Add RISE-lab plugin for jupyterlab_rise

plugins/rise-lab.js

@@ -0,0 +1,69 @@
+// Plugin for jupyterlab_rise presentations, based on the generic plugin.
+// Slides are advanced by key presses; the deck is over when the URL stays unchanged.
+
+export const help =
+`Exports a jupyterlab_rise presentation by advancing with space key presses and
+ending when the part after the # in the URL did not change. To use it, start
+"jupyter lab", and call decktape with a URL of the form:
+http://server:port/rise/your_path/your_notebook.ipynb?token=your_token`;
+
+export const create = page => new RISElab(page);
+
+class RISElab {
+  constructor(page) {
+    this.page = page;
+    this.currentSlide = undefined;
+  }
+
+  getName() {
+    return 'RISE-lab';
+  }
+
+  isActive() {
+    return true;
+  }
+
+  async configure() {
+    // Wait for the presentation to be fully loaded
+    await this.page.waitForSelector('.reveal-viewport', { timeout: 30000 });
+    await this.page.evaluate(_ => {
+      // Hide "click here to add a new cell"
+      const footers = document.getElementsByClassName('jp-Notebook-footer');
+      for (var i = 0; i < footers.length; i++) {
+        footers[i].style.display = 'none';
+      }
+      // Hide help button so we do not need to wait for it to fade
+      const help_btn = document.getElementById('help-b');
+      if (help_btn) {
+        help_btn.style.display = 'none';
+      }
+    });
+    this.currentSlide = await this.currentSlideIndex();
+  }
+
+  slideCount() {
+    return undefined;
+  }
+
+  async hasNextSlide() {
+    // We try to advance and check whether the URL changed
+    await this.page.keyboard.press('Space');
+    const nextSlide = await this.currentSlideIndex();
+    if (nextSlide != this.currentSlide) {
+      this.currentSlide = nextSlide;
+      return true;
+    }
+    return false;
+  }
+
+  nextSlide() {
+    // We already advanced in hasNextSlide(), nothing to do
+  }
+
+  async currentSlideIndex() {
+    // We use the part after the # in the URL as the slide name
+    const hash = await this.page.evaluate(_ => window.location.hash);
+    const [, fragment] = hash.match(/^#\/?([^?]*)/) || [];
+    return fragment;
+  }
+}