Jupyter chat package reorganization (#225)

* Split the chat-messages module

* Move the chat-input module in input directory

* Move the registers in a dedicated directory

* Add an index file to the widgets

Author: brichet

packages/jupyter-chat/src/chat-commands/registry.ts

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) Jupyter Development Team.
+ * Distributed under the terms of the Modified BSD License.
+ */
+
+import { Avatar as MuiAvatar, Typography } from '@mui/material';
+import type { SxProps, Theme } from '@mui/material';
+import React from 'react';
+
+import { IUser } from '../types';
+
+/**
+ * The avatar props.
+ */
+type AvatarProps = {
+  /**
+   * The user to display an avatar.
+   */
+  user: IUser;
+  /**
+   * Whether the avatar should be small.
+   */
+  small?: boolean;
+};
+
+/**
+ * The avatar component.
+ */
+export function Avatar(props: AvatarProps): JSX.Element | null {
+  const { user } = props;
+
+  const sharedStyles: SxProps<Theme> = {
+    height: `${props.small ? '16' : '24'}px`,
+    width: `${props.small ? '16' : '24'}px`,
+    bgcolor: user.color,
+    fontSize: `var(--jp-ui-font-size${props.small ? '0' : '1'})`
+  };
+
+  const name =
+    user.display_name ?? user.name ?? (user.username || 'User undefined');
+  return user.avatar_url ? (
+    <MuiAvatar
+      sx={{
+        ...sharedStyles
+      }}
+      src={user.avatar_url}
+      alt={name}
+      title={name}
+    ></MuiAvatar>
+  ) : user.initials ? (
+    <MuiAvatar
+      sx={{
+        ...sharedStyles
+      }}
+      alt={name}
+      title={name}
+    >
+      <Typography
+        sx={{
+          fontSize: `var(--jp-ui-font-size${props.small ? '0' : '1'})`,
+          color: 'var(--jp-ui-inverse-font-color1)'
+        }}
+      >
+        {user.initials}
+      </Typography>
+    </MuiAvatar>
+  ) : null;
+}