docs: frontmatter gen, colab/github links (#28852)

docs/scripts/notebook_convert.py

@@ -143,16 +143,22 @@ def _modify_frontmatter(
     edit_url = (
         f"https://github.com/langchain-ai/langchain/edit/master/docs/docs/{rel_path}"
     )
+    frontmatter = {
+        "custom_edit_url": edit_url,
+    }
     if re.match(r"^[\s\n]*---\n", body):
-        # if custom_edit_url already exists, leave it
-        if re.match(r"custom_edit_url: ", body):
+        # frontmatter already present
+
+        for k, v in frontmatter.items():
+            # if key already exists, leave it
+            if re.match(f"{k}: ", body):
+                continue
+            else:
+                body = re.sub(r"^[\s\n]*---\n", f"---\n{k}: {v}\n", body, count=1)
         return body
     else:
-            return re.sub(
-                r"^[\s\n]*---\n", f"---\ncustom_edit_url: {edit_url}\n", body, count=1
-            )
-    else:
-        return f"---\ncustom_edit_url: {edit_url}\n---\n{body}"
+        insert = "\n".join([f"{k}: {v}" for k, v in frontmatter.items()])
+        return f"---\n{insert}\n---\n{body}"
 
 
 def _convert_notebook(

docs/src/theme/DocItem/Layout/index.js

@@ -0,0 +1,85 @@
+import React from 'react';
+import clsx from 'clsx';
+import {useWindowSize} from '@docusaurus/theme-common';
+import {useDoc} from '@docusaurus/plugin-content-docs/client';
+import DocItemPaginator from '@theme/DocItem/Paginator';
+import DocVersionBanner from '@theme/DocVersionBanner';
+import DocVersionBadge from '@theme/DocVersionBadge';
+import DocItemFooter from '@theme/DocItem/Footer';
+import DocItemTOCMobile from '@theme/DocItem/TOC/Mobile';
+import DocItemTOCDesktop from '@theme/DocItem/TOC/Desktop';
+import DocItemContent from '@theme/DocItem/Content';
+import DocBreadcrumbs from '@theme/DocBreadcrumbs';
+import ContentVisibility from '@theme/ContentVisibility';
+import styles from './styles.module.css';
+/**
+ * Decide if the toc should be rendered, on mobile or desktop viewports
+ */
+function useDocTOC() {
+  const {frontMatter, toc} = useDoc();
+  const windowSize = useWindowSize();
+  const hidden = frontMatter.hide_table_of_contents;
+  const canRender = !hidden && toc.length > 0;
+  const mobile = canRender ? <DocItemTOCMobile /> : undefined;
+  const desktop =
+    canRender && (windowSize === 'desktop' || windowSize === 'ssr') ? (
+      <DocItemTOCDesktop />
+    ) : undefined;
+  return {
+    hidden,
+    mobile,
+    desktop,
+  };
+}
+export default function DocItemLayout({children}) {
+  const docTOC = useDocTOC();
+  const {metadata, frontMatter} = useDoc();
+
+  "https://github.com/langchain-ai/langchain/blob/master/docs/docs/introduction.ipynb"
+  "https://colab.research.google.com/github/langchain-ai/langchain/blob/master/docs/docs/introduction.ipynb"
+
+  console.log({metadata, frontMatter})
+
+  const linkColab = frontMatter.link_colab || (
+    metadata.editUrl?.endsWith(".ipynb") 
+      ? metadata.editUrl?.replace("https://github.com/langchain-ai/langchain/edit/", "https://colab.research.google.com/github/langchain-ai/langchain/blob/") 
+      : null
+  );
+  const linkGithub = frontMatter.link_github || metadata.editUrl?.replace("/edit/", "/blob/");
+  
+  console.log({linkColab, linkGithub})
+
+  return (
+    <div className="row">
+      <div className={clsx('col', !docTOC.hidden && styles.docItemCol)}>
+        <ContentVisibility metadata={metadata} />
+        <DocVersionBanner />
+        <div className={styles.docItemContainer}>
+          <article>
+            <DocBreadcrumbs />
+            <DocVersionBadge />
+            {docTOC.mobile}
+            <div style={{ 
+              display: "flex", 
+              flexDirection: "column",
+              alignItems: "flex-end",
+              float: "right",
+            }}>
+              {linkColab && (<a target="_blank" href={linkColab}>
+                <img src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open In Colab"/>
+              </a>)}
+              {linkGithub && (<a href={linkGithub} target="_blank">
+                <img src="https://img.shields.io/badge/Open%20on%20GitHub-grey?logo=github&logoColor=white" 
+                    alt="Open on GitHub" />
+              </a>)}
+            </div>
+            <DocItemContent>{children}</DocItemContent>
+            <DocItemFooter />
+          </article>
+          <DocItemPaginator />
+        </div>
+      </div>
+      {docTOC.desktop && <div className="col col--3">{docTOC.desktop}</div>}
+    </div>
+  );
+}

docs/src/theme/DocItem/Layout/styles.module.css

@@ -0,0 +1,10 @@
+.docItemContainer header + *,
+.docItemContainer article > *:first-child {
+  margin-top: 0;
+}
+
+@media (min-width: 997px) {
+  .docItemCol {
+    max-width: 75% !important;
+  }
+}