From f5d9855a2402bb28b53c70803b25a8f9caf4e4c8 Mon Sep 17 00:00:00 2001
From: Sebastian Sdorra <sebastian.sdorra@cloudogu.com>
Date: Thu, 30 Sep 2021 16:41:04 +0200
Subject: [PATCH] Add extension points for source tree (#1816)

This change will add an extension point which allows to wrap the source tree. This is required in order to use a context provider e.g. to capture a selected file. Another extension point allows to add a row between the row of a file.
In order to implement the extension points ui-extensions has now a wrapper property and passes the children of an extension point to implementing extension.
---
 docs/en/development/ui-extensions.md          | 74 ++++++++++++++++-
 gradle/changelog/ep_history_download.yaml     |  2 +
 .../ui-extensions/src/ExtensionPoint.test.tsx | 81 +++++++++++++++++--
 scm-ui/ui-extensions/src/ExtensionPoint.tsx   | 38 ++++++---
 scm-ui/ui-extensions/src/extensionPoints.ts   | 26 ++++++
 .../src/repos/sources/components/FileTree.tsx | 68 +++++++++-------
 .../repos/sources/components/FileTreeLeaf.tsx | 59 ++++++++------
 .../src/repos/sources/containers/Sources.tsx  |  1 +
 8 files changed, 279 insertions(+), 70 deletions(-)
 create mode 100644 gradle/changelog/ep_history_download.yaml

diff --git a/docs/en/development/ui-extensions.md b/docs/en/development/ui-extensions.md
index 7f0821550f..b1490a7126 100644
--- a/docs/en/development/ui-extensions.md
+++ b/docs/en/development/ui-extensions.md
@@ -105,7 +105,7 @@ binder.bind("repo.avatar", GitAvatar, (props) => props.type === "git");
 ```
 
 ```javascript
-<ExtensionPoint name="repo.avatar" props={type: "git"} />
+<ExtensionPoint name="repo.avatar" props={{type: "git"}} />
 ```
 
 ### Typings
@@ -141,3 +141,75 @@ Negative Example:
 
 This code for example, would lead to a compile time type error because we made a typo in the `name` of the extension when binding it.
 If we had used the `bind` method without the type parameter, we would not have gotten an error but run into problems at runtime.
+
+### Children
+
+If an extension point defines children those children are propagated to the extensions as children prop e.g:
+
+```tsx
+const MyExtension:FC = ({children}) => (
+  <div className="fancy-box">{children}</div>
+)
+const App = () => {
+  binder.bind("box", MyExtension);
+  return (
+    <ExtensionPoint name="box">
+      <p>Box Content</p>
+    </ExtensionPoint>
+  );
+}
+```
+
+The example above renders the following html code:
+
+```html
+<div class="fancy-box">
+  <p>Box Content</p>
+</div>
+```
+
+An exception is when the extension already has a children property, this could be the case if jsx is directly bind.
+This exception applies not only to the children property it applies to every property.
+The example below renders `Ahoi`, because the property of the jsx overwrites the one from the extension point.  
+
+```tsx
+type Props = {
+  greeting: string;
+}
+
+const GreetingExtension:FC<Props> = ({greeting}) => (
+  <>{greeting}</>
+);
+
+const App = () => {
+  binder.bind("greet", <GreetingExtension greeting="Ahoi" />);
+  return <ExtensionPoint name="greet" props={{greeting: "Moin"}} />;
+};
+```
+
+### Wrapper
+
+Sometimes it can be useful to allow plugin developers to wrap an existing component.
+The `wrapper` property is exactly for this case, it allows to wrap an existing component with multiple extensions e.g.:
+
+```tsx
+const Outer: FC = ({ children }) => (
+  <>Outer -> {children}</>
+);
+
+const Inner: FC = ({ children }) => (
+  <>Outer -> {children}</>
+);
+
+const App = () => {
+  binder.bind("wrapped", Outer);
+  binder.bind("wrapped", Inner);
+  return (
+    <ExtensionPoint name="wrapped" renderAll={true} wrapper={true}>
+      Children
+    </ExtensionPoint>
+  );
+}
+```
+
+The example above renders `Outer -> Inner -> Children`, because each extension is passed as children to the parent extension.
diff --git a/gradle/changelog/ep_history_download.yaml b/gradle/changelog/ep_history_download.yaml
new file mode 100644
index 0000000000..c35635baf6
--- /dev/null
+++ b/gradle/changelog/ep_history_download.yaml
@@ -0,0 +1,2 @@
+- type: Added
+  description: Extension points for source tree ([#1816](https://github.com/scm-manager/scm-manager/pull/1816))
diff --git a/scm-ui/ui-extensions/src/ExtensionPoint.test.tsx b/scm-ui/ui-extensions/src/ExtensionPoint.test.tsx
index 0f627374bb..0794322c39 100644
--- a/scm-ui/ui-extensions/src/ExtensionPoint.test.tsx
+++ b/scm-ui/ui-extensions/src/ExtensionPoint.test.tsx
@@ -21,9 +21,10 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-import React from "react";
+import React, { FC } from "react";
 import ExtensionPoint from "./ExtensionPoint";
 import { shallow, mount } from "enzyme";
+// eslint-disable-next-line no-restricted-imports
 import "@scm-manager/ui-tests/enzyme";
 import binder from "./binder";
 
@@ -89,7 +90,7 @@ describe("ExtensionPoint test", () => {
       <ExtensionPoint
         name="something.special"
         props={{
-          value: "Awesome"
+          value: "Awesome",
         }}
       />
     );
@@ -126,7 +127,7 @@ describe("ExtensionPoint test", () => {
 
   it("should pass the context of the parent component", () => {
     const UserContext = React.createContext({
-      name: "anonymous"
+      name: "anonymous",
     });
 
     type HelloProps = {
@@ -148,7 +149,7 @@ describe("ExtensionPoint test", () => {
       return (
         <UserContext.Provider
           value={{
-            name: "Trillian"
+            name: "Trillian",
           }}
         >
           <ExtensionPoint name="hello" />
@@ -187,7 +188,7 @@ describe("ExtensionPoint test", () => {
     };
 
     mockedBinder.hasExtension.mockReturnValue(true);
-    mockedBinder.getExtension.mockReturnValue(<Label name="One" />);
+    mockedBinder.getExtension.mockReturnValue(Label);
 
     const rendered = mount(<ExtensionPoint name="something.special" props={{ name: "Two" }} />);
     expect(rendered.text()).toBe("Extension Two");
@@ -203,11 +204,79 @@ describe("ExtensionPoint test", () => {
     const transformer = (props: object) => {
       return {
         ...props,
-        name: "Two"
+        name: "Two",
       };
     };
 
     const rendered = mount(<ExtensionPoint name="something.special" propTransformer={transformer} />);
     expect(rendered.text()).toBe("Extension Two");
   });
+
+  it("should pass children as props", () => {
+    const label: FC = ({ children }) => {
+      return (
+        <>
+          <label>Bound Extension</label>
+          <details>{children}</details>
+        </>
+      );
+    };
+    mockedBinder.hasExtension.mockReturnValue(true);
+    mockedBinder.getExtension.mockReturnValue(label);
+
+    const rendered = mount(
+      <ExtensionPoint name="something.special">
+        <p>Cool stuff</p>
+      </ExtensionPoint>
+    );
+    const text = rendered.text();
+    expect(text).toContain("Bound Extension");
+    expect(text).toContain("Cool stuff");
+  });
+
+  it("should wrap children with multiple extensions", () => {
+    const w1: FC = ({ children }) => (
+      <>
+        <label>Outer {"-> "}</label>
+        <details>{children}</details>
+      </>
+    );
+
+    const w2: FC = ({ children }) => (
+      <>
+        <label>Inner {"-> "}</label>
+        <details>{children}</details>
+      </>
+    );
+
+    mockedBinder.hasExtension.mockReturnValue(true);
+    mockedBinder.getExtensions.mockReturnValue([w1, w2]);
+
+    const rendered = mount(
+      <ExtensionPoint name="something.special" renderAll={true} wrapper={true}>
+        <p>Children</p>
+      </ExtensionPoint>
+    );
+    const text = rendered.text();
+    expect(text).toEqual("Outer -> Inner -> Children");
+  });
+
+  it("should render children of non fc", () => {
+    const nonfc = (
+      <div>
+        <label>Non fc with children</label>
+      </div>
+    );
+
+    mockedBinder.hasExtension.mockReturnValue(true);
+    mockedBinder.getExtension.mockReturnValue(nonfc);
+
+    const rendered = mount(
+      <ExtensionPoint name="something.special">
+        <p>Children</p>
+      </ExtensionPoint>
+    );
+    const text = rendered.text();
+    expect(text).toEqual("Non fc with children");
+  });
 });
diff --git a/scm-ui/ui-extensions/src/ExtensionPoint.tsx b/scm-ui/ui-extensions/src/ExtensionPoint.tsx
index f6a1dde719..83622f0918 100644
--- a/scm-ui/ui-extensions/src/ExtensionPoint.tsx
+++ b/scm-ui/ui-extensions/src/ExtensionPoint.tsx
@@ -21,9 +21,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-import * as React from "react";
+import React, { FC, ReactNode } from "react";
 import { Binder } from "./binder";
-import { Component, FC, ReactNode } from "react";
 import useBinder from "./useBinder";
 
 type PropTransformer = (props: object) => object;
@@ -33,12 +32,14 @@ type Props = {
   renderAll?: boolean;
   props?: object;
   propTransformer?: PropTransformer;
+  wrapper?: boolean;
 };
 
 const createInstance = (Component: any, props: object, key?: number) => {
   const instanceProps = {
     ...props,
-    key
+    ...(Component.props || {}),
+    key,
   };
   if (React.isValidElement(Component)) {
     return React.cloneElement(Component, instanceProps);
@@ -51,12 +52,28 @@ const renderAllExtensions = (binder: Binder, name: string, props: object) => {
   return <>{extensions.map((cmp, index) => createInstance(cmp, props, index))}</>;
 };
 
+const renderWrapperExtensions = (binder: Binder, name: string, props: object) => {
+  const extensions = [...(binder.getExtensions(name, props) || [])];
+  extensions.reverse();
+
+  let instance: any = null;
+  extensions.forEach((cmp, index) => {
+    let instanceProps = props;
+    if (instance) {
+      instanceProps = { ...props, children: instance };
+    }
+    instance = createInstance(cmp, instanceProps, index);
+  });
+
+  return instance;
+};
+
 const renderSingleExtension = (binder: Binder, name: string, props: object) => {
   const cmp = binder.getExtension(name, props);
   if (!cmp) {
     return null;
   }
-  return createInstance(cmp, props, undefined);
+  return createInstance(cmp, props);
 };
 
 const renderDefault = (children: ReactNode) => {
@@ -67,11 +84,11 @@ const renderDefault = (children: ReactNode) => {
 };
 
 const createRenderProps = (propTransformer?: PropTransformer, props?: object) => {
-  const transform = (props: object) => {
+  const transform = (untransformedProps: object) => {
     if (!propTransformer) {
-      return props;
+      return untransformedProps;
     }
-    return propTransformer(props);
+    return propTransformer(untransformedProps);
   };
 
   return transform(props || {});
@@ -80,12 +97,15 @@ const createRenderProps = (propTransformer?: PropTransformer, props?: object) =>
 /**
  * ExtensionPoint renders components which are bound to an extension point.
  */
-const ExtensionPoint: FC<Props> = ({ name, propTransformer, props, renderAll, children }) => {
+const ExtensionPoint: FC<Props> = ({ name, propTransformer, props, renderAll, wrapper, children }) => {
   const binder = useBinder();
-  const renderProps = createRenderProps(propTransformer, props);
+  const renderProps = createRenderProps(propTransformer, { ...(props || {}), children });
   if (!binder.hasExtension(name, renderProps)) {
     return renderDefault(children);
   } else if (renderAll) {
+    if (wrapper) {
+      return renderWrapperExtensions(binder, name, renderProps);
+    }
     return renderAllExtensions(binder, name, renderProps);
   }
   return renderSingleExtension(binder, name, renderProps);
diff --git a/scm-ui/ui-extensions/src/extensionPoints.ts b/scm-ui/ui-extensions/src/extensionPoints.ts
index 9e2c9cdd30..817b4f2563 100644
--- a/scm-ui/ui-extensions/src/extensionPoints.ts
+++ b/scm-ui/ui-extensions/src/extensionPoints.ts
@@ -24,6 +24,7 @@
 
 import React from "react";
 import {
+  File,
   Branch,
   IndexResources,
   Links,
@@ -83,6 +84,31 @@ export type ReposSourcesEmptyActionbar = ExtensionPointDefinition<
   ReposSourcesEmptyActionbarExtension
 >;
 
+export type ReposSourcesTreeWrapperProps = {
+  repository: Repository;
+  directory: File;
+  baseUrl: string;
+  revision: string;
+};
+
+export type ReposSourcesTreeWrapperExtension = ExtensionPointDefinition<
+  "repos.source.tree.wrapper",
+  React.ComponentType<ReposSourcesTreeWrapperProps>
+>;
+
+export type ReposSourcesTreeRowProps = {
+  file: File;
+};
+
+export type ReposSourcesTreeRowRightExtension = ExtensionPointDefinition<
+  "repos.sources.tree.row.right",
+  React.ComponentType<ReposSourcesTreeRowProps>
+>;
+export type ReposSourcesTreeRowAfterExtension = ExtensionPointDefinition<
+  "repos.sources.tree.row.after",
+  React.ComponentType<ReposSourcesTreeRowProps>
+>;
+
 export type PrimaryNavigationLoginButtonProps = {
   links: Links;
   label: string;
diff --git a/scm-ui/ui-webapp/src/repos/sources/components/FileTree.tsx b/scm-ui/ui-webapp/src/repos/sources/components/FileTree.tsx
index 89d1a3f968..87e2367315 100644
--- a/scm-ui/ui-webapp/src/repos/sources/components/FileTree.tsx
+++ b/scm-ui/ui-webapp/src/repos/sources/components/FileTree.tsx
@@ -25,14 +25,15 @@
 import React, { FC } from "react";
 import { useTranslation } from "react-i18next";
 import styled from "styled-components";
-import { binder } from "@scm-manager/ui-extensions";
-import { File } from "@scm-manager/ui-types";
-import { Notification } from "@scm-manager/ui-components";
+import { binder, ExtensionPoint } from "@scm-manager/ui-extensions";
+import { File, Repository } from "@scm-manager/ui-types";
 import FileTreeLeaf from "./FileTreeLeaf";
 import TruncatedNotification from "./TruncatedNotification";
-import {isRootPath} from "../utils/files";
+import { isRootPath } from "../utils/files";
+import { extensionPoints } from "@scm-manager/ui-extensions";
 
 type Props = {
+  repository: Repository;
   directory: File;
   baseUrl: string;
   revision: string;
@@ -56,7 +57,7 @@ export function findParent(path: string) {
   return "";
 }
 
-const FileTree: FC<Props> = ({ directory, baseUrl, revision, fetchNextPage, isFetchingNextPage }) => {
+const FileTree: FC<Props> = ({ repository, directory, baseUrl, revision, fetchNextPage, isFetchingNextPage }) => {
   const [t] = useTranslation("repos");
   const { path } = directory;
   const files: File[] = [];
@@ -69,8 +70,8 @@ const FileTree: FC<Props> = ({ directory, baseUrl, revision, fetchNextPage, isFe
       revision,
       _links: {},
       _embedded: {
-        children: []
-      }
+        children: [],
+      },
     });
   }
 
@@ -78,30 +79,39 @@ const FileTree: FC<Props> = ({ directory, baseUrl, revision, fetchNextPage, isFe
 
   const baseUrlWithRevision = baseUrl + "/" + encodeURIComponent(revision);
 
+  const extProps: extensionPoints.ReposSourcesTreeWrapperProps = {
+    repository,
+    directory,
+    baseUrl,
+    revision,
+  };
+
   return (
     <div className="panel-block">
-      <table className="table table-hover table-sm is-fullwidth">
-        <thead>
-          <tr>
-            <FixedWidthTh />
-            <th>{t("sources.fileTree.name")}</th>
-            <th className="is-hidden-mobile">{t("sources.fileTree.length")}</th>
-            <th className="is-hidden-mobile">{t("sources.fileTree.commitDate")}</th>
-            <th className="is-hidden-touch">{t("sources.fileTree.description")}</th>
-            {binder.hasExtension("repos.sources.tree.row.right") && <th className="is-hidden-mobile" />}
-          </tr>
-        </thead>
-        <tbody>
-          {files.map((file: File) => (
-            <FileTreeLeaf key={file.name} file={file} baseUrl={baseUrlWithRevision} />
-          ))}
-        </tbody>
-      </table>
-      <TruncatedNotification
-        directory={directory}
-        fetchNextPage={fetchNextPage}
-        isFetchingNextPage={isFetchingNextPage}
-      />
+      <ExtensionPoint name="repos.source.tree.wrapper" props={extProps} renderAll={true} wrapper={true}>
+        <table className="table table-hover table-sm is-fullwidth">
+          <thead>
+            <tr>
+              <FixedWidthTh />
+              <th>{t("sources.fileTree.name")}</th>
+              <th className="is-hidden-mobile">{t("sources.fileTree.length")}</th>
+              <th className="is-hidden-mobile">{t("sources.fileTree.commitDate")}</th>
+              <th className="is-hidden-touch">{t("sources.fileTree.description")}</th>
+              {binder.hasExtension("repos.sources.tree.row.right") && <th className="is-hidden-mobile" />}
+            </tr>
+          </thead>
+          <tbody>
+            {files.map((file: File) => (
+              <FileTreeLeaf key={file.name} file={file} baseUrl={baseUrlWithRevision} />
+            ))}
+          </tbody>
+        </table>
+        <TruncatedNotification
+          directory={directory}
+          fetchNextPage={fetchNextPage}
+          isFetchingNextPage={isFetchingNextPage}
+        />
+      </ExtensionPoint>
     </div>
   );
 };
diff --git a/scm-ui/ui-webapp/src/repos/sources/components/FileTreeLeaf.tsx b/scm-ui/ui-webapp/src/repos/sources/components/FileTreeLeaf.tsx
index 33c566ef2c..6793289d34 100644
--- a/scm-ui/ui-webapp/src/repos/sources/components/FileTreeLeaf.tsx
+++ b/scm-ui/ui-webapp/src/repos/sources/components/FileTreeLeaf.tsx
@@ -25,7 +25,7 @@ import * as React from "react";
 import { WithTranslation, withTranslation } from "react-i18next";
 import classNames from "classnames";
 import styled from "styled-components";
-import { binder, ExtensionPoint } from "@scm-manager/ui-extensions";
+import { binder, ExtensionPoint, extensionPoints } from "@scm-manager/ui-extensions";
 import { File } from "@scm-manager/ui-types";
 import { DateFromNow, FileSize, Tooltip, Icon } from "@scm-manager/ui-components";
 import FileIcon from "./FileIcon";
@@ -44,6 +44,14 @@ const NoWrapTd = styled.td`
   white-space: nowrap;
 `;
 
+const ExtensionTd = styled.td`
+  white-space: nowrap;
+
+  > *:not(:last-child) {
+    margin-right: 0.5rem;
+  }
+`;
+
 class FileTreeLeaf extends React.Component<Props> {
   createFileIcon = (file: File) => {
     return (
@@ -88,31 +96,32 @@ class FileTreeLeaf extends React.Component<Props> {
     const renderFileSize = (file: File) => <FileSize bytes={file?.length ? file.length : 0} />;
     const renderCommitDate = (file: File) => <DateFromNow date={file.commitDate} />;
 
+    const extProps: extensionPoints.ReposSourcesTreeRowProps = {
+      file,
+    };
+
     return (
-      <tr>
-        <td>{this.createFileIcon(file)}</td>
-        <MinWidthTd className="is-word-break">{this.createFileName(file)}</MinWidthTd>
-        <NoWrapTd className="is-hidden-mobile">
-          {file.directory ? "" : this.contentIfPresent(file, "length", renderFileSize)}
-        </NoWrapTd>
-        <td className="is-hidden-mobile">{this.contentIfPresent(file, "commitDate", renderCommitDate)}</td>
-        <MinWidthTd className={classNames("is-word-break", "is-hidden-touch")}>
-          {this.contentIfPresent(file, "description", file => file.description)}
-        </MinWidthTd>
-        {binder.hasExtension("repos.sources.tree.row.right") && (
-          <td className="is-hidden-mobile">
-            {!file.directory && (
-              <ExtensionPoint
-                name="repos.sources.tree.row.right"
-                props={{
-                  file
-                }}
-                renderAll={true}
-              />
-            )}
-          </td>
-        )}
-      </tr>
+      <>
+        <tr>
+          <td>{this.createFileIcon(file)}</td>
+          <MinWidthTd className="is-word-break">{this.createFileName(file)}</MinWidthTd>
+          <NoWrapTd className="is-hidden-mobile">
+            {file.directory ? "" : this.contentIfPresent(file, "length", renderFileSize)}
+          </NoWrapTd>
+          <td className="is-hidden-mobile">{this.contentIfPresent(file, "commitDate", renderCommitDate)}</td>
+          <MinWidthTd className={classNames("is-word-break", "is-hidden-touch")}>
+            {this.contentIfPresent(file, "description", (file) => file.description)}
+          </MinWidthTd>
+          {binder.hasExtension("repos.sources.tree.row.right") && (
+            <ExtensionTd className="is-hidden-mobile">
+              {!file.directory && (
+                <ExtensionPoint name="repos.sources.tree.row.right" props={extProps} renderAll={true} />
+              )}
+            </ExtensionTd>
+          )}
+        </tr>
+        <ExtensionPoint name="repos.sources.tree.row.after" props={extProps} renderAll={true} />
+      </>
     );
   }
 }
diff --git a/scm-ui/ui-webapp/src/repos/sources/containers/Sources.tsx b/scm-ui/ui-webapp/src/repos/sources/containers/Sources.tsx
index da8c42ef98..0b51b56d67 100644
--- a/scm-ui/ui-webapp/src/repos/sources/containers/Sources.tsx
+++ b/scm-ui/ui-webapp/src/repos/sources/containers/Sources.tsx
@@ -149,6 +149,7 @@ const Sources: FC<Props> = ({ repository, branches, selectedBranch, baseUrl }) =
       } else {
         body = (
           <FileTree
+            repository={repository}
             directory={file}
             revision={revision || file.revision}
             baseUrl={baseUrl + "/sources"}