Add insert link button to the format bar

res/css/views/rooms/_MessageComposerFormatBar.scss

@@ -16,7 +16,7 @@ limitations under the License.
 
 .mx_MessageComposerFormatBar {
     display: none;
-    width: calc(32px * 5);
+    width: calc(32px * 6);
     height: 32px;
     position: absolute;
     cursor: pointer;
@@ -87,6 +87,11 @@ limitations under the License.
     .mx_MessageComposerFormatBar_buttonIconCode::after {
         mask-image: url('$(res)/img/element-icons/room/format-bar/code.svg');
     }
+
+    .mx_MessageComposerFormatBar_buttonIconInsertLink::after {
+        mask-image: url('$(res)/img/element-icons/link.svg');
+        mask-size: 18px;
+    }
 }
 
 .mx_MessageComposerFormatBar_buttonTooltip {

src/components/views/rooms/BasicMessageComposer.tsx

@@ -28,6 +28,7 @@ import {
     formatRangeAsCode,
     toggleInlineFormat,
     replaceRangeAndMoveCaret,
+    formatRangeAsLink,
 } from '../../../editor/operations';
 import { getCaretOffsetAndText, getRangeForSelection } from '../../../editor/dom';
 import Autocomplete, { generateCompletionDomId } from '../rooms/Autocomplete';
@@ -706,6 +707,9 @@ export default class BasicMessageEditor extends React.Component<IProps, IState>
             case Formatting.Quote:
                 formatRangeAsQuote(range);
                 break;
+            case Formatting.InsertLink:
+                formatRangeAsLink(range);
+                break;
         }
     };
 

src/components/views/rooms/MessageComposerFormatBar.tsx

@@ -27,6 +27,7 @@ export enum Formatting {
     Strikethrough = "strikethrough",
     Code = "code",
     Quote = "quote",
+    InsertLink = "insert_link",
 }
 
 interface IProps {
@@ -57,6 +58,7 @@ export default class MessageComposerFormatBar extends React.PureComponent<IProps
             <FormatButton label={_t("Strikethrough")} onClick={() => this.props.onAction(Formatting.Strikethrough)} icon="Strikethrough" visible={this.state.visible} />
             <FormatButton label={_t("Code block")} onClick={() => this.props.onAction(Formatting.Code)} icon="Code" visible={this.state.visible} />
             <FormatButton label={_t("Quote")} onClick={() => this.props.onAction(Formatting.Quote)} icon="Quote" shortcut={this.props.shortcuts.quote} visible={this.state.visible} />
+            <FormatButton label={_t("Insert link")} onClick={() => this.props.onAction(Formatting.InsertLink)} icon="InsertLink" visible={this.state.visible} />
         </div>);
     }
 

src/editor/operations.ts

@@ -32,13 +32,13 @@ export function replaceRangeAndExpandSelection(range: Range, newParts: Part[]):
     });
 }
 
-export function replaceRangeAndMoveCaret(range: Range, newParts: Part[]): void {
+export function replaceRangeAndMoveCaret(range: Range, newParts: Part[], offset = 0): void {
     const { model } = range;
     model.transform(() => {
         const oldLen = range.length;
         const addedLen = range.replace(newParts);
         const firstOffset = range.start.asOffset(model);
-        const lastOffset = firstOffset.add(oldLen + addedLen);
+        const lastOffset = firstOffset.add(oldLen + addedLen + offset);
         return lastOffset.asPosition(model);
     });
 }
@@ -103,6 +103,15 @@ export function formatRangeAsCode(range: Range): void {
     replaceRangeAndExpandSelection(range, parts);
 }
 
+export function formatRangeAsLink(range: Range) {
+    const { model, parts } = range;
+    const { partCreator } = model;
+    parts.unshift(partCreator.plain("["));
+    parts.push(partCreator.plain("]()"));
+    // We set offset to -1 here so that the caret lands between the brackets
+    replaceRangeAndMoveCaret(range, parts, -1);
+}
+
 // parts helper methods
 const isBlank = part => !part.text || !/\S/.test(part.text);
 const isNL = part => part.type === Type.Newline;

src/i18n/strings/en_EN.json

@@ -1606,6 +1606,7 @@
     "Strikethrough": "Strikethrough",
     "Code block": "Code block",
     "Quote": "Quote",
+    "Insert link": "Insert link",
     "Only the two of you are in this conversation, unless either of you invites anyone to join.": "Only the two of you are in this conversation, unless either of you invites anyone to join.",
     "This is the beginning of your direct message history with <displayName/>.": "This is the beginning of your direct message history with <displayName/>.",
     "Topic: %(topic)s (<a>edit</a>)": "Topic: %(topic)s (<a>edit</a>)",