
+const dataPyTemplate = `data = {
+  "a": [1, 2, 3]
+}`;
+
 export default DataPyFileEditor;

gui/src/app/pages/HomePage/DataGenerationWindow/DataRFileEditor.tsx

@@ -121,6 +121,21 @@ if (typeof(data) != "list") {
     [fileContent, editedFileContent, handleRun, status, handleHelp],
   );
 
+  const contentOnEmpty = useMemo(() => {
+    const spanElement = document.createElement("span");
+    const t1 = document.createTextNode(
+      "Define a list called data to update the data.json. ",
+    );
+    const a1 = document.createElement("a");
+    a1.onclick = () => {
+      setEditedFileContent(dataRTemplate);
+    };
+    a1.textContent = "Click here to generate an example";
+    spanElement.appendChild(t1);
+    spanElement.appendChild(a1);
+    return spanElement;
+  }, [setEditedFileContent]);
+
   return (
     <TextEditor
       language="r"
@@ -131,8 +146,13 @@ if (typeof(data) != "list") {
       onSetEditedText={setEditedFileContent}
       readOnly={readOnly}
       toolbarItems={toolbarItems}
+      contentOnEmpty={contentOnEmpty}
     />
   );
 };
 
+const dataRTemplate = `data <- list(
+  a = c(1, 2, 3)
+)`;
+
 export default DataRFileEditor;

gui/src/app/pyodide/AnalysisPyFileEditor.tsx

@@ -158,6 +158,21 @@ const AnalysisPyFileEditor: FunctionComponent<Props> = ({
     return ret;
   }, [fileContent, editedFileContent, imagesRef, hasData, status, handleRun]);
 
+  const contentOnEmpty = useMemo(() => {
+    const spanElement = document.createElement("span");
+    const t1 = document.createTextNode(
+      "Use the draws object to access the samples. ",
+    );
+    const a1 = document.createElement("a");
+    a1.onclick = () => {
+      setEditedFileContent(analysisPyTemplate);
+    };
+    a1.textContent = "Click here to generate an example";
+    spanElement.appendChild(t1);
+    spanElement.appendChild(a1);
+    return spanElement;
+  }, [setEditedFileContent]);
+
   return (
     <TextEditor
       language="python"
@@ -168,10 +183,27 @@ const AnalysisPyFileEditor: FunctionComponent<Props> = ({
       onSetEditedText={setEditedFileContent}
       readOnly={readOnly}
       toolbarItems={toolbarItems}
+      contentOnEmpty={contentOnEmpty}
     />
   );
 };
 
+const analysisPyTemplate = `import matplotlib.pyplot as plt
+
+# Print the draws object
+print(draws)
+
+# Print parameter names
+print(draws.parameter_names)
+
+# plot the lp parameter
+samples = draws.get("lp__")
+print(samples.shape)
+plt.hist(samples.ravel(), bins=30)
+plt.title("lp__")
+plt.show()
+`;
+
 type ConsoleOutType = "stdout" | "stderr";
 
 export const writeConsoleOutToDiv = (

gui/src/localStyles.css

@@ -196,4 +196,11 @@ span.EditorTitle {
 .EditorHintText {
   font-style: italic;
   color: #aaa;
-}
+  pointer-events: none;
+}
+
+.EditorHintText a {
+  color: gray;
+  text-decoration: underline;
+  pointer-events: all;
+}