Implement file upload / download, fix #77

static/js/cowyo.js

@@ -353,3 +353,36 @@ $(window).load(function() {
       event.target.classList.add('deleting');
     });
 });
+
+// TODO: Avoid uploading the same thing twice (check if it's already present while allowing failed uploads to be overwritten?)
+function onUploadFinished(file) {
+    this.removeFile(file);
+    var cursorPos = $('#userInput').prop('selectionStart');
+    var cursorEnd = $('#userInput').prop('selectionEnd');
+    var v = $('#userInput').val();
+    var textBefore = v.substring(0,  cursorPos);
+    var textAfter  = v.substring(cursorPos, v.length);
+    var message = 'uploaded file';
+    if (cursorEnd > cursorPos) {
+        message = v.substring(cursorPos, cursorEnd);
+        textAfter = v.substring(cursorEnd, v.length);
+    }
+    var prefix = '';
+    if (file.type.startsWith("image")) {
+        prefix = '!';
+    }
+    var extraText = prefix+'['+message+'](' +
+        file.xhr.getResponseHeader("Location") +
+        ')';
+
+    $('#userInput').val(
+        textBefore +
+        extraText +
+        textAfter
+    );
+
+    // Select the newly-inserted link
+    $('#userInput').prop('selectionStart', cursorPos);
+    $('#userInput').prop('selectionEnd', cursorPos + extraText.length);
+    $('#userInput').trigger('keyup'); // trigger a save
+}