Work on multiple slides

index.js

@@ -231,16 +231,17 @@ async function main() {
     await page.setViewport(size);
     await page.goto('file://' + path);
 
-    // Only consider the first slide (#\\331 === #1, which is the id of the first slide)
+    let output = [];
-    // We don't take into account the other slides because it will mess up with our screenshot varification
-    let root = await page.$('#\\31');
 
-    // If there is no slide, try to run on HTML body
+    for (let pageIndex = 1;; pageIndex++) {
+
+        let root = await page.$('#\\3' + pageIndex);
         if (root === null) {
-        error('not a marp HTML file');
+            break;
-        process.exit(1);
         }
 
+        info("analysing slide " + pageIndex);
+
         // Hide slides controls
         await page.evaluate(() => {
             for (let elt of document.getElementsByClassName('bespoke-marp-osc')) {
@@ -285,11 +286,35 @@ async function main() {
         let analyse = await analyseElement(root, page, outputDir, threshold);
         info("analysis done");
 
+        // Append the current slide to the output
         if (flatten) {
+
             analyse = flattenTree(analyse);
+            for (let elt of anaylse) {
+                output.push(elt);
             }
 
-    let json = JSON.stringify(analyse, undefined, 4);
+        } else {
+
+            output.push(analyse);
+
+        }
+
+        // Go to the next page
+        await page.evaluate(el => {
+            let buttons = document.getElementsByTagName('button');
+            for (let button of buttons) {
+                if (button.title === "Next slide") {
+                    button.click();
+                }
+            }
+        });
+
+        eprintln();
+    }
+
+    info("saving output");
+    let json = JSON.stringify(output, undefined, 4);
     if (outputDir === null) {
         console.log(json);
     } else {