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index.ts
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index.ts
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// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { Kernel, KernelMessage, Session } from '@jupyterlab/services';
import { find } from '@phosphor/algorithm';
import { JSONObject } from '@phosphor/coreutils';
import { Widget } from '@phosphor/widgets';
import { Text } from '@jupyterlab/coreutils';
import { JupyterLab, JupyterLabPlugin } from '@jupyterlab/application';
import { CodeEditor } from '@jupyterlab/codeeditor';
import { IConsoleTracker } from '@jupyterlab/console';
import { IEditorTracker } from '@jupyterlab/fileeditor';
import { INotebookTracker } from '@jupyterlab/notebook';
import { IRenderMimeRegistry } from '@jupyterlab/rendermime';
import { ITooltipManager, Tooltip } from '@jupyterlab/tooltip';
/**
* The command IDs used by the tooltip plugin.
*/
namespace CommandIDs {
export const dismiss = 'tooltip:dismiss';
export const launchConsole = 'tooltip:launch-console';
export const launchNotebook = 'tooltip:launch-notebook';
export const launchFile = 'tooltip:launch-file';
}
/**
* The main tooltip manager plugin.
*/
const manager: JupyterLabPlugin<ITooltipManager> = {
id: '@jupyterlab/tooltip-extension:manager',
autoStart: true,
provides: ITooltipManager,
activate: (app: JupyterLab): ITooltipManager => {
let tooltip: Tooltip | null = null;
// Add tooltip dismiss command.
app.commands.addCommand(CommandIDs.dismiss, {
execute: () => {
if (tooltip) {
tooltip.dispose();
tooltip = null;
}
}
});
return {
invoke(options: ITooltipManager.IOptions): Promise<void> {
const detail: 0 | 1 = 0;
const { anchor, editor, kernel, rendermime } = options;
if (tooltip) {
tooltip.dispose();
tooltip = null;
}
return Private.fetch({ detail, editor, kernel })
.then(bundle => {
tooltip = new Tooltip({ anchor, bundle, editor, rendermime });
Widget.attach(tooltip, document.body);
})
.catch(() => {
/* Fails silently. */
});
}
};
}
};
/**
* The console tooltip plugin.
*/
const consoles: JupyterLabPlugin<void> = {
id: '@jupyterlab/tooltip-extension:consoles',
autoStart: true,
requires: [ITooltipManager, IConsoleTracker],
activate: (
app: JupyterLab,
manager: ITooltipManager,
consoles: IConsoleTracker
): void => {
// Add tooltip launch command.
app.commands.addCommand(CommandIDs.launchConsole, {
execute: () => {
const parent = consoles.currentWidget;
if (!parent) {
return;
}
const anchor = parent.console;
const editor = anchor.promptCell.editor;
const kernel = anchor.session.kernel;
const rendermime = anchor.rendermime;
// If all components necessary for rendering exist, create a tooltip.
if (!!editor && !!kernel && !!rendermime) {
return manager.invoke({ anchor, editor, kernel, rendermime });
}
}
});
}
};
/**
* The notebook tooltip plugin.
*/
const notebooks: JupyterLabPlugin<void> = {
id: '@jupyterlab/tooltip-extension:notebooks',
autoStart: true,
requires: [ITooltipManager, INotebookTracker],
activate: (
app: JupyterLab,
manager: ITooltipManager,
notebooks: INotebookTracker
): void => {
// Add tooltip launch command.
app.commands.addCommand(CommandIDs.launchNotebook, {
execute: () => {
const parent = notebooks.currentWidget;
if (!parent) {
return;
}
const anchor = parent.content;
const editor = anchor.activeCell.editor;
const kernel = parent.session.kernel;
const rendermime = parent.rendermime;
// If all components necessary for rendering exist, create a tooltip.
if (!!editor && !!kernel && !!rendermime) {
return manager.invoke({ anchor, editor, kernel, rendermime });
}
}
});
}
};
/**
* The file editor tooltip plugin.
*/
const files: JupyterLabPlugin<void> = {
id: '@jupyterlab/tooltip-extension:files',
autoStart: true,
requires: [ITooltipManager, IEditorTracker, IRenderMimeRegistry],
activate: (
app: JupyterLab,
manager: ITooltipManager,
editorTracker: IEditorTracker,
rendermime: IRenderMimeRegistry
): void => {
// Keep a list of active ISessions so that we can
// clean them up when they are no longer needed.
const activeSessions: {
[id: string]: Session.ISession;
} = {};
const sessions = app.serviceManager.sessions;
// When the list of running sessions changes,
// check to see if there are any kernels with a
// matching path for the file editors.
const onRunningChanged = (
sender: Session.IManager,
models: Session.IModel[]
) => {
editorTracker.forEach(file => {
const model = find(models, m => file.context.path === m.path);
if (model) {
const oldSession = activeSessions[file.id];
// If there is a matching path, but it is the same
// session as we previously had, do nothing.
if (oldSession && oldSession.id === model.id) {
return;
}
// Otherwise, dispose of the old session and reset to
// a new CompletionConnector.
if (oldSession) {
delete activeSessions[file.id];
oldSession.dispose();
}
const session = sessions.connectTo(model);
activeSessions[file.id] = session;
} else {
const session = activeSessions[file.id];
if (session) {
session.dispose();
delete activeSessions[file.id];
}
}
});
};
Session.listRunning().then(models => {
onRunningChanged(sessions, models);
});
sessions.runningChanged.connect(onRunningChanged);
// Clean up after a widget when it is disposed
editorTracker.widgetAdded.connect((sender, widget) => {
widget.disposed.connect(w => {
const session = activeSessions[w.id];
if (session) {
session.dispose();
delete activeSessions[w.id];
}
});
});
// Add tooltip launch command.
app.commands.addCommand(CommandIDs.launchFile, {
execute: async () => {
const parent = editorTracker.currentWidget;
const kernel =
parent &&
activeSessions[parent.id] &&
activeSessions[parent.id].kernel;
if (!kernel) {
return;
}
const anchor = parent.content;
const editor = anchor.editor;
// If all components necessary for rendering exist, create a tooltip.
if (!!editor && !!kernel && !!rendermime) {
return manager.invoke({ anchor, editor, kernel, rendermime });
}
}
});
}
};
/**
* Export the plugins as default.
*/
const plugins: JupyterLabPlugin<any>[] = [manager, consoles, notebooks, files];
export default plugins;
/**
* A namespace for private data.
*/
namespace Private {
/**
* A counter for outstanding requests.
*/
let pending = 0;
export interface IFetchOptions {
/**
* The detail level requested from the API.
*
* #### Notes
* The only acceptable values are 0 and 1. The default value is 0.
* @see http://jupyter-client.readthedocs.io/en/latest/messaging.html#introspection
*/
detail?: 0 | 1;
/**
* The referent editor for the tooltip.
*/
editor: CodeEditor.IEditor;
/**
* The kernel against which the API request will be made.
*/
kernel: Kernel.IKernelConnection;
}
/**
* Fetch a tooltip's content from the API server.
*/
export function fetch(options: IFetchOptions): Promise<JSONObject> {
let { detail, editor, kernel } = options;
let code = editor.model.value.text;
let position = editor.getCursorPosition();
let offset = Text.jsIndexToCharIndex(editor.getOffsetAt(position), code);
// Clear hints if the new text value is empty or kernel is unavailable.
if (!code || !kernel) {
return Promise.reject(void 0);
}
let contents: KernelMessage.IInspectRequest = {
code,
cursor_pos: offset,
detail_level: detail || 0
};
let current = ++pending;
return kernel.requestInspect(contents).then(msg => {
let value = msg.content;
// If a newer request is pending, bail.
if (current !== pending) {
return Promise.reject(void 0) as Promise<JSONObject>;
}
// If request fails or returns negative results, bail.
if (value.status !== 'ok' || !value.found) {
return Promise.reject(void 0) as Promise<JSONObject>;
}
return Promise.resolve(value.data);
});
}
}