alexeyinkin commented on code in PR #25507:
URL: https://github.com/apache/beam/pull/25507#discussion_r1112742138
##########
playground/get_your_code.md:
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@@ -0,0 +1,449 @@
+# How to Get Your Code into Apache Beam Playground
+
+Getting your code into the Playground is a three-step process:
+
+1. Prepare your code.
+2. Place your code somewhere the Playground can load it from.
+3. Create a link to view it or a code to embed.
+
+For the last two steps there are multiple options -- pick any source and use
any embedding:
+
+
+
+They can be combined, e.g.
+"put the code to the Playground catalog, embed the Playground to any HTML", or
+"upload the code to any website, embed the Playground to Apache Beam docs with
Markdown".
+
+# Table of Contents
+- [Step 1. Prepare Your Code](#step-1-prepare-your-code)
+ * [Named Sections](#named-sections)
+- [Step 2. Place your code somewhere the Playground can load it
from](#step-2-place-your-code-somewhere-the-playground-can-load-it-from)
+ * [Source 1. Playground Visible
Catalog](#source-1-playground-visible-catalog)
+ + [1. Put the file to the directory](#1-put-the-file-to-the-directory)
+ + [2. Add metadata](#2-add-metadata)
+ + [3. Make a PR](#3-make-a-pr)
+ + [4. Save the snippet path](#4-save-the-snippet-path)
+ * [Source 2. Playground Unlisted
Database](#source-2-playground-unlisted-database)
+ * [Source 3. Tour of Beam unit](#source-3-tour-of-beam-unit)
+ * [Source 4. User-shared Code](#source-4-user-shared-code)
+ * [Source 5. HTTPS](#source-5-https)
+- [Step 3. Create a link or embed](#step-3-create-a-link-or-embed)
+ * [Direct Link to the Standalone Playground Web
App](#direct-link-to-the-standalone-playground-web-app)
+ + [1. Link for a snippet from Playground Visible
Catalog](#1-link-for-a-snippet-from-playground-visible-catalog)
+ + [2. Link for a snippet from Playground Unlisted
Database](#2-link-for-a-snippet-from-playground-unlisted-database)
+ + [3. Link for a Tour of Beam Unit](#3-link-for-a-tour-of-beam-unit)
+ + [4. Link for User-shared Code](#4-link-for-user-shared-code)
+ + [5. Link for an HTTPS-served
snippet](#5-link-for-an-https-served-snippet)
+ + [6. Link to an empty editor](#6-link-to-an-empty-editor)
+ + [Passing View Options](#passing-view-options)
+ - [Read-only sections](#read-only-sections)
+ - [Folding everything except
sections](#folding-everything-except-sections)
+ - [Hiding everything except a
section](#hiding-everything-except-a-section)
+ + [Linking to multiple examples](#linking-to-multiple-examples)
+ + [Embedded vs Standalone Playground
URLs](#embedded-vs-standalone-playground-urls)
+ * [Embed into HTML](#embed-into-html)
+ + [1. Embed a snippet from Playground Visible
Catalog](#1-embed-a-snippet-from-playground-visible-catalog)
+ + [2. Embed User-shared Code](#2-embed-user-shared-code)
+ + [3. Embed a snippet from any other
source](#3-embed-a-snippet-from-any-other-source)
+ * [Embedding into the Beam
documentation](#embedding-into-the-beam-documentation)
+
+
+## Step 1. Prepare Your Code
+
+Playground has multiple features to focus users to certain parts of the code.
+It does the following to all snippets:
+
+- Folds a comment if a snippet starts with one.
+- Folds imports.
+
+Additionally it can apply the following view options:
+
+- Fold all blocks except certain ones.
+- Completely hide all code except certain parts.
+- Make certain parts read-only.
+
+If you do not need any of those view options, skip to the [next
step](#step-2-place-your-code-somewhere-the-playground-can-load-it-from).
+
+### Named Sections
+
+For those features to work, the snippet must contain sections with the
following syntax:
+
+```
+// [START section_name]
+void method() {
+...
+}
+// [END section_name]
+```
+
+See more on the syntax and limitations in the
+[README of the editor](https://pub.dev/packages/flutter_code_editor)
+that Playground uses.
+
+Create a named section for each part of your code that you want that features
for.
+
+## Step 2. Place your code somewhere the Playground can load it from
+
+### Source 1. Playground Visible Catalog
+
+If you think your snippet is beneficial to many users, it's a good idea to add
it to
+the Playground Catalog.
+
+Advantages:
+
+- Anyone can find your snippet in the dropdown when they open Playground.
+- The CI of the Beam repository guarantees your snippet builds and runs
correctly.
+- Output and graph are cached so the viewers of your snippet will not wait
when they run it.
+
+#### 1. Put the file to the directory
+
+Snippets for the Playground Catalog are automatically picked from predefined
categories
+by a workflow **(WHICH ONE?)** after merging a PR.
+
+This directories are:
+
+| SDK | Snippet path root |
+|-|-|
+| Java | **?** |
+| Python | **?** |
+| Go | **?** |
Review Comment:
`/sdks` contains the whole SDKs. Are its subdirectories really entirely
parsed in search for examples? It's a bad coupling to me because an SDK should
not be aware of Playground artifacts.
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