breaking out styles into smaller files; break out chat helper functions into utils

webroot/js/utils/chat.js

@@ -8,7 +8,7 @@ export const CHAT_PLACEHOLDER_OFFLINE = 'Chat is offline.';
 
 export function formatMessageText(message) {
   showdown.setFlavor('github');
-  var markdownToHTML = new showdown.Converter({
+  let formattedText = new showdown.Converter({
     emoji: true,
     openLinksInNewWindow: true,
     tables: false,
@@ -16,20 +16,158 @@ export function formatMessageText(message) {
     literalMidWordUnderscores: true,
     strikethrough: true,
     ghMentions: false,
-  }).makeHtml(this.body);
-  const linked = autoLink(markdownToHTML, {
-    embed: true,
-    removeHTTP: true,
-    linkAttr: {
-      target: '_blank'
-    }
-  });
-  const highlighted = highlightUsername(linked);
-  return addNewlines(highlighted);
+  }).makeHtml(message);
+
+  formattedText = linkify(formattedText, message);
+  formattedText = highlightUsername(formattedText);
+
+  return addNewlines(formattedText);
 }
 
 function highlightUsername(message) {
   const username = document.getElementById('self-message-author').value;
-  const pattern = new RegExp('@?' + username.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), 'gi');
+	const pattern = new RegExp('@?' + username.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), 'gi');
   return message.replace(pattern, '<span class="highlighted">$&</span>');
 }
+
+function linkify(text, rawText) {
+  const urls = getURLs(stripTags(rawText));
+  if (urls) {
+    urls.forEach(function (url) {
+      let linkURL = url;
+
+      // Add http prefix if none exist in the URL so it actually
+      // will work in an anchor tag.
+      if (linkURL.indexOf('http') === -1) {
+        linkURL = 'http://' + linkURL;
+      }
+
+      // Remove the protocol prefix in the display URLs just to make
+      // things look a little nicer.
+      const displayURL = url.replace(/(^\w+:|^)\/\//, '');
+      const link = `<a href="${linkURL}" target="_blank">${displayURL}</a>`;
+      text = text.replace(url, link);
+
+      if (getYoutubeIdFromURL(url)) {
+        if (isTextJustURLs(text, [url, displayURL])) {
+          text = '';
+        } else {
+          text += '<br/>';
+        }
+
+        const youtubeID = getYoutubeIdFromURL(url);
+        text += getYoutubeEmbedFromID(youtubeID);
+      } else if (url.indexOf('instagram.com/p/') > -1) {
+        if (isTextJustURLs(text, [url, displayURL])) {
+          text = '';
+        } else {
+          text += `<br/>`;
+        }
+        text += getInstagramEmbedFromURL(url);
+      } else if (isImage(url)) {
+        if (isTextJustURLs(text, [url, displayURL])) {
+          text = '';
+        } else {
+          text += `<br/>`;
+        }
+        text += getImageForURL(url);
+      }
+    }.bind(this));
+  }
+  return text;
+}
+
+function isTextJustURLs(text, urls) {
+  for (var i = 0; i < urls.length; i++) {
+    const url = urls[i];
+    if (stripTags(text) === url) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
+function stripTags(str) {
+	return str.replace(/<\/?[^>]+(>|$)/g, "");
+}
+
+function getURLs(str) {
+	var exp = /((\w+:\/\/\S+)|(\w+[\.:]\w+\S+))[^\s,\.]/ig;
+	return str.match(exp);
+}
+
+function getYoutubeIdFromURL(url) {
+	try {
+		var regExp = /^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/;
+		var match = url.match(regExp);
+
+		if (match && match[2].length == 11) {
+			return match[2];
+		} else {
+			return null;
+		}
+	} catch (e) {
+		console.log(e);
+		return null;
+	}
+}
+
+function getYoutubeEmbedFromID(id) {
+	return `<iframe class="chat-embed" src="//www.youtube.com/embed/${id}" frameborder="0" allowfullscreen></iframe>`;
+}
+
+function getInstagramEmbedFromURL(url) {
+	const urlObject = new URL(url.replace(/\/$/, ""));
+	urlObject.pathname += "/embed";
+	return `<iframe class="chat-embed instagram-embed" height="150px" src="${urlObject.href}" frameborder="0" allowfullscreen></iframe>`;
+}
+
+function isImage(url) {
+	const re = /\.(jpe?g|png|gif)$/;
+	const isImage = re.test(url);
+	return isImage;
+}
+
+function getImageForURL(url) {
+	return `<a target="_blank" href="${url}"><img class="embedded-image" src="${url}" width="100%" height="150px"/></a>`;
+}
+
+
+// Taken from https://stackoverflow.com/questions/3972014/get-contenteditable-caret-index-position
+export function getCaretPosition(editableDiv) {
+	var caretPos = 0,
+		sel, range;
+	if (window.getSelection) {
+		sel = window.getSelection();
+		if (sel.rangeCount) {
+			range = sel.getRangeAt(0);
+			if (range.commonAncestorContainer.parentNode == editableDiv) {
+				caretPos = range.endOffset;
+			}
+		}
+	} else if (document.selection && document.selection.createRange) {
+		range = document.selection.createRange();
+		if (range.parentElement() == editableDiv) {
+			var tempEl = document.createElement("span");
+			editableDiv.insertBefore(tempEl, editableDiv.firstChild);
+			var tempRange = range.duplicate();
+			tempRange.moveToElementText(tempEl);
+			tempRange.setEndPoint("EndToEnd", range);
+			caretPos = tempRange.text.length;
+		}
+	}
+	return caretPos;
+}
+
+// Pieced together from parts of https://stackoverflow.com/questions/6249095/how-to-set-caretcursor-position-in-contenteditable-element-div
+export function setCaretPosition(editableDiv, position) {
+	var range = document.createRange();
+	var sel = window.getSelection();
+	range.selectNode(editableDiv);
+	range.setStart(editableDiv.childNodes[0], position);
+	range.collapse(true);
+
+	sel.removeAllRanges();
+	sel.addRange(range);
+}